Catalytic Experiments Research Articles

Design and development of a highly efficient reusable zeolite impregnated ZnAl2O4 catalyst for biodiesel production.

As the demand for sustainable energy sources expands, the production of biodiesel has attracted great attention. The development of effective and ecologically friendly biodiesel catalysts has become an urgent need. In this context, the goal of this study is to develop a composite solid catalyst with enhanced efficiency, reusability, and reduced environmental impact. For that, eco-friendly, and reusable composite solid catalysts have been designed by impregnating different amounts of zinc aluminate into a zeolite matrix (ZnAl2O4@Zeolite). Structural and morphological characterizations confirmed the successful impregnation of zinc aluminate into the zeolite porous structure. Catalytic experiments revealed that the catalyst containing 15 wt% ZnAl2O4 showed the highest conversion activity of fatty acid methyl esters (FAME) of 99% under optimized reaction conditions, including 8 wt% catalyst, a molar ratio of 10:1 methanol to oil, a temperature of 100 °C, and 3 h of reaction time. The developed catalyst demonstrated high thermal and chemical stability, maintaining good catalytic activity even after five cycles. Furthermore, the produced biodiesel quality assessment has demonstrated good properties in compliance with the criteria of the American Society for Testing and Materials ASTM-D6751 and the European Standard EN14214. Overall, the findings of this study could have a significant impact on the commercial production of biodiesel by offering an efficient and environmentally friendly reusable catalyst, ultimately reducing the cost of biodiesel production.

Catalytic valorization of glycerol in the absence of external hydrogen: Effect of the Cu/ZrO2 catalyst mass and solvent

The glycerol valorization by heterogeneous catalysis to produce high-value-added chemicals is mainly carried out in the presence of high pressures of molecular hydrogen, a highly flammable gas whose main production in our days depends on fossil fuels. Therefore, an attractive alternative to explore is hydrogen in-situ generation in the catalytic process. Herein, we investigated the liquid-phase catalytic valorization of 80% wt. glycerol in different solvents such as water, 2-propanol, and acetone using a Cu/ZrO2 catalyst in the absence of external hydrogen. Firstly, the mass effect of the Cu/ZrO2 in the glycerol aqueous medium was evaluated finding an optimum mass of 250 mg for glycerol conversion. At these conditions, an initial reaction rate value of 2.63 × 10−3 molgly·gcat−1·min−1 was observed while the main products were hydroxyacetone (HA) and 1,2-propanediol (1,2-PDO). The use of 2-propanol as solvent and hydrogen donor molecule in the glycerol conversion induced the hydrogenation of hydroxyacetone towards 1,2-PDO. The ratio between the selectivity of 1,2-PDO/HA was found to be higher than that observed for the catalytic experiment with water. For the conversion of glycerol in the presence of acetone as a solvent it was noted the occurrence of acetalization reaction of glycerol with acetone and the main product observed was 4-hydroxymethyl-2,2-dimethyl-1,3-dioxalane or solketal. Density functional theory (DFT) calculations were included to gain insight into the reaction mechanisms of the hydroxyacetone hydrogenation to the formation of 1,2-PDO on Cu/ZrO2 catalyst. Four possible pathways were considered. The elementary steps include several intramolecular hydrogen atom transfer steps and two hydrogen addition steps. The hydrogen sources would come from adsorbed hydroxyl species of the aqueous reaction medium on ZrO2 support.

Production of hydroxytyrosol through whole-cell bioconversion from L-DOPA using engineered Escherichia coli

Hydroxytyrosol (HT), a polyphenolic molecule of high value, is used in the nutraceutical, cosmetic, food, and livestock nutrition industries. As a natural product, HT is chemically manufactured or extracted from olives; nevertheless, the increasing demand mandates the exploration and development of alternative sources, such as heterologous production by recombinant bacteria. In order to achieve this purpose, we have molecularly modified Escherichia coli to carry two plasmids. For conversion of L-DOPA (Levodopa) into HT efficiently, it is necessary to enhance the expression of DODC (DOPA decarboxylase), ADH (alcohol dehydrogenases), MAO (Monoamine oxidase) and GDH (glucose dehydrogenases). The step that significantly affects the rate of ht biosynthesis is likely to be associated with the reaction facilitated by DODC enzymatic activity, as suggested by the result of in vitro catalytic experiment and HPLC. Then Pseudomonas putida, Sus scrofa, Homo sapiens and Levilactobacillus brevis DODC were taken into comparsion. The DODC from H. sapiens is superior to that of P. putida, S. scrofa or L. brevis for HT production. Seven promoters were introduced to increase the expression levels of catalase (CAT) to remove the byproduct H2O2 and optimized coexpression strains were obtained after screening. After the 10-hour operation, the optimized whole-cell biocatalyst produced HT at a maximum titer of 4.84 g/L with over 77.5% molar substrate conversion rate.

Efficient Construction of MXene/V2O5 Nanocomposites for Optimizing the Combustion of Ammonium Perchlorate-Based Composite Solid Propellants.

The combustion performance of composite solid propellants (CSPs) significantly affects their application in the field of military and civil aircraft. Ammonium perchlorate/hydroxyl-terminated polybutadiene (AP/HTPB) composite propellants are one of the common CSPs, and their combustion performance is mainly affected by AP thermal decomposition. In this work, a simple strategy was put forward to effectively construct MXene-supported vanadium pentoxide nanocomposites (MXene/V2O5, MXV). MXene provided a good loading interface for V2O5 nanoparticles, which made MXV obtain a large specific surface area and simultaneously improved the catalytic performance of MXV for AP thermal decomposition. The catalytic experiment results showed that the decomposition temperature of AP mixed with MXV (MXV-4, 2.0 wt %) was 83.4 °C lower than that of pure AP. Moreover, the ignition delay of the AP/HTPB propellant was significantly reduced by 80.4% after adding MXV-4. The burning rate of the propellant was also increased by 202% under the catalytic action of MXV-4. Based on the above results, MXV-4 was expected to be an additive for optimizing the burning process of AP-based composite solid propellants.

Crucial Role of Surface FeOx Components on Supported Fe-Based Nanocatalysts for CO2 Hydrogenation to Light Olefins

Currently, Fe-based catalysts show excellent catalytic performance in the hydrogenation of CO2 to produce light olefins. Despite numerous studies, the identification of the role of catalytically active components over Fe-based catalysts for CO2 hydrogenation is not quite clear. In this work, a series of ZrO2-supported cobalt-doped Fe-based catalysts were fabricated by a microliquid film reactor-assisted coprecipitation method. It was demonstrated that appropriately strong interactions between Fe-containing species and the ZrO2 support in catalyst precursors could facilitate the generation of a defective FeOx component upon reduction treatment and inhibit the carburization of metallic iron during the reaction. Among all Fe-based catalysts, the catalyst bearing a (Co + Fe)/ZrO2 mass ratio of 3:7 and a Co/Fe molar ratio of 1:9 achieved a highest light olefins selectivity of about 38% at 49% CO2 conversion under reaction conditions (i.e., 320 °C, 2.0 MPa, and 4800 mL·gcat–1·h–1), along with a high Fe time yield to light olefins of 9.2 μmolCO2·gFe–1·s–1 and a low CO selectivity of 4.7%. Comprehensive structural characterization and catalytic CO2 hydrogenation experiments clarified that the surface-dominant defect-rich FeOx component as catalytically active species substantially played a crucial role in governing the hydrogenation of CO2, mainly owing to their enhanced adsorption and binding ability for CO2 and the CO intermediate. This study offers a new strategy to design Fe-based catalysts and provides deep insight into the role of iron oxide species for CO2 hydrogenation to produce light olefins.

Kinetics study on the catalytic recombination of non-premixed hydrogen–oxygen system: Effects of initial temperature, oxygen flow rate, and hydrogen diffusion time

Hydrogen-oxygen catalytic recombination reaction, as a promising technology for hydrogen elimination in the confined environment, can spontaneously eliminate the leaking hydrogen in the environment. However, the kinetics characteristics of this reaction process under different environmental factors have been poorly reported. A series of hydrogen–oxygen catalytic recombination experiments are performed in a little cylindrical container using Platinum-Carbon powder as the catalyst, to investigate the effects of the initial temperature, oxygen flow rate, and hydrogen diffusion time on the temperature characteristics. In addition, the amount of residual hydrogen at the end of the reaction is also taken into account. The results show that the reaction intensity increases with the increase of the initial temperature, and the first temperature peak PT1 is gradually smaller than PT2 and finally disappears. However, the intensity of temperature increase caused by the reaction exotherm does not enhance continuously with the increase of the reaction intensity. With the decrease in oxygen flow rate, the reaction temperature gradually reduces and the temperature peak gradually forms before the end of oxygen inflow. Nevertheless, the direction of temperature transfer is hardly affected by the oxygen flow rate and the heat is still accumulating below the catalyst. The effect of hydrogen diffusion time on the reaction at hydrogen-poor, stoichiometric ratio hydrogen, and hydrogen-rich is diverse and complex, but the temperature–time profile on the catalyst surface has been changed accordingly. In addition, under any conditions, the hydrogen can be completely reacted below the stoichiometric ratio.

Fluorescent Groups at the Core of Phosphorus Dendrons and Their Properties

AbstractThis review presents the synthesis of dendrons (dendritic wedges) based on cyclotriphosphazene cores, in which one function is a fluorescent group, and the five remaining functions are used for growing the dendritic branches. The growing of the branches is carried out by a divergent method, using a two‐step process which implies hydroxybenzaldehyde and the phosphorhydrazide H2NNMeP(S)Cl2. Four different fluorophores have been used, derived from maleimide, julolidine, pyrene, or from a near‐infra‐red fluorophore. Depending on the type of fluorophore and on the type of terminal functions of the dendrons, different applications have been targeted. One can cite experiments in catalysis or for the elaboration of materials, transfection experiments, the study of anti‐cancer properties, and imaging in relation with the human immune system.

Synergy of Single Atoms and Lewis Acid Sites for Efficient and Selective Lignin Disassembly into Monolignol Derivatives.

Lignin is the most abundant aromatic polymer from the natural and renewable lignocellulosic biomass resource. Developing highly efficient catalysts for lignin depolymerization to produce valuable monophenols with high yield and selectivity remains a desirable but challenging target in this field. Here, we design a synergistic catalyst combining atomically dispersed Mo centers and Al Lewis acid sites on a MgO substrate (Mo1Al/MgO) for the depolymerization of Eucalyptus lignin via the β-aryl ether bond cleavage. A near-theoretical monophenol yield of 46% with an ultrahigh selectivity of 92% for coniferyl and sinapyl methyl ether, as well as good cycling durability, was achieved simultaneously by Mo1Al/MgO in an inert N2 atmosphere. First-principles calculations and control catalytic experiments confirmed the synergistic catalysis mechanism between Mo1-O5 single-atom centers and the neighboring Al Lewis acid sites with the participation of a methanol solvent. This study validates the feasibility of designing better-performing catalysts with synergistic multiactive sites for the efficient and selective disassembly of complex renewable biopolymers into highly value-added products with lower cost and greater security.

Efficient activation of peroxymonosulfate-based Fenton-like system using CuCo2O4/g-C3N4 prepared by Cu+-Co2+ self-doped: g-C3N4 driven reduction-oxidation cycling mechanism of Cu and Co metals

A large specific surface area Cu+-Co2+ self-doped CuCo2O4/g-C3N4 composite was synthesized in situ by a simple hydrothermal combined calcination method. This material is a kind of highly active catalyst suitable for peroxymonosulfate (PMS)-based Fenton-like system, with strong resistance to impurity ions interference, universality to pollutants, and good recyclability. Through XRD (X-ray diffraction), FTIR (Fourier transform infrared spectrometer), XPS (X-ray photoelectron spectrum), TEM (transmission electron microscopy) and catalytic experiments, it can be seen that CuCo2O4 nanoparticles with diameter of 6–9 nm are uniformly distributed on the surface of g-C3N4 to form CuCo2O4/g-C3N4. At room temperature, PMS-based Fenton-like system catalyzed by CuCo2O4/g-C3N4 could degraded tetracycline (TC) to 85.8% in 8 min. The mechanism of CuCo2O4/g-C3N4 activating PMS was discussed in detail. The results show that the surface electron transfer ability of C in g-C3N4 can promote the efficient reduction-oxidation (REDOX) cycle of Cu+/Cu2+ and Co2+/Co3+ on the catalyst surface, thus provide a continuous impetus for the activation of PMS.

Triboelectrification Catalytic Degradation of Organic Pollutants in Water Environment

With the rapid development of industrialization, more and more organic pollutants are entering the water environment, rendering the treatment of organic pollutants a key issue in protecting it. Therefore, finding a convenient and effective method for degrading organic pollutants in water is of great importance. Triboelectrification is known as the process of charge transfer during the friction process. It is always accompanied by the energy level transition of electrons or holes, making it a potential method for catalytic degradation, which we refer to as triboelectrification catalysis. In this study, a set of experimental equipment was developed. The device is composed of a mechanical system, a control system, and a measurement system that can realize the quantitative measurement of the triboelectrification catalysis under different friction pairs, different loads, and different contact frequencies. Using the developed device, we observed stable triboelectrification catalytic degradation. This study performed triboelectrification catalytic experiments on various organic compounds including methyl orange, rhodamine, and tetracycline. The results revealed that these three organic compounds were degraded by 39%, 15%, and 20%, respectively, within three hours of being under the influence of triboelectrification catalysis. Subsequently, this study conducted triboelectrification catalytic experiments using materials with different triboelectric capacities. This study found that the triboelectric capacity significantly impacted the triboelectrification catalytic degradation rate, providing further evidence for the mechanism of triboelectrification catalysis. Additionally, this study found that SiO2 and Al2O3, which also utilize electrons as the primary carrier for triboelectrification, are capable of catalyzing the degradation of a methyl orange solution. Therefore, this study suggests that the triboelectrification catalysis is a versatile and widely applicable method for treating organic pollutants in water. With a broad range of catalyst sources and the ability to effectively degrade various organic pollutants, it shows promise as a solution for the problem of water pollution.

Acetic acid mediated fabrication of highly exposed Fe(III)/Fe(II) sites in Fe2O3/MA for enhanced peroxymonosulfate activation

The design and synthesis of efficient heterogeneous catalysts with the accessible and mixed-valence metal centers for the activation of peroxymonosulfate (PMS) is an important research topic in water pollution control. In this work, the highly efficient catalysts Fe2O3/MA have been successfully synthesized with acetate acid as an important regulating agent. Methylene blue (MB) has been applied as the organic pollution for catalysis experiments and Fe2O3/MA-1.5 can achieve 98% catalytic degradation of MB at a concentration of 10 mg/L in 100 min, showing much higher catalytic efficiency than those of single MA (acetate modified MIL-53(Fe)) (60%) and Fe2O3 (57%). Electron paramagnetic resonance (EPR) spectroscopy and radical scavenging experiments have shown that hydroxyl radical (•OH), sulfate radical (•SO4ˉ), and singlet oxygen (1O2) all participate and contribute to the degradation process. The efficient catalytic mechanisms have been carefully studied. X-ray diffraction (XRD), X-ray photoelectron spectra (XPS) and pyridine Fourier transformed infrared (py-FT-IR) have successfully proved the construction of highly exposed coordinatively unsaturated sites and the coexistence of Fe(III)/Fe(II) double catalytic centers in Fe2O3/MA-1.5, which function together with the high dispersion of Fe2O3 on MA to realize the final high activation activity for PMS. Further research shows that the initial coordination of acetic acid with Fe sites and the departure of acetic acid after vacuum treatment help construct highly exposed Fe(III)/Fe(II) double catalytic sites in Fe2O3/MA-1.5. Eventually, the intermediates produced in the reaction were analyzed by gas chromatography mass spectrometry (GC-MS), and the degradation pathway has been tentatively proposed. This study has proposed a new route to build active sites in catalysis, which shows high application potential for the effective degradation of organic pollutants in water.

Acetone–Butanol–Ethanol Catalytic Upgrading into Aromatics over Ga-Modified HZSM-5 Zeolites

The selective conversion of the acetone–butanol–ethanol (ABE) mixture derived from biomass to high-valuable chemicals has attracted intensive attention, while controlling the product selectivity at high ABE conversions is still a challenge. Herein, a bifunctional Ga/HZSM-5 zeolite containing both Brønsted acid sites and Lewis acid sites was designed and utilized as a robust catalyst for the conversion of the ABE mixture to aromatics with a state-of-the-art aromatics yield of 77%. The reaction mechanisms including the aromatics formation and catalyst deactivation were investigated through the catalytic modulation experiments with monocomponents and bicomponents of the ABE mixture and several complementary spectroscopic approaches. A synergistic catalysis between the Lewis acidic Ga species and Brønsted acid sites was proposed, and the structure–activity relationship was established. These results provide some fundamental guidelines to rationally design highly efficient catalysts for the selective catalytic conversion of ABE fermentation.

Cu-Mn doped beta zeolite catalyst was easily prepared for efficient total oxidation of propane

In this paper, CuMn doped catalysts were prepared by using SiO2, γ-Al2O3 and Beta molecular sieve as carriers, and propane catalytic degradation experiments were carried out. The modified H-Cu-Mn-Beta molecular sieve catalyst has large pore size, smooth surface, good adsorption performance and the best catalytic degradation effect on propane. The optimum process conditions were obtained by single factor test: Cu: Mn = 2:1, pickling temperature 50 °C, microwave calcination temperature 500 °C, holding time 40 min. The catalyst prepared under this condition has high catalytic activity. When the temperature was 500 °C, the degradation rate remained above 82.7% within 36 h.

Effect of RGO-MoS2/MnO2 nanocomposites with high catalytic activity on the combustion of AP/HTPB composite propellant

A novel RGO-MoS2/MnO2 (RSM) nanocomposite catalyst was effectively constructed by in situ hydrothermal method. RSM nanocomposite was constructed by using RGO-MoS2 composite as a substrate and in situ MnO2 as a catalytic core. Various characterization tests were used to prove the successful preparation of RSM nanocomposite and the results showed that RSM-3 exhibited a network-loaded nanoparticle structure with lots of active sites. During catalytic and combustion experiments, RSM-3 showed significant catalysis for AP decomposition. The catalytic experiment results showed that RSM-3 (2.0 wt%) could highly decrease AP decomposition temperature to about 327.8 ºC and enhance the heat release to 1530.4 J‧g−1. RSM-3 (2.0 wt%) dramatically decreased the Ea of HD stage by 112.7 kJ·mol−1. It also shortened the ignition delay time of AP/HTPB propellants by 61.8% and increased the mass burning rate by 148%. Excellent catalytic performance of RSM-3 might be owing to the synergy of metal-carbon structure of RGO-MoS2 and MnO2 nanoparticles. This work provides a new direction for the synthesis of novel catalyst materials with high catalytic activity.

Ferrocene-based catalysts for in-situ hydrothermal upgrading of heavy crude oil: Synthesis and application

In this work, the effect of synthesized Ferrocene-based ligand catalysts, including Mono-, Di- and Tri-Ferrocene, as additives for promoting the catalytic in-situ hydrothermal upgrading of Tatarstan (Russia) heavy crude oil was studied. In addition, the changes in composition of upgraded oil samples as well as the in-situ transformation and characteristics of used catalysts were evaluated in detail using comprehensive analyzing techniques. All of the catalytic and non-catalytic hydrothermal upgrading experiments were carried out under the steam stimulation conditions at 300 °C, 72 bar (1044.27 psi) and 24 h of reaction time. The results show that introducing Ferrocene-based ligand catalysts to the upgrading system promotes the in-situ upgrading of heavy crude oil and improves the physical and chemical properties of upgraded oil samples. The maximum viscosity reduction was observed in presence Tri-Ferrocene and reached around 40% compared to non-catalytic hydrothermal upgrading. In addition, the upgrading performance also reflects in increase of H/C ratio, reduction of sulfur content, increase of saturates and aromatics, and decrease of the content of resins and asphaltenes as well as a noticeable change (increase) in the light fractions of C10-C20 are observed for all upgraded oil samples. Mono-Ferrocene as an oil-soluble catalyst mainly transformed to the particles of Fe3O4 (Magnetite) and FeS, which can act as active forms of catalysts and accelerate the hydrothermal conversion of heavy crude oil and its heavy fractions including resins and asphaltenes. These transformations were confirmed using XRD, SEM-EDX and Mössbauer analyzing techniques. Generally, the good catalytic performance of used ferrocene-based ligand catalysts as well as their low cost and commercial availability makes them great potential catalysts for improving the efficiency of steam injection for heavy oil production and in-situ upgrading.

Testing conditions for CoMo HDS catalyst in the kinetic region: integrated approach using the math calculations and catalytic experiments

The main idea of the investigation was to define testing parameters with the lowest influence of internal and external diffusion on catalytic activity in hydrodesulfurization of dibenzothiophene. Traditional experimental methods were used to determine the conditions for the influence of internal and external diffusion. Simultaneous change of a linear feedstock rate and a catalyst loading at constant weight hour space velocity were used to determine the process temperature (240–260 °C) at which the impact of external diffusion is minimal. Catalytic tests, including the variation of the catalyst fraction size, were carried out to define the conditions with the lowest influence of internal diffusion. It was found that when the catalyst with the fraction size of 0.1–0.25 mm was used, the fluctuation of sulfur conversion was the smallest. Besides, to validate experimental results, the calculations were performed with mass balance equations and expressions used for HDS modeling. The resulting data and catalytic experiments demonstrated that the lowest influence of internal and external diffusion is achieved at a temperature process less than 260 °C and a catalyst fraction of 0.1–0.25 mm.

A molecular kinetic model for heavy gas oil catalytic pyrolysis to light olefins

AbstractPetroleum catalytic pyrolysis to light olefin technology has received wide‐ranging research interest in the refining industry. This work built a molecular kinetic model for the catalytic pyrolysis of a heavy gas oil from bitumen synthetic crude oil (SCO) to light olefins. A feedstock compositional model was constructed containing 1311 molecules using bulk properties information. A variety of reaction rules was summarized and digitized, and from which, a reaction network involving 2631 substances and 6793 reactions was generated via a reaction network autogeneration algorithm. The reaction network for the catalytic pyrolysis was transformed into reaction rate equations. Systematical pilot‐scale catalytic pyrolysis experiments were carried out, which were used to regress the molecular kinetic model parameters. The tuned model is able to predict the product yield and molecular distribution. Moreover, a range of sensitivity analysis was performed, revealing the dependence of light olefins yields on the reaction conditions.

Modulation the metal-support interactions of potassium molybdenum-based catalysts for tuned catalytic performance of synthesizing CH3SH

Modulation of the metal-support interactions (MSI) is an effective means to improve the performance of supported catalysts, but the role of the metal-support effect in the synthesis of CH3SH from CO/H2/H2S mixtures has not been recognized. Here, three different interactions, namely weak MSI, strong MSI and electronic MSI are constructed over K-promoted MoS2-base catalysts and investigated for the synthesis of CH3SH. The catalytic activity experiments show that the K-Mo catalyst with strong MSI has the highest formation rate toward CH3SH, while the K-Mo catalyst with electronic MSI instead shows the worst formation rate toward CH3SH. The characterizations suggest that the strong MSI facilitates the enhancement of Mo-S bond strength and the production of few layers, shorter slab and ordered K-MoS2 particles. The former benefits the formation and stabilization of C-S intermediate species and subsequent hydrogenation to CH3SH, while the latter promotes the generation of more Mo-coordinatively unsaturated sites (Mo-CUS) and thus facilitates the first-step adsorption and activation of reactants. In contrast, electronic MSI weakens the strength of the Mo-S bond, which inhibits the generation of C-S intermediate species. On the other hand, the presence of electronic MSI leads to the generation of Mo-Ov-Ti interfacial sites, which is favorable for the hydrogenolysis of CH3SH to CH4. This work provides an insight into the construction and selection of metal-support interactions for heterogeneous catalysis.

Catalysis of Minerals in Pyrolysis Experiments

Recent research in the field of oil and gas geochemistry has focused on the catalytic role of minerals in geological history. Thermal simulation experiments are considered a valuable means of studying the formation and transformation of hydrocarbons. In this paper, we review the catalytic mechanisms, processes, and various arguments for different types of minerals in thermal simulation experiments from the perspective of mineral additives. We focus on two categories: (1) minerals that provide direct catalysis, such as clay minerals, alkali metals, carbonate rocks, and some transition metal elements, and (2) minerals, such as serpentine, that promote aqueous hydrogen and act as the material basis, as well as the radioactive element uranium. We also discuss existing disputes and prospects for the development direction of mineral catalytic thermal simulation experiments.

LaMnxCo1‐xO3 (x=0, 0.25) Perovskites: Novel Nano Catalysts for Removal of Thiophene compounds in Fuels by Catalytic and Ultrasound‐assisted Oxidative Desulfurization

AbstractLaMnxCo1‐xO3 (x=0, 0.25) perovskites were developed as novel nanocatalysts for the desulfurization of thiophenes compounds by catalytic oxidative desulfurization (CODS) and ultrasound‐assisted oxidative desulfurization (UAOD). The perovskites were synthesized by the sol‐gel auto‐combustion method and characterized by X‐ray diffraction (XRD), temperature programmed reduction (TPR), Scanning electron microscopy (SEM) and BET surface area. The experiments were designed by the Box‐Behnken method of response surface methodology. The catalytic experiments were designed by response surface methodology (RSM). LaMn0.25Co0.75O3 despite having a lower surface area rather than LaCoO3 exhibited superior activity due to easy reducibility and high surface electron density approved by TPR. Pareto analysis indicated that the DBT concentration had the most effect on the CODS process. Ultrasound waves enhanced the activity of the catalysts via the formation of hot spots as an accelerating and de‐agglomerating agent in the UAOD process, leading the LaMn0.25Co0.75O3 to be reusable at least for 5 cycles. A mechanism for DBT oxidation was proposed by the formation of DBT sulfone. Due to steric hindrance and the electron density of the sulfur atoms in thiophene derivatives, the following order resulted in their desulfurization rate: DBT>4‐MDBT>BT. The study indicated that perovskites could be novel and promising nanocatalysts for the desulfurization of fuels.