Weak Acid Centers Research Articles

Encapsulation of Imidazole into Ce-Modified Mesoporous KIT-6 for High Anhydrous Proton Conductivity.

Imidazole molecules entrapped in porous materials can exhibit high and stable proton conductivity suitable for elevated temperature (>373 K) fuel cell applications. In this study, new anhydrous proton conductors based on imidazole and mesoporous KIT-6 were prepared. To explore the impact of the acidic nature of the porous matrix on proton conduction, a series of KIT-6 materials with varying Si/Al ratios and pure silica materials were synthesized. These materials were additionally modified with cerium atoms to enhance their Brønsted acidity. TPD-NH3 and esterification model reaction confirmed that incorporating aluminum into the silica framework and subsequent modification with cerium atoms generated additional acidic sites. UV-Vis and XPS identified the presence of Ce3+ and Ce4+ in the KIT-6 materials, indicating that high-temperature treatment after cerium introduction may lead to partial cerium incorporation into the framework. EIS studies demonstrated that dispersing imidazole within the KIT-6 matrices resulted in composites showing high proton conductivity over a wide temperature range (300-393 K). The presence of weak acidic centers, particularly Brønsted sites, was found to be beneficial for achieving high conductivity. Cerium-modified composites exhibited conductivity surpassing that of molten imidazole, with the highest conductivity (1.13 × 10-3 S/cm at 393 K) recorded under anhydrous conditions for Ce-KIT-6. Furthermore, all tested composites maintained high stability over multiple heating and cooling cycles.

PRODUCTION OF DIISOPROPYL ETHER IN THE PRESENCE OF MODIFIED HETEROPOLYACID CATALYSTS CONTAINING TITANIUM OXIDE

The catalytic activity of titanium dioxide and its analogs modified with formoformolybdenum heteropoly acid was studied in the conversion of isopropyl alcohol. It was found that adding 10% phosphoformolybdenum heteropoly acid to titanium dioxide increased the catalyst's stability and its selectivity for diisopropyl ether by more than 1.5 times. It is suggested that the formation of diisopropyl ether in the presence of unmodified titanium dioxide occurs via the fusion mechanism, while in the presence of modified titanium dioxide, it occurs via the shock mechanism. The change in the mechanism of diisopropyl ether formation is associated with a shift in the distribution of acid-base active centers: before modification, strong and weak Lewis acid centers and Bronsted base centers are present on the surface of titanium dioxide, and the introduction of the modifier blocks strong Bronsted base centers, forming a new type—Bronsted basic centers composed of oxygen atoms. Keywords: isopropyl alcohol, catalytic properties, phospho-libdeno heteropoly acid, fusion mechanism, shock mechanism.

Highly efficient MnOx catalysts supported on Mg-Al spinel for low temperature NH3-SCR

Selective catalytic reduction (SCR) has been extensively employed in industries for the removal of NOx while it is still a challenge to develop novel low-temperature catalysts. The redox and acid sites on the catalyst are often preconditions that cooperate in the SCR reaction. In this study, a series of MnOx supported on MgAl2O4 spinel catalysts (denoted as Mn/MAS) were successfully prepared by incipient wetness impregnation method for low-temperature SCR of NOx with ammonia. The effects of the calcination temperature of MAS support and Mn loading on catalyst structure and performance were examined. The Mn0.12/MAS-700 catalyst showed the best low-temperature denitrification performance, with more than 80% conversion of NO at 150–300 °C and higher than 60% N2 selectivity. Moreover, the denitrification efficiency remained at nearly 90% in the presence of H2O. The physicochemical properties of the catalysts were determined using various characterization methods, and the corresponding results found that the higher concentration of Mn4+ and surface chemisorption oxygen enhanced the low-temperature activity of the catalysts. The addition of Mn species increased the surface acidity of weak acid centers which promoted the catalyst activity. In situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) revealed that the Eley-Rideal mechanism was introduced mainly at 100 °C on the Mn0.12/MAS-700 catalyst. This work provides new inspiration into the effect of Mn species, and the synergistic role of active components Mn and MAS support in the SCR reaction.

Facile fabrication of superior Pd and Ce containing SiO2 aerogel composite adsorbents for deep desulfurization of model fuels and aromatics

A series of PdO/CeO2/SiO2-z aerogel composites with different molar ratio of Si/Ce were facilely fabricated via sol-gel method combined with atmospheric drying technology, where a major of Ce3+ species could be oxidized to Ce4+ species by adding hydrogen peroxide. They were used to remove thiophenics from model fuels and aromatics, compared with PdO/SiO2 and CeO2/SiO2 aerogel composites. Adding Ce and Pd led to an appearance of weak Lewis acid centers on the surface of adsorbents. Compared with PdO/SiO2 and CeO2/SiO2, the adsorption capacity of PdO/CeO2/SiO2-z significantly increased, in which PdO/CeO2/SiO2-100 performed best and the adsorption capacity for thiophene was 15.0 mg-S/gads, which was about the sum of PdO/SiO2-636 and CeO2/SiO2-100. The case was attributed to π-complexation of Pd2+ and S-M (Pd, Ce, acted as Lewis acid centers) bond (σ) with thiophenics, where the adsorption process was dominated by S–Ce bond. Combined with the same chemical state of Pd and Ce in single metal and bimetal adsorbents verified by XPS, it can be deduced that no synergistic interaction between Pd and Ce species was formed in the adsorption process. PdO/CeO2/SiO2-100 exhibited a higher resistance for competitive adsorption of aromatics and a good solvent washing regeneration performance. The adsorption process of PdO/CeO2/SiO2-100 for thiophene was well fitted by Langmuir isothermal and pseudo-secound-order model and were spontaneous and endothermic. The solvents (n-heptane, benzene and p-xylene) have no obvious effect on the adsorption thermodynamics and kinetics of PdO/CeO2/SiO2-100.

A comparative study on the catalytic activities of the SrTiO3 perovskite and oxide CuO-ZnO mixed oxides for the oxidative coupling of methane

In this study, SrTiO3 catalyst was prepared by sol-gel method and CuO-ZnO by co-precipitation for oxidative coupling of methane (OCM). The results showed that the conversion rate in the SrTiO3 sample was high (about 35%) at 850 oC, and the product C2H4 with an yield of 0.12%. Several modern analytical methods such as XRD, BET, TPx, SEM have been characterized. The XRD results showed a stable phase structure and high crystallinity with both samples. NH3-TPD recorded weak acid centers on SrTiO3, leading to coke formation on the impact surface. H2-TPR and O2-TPD express the redox of CuO-ZnO, resulting in a deep oxidation product of CO2. Factors affecting the ratio of C2H6 and C2H4 were also considered.

Titanium-Doped Mesoporous Silica with High Hydrothermal Stability for Catalytic Cracking Performance of Heavy Oil

With the increasing attention to light oil, the catalytic cracking process of heavy oil is being vigorously developed. The silicon hydroxyl groups on the surface of mesoporous silica materials can be used as weak acid centers to preliminarily crack heavy oil macromolecules. Herein, a strategy of introducing titanium into a silica skeleton for modification is proposed to increase active sites, as well as improve the hydrothermal stability. After titanium modification, the mesoporous silica material has more weak acid sites, and shows better ability in deep cracking heavy oil. Notably, when the content of titanium doping is 2%, the CT(2) catalyst exhibited the best high-temperature hydrothermal stability, which can be used as a suitable heavy oil catalytic cracking catalyst. This kind of titanium-modified mesoporous silica material shows great application prospects in heavy oil catalytic cracking, which may provide a novel idea for subsequent development.

The Use of WO3-ZSM-5 Zeolites in the Dehydration of Monosaccharides

In this work, a procedure was developed for the synthesis of WO3-containing catalysts based on zeolites of the ZSM-5 type. Zeolites with different Si/Al ratios and different numbers of acid sites were used: ZSM-5-CVM, ZSM-5-CVN and ZSM-5-Acros. The synthesized catalysts were characterized and tested in the reaction of the conversion of fructose and glucose to 5-hydroxymethylfurfural (5-HMF) and levulinic acid (LA). It was shown that the introduction of tungsten (VI) oxide into the composition of ZSM-5 leads to a noticeable increase in the number of active acid sites on the catalyst surface, which plays an important role in the reaction. In particular, the total concentration of weak and strong Bronsted acid centres for ZSM-5-Acros was 0.057 mmol/g; after the modification of zeolite WO3, the concentration of acid sites increased to 0.575 mmol/g. As a result, the activity of the catalysts in the reaction of dehydration of monosaccharides and rehydration of 5-HMF increased sharply. The results of the study show the promise of using zeolites of the ZSM-5 type, modified with tungsten oxide (VI), in the conversion of biomass to platform chemicals.

A facile fabrication of highly dispersed CeO2/SiO2 aerogel composites with high adsorption desulfurization performance

A simple, low energy consumption and environment-friendly strategy was used to prepare highly dispersed CeO2/SiO2 aerogel composites with different molar ratio of Si/Ce via sol-gel method and subsequently drying under the ambient pressure, in which the oxidation of Ce3+ species into Ce4+ species could be achieved by adding H2O2. The structural and surface properties of adsorbents were analyzed by XPS, XRD, FT-IR, Py-IR, SEM, XRF and N2 adsorption-desorption isotherm. The adsorption desulfurization performances of CeO2/SiO2 for thiophenic compounds from simulated gasoline and model aromatic products were investigated and compared by the breakthrough and batch adsorption experiments. As a result, the weak Lewis acid centers appeared on the surface of CeO2/SiO2. Among them, CeO2/SiO2 with a Si/Ce of 25 performed best, the adsd by Duanpacity for TP from simulated gasoline (n-heptane) was 10.9 mg-S/gads, followed by model aromatic products (benzene, 10.6 mg-S/gads; p-xylene, 10.1 mg-S/gads), however, the difference between them was slight, attributed to the formation of S-Ce bonding instead of C-Ce bonding. The very weak competitive adsorption of benzene and p-xylene with thiophene originated from the weak Lewis acid-base interaction. After the fourth solvent washing regeneration, the breakthrough adsorption capacity of regenerated CeO2/SiO2-25 still remained 60% of the fresh one. The equilibrium adsorption data of CeO2/SiO2-25 for thiophene were well fitted by Langmuir and Freundlich model, and the adsorption for TP was more favorable at the higher temperature. The adsorption process of CeO2/SiO2-25 was well fitted by pseudo-second-order kinetic model, which was spontaneous, endothermic and the freedom degree increased. The solvent (n-heptane, benzene, p-xylene) hardly influence the adsorption behavior of TP on CeO2/SiO2.

INFLUENCE OF THE NATURE OF TRANSITION METAL ON ACID-BASE PROPERTIES OF THE SURFACE AND ACTIVITY OF CATALYSTS BASED ON NATURAL CLINOPTILOLITE IN THE REACTION OF BIOGAS CONVERSION TO SYNTHESIS GAS

Catalysts based on natural clinoptilolite modified by transition metals (Ni, Co, Cr, Mo, Fe) were studied in the reaction of biogas conversion to synthesis gas. A particular attention is paid to exposing of relationship between acid-base properties surface – activity. This was achieved by studying the effect of the introduced transition metal nature on the acid-base spectrum and comparing the data obtained with sample activity. The highest activity and selectivity of the nickel sample has been established, that makes it possible to achieve complete methane conversion at 7000C to obtain synthesis gas with the ratio H2/CO = 1. It has been shown that the increased catalytic activity of the nickel sample is provided by an optimal combination of acid-base properties of the surface. It was found that the nickel sample is characterized by the presence of weak acid (electron-acceptor) centers with ionizing force of 9.69±0.01 eV, medium-acid (proton-donor) centers with ionizing force of 10.59±0.01 eV, and weak basic centers capable of ionizing a particle with dissociation constant of 9.89±0.01 that distinguish it from other samples

EFFECT OF PHYSICOCHEMICAL PROPERTIES OF d-METAL OXIDES ON SUNFLOWER OIL TRANSESTERIFICATION

The physicochemical indicators of d-metal oxides (NiO, CuO, MnO, FeO, PbO, ZnO) which are heterogeneous catalysts for the transesterification process of sunflower oil triglycerides by ethanol and butan-1-ol have been determined. The available specific surface area, surface acidity and basicity, as well as the hydrogen potential change of the catalyst suspension in water were determined for the oxides. The available specific surface area of the oxides was determined by titration of their aqueous suspension with a solution of methylene blue with a predetermined concentration. The surface acidity and basicity of the catalysts were determined by back titration of samples treated with an aqueous solution of ammonia and acetic acid, respectively. It was found that all investigated d-metal oxides have a low specific surface area. The value of specific surface area is in the range of 0.6-1.5 m2/g. The surface acidity and basicity of the catalysts is 0.13-0.27 mmol/g and 0.019-0.066 mmol/g, respectively. It is shown that the change in the aqueous suspension hydrogen potential of the investigated catalysts relative to the distilled water pH is maximum for NiO and ZnO and it is 0.6-0.65, while for CuO this change is the smallest and it is only 0.3. The character of the pH change curves and the pH values of the oxides suspension in equilibrium condition indicate the presence of weak acid sites in the studied catalysts. The indicated catalysts characteristics are compared with the results obtained in the transesterification process of sunflower oil triglycerides by ethanol and butan-1-ol. It was found that there is a correlation between the surface acidity of catalyst and the reaction initial rate of triglycerides transesterification by ethanol and butan-1-ol. At the same time, such a correlation is absent for the surface basicity of the catalysts. This is consistent with the data on the catalysis of the triglyceride transesterification reaction only by strong major active sites. It is concluded that the transesterification reaction of sunflower oil triglycerides by ethanol and butan-1-ol occurs predominantly on the weak acid centers of the d-metal oxides.

Effect of Support Nature on Physicochemical Characteristics and Catalytic Properties of B-P-V-W-Ox Oxide Compositions in the Condensation Reaction by Acetic Acid with Formaldehyde

The influence of the support nature on physicochemical characteristics (surface acidity, porous structure) of complex oxide compositions B-P-V-W-Ox and their catalytic properties (activity, selectivity) in the reaction of gas-phase aldol condensation of acetic acid with formaldehyde to obtain acrylic acid was studied. It was found that the activity of catalysts varies symbolically with the size of the specific surface, and the selectivity of the formation of acrylic acid is determined by the presence of weak acid centers on the surface of the catalyst. In the presence of the catalyst B-P-V-W-Ox/TiO2 at a temperature of 375°C, acrylic acid was obtained with a yield of ~59% with a selectivity of formation of 92%.

A Highly Dispersed Copper Nanoparticles Catalyst with a Large Number of Weak Acid Centers for Efficiently Synthesizing the High Value-Added 3-Methylindole by Aniline and Biomass-Derived Glycerin

An excellent catalyst with a large number of weak acid centers and highly dispersed copper nanoparticles embedded in mesoporous SBA-15 carrier was successfully constructed for the purpose of efficient conversion of aniline with biomass-derived glycerin to the high value-added 3-methylindole, in which the catalyst of Cu/SBA-15 was modified with Al2O3, La2O3 and CoO in sequence. The modified carrier and the copper-based catalysts were studied by scanning electron microscopy and energy-dispersive X-ray (SEM–EDX) spectroscopy, nitrogen physical adsorption, ammonia temperature programmed desorption (NH3-TPD), hydrogen temperature programmed reduction (H2-TPR), powder X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric and differential thermal analysis (TG–DTA) and inductively coupled plasma (ICP) emission spectroscopy. The research found that the Cu/CoO/La2O3/Al2O3/SBA-15 catalyst exhibited a very good catalytic performance with 3-methylindole yield up to 73.3% and selectivity reaching 86.4%. Besides, only a 3.9% yield decreased after the catalyst was circulated seven times. The characterizations revealed that Al2O3 could enhance the polarity of the carrier, thereby the interaction between the active component and the composite carrier was strengthened and the dispersion of copper was increased significantly. Adding La2O3 to Cu/SBA-15-Al2O3 could weaken the acidity and inhibit the formation of carbon deposits. CoO promoter could increase the number of weak acid centers, which was conducive to a good dispersion of active component and the high selectivity of 3-methylindole. Furthermore, the reaction pathway of gas-phase synthesis of 3-methylindole from glycerin and aniline on Cu/CoO/La2O3/Al2O3/SBA-15 was explored.

Synthesis and enhanced antioxidant and membrane-protective activity of curcumin@AlOOH nanoparticles

The ever increasing demand for nanoantioxidants with minimized toxicity dictates the necessity to develop new biocompatible materials. One promising approach is the immobilization of polyphenols on metal (oxy)hydroxide nanoparticles (NPs) that possess the desired chemical and colloidal stability while also allowing to dispose of the antioxidants more safely and effectively. In this paper we modify sol-gel synthesized γ-AlOOH NPs with curcumin molecules. The prepared colloidal systems are hydrosols, stable in acidic, neutral and slightly basic pH values. UV–vis and FTIR spectroscopies suggest that the mechanism of curcumin binding lies in the H-bonding of its functional groups to hydroxyls of pseudoboemite. Modification of AlOOH nanoparticles shifts its isoelectric point from 9.7 to 9.3 due to the weak acidic centers of the polyphenol. Immobilization of curcumin molecules on pseudoboehmite allows to achieve good solubility of the phenol in water and to reduce the level of its hemolytic activity (indicating good biocompatibility). At the same time, it preserves radical scavenging activity and in some experimental designs even enhances antioxidant and membrane-protective activity (enhancement ≥30%) in vitro on cellular and non-cellular models.

Efficient synthesis of 3-methylindole using biomass-derived glycerol and aniline over ZnO and CeO2 modified Ag/SBA-15 catalysts

An efficient mesoporous catalyst of Ag/SBA-15 modified with ZnO and CeO2 was successfully constructed with the purpose of efficiently synthesizing 3-methylindole by biomass-derived glycerol and aniline, which up to 62% yield and 75% selectivity for 3-methylindole were achieved when Ag loading was 1.00 mmol/g−1, ZnO or CeO2 content was 1.00 or 0.05 mmol/g−1, respectively. And only 3% yield decreased when the catalyst was circulated five times. The characterizations researches on N2 physical adsorption, Fourier transform infrared (FT-IR), scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDX), temperature programmed reduction of hydrogen (H2-TPR), X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature programmed desorption (TPD) of NH3 and CO2, thermogravimetric and differential thermal analysis (TG-DTA) indicated that adding the promoter of ZnO to Ag/SBA-15 increased the dispersion of the silver particles significantly and controlled the aggregation of Ag nanoparticles during the reaction remarkably because doping ZnO greatly increased the polarity of the composite carrier SBA–15–ZnO and brought about the interaction between Ag and carrier enhanced. CeO2 could promote the reduction of Ag2O and suppress the formation of carbon deposition effectively. In addition, doping ZnO and CeO2 increased the number of the weak-acid centers of the SBA-15 supported Ag-based catalyst observably, thereby the catalyst of Ag/SBA-15-ZnO-–ZnO–CeO2 acquired a good selectivity. Moreover, the reaction pathway for 3-methylindole synthesis by biomass-derived glycerol and aniline was probed in depth and a reasonable route was proposed.

INTERACTION OF THE Fe/γ-Al2O3 CATALYTIC SYSTEM WITH PROBE MOLECULES III. STUDY OF THE INTERACTION OF AMMONIA WITH γ-Al2O3 OXIDE AND THE Fe/γ-Al2O3 SYSTEM

The work is devoted to the study of the interaction of heterogeneous catalytic systems with adsorbedmolecules. It presents the results of the interaction of the initial γ-Al2O3 oxide and the Fe/γ-Al2O3 system withammonia obtained using IR spectroscopy and the method of temperature programmed desorption.Lewis and Bronsted acid centers were detected on the surface of both γ-Al2O3 oxide and the Fe/γ-Al2O3 systemduring their interaction with ammonia in the temperature range 293-773K using IR spectroscopy. The relativeintensity of the absorption bands corresponding to these centers depends on the temperature of interaction withammonia.It was found by ammonia TPD that adsorbed NH3 is desorbed in the form of five peaks from the γ-Al2O3 surfaceon a temperature scale, and in the form of seven peaks from the surface of the Fe/γ-Al2O3 system. It was shown thatthe total amount of desorbed ammonia decreases markedly with increasing adsorption temperature. Moreover, forindividual temperature peaks, the amount of adsorbed ammonia can either decrease, pass through an extremum, orremain approximately constant. The appearance of additional desorption peaks for the Fe/γ-Al2O3 system isassociated with iron deposited on alumina.Proceeding from the temperature range of existence of desorption peaks for γ-Al2O3 oxide and the Fe/γ-Al2O3system it was established that they contain weak acid centers (desorption temperature up to 523K), acidic centers ofmedium strength (desorption temperature from 523 to 613K) and strong acid sites (desorption temperature above613K). The volume of desorbed ammonia in the indicated temperature ranges can serve as a quantitative measure ofvarious types of acid sites.

Promoting the selective catalytic oxidation of diethylamine over MnOx/ZSM-5 by surface acid centers

Herein, we demonstrated the selective catalytic oxidation of diethylamine to N2 over MnOx/ZSM-5 catalysts. It was found that oxidation activity of diethylamine over MnOx/ZSM-5 catalysts increased when the loading of Mn increased, but the N2 selectivity decreased at 420 °C obviously. MnOx/ZSM-5(360) catalysts showed higher oxidation activity of diethylamine than MnOx/ZSM-5(18) catalysts with equivalent Mn loading, which was ascribed to the presence of MnOx species easily reduced and enriched on ZSM-5(360) support surface. However, MnOx/ZSM-5(18) catalysts containing moderate and strong surface acid centers in addition to the weak acid centers gave significantly higher N2 selectivity than MnOx/ZSM-5(360) catalysts possessing only weak surface acid centers. 20MnOx/ZSM-5(18) catalyst had relatively high oxidation activity of diethylamine and N2 selectivity, of which the lowest reaction temperature for diethylamine conversion at 98% (T98) is 240 °C and the N2 selectivity is exceeding 95.5% at 420 °C. Furthermore, 20MnOx/ZSM-5(18) catalyst showed wider temperature window (ΔT = 180 °C) with N2 selectivity over 95% than 20MnOx/ZSM-5(360) catalyst (ΔT = 80 °C). It can be concluded that the easily reduced and surface enriched MnOx species are favorable for the oxidation of diethylamine, the moderate and strong surface acid centers are beneficial to activation of diethylamine and the generation of N2.

Hydroconversion of Residual Fatty Acids on a Molybdenum-Copper Catalyst

The molybdenum-copper catalyst was prepared by impregnating with an aqueous precursors solution by the pore filling method. The catalyst was characterized by determining the acid strength and textural characteristics. The catalyst contains predominantly weak acidic centers and the average pore diameter is 4.3 nm. Conversion of residual fatty acids into deoxygenated liquid were carried out on a laboratory equipment in continuous system using a fixed bed catalytic reactor. The reaction products where mainly linear hydrocarbons C15, C16, C17 and C18 and shorter chain hydrocarbons Keywords: residual fatty acids, biofuel, hydroconversion, catalyst acidity, Co, Mo, gama-Al2O3

Solvent-free ketalization of polyols over germanosilicate zeolites: the role of the nature and strength of acid sites

Weak acid centers of germanosilicate zeolites can serve as active sites in ketalization reactions.

Zr- and La-containing Catalysts in Synthesis of Methanol and Dimethyl Ether

Zirconium oxide samples synthesized and modified with Al, Si, W oxides were studied as dehydrating components of bifunctional catalysts for synthesis of dimethyl ether. ZrO2 modified with Al and Si oxides is inactive in the dehydration of methanol, but its dehydrating activity becomes comparable with the activity of γ-Al2O3 upon introduction of WO3. According to the data on methanol adsorption at 46°C, the adsorption capacity of ZrO2 modified with SiO2 is comparable with the capacity of γ-Al2O3, and that of ZrO2 modified with WO3 is four times lower. The difference in the catalytic and adsorption behavior of the samples is accounted for by the data of in situ high-temperature diffuse reflection IR spectroscopy. A high content of weak Bronsted acid centers is observed on the ZrO2 surface, with the interaction of these with methanol resulting in the methoxylation of the catalyst surface. When W oxide is deposited onto zirconium oxide, the surface has strong Bronsted centers involved in the reaction of methanol dehydration. A coprecipitation from solution of nitrate salts of Cu, Zn, La with Na carbonate, followed by the procedures of filtration, washing, and thermal treatment, yielded a catalyst for synthesis of methanol, the activity of which is close to that of the industrial catalyst.

Investigation of Catalytic Activity of Modified High-Silica Zeolite of MFI Type in the Process of Converting Straight-Run Gasoline

The influence of the concentration of the promoting additive of zerium(IV) oxide nanopowder on the acidic and catalytic properties of a high-silica MFI type of zeolite is investigated in the process of converting a straight-run gasoline fraction of gas condensate into high-octane components of motor fuels. It is shown that the addition of a nanosized zerium dioxide powder makes it possible to increase the concentration of weak acidic centers by 1.34 times, the yield of arenes in liquid products by 4–7 wt %, and the octane number of liquid catalyzate by 2–3 points according to the research method.