Molybdenum hybrid – Nanocrystals supported on modified Laponite composite as superior catalyst for vapour phase hydrodeoxygenation of clove oil

Krishnan, P. Santhana; Tamizhdurai, P.; Theres, G. Sonia; Shanthi, K.

doi:10.1016/j.renene.2019.10.052

Cited by 16 publications

(14 citation statements)

References 50 publications

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“…In HDO of eugenol, the NiMo/Laponite catalyst showed complete eugenol conversion and high selectivity to 3-and 4-propyl phenols with considerable yields of complete deoxygenated products (benzene and 4-propyl cyclohexene). 308 This excellent performance was attributed to high catalyst stability, improved metal dispersions, and strong metal−support interaction in Laponite composite supported NiMo catalyst. The effect of the preparation method and the morphology of the catalyst were studied in this work.…”

Section: Dehydration and Oxidative Dehydrationmentioning

confidence: 99%

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

et al. 2021

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Supported molybdenum oxide (MoO x ) and tungsten oxide (WO x ) materials are a vital class of solid acid catalysts for the chemical industry because of their nontoxic nature, strong acidity, remarkable stability in water, hydrogen, and oxygen atmospheres, and excellent reusability performance. These fascinating solid acids play a pivotal role in developing sustainable catalytic routes for renewable biomass processing to produce value-added fuels, chemicals, and platform molecules. The coordination chemistry of MoO x and WO x on the support materials (oxides, carbons, or zeolites) controls their acidic strength, active site accessibility, and catalytic activity. Hence, significant efforts have been made toward optimizing the conditions used for catalyst synthesis and biomass processing to tune the coordination chemistry of MoO x and WO x with the substrate molecules and, thus, their acid-activity/selectivity performance. This Review provides a comprehensive overview of supported MoO x and WO x solid acids for biomass valorization. The importance of the biomass and the role of solid acids for biomass valorization were emphasized, followed by a brief discussion of supported MoO x and WO x solid acids. Afterward, the interplay of coordination chemistry, acidic strength, and catalytic activity of supported MoO x and WO x solid acids was discussed. Finally, their catalytic applications for the valorization of several biomass substrates and their derivatives were summarized. This Review will provide valuable insights for developing advanced supported WO x and MoO x solid acids for catalytic biomass valorization and other challenging acid-catalyzed processes.

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Section: Dehydration and Oxidative Dehydrationmentioning

confidence: 99%

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

et al. 2021

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“…For syringalehyde, the first step that leads to the main product (DMP) is hydrodeoxygenation and decarbonylation to a minor extent. Adsorption of aromatics on Mo requires weak acid sites (Brønsted or coordinatively unsaturated sites) to give high HDO activity, 53 and decarbonylation requires weak Ni acid sites. 54 Weak acid sites take longer to deactivate than strong acid sites that cleave the molecule giving gaseous and demethylated products.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Thermocatalytic Hydrodeoxygenation and Depolymerization of Waste Lignin to Oxygenates and Biofuels in a Continuous Flow Reactor at Atmospheric Pressure

Mukundan

Boffito

Shrotri

et al. 2020

ACS Sustainable Chem. Eng.

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Lignin is the only biomolecule with aromatics that could serve as a feedstock to displace some petroleum for specialty chemicals. However, catalysts that are active and selective on model compounds for lignin fail when applied to real lignin with respect to performance and reaction mechanism. Here, we report kinetic data based on atomizing aqueous solutions of waste lignin, guaiacol, and syringaldehyde in a continuous catalytic fixed bed reactor operating at atmospheric pressure, a 5 s residence time, and a 30 mL min–1 (1:2 Ar:H2) volumetric flow rate (STP). The catalyst, NiMoS2 supported on activated carbon, was synthesized by a microemulsion technique and exhibited a combination of weak, strong, and very strong acid sites. Syringaldehyde reacted mostly to liquid products, and conversion increased with time-on-stream from 42% to 72% after 5 h. The main products were 2,6-dimethoxy-4-methylphenol and 1,6 dimethoxyphenol through hydrodeoxygenation and decarbonylation, respectively. Guaiacol conversion decreased with time-on-stream and ranged from 76% to 62% after 5 h. The main product was toluene via catechol, cresol, and phenol as intermediates. We propose reaction pathways for both syringaldehyde and guaiacol. The liquid fraction produced from the conversion of waste lignin contained 16 compounds that were mostly organic acids, followed by aldehydes, alcohols, and ketones.

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“…The organo-functional alteration in mesoporous silica allows one to customize the surface area characteristics, which are beneficial for numerous applications in the field of heterogeneous catalysis . Usually, the functionalized synthesis of mesoporous materials come with two strategies: the first synthesis strategy, in which a silane that consists of an IL functional group, were introduced on the synthetic mixture in the course of mesoporous materials synthesis; and the secondary strategy is by way of post-grafting, in which the organosilane can be grafted following the mesoporous support synthesis. , SBA-15 is one of the potential choices in siliceous supports for the binding of organocatalyst, because of their large surface area, pore volume, thermal stability, and consistent pore-size distributions. − Here, we report our recent investigation on 1-ethyl-3-methylimidazolium triflate and 1-ethyl-3-methylimidazolium chloride + AlCl 3 (different ratios) IL catalysts immobilized on SBA-15 as heterogeneous organocatalysts and its potential catalytic application toward isomerization of n -pentane, n -hexane, and light naphtha conversion reactions. Furthermore, the impact of pressure, reaction temperature, weight hourly space velocity (WHSV), and H 2 ratio have been completely examined in depth.…”

Section: Introductionmentioning

confidence: 99%

Isomerization of Alkanes over Ionic Liquids Supported on SBA-15

et al. 2020

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Exploring the catalytic efficiency of ionic liquid supported on mesoporous material as heterogeneous organ catalysts for example, 1-Ethyl-3-methylimidazolium triflate and 1-ethyl-3-methylimidazolium chloride + AlCl 3 (different ratio) immobilized on SBA-15 that contains 0.5% platinum, with regard to isomerization of n-pentane and n-hexane, along with commercial light naphtha feed conversion reactions. The prepared materials were characterized by several instrumental methods, which include temperature-programmed desorption to evaluate acid strength. The reactions were performed in a fixed-bed stainless steel reactor having high pressure by the down-flow method. This valuable novel isomerization reaction was strongly influenced by many key parameters, for instance, temperature, pressure, weight hourly space velocity, and flow rate of H 2 , which are discussed in detail. The Pt/EMIM-AlCl 4 (1:1)20/SBA-15 ionic liquid catalyst showed superior catalytic performance out of the four-catalyst system examined toward the above reactions, which is undoubtedly due to its significant turnover frequencies values of 8.6 s −1 and 8.5 s −1 and specific reaction rates values of 8.01 × 10 −4 mol g −1 s −1 and 8.00 × 10 −4 mol g −1 s −1 for n-pentane and n-hexane correspondingly. The order of catalytic activity is Pt/EMIM-AlCl 4 (1:1)20/SBA-15 > Pt-EMIM-Tf/SBA-15 > Pt/EMIM-Al 2 Cl 7 (1:2)20/SBA-15 > Pt-EMIM-Al 2 Cl 7 (1:2)30/SBA-15.

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Molybdenum hybrid – Nanocrystals supported on modified Laponite composite as superior catalyst for vapour phase hydrodeoxygenation of clove oil

Cited by 16 publications

References 50 publications

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Thermocatalytic Hydrodeoxygenation and Depolymerization of Waste Lignin to Oxygenates and Biofuels in a Continuous Flow Reactor at Atmospheric Pressure

Isomerization of Alkanes over Ionic Liquids Supported on SBA-15

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Molybdenum hybrid – Nanocrystals supported on modified Laponite composite as superior catalyst for vapour phase hydrodeoxygenation of clove oil

Cited by 16 publications

References 50 publications

Supported MoOx and WOx Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Supported MoOx and WOx Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Thermocatalytic Hydrodeoxygenation and Depolymerization of Waste Lignin to Oxygenates and Biofuels in a Continuous Flow Reactor at Atmospheric Pressure

Isomerization of Alkanes over Ionic Liquids Supported on SBA-15

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Product

Resources

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Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis