Deoxygenation Reaction Research Articles

Bifunctional CaCO3/HY Catalyst in the Simultaneous Cracking-Deoxygenation of Palm Oil to Diesel-Range Hydrocarbons

Palm oil is a promising raw material for biofuel production using the simultaneous catalytic mechanism of the bifunctional cracking-deoxygenation reactions. Through the cracking-deoxygenation process, the chains of palmitic acid and oleic acid in the palm oil were converted to diesel-range hydrocarbons. The combination effects of CaCO3 and HY zeolite enhanced the bifunctional catalytic cracking-deoxygenation of palm oil into biofuel, because of the increasing acid and basic sites in the catalysts due to the synergistic roles of CaCO3 and HY. The introduction of CaCO3 on HY zeolite generated both a strong acid and strong basic sites simultaneously on the designed catalyst, which supports the bifunctional mechanisms of hybrid cracking-deoxygenation, respectively. The CaCO3 impregnated on the HY catalyst has a synergistic and bifunctional effect on the catalyst supporting cracking-deoxygenation reaction mechanisms as mentioned previously. The deoxygenation reaction required the bifunctional strong acid and strong basic sites on the CaCO3/HY catalyst through decarboxylation, decarbonylation, and hydrodeoxygenation reaction mechanisms. Meanwhile, the cracking reaction pathway was supported by the strong acid sites generated on the CaCO3/HY catalyst. In other words, the high acidity strength promotes diesel selectivity, whereas the high strength of basicity leads to the deoxygenation reaction.

Catalytic Deoxygenation of Oleic Acid Over CoMo/Zeolite Catalyst for Green Diesel Production

Due to the presence of certain oxygenated species, green diesel from deoxygenation (DO) technology was developed to replace traditional biodiesel. In this study CoMo-based catalyst was supported on zeolite for deoxygenation reactions. The catalyst was prepared by the wet impregnation method and then calcinated under a 20 mL min-1 N2 flow rate for 4 hours at a temperature of 550○C. The prepared catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Thermo-Gravimetric Analysis (TGA), and Scanning Electron Microscopy (SEM) analysis. The effect of zeolite on the removal of the different oxygenated functional groups was investigated in the deoxygenation of oleic acid over supported CoMo catalysts at 350°C and atmospheric pressure. The deoxygenated liquid products were characterized by Fourier-transform infrared spectroscopy (FTIR), Gas Chromatography-Mass Spectrometry (GC-MS), and Higher heating value (HHV). Based on the study results, CoMo/Zeolite is give 90.86% hydrocarbon yield for 2 hrs. at 350°C and 300 rpm. Overall, The CoMo/Zeolite showed good catalytic performance due to its good physicochemical properties.

Redox-Neutral Transformations of Carbon Dioxide Using Coordinatively Unsaturated Late Metal Silyl Amide Complexes.

Two-coordinate silylamido complexes of nickel and copper rapidly react with CO2 to selectively form a new cyanate ligand along with hexamethyldisiloxane byproducts. Mechanistic insight into these reactions was obtained from the synthesis of proposed intermediates, several silyl- and phenyl- substituted amido analogues, and their subsequent reactivity with CO2. These studies suggest that a unique intramolecular double silyl transfer step facilitates CO2 deoxygenation, which likely contributes to the rapid rates of reaction. The deoxygenation reactions create a platform for a synthetic cycle in which copper amido complexes convert CO2 to organic silylcarbamates.

On Stability of High-Surface-Area Al2O3, TiO2, SiO2-Al2O3, and Activated Carbon Supports during Preparation of NiMo Sulfide Catalysts for Parallel Deoxygenation of Octanoic Acid and Hydrodesulfurization of 1-Benzothiophene

NiMo sulfide catalysts were prepared by the impregnation of high surface area supports with an aqueous solution made of NiCO3·2Ni(OH)2, MoO3 and citric acid, followed by freeze drying and sulfidation in H2S/H2 mixture. N2 physisorption and X-ray diffraction were selected to investigate the amphoteric oxides Al2O3 and TiO2, acidic SiO2-Al2O3 and activated carbon supports, fresh prepared sulfide NiMo catalysts and spent catalysts after model parallel reaction of octanoic acid deoxygenation and 1-benzothiophene hydrodesulfurization. The studied mesoporous amphoteric oxides Al2O3 and TiO2 did not lead to highly active NiMo catalysts due to the low hydrothermal stability of these supports during the preparation of the active sulfide phase and deoxygenation reaction. The most active catalyst based on oxidic support was the NiMo sulfide supported on acidic mesoporous SiO2-Al2O3, which was explained by the increased stability of this support to the water and CO/CO2 mixture during the activation of the sulfidic phase and deoxygenation reaction. The extraordinarily high stability of the activated carbon support led to outstanding activities of the sulfidic NiMo/C catalyst.

How do crystal shapes of nano-ceria determine its ketonization performance during biomass pyrolysis?

Catalytic pyrolysis of biomass over CeO2 to prepare ketonic chemicals is an important way to achieve carbon emission reduction, whereas the role of catalyst structure has long been overlooked. In this work, nano-CeO2 with different crystal shapes, namely nanorods (R-CeO2), nano-polyhedra (P-CeO2), and nanocubes (C-CeO2), were synthesized and then tested in catalytic ketonization of xylan. Results showed that among all the three catalysts, C-CeO2 produced the highest yield of ketones. Characterization results revealed that C-CeO2 presented the lowest content of oxygen vacancies while exhibiting the highest proportion of {100} facets, proving that the {100} facets made a greater contribution to the total yield of ketones. On the other hand, P-CeO2 and R-CeO2 displayed a better selectivity to linear ketones, which was beneficial to improving the product quality. The relative contents of {111} facets of these catalysts were higher than C-CeO2, demonstrating that the {111} facets could selectively produce linear ketones. The proposed mechanism indicated that P-CeO2 and R-CeO2 principally enhanced the ketonic deoxygenation reactions, while C-CeO2 also promoted the recyclization reaction, producing more cyclic ketones. These findings disclose that the {111} facets of CeO2 are more favorable to producing valuable linear ketones.

Selective Hydrodeoxygenation of Aromatics to Cyclohexanols over Ru Single Atoms Supported on CeO2.

Cyclohexanols are widely used chemicals, which are mainly produced by oxidation of fossil feedstocks. Selective hydrodeoxygenation of lignin derivatives has great potential for producing these chemicals but is challenging to obtain high yields. Here, we report that CeO2-supported Ru single-atom catalysts (SACs) enabled the hydrogenation of the benzene ring and catalyzed etheric C-O(R) bond cleavage without changing the C-O(H) bond, which could afford 99.9% yields of cyclohexanols. As far as we know, this is the first to report that SACs catalyze hydrogenation of the aromatic ring. The reaction mechanism was studied by control experiments and density functional theory calculations. In the catalysts, the Ru-O-Ce sites were formed and one Ru atom was coordinated with about four O atoms. These catalytic sites could realize both the hydrogenation and deoxygenation reactions efficiently, and thus desired cyclohexanols were generated. This work pioneers the single-atom catalysis in aromatic transformation and provides a novel route for synthesis of cyclohexanols.

Synergistic effect of bimetallic Fe-Ni supported on hexagonal mesoporous silica for production of hydrocarbon-like biofuels via deoxygenation under hydrogen-free condition

The need to explore a sustainable manner to produce hydrocarbon-like biofuel has attracted tremendous interest. A series of bimetallic catalysts comprised of Fe and Ni with different Ni loadings supported on hexagonal mesoporous silica (HMS) were synthesized for the production of hydrocarbon-like biofuel via deoxygenation (DO) reaction without the use of external hydrogen. The bimetallic 10Fe40Ni/HMS catalyst possesses a high conversion (96.1%) and selectivity towards C8-C20 hydrocarbon (91.8%) during the DO reaction. This is because the finely dispersed Fe and Ni consisting of NiO and NiFe2O4 demonstrate strong acidity along with higher amount of Brönsted-Lewis acid properties. The DO reaction of triglycerides with bimetallic Fe and Ni supported on HMS is a sustainable process to produce hydrocarbon biofuel.

Oxygen Healing and CO2 /H2 /Anisole Dissociation on Reduced Molybdenum Oxide Surfaces Studied by Density Functional Theory.

Reduced molybdenum oxides are versatile catalysts for deoxygenation and hydrodeoxygenation reactions. In this work, we have performed spin-polarized DFT calculations to investigate oxygen healing energies on reduced molybdenum oxides (reduced α-MoO3 , γ-Mo4 O11 and MoO2 ). We find that Mo+4 on MoO2 (100) is the most active for abstracting an oxygen from the oxygenated compounds. We further explored CO2 adsorption and dissociation on reduced α-MoO3 (010) and MoO2 (100). In comparison to reduced α-MoO3 (010), CO2 adsorbs more strongly on MoO2 (100). We find that CO2 dissociates on MoO2 (100) via a two-step process, the overall barrier for which is 0.6 eV. This barrier is 1.7 eV lower than that on reduced α-MoO3 (010), suggesting a much higher activity for deoxygenation of CO2 to CO. As H2 dissociation is shown to be the rate-limiting step for hydrodeoxygenation reactions, we also studied activation barriers for H2 chemisorption on MoO2 (100). We find that the chemisorption barriers are 0.7 eV lower than that reported on reduced α-MoO3 (010). Finally, we have studied the dissociation (C-O cleavage) of anisole (a lignin-based biofuel model compound) on MoO2 (100). We find that anisole binds very strongly on MoO2 (100) with an adsorption energy of -1.47 eV. According to Sabatier's principle, strongly adsorbing reactants poison the catalyst surface, which may explain the low activity of MoO2 observed during experiments for hydrodeoxygenation of anisole.

Preparation of Metal-Acid bifunctional catalyst Ni/ZSM-22 for palmitic acid catalytic deoxygenation

In this work, methods employing ethanol for dispersion as well as precursor combination by rotary evaporation were combined to produce Ni-based ZSM-22 catalysts. The catalytic activity in palmitic acid deoxygenation over Ni/Z22@E was enhanced compared with that of the wet-impregnated method. The conversion of palmitic acid reached 98.9 %, in which C16/C15 alkane was as high as 4.07. The Ni species on the surface of catalysts showed strong stability so that not susceptible to inactivation by coking or leaching. In addition, the mechanism and kinetics of the palmitic acid deoxygenation reaction were analyzed. The results showed that the ethanol dehydration reaction was the most difficult to occur, and the high C16 alkanes selectivity can be attributed to the low activation energy of the hydrodeoxygenation (HDO) pathway. Both experimental and kinetics calculation results suggested that there may be a mechanistic change in the fatty acid deoxygenation reaction at around 240 °C that resulted in a large increase in the hydrodecarboxylation (HDX) pathway. Based on this, selected adjustments of the products were proposed for fatty alcohols below 220 °C, C16 alkanes between 260 and 280 °C, and C15 alkanes above 280 °C.

Enantiospecific Syntheses of Congested Atropisomers through Chiral Bis(aryne) Synthetic Equivalents.

The synthetic equivalents of the enantiopure binaphthyl bis(aryne) atropisomers derived from BINOL (1,1'-bi-2,2'-naphtol) featuring a stereogenic axis vicinal to the two reactive triple bonds can be generated for the first time in solution in an enantiospecific manner. Using a two-step sequence based on the bidirectional [4+2] cycloaddition of furan derivatives followed by an aromatizative deoxygenation reaction, several 9,9'-bianthracenyl-based atropisomers could be prepared enantiospecifically in high enantiomeric purity. Alternatively, bidirectional reactions with anthracene, 2-bromostyrene, and perylene as the arynophiles afforded very congested bis(benzotriptycene), bis(tetraphene) and bis(anthra[1,2,3,4-ghi]perylene) nanocarbon atropisomers in equally high enantiomeric purity. In complement, cross reactions with two different arynophiles revealed possible. The unusual atropisomer prototypes described in this study open the way to enantiopure nanographene atropisomers designed for functions.

In-situ catalytic upgrading of Hami coal pyrolysis volatiles over acid-modified kaolin

Low-cost kaolin was modified by calcination at different temperatures, followed by HCl leaching, and used as catalyst for in-situ upgrading of Hami coal pyrolysis volatiles in a fixed-bed reactor. The catalyst characteristics, pyrolysis product distributions and tar properties were investigated by multiple methods to understand the relationship between catalyst properties and tar quality. The results indicated that calcination of kaolin promoted the formation of amorphous metakaolin, then the HCl leaching removed most metakaolin framework Al, leading to the production of abundant micro-/mesopores and acid sites. As the rising calcination temperature, the specific surface area and pore volume of acid-modified kaolin (AMK) showed a trend of increasing and then decreasing, and the Brønsted acid sites (BAS) displayed an increasing trend. Compared to non-catalytic pyrolysis, the high specific surface area and certain acid sites of AMKs enhanced the light tar fraction from 37.81 wt% to 43.00–48.45 wt%, and the relative content of aromatics in tar increased from 9.76% to 16.65–22.11%, with monocyclic aromatics, naphthalenes and polycyclic aromatics increasing to 3.5–4.2, 1.2–1.8 and 2.1–3.3 times higher, respectively. AMKs also reduced the content of element O in tar by 17.92–31.54% by promoting the deoxygenation reaction. The tar upgrading performance was determined by the BAS amount and the pore structure of AMKs together. Among all AMKs, AMK800 (calcined at 800 °C and treated by HCl) exhibited the optimum performance for heavy tar conversion, aromatics generation and oxygen removal due to its highest specific surface area and the maximum BAS except AMK900. The acid-modified kaolin has the potential to be an inexpensive and efficient catalyst for future practical applications of upgrading coal pyrolysis tar.

Catalytic co-pyrolysis of Chlorella vulgaris and urea: Thermal behaviors, product characteristics, and reaction pathways

The catalytic pyrolysis behavior of Chlorella vulgaris (CV) with urea (UR), and its product distribution were investigated using TG-FTIR and Py-GC/MS. The mechanism of formation of nitrogen- and oxygen- containing compounds (NOCCs) were determined using density functional theory (DFT). The thermogravimetric results demonstrated that the introduction of UR reduced the temperature (342 ℃) of the mass loss peak of CV, and the pyrolysis activation energies of the mixtures were lower than that of CV pyrolysis (208 kJ/mol). The FTIR results indicated that the pyrolysis of UR with CV promoted the formation of oxygen-containing functional groups, while the addition of HZSM-5 enhanced the deoxygenation reaction and suppressed the release of NH3. In terms of fast pyrolysis products, the pyrolysis of CV with UR decreased the content of long-chain nitriles in nitrogen-containing compounds (NCCs) and esters in oxygen-containing compounds (OCCs). Meanwhile, the reaction between amino acids and urea decomposed derivatives was promoted to generate NOCCs such as imidazolidinediones and morpholines. The addition of catalyst was relatively more conducive to the formation of nitriles (4.89–8.64%). The possible reaction pathways of the formation of NOCCs were proposed using the intermediate products generated by CV and UR pyrolysis. The energy barriers (ΔG*) of the reaction pathways were calculated by DFT, and the rationality of each possible pathway was verified. This study confirmed the synergistic effect during the pyrolysis of CV with UR, and elucidated the partial transformation mechanism of N and O during the pyrolysis reaction. This can provide the necessary theoretical guidance for the preparation of high-value nitrogenous chemicals.

Study the effect of zeolite pore size and acidity on the catalytic pyrolysis of Kraft lignin

In this study, three zeolites with different pore sizes and acidity, H-Beta, HY and HZSM-5, were used for the preparation of bio-oil by catalytic pyrolysis of Kraft lignin at 600 °C. The three-dimensional sizes and kinetic diameters of the bio-oil components were calculated using quantum chemical calculations, and the bio-oil was analyzed by heteronuclear single quantum coherence nuclear magnetic resonance (HSQC-NMR). The effects of zeolite acidity and pore size on the bio-oil upgrading process were studied for the pyrolysis products of Kraft lignin. The results showed that optimum pore size of the zeolites ranged from 6.500 Å–8.400 Å during the catalyzed pyrolysis of lignin. Among the zeolites, the H-Beta zeolite is the most effective in the lignin pyrolysis. The results also showed that the pore size and acidity of the zeolites had a significant effect on the product yields, coking and deoxygenation. The pore size affects the coking and dehydration reactions, while the acidity can promote the rearrangement of ether bonds or the breaking of lignin side chains and deoxygenation reactions. This study would be beneficial to improve the zeolite catalytic activity and minimize the oxygen content in bio-oil produced from the pyrolysis of Kraft lignin.

Valorisation of cotton stalk toward bio-aromatics: Effect of wet torrefaction deoxygenation and deminerization pretreatment on catalytic fast pyrolysis using Ga modified hierarchical zeolite

Wet torrefaction pretreatment (WTP) can upgrade the property of biomass by synergistic effect of deoxygenation and deminerization (e.g. K, Ca, Na, Mg). In this work, valorisation of cotton stalk (CS) was performed by using combined approaches of WTP and catalytic fast pyrolysis (CFP) to produce bio-aromatics. First, the maximum deoxygenation and deminerization rates were 53.84 % and over 90 %, respectively, at the WTP temperature of 260 °C. Second, the bifunctional catalyst of Ga modified hierarchical HZSM-5 with micro-mesopore structure allowed more oxygenates diffusing into the channel of catalyst and increased the reaction rates of deoxygenation and aromatization reactions which highly improved the yield of bio-aromatics. Third, higher CFP temperature was favored for the formation of aromatics. The yield of aromatics increased first with the raise of catalyst-to-biomass (C/B) ratio from 1:1 to 1:3, then decreased slightly at the highest C/B of 1:5. At last, the operation parameter of WTP and SS-CFP was optimized which the maximum yield of light aromatics was 1.08 × 108 a.u./mg at WTP temperature of 220 °C, biomass-to-catalyst ratio of 3:1, and CFP temperature of 850 °C.

Advancing biomass pyrolysis by torrefaction pretreatment: Linking the productions of bio-oil and oxygenated chemicals to torrefaction severity

Torrefaction is an efficient pretreatment method to improve the quality of biomass feedstock and resulting bio-oil. Herein, the relationships of torrefaction severity of sweet sorghum bagasse (SSB) with its physicochemical properties and resulting pyrolytic product distributions were systemically investigated. The SSB was first pretreated by torrefaction at different temperatures (230, 260, and 290 °C) with a constant residence time of 30 min, and the resulting torrefied SSB was subsequently pyrolyzed at 500 °C for the production of bio-oil. The carbon enrichment index (CEI) is used as an indicator to quantitatively reflect the torrefaction severity of SSB. The results show that the extents of decarbonization, dehydrogenation, and deoxygenation reactions of SSB increase linearly with the increase of CEI, and the extent of deoxygenation reaction is the most severe among them. Torrefaction can effectively regulate the pyrolytic production distributions of SSB, and severe torrefaction favors the formation of biochar. The productions of bio-oil and major oxygenated chemicals (e.g., ketones, carboxylic acids, and phenols) in bio-oil as the functions of CEI could be fitted well by quadratic polynomial functions. The findings can guide the rational design and optimization of the torrefaction process for improved biomass pyrolysis.

Carbon sequestration for high-quality sludge-based carbon preparation via K/Na bi-molten salts pyrolysis.

Pyrolysis carbonization of sewage sludge is employed to achieve carbon sequestration and access carbon resources, while the quality of the obtained sludge-based carbon (SBC) is poor due to high ash contents and volatile organic matter. Here, carbonization in KOH/Na2CO3 (K/Na) bi-molten salts was developed for SBC preparation, improvement of carbon exploitation from biomass, and to reduce the contents of ash and volatile organic matter. The results showed that the surface area and pore volume of SBC under optimized conditions reached 1631 m2g-1 and 1.312 cm3g-1 at 700°C, respectively, with a K/Na bi-molten salts/sludge ratio of 2:1 (K:Na = 5:5). Moreover, over fivefold the higher surface area and 43.61% amount of carbon element could be obtained, with a decrease in the mass loss rate for sludge pyrolysis of 25%. The mechanism behind the higher surface area of the SBC was identified and divided into three stages: intense dehydration and dehydrogenation caused by molten salt-enhanced polycondensation of protein and polysaccharide (200-400°C), strongly reduced carbon-oxygen structure after deoxygenation reactions (400-600°C), aromatization and cyclization of long-chain fatty acids triggered by deamidation of tar catalyzed by molten salts (600-900°C). Eventually, 14.63% carbon was sequestered for the high-surface-area SBC prepared by K/Na bi-molten salts system.

Lawesson's Reagent‐Mediated Deoxygenation Reactions

AbstractIn recent years, some new functions of Lawesson's reagent have been revealed, among which the deoxygenation reactions account for the most and have been applied in the syntheses of natural products and functional materials. However, this field has not been reviewed in detail. In continuation of our research interest in sulfur chemistry, herein we reviewed the recent advances in LR‐mediated deoxygenation reactions from the following four aspects: deoxygenation, dehydration, decarbonylation, and miscellaneous. This review not only may provide ideas for removing oxygen atoms from various functional groups, but also may promote the divergent syntheses of natural products in different families.

Gas-phase catalytic hydrodeoxygenation of phenolic compounds derived from lignin pyrolysis for hydrocarbon production using Ni@HZSM-5-γ-Al2O3

The bio-oils derived from fast pyrolysis of lignin contain large amount of phenolic components. Due to its high oxygen content, it cannot be used directly as traffic liquid fuels. Currently, hydrodeoxygenation (HDO) is an effective method for upgrading bio-oil to produce high-quality liquid fuels. However, catalysts have a key role in the selective hydrogenolysis of oxygen-containing groups (e.g. -OCH3). In this study, the mixed supported nickel-based catalyst Ni@HZSM-5-γ-Al2O3 was successfully prepared by the impregnation method. The influence of the temperature, pressure, hydrogen flow rate and weight hourly space velocity (WHSV) on the HDO activity was investigated. Under the optimized conditions (350 °C, 15 bar, 350 mL/min H2, 1 h−1), the conversion of guaiacol reached 98.73%, and the product liquid yields and hydrocarbon contents were 39.82% and 86.85%, respectively. In particular, the contents of aromatics and alkanes were 49.60% and 37.25%, respectively. Based on catalyst evaluation and characterization, the mechanism of guaiacol HDO was explored. Demethylation, direct deoxygenation, hydrogenation, hydrolysis, transalkylation and condensation reactions were considered as the main pathways.

Carbon-Supported Potassium Hydride for Efficient Low-Temperature Desulfurization.

The industrial removal of organosulfur impurities from fossil fuels relies on transition‐metal‐based catalysts in harsh conditions (ca. 400 °C, up to 100 bar H2), yet desulfurization (DS) of refractory alkyl dibenzothiophenes (DBTs) remains challenging. Here, we report that carbon‐supported potassium hydride (KH/C) enables efficient DS of DBTs in mild conditions, viz. >97 % conversion of DBTs is achieved at 165 °C in 3–6 h while the yields of respective biphenyls are 84–95 % by using only 15 % excess of KH per a C−S bond. In addition, KH/C allows to lower the concentration of 4,6‐Me2DBT in the mesitylene solution from 1000 ppm to <3 ppm (165 °C, 20 h) and provides deoxygenation, denitrogenation and catalytic aromatic hydrogenation reactions. DS of various sulfur heterocycles by using KH/C, a transition‐metal‐free material based on earth abundant elements, is viable at low temperature and has prospects for the further development towards decentralized removal of organosulfur species from fossil fuels.

Production of green diesel via hydrogen-free and solventless deoxygenation reaction of waste cooking oil

This work was successfully produced green diesel from domestic waste cooking oil via hydrogen-free and solventless deoxygenation over nickel-cobalt/organosilane-SBA-15 catalyst. Highly effective mesostructured catalyst has been synthesized by functionalizing with selected loadings of 3-Mercaptopropyl (trimethoxysilane) (MPTMS) onto SBA-15 by co-condensation method, followed by nickel and cobalt impregnation to produce 5Ni5Co/SBA-15-SH 0.1, 5Ni5Co/SBA-15-SH 0.3 and 5Ni5Co/SBA-15-SH 0.5. The 5Ni5Co/SBA-15-SH 0.1 catalyst exhibits high surface area and pore size (509 m2/g, 4.6 nm), which proved that the addition of MPTMS had increased the surface area and pore size due to the interaction between MPTMS and TEOS. The acidity of the synthesized catalyst also remarkably increased after MPTMS functionalization, suggesting the presence of the sulfonic acid group derived from the oxidation of MPTMS has enhanced the acidity of the catalyst. The amount of nickel and cobalt successfully impregnated onto the catalysts also show increment (5%–9%) following the amount of MPTMS added, which attributed to a strong interaction between metal species and support surface result in a homogeneous distribution of nickel and cobalt as observed in HRTEM. The MPTMS functionalization has successfully enlarged the surface area and increased the catalyst's acidic properties, enhancing the catalyst's deoxygenation activity. The catalytic activity study via deoxygenation was performed in a solventless and hydrogen-free reaction system to produce green diesel (350 °C within 2 h using 5%wt. Catalyst loading). Based on GC-FID analysis, it was proven that 5Ni5Co/SBA-15-SH 0.1 exhibits high hydrocarbon yield (77%) and diesel selectivity (70%) with the reusable catalyst for 4 catalytic cycles by maintaining the catalyst's selectivity. Hence, this work can produce green diesel from low-cost waste cooking oil via the synthesized organosilane-functionalized catalyst.