Development of Fe‐, Sb‐, Bi‐ and Al‐impregnated silica catalysts using rice husk silica as a support for Friedel–Crafts benzylation of arenes

Shinde, Ajit B.; Shrigadi, Nilesh B.; Samant, Shriniwas D.

doi:10.1002/jctb.925

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…Cellulase treatment of the HBS pulp gave glucose, and its yield was 27.4% at a maximum. Although some innovative method might be needed to improve the yield of glucose, rice husks could be good sources of xylose obtained by preacid hydrolysis, glucose obtained by cellulase treatment of HBS pulp, HBS lignin that could be used as medicinal substances , and highly pure silica, which would be used for various silica-supported metal catalysts including Ni/SiO 2 , Cu/SiO 2 , Al/SiO 2 , and Fe/SiO 2 − , from the viewpoint of biomass refinery process.…”

Section: Resultsmentioning

confidence: 99%

Quality Determination of Nickel-Loaded Silica Prepared from Poaceous Biomass

Ubukata

Mitsuhashi²,

Ueki³

et al. 2010

J. Agric. Food Chem.

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Klason lignin or preacid hydrolysate of a poaceous biomass such as rice husk, rice straw ( Oryza sativa ), and wheat straw ( Triticum aestivum ) became a good source of highly pure silica by simple calcinations in the testing process for application of high-boiling solvent (HBS) pulping of agricultural byproduct. Especially, Klason lignin or preacid hydrolysis residue of rice husks offered highly purified silica, which was converted to an excellent Ni/SiO(2) catalyst for methanation of carbon dioxide. The Ni/SiO(2) catalyst showed superior properties after the following sequential treatments; preacid hydrolysis of rice husks, HBS pulping of the resultant residue, cellulase hydrolysis of the HBS pulp, calcinations of the resultant powder, impregnation of the silica sample with an aqueous solution of nickel nitrate, and final calcinations.

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Section: Resultsmentioning

confidence: 99%

Quality Determination of Nickel-Loaded Silica Prepared from Poaceous Biomass

Ubukata

Mitsuhashi²,

Ueki³

et al. 2010

J. Agric. Food Chem.

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“…This would decrease the environmental load of the FriedelÁCrafts reaction and makes a valued addition to the reaction. With a similar objective we previously reported the use of rice husk silica in the preparation of solid acid catalysts (9).…”

mentioning

confidence: 91%

Preparation of Mg–Al hydrotalcite from the effluent of Friedel–Crafts reaction and its application as a catalyst in Knoevenagel reaction

Kshirsagar

Patil

Samant

2010

Green Chemistry Letters and Reviews

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“…Specifically, RH contain about 20% amorphous silica, which is an ideal raw material for the preparation of silicon-containing catalytic materials [14]. In recent years, the use of RH as a catalyst carrier has attracted extensive attention from researchers [15][16][17][18][19]. Shinde et al [17] have prepared supported metal chlorides and metal oxides by impregnating RH silica with aqueous or organic solutions of FeCl 3 , SbCl 3 , BiCl 3 , and AlCl 3 .…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, the use of RH as a catalyst carrier has attracted extensive attention from researchers [15][16][17][18][19]. Shinde et al [17] have prepared supported metal chlorides and metal oxides by impregnating RH silica with aqueous or organic solutions of FeCl 3 , SbCl 3 , BiCl 3 , and AlCl 3 . Among them, the Sil-Fe-O-120 sample shows good catalytic activity and stability in the Friedel-Crafts benzylation of monosubstituted aromatic compounds.…”

Section: Introductionmentioning

confidence: 99%

The Green Preparation of Mesoporous WO3/SiO2 and Its Application in Oxidative Desulfurization

Zhang,

Liu,

Zhao

et al. 2024

Catalysts

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Recently, supported WO3-based catalysts have been widely used in oxidative desulfurization (ODS) due to their advantages of easy separation, high activity, and being environment-friendly. In this work, supported mesoporous WO3/SiO2 catalysts have been prepared using an incipient-wetness impregnation method with agricultural waste rice husks as both a silicon source and mesoporous template, and phosphotungstic acid as a tungsten source. The effects of different calcination temperatures and WO3 loadings on the ODS performance of samples are studied, and the appropriate calcination temperature and WO3 loading are 923 K and 15.0 wt.%, respectively. The relevant characterization results show that, compared with pure WO3, the specific surface area and mesopore volume of WO3/SiO2 samples are greatly increased. Due to (a) high WO3 loading, (b) high specific surface area, and (c) nanoscale WO3 grains uniformly dispersed on the surface of the mesoporous SiO2 carrier, active sites of WO3/SiO2 catalysts are greatly increased, and their catalytic activities are improved. After the sixth and eighth runs in the ODS of dibenzothiophene and 4,6-dimethyldibenzothiophene, respectively, the WO3/SiO2 catalyst still maintains high catalytic activity (>99.0%) despite the presence of a partial loss of WO3. In addition, with the aid of the UV-Vis technique, the tungsten-peroxo species, the active intermediates in the ODS reaction catalyzed by the WO3/SiO2 catalyst, are captured. Finally, a possible mechanism for the ODS of bulky organic sulfides using the WO3/SiO2 catalyst is proposed.

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Development of Fe‐, Sb‐, Bi‐ and Al‐impregnated silica catalysts using rice husk silica as a support for Friedel–Crafts benzylation of arenes

Cited by 10 publications

References 12 publications

Quality Determination of Nickel-Loaded Silica Prepared from Poaceous Biomass

Quality Determination of Nickel-Loaded Silica Prepared from Poaceous Biomass

Preparation of Mg–Al hydrotalcite from the effluent of Friedel–Crafts reaction and its application as a catalyst in Knoevenagel reaction

The Green Preparation of Mesoporous WO3/SiO2 and Its Application in Oxidative Desulfurization

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