Green, efficient and economical coal fly ash based phosphomolybdic acid catalysts: preparation, characterization and application

Malpani, Sakshi Kabra; Goyal, Deepti; Katara, Stuti; Rani, Ashu

doi:10.1007/s11696-020-01501-x

Cited by 6 publications

(4 citation statements)

References 64 publications

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“…The absence of bands around 1540 and 1440 cm −1 reveals no sign of Bronsted and Lewis acidity in perlite and TAP [55]. The Bronsted acidic sites were obtained at 1545 cm −1 , whereas the Lewis acidic sites were obtained at 1445 cm −1 [56][57][58][59]. After an increase in sulfur content, the number of Lewis and Brønsted acid sites also increased [60].…”

Section: Characterizationmentioning

confidence: 95%

Vapor Phase Alkylation of Isomeric Cresols with Tert-Butyl Alcohol over Perlite Supported Sulfated Zirconia Catalyst

Malpani¹,

Goyal

Chinnam

et al. 2022

Sustainability

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In the present study, perlite was thermally activated and then modified desirably to generate super acidity by loading different weight percentages of sulfated zirconia (SZ) via the two-step sol-gel method. As-prepared sulfated zirconia perlite (SZP) catalysts showed suitable catalytic potential in the vapor phase alkylation of o, m, and p-cresols with tert-butyl alcohol. The presence of crystalline phases in SZP catalysts was confirmed by XRD and FT-IR studies. TEM images revealed the nano size of the catalysts in the range of 9–25 nm. The presence of SZ on the surface of perlite was further confirmed by N2 adsorption–desorption, SEM, SEM-EDX, TGA, and UV-Vis DRS techniques. The pyridine FT-IR results confirmed the existence of Brønsted, Lewis acidic sites and their combination as super acidic catalytic active centers on the surface of catalyst utilized in the vapor phase alkylation of o, m, and p-cresols with tert-butyl alcohol. The regeneration and reusability of the preferred catalyst until the 5th reaction cycle without any considerable loss in catalytic activity demonstrated the stability of the catalyst. Comparative studies show that SZP can be regenerated and is superior compared to other catalysts previously used for other alkylation reactions with the potential for use on a large scale.

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Section: Characterizationmentioning

confidence: 95%

Vapor Phase Alkylation of Isomeric Cresols with Tert-Butyl Alcohol over Perlite Supported Sulfated Zirconia Catalyst

Malpani¹,

Goyal

Chinnam

et al. 2022

Sustainability

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“…Thus, researchers need to look into these solid wastes because of the negative impacts they have on the environment and the lack of adequate policies regarding their disposal and conversion to useful products. The potential of these solid wastes have been explored in new areas such as in synthesis of zeolites [20][21][22], acid & base catalyst [23,24], mesopororus materials [25,26], etc.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Silica from Different Solid Wastes and Its Application as Catalyst Support for Vapour Phase Oxidation of Aromatic Hydrocarbon

SHARMA,

Meena,

Parashar

et al. 2023

ajc

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In present study, the research work has been divided into two sections viz. Firstly, amorphous silica was extracted from different silica rich agricultural and industrial waste materials (fly ash, perlite and rice husk ash) via sol-gel method. The extracted silica (RHA-Si, Perlite-Si, FA-Si) was characterized using BET surface area, FESEM, EDS, XRD, NMR and FTIR techniques. The surface area and particle size of extracted silica was found to be 23.06-255.5 m2/g and 61-267 nm. Secondly, fly ash silica was used as catalyst support and modified desirably by loading different molybdenum weight percentages via acid impregnation method. The presence of MoO3 on the surface of extracted silica were confirmed by different characterization techniques. The kinetic studies of the FASi/Mo-15 catalyst for the vapour phase oxidation of benzene was also investigated by employing the Mars Van Krevelen model to analyze the reaction mechanism and rate of the process. The vapour phase oxidation reaction follows zero order kinetics, with faster benzene conversion occurring at lower intake concentrations and higher reaction temperatures.

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“…Iron incorporated on silica was used as a catalyst for benzoylation of p ‐xylene at the solid–liquid interface, [ 26 ] nickel/fly ash catalyst was used for sorbitol conversion to glycols. [ 27 ] Previously our research group has synthesized effective solid catalysts based on coal‐generated solid waste, fly ash, [ 28–32 ] and perlite. [ 1 ] Since esterification is a very useful reaction with valuable industrial prospects but at mass scale it takes place via conventional methods.…”

Section: Introductionmentioning

confidence: 99%

Perlite Supported Cobalt Oxide Catalyst for a Series of Liquid‐Phase Esterification Reactions

Goyal

Saikia²,

Hada

et al. 2022

Macromolecular Symposia

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Thermally activated perlite-supported cobalt oxide (Co-TAP) catalyst has been synthesized via the deposition-precipitation method. FTIR peaks at around 663 and 565 cm -1 and XRD peaks arise from diffraction of FCC planes of CoO crystals confirm the presence of Co 3 O 4 crystallites on Co-TAP surface. UV-Vis DRS studies reveal the presence of octahedrally coordinated Co 3+ and tetrahedrally coordinated Co 2+ ions. EDX analysis of Co-TAP clearly shows the enhanced percentage of silica and cobalt oxide. All characterization studies suggest the presence of Lewis acidic sites on Co-TAP which have been utilized in a series of liquid-phase esterification reactions of benzoic acid with various alcohols over three different reaction media (conventional, microwave, and sonication). The reactions are carried out in one-pot, single-step, solvent-free reaction conditions, and the catalyst is filtered easily, regenerated, and reused up to five reaction cycles with analogous efficiency suggesting that acidic sites of the catalyst remain stable in all reaction mediums. The stability of regenerated Co-TAP catalyst after the fifth reaction cycle is confirmed by FTIR spectrum which resembles the FTIR of fresh catalyst.

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Green, efficient and economical coal fly ash based phosphomolybdic acid catalysts: preparation, characterization and application

Cited by 6 publications

References 64 publications

Vapor Phase Alkylation of Isomeric Cresols with Tert-Butyl Alcohol over Perlite Supported Sulfated Zirconia Catalyst

Vapor Phase Alkylation of Isomeric Cresols with Tert-Butyl Alcohol over Perlite Supported Sulfated Zirconia Catalyst

Extraction of Silica from Different Solid Wastes and Its Application as Catalyst Support for Vapour Phase Oxidation of Aromatic Hydrocarbon

Perlite Supported Cobalt Oxide Catalyst for a Series of Liquid‐Phase Esterification Reactions

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