Synthesis, characterization and catalytic performance of H 3SiW 12O 40/SiO 2 prepared by sol-gel technique

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Abstract

The purpose of this work is to study the synthesis, characterization, and catalytic performance of two types of solid heteropoly acid catalysts, namely, silicotungstic acid bulk (STAB) and STA-silica sol-gel (STA-SG) compared with sulfuric acid. From the XPS analyses, there was a significant formation of W-O-Si, W-O-W, and Si-O-Si bonding in STA-SG compared to that in STAB. The main spectra of O1s (90.74%, 531.5 eV) followed by other O1s peak (9.26%, 532.8 eV) were due to the presence of W-O-W and W-O-Si bonds, respectively. The STA-SG catalyst was found to be the more environmentally benign solid acid catalyst for the esterification reaction between oleic acid and glycerol due to its lower toxicity supported by silica via sol-gel technique. In addition, the ease of separation for STA-SG catalyst was attributed to its insoluble state in the product phase. The esterification products were then analysed by FTIR and HPLC. Both the H 2SO 4 and the STAB gave high conversion of 100% and 98% but at a lower selectivity of GME with 81.6% and 89.9%, respectively. On the contrary, the STA-SG enabled a conversion of 94% but with a significantly higher GME selectivity of 95%, rendering it the more efficient solid acid catalyst.

Original languageEnglish
Article number507692
JournalJournal of Nanotechnology
DOIs
Publication statusPublished - 2011

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Silicon Dioxide
Sol-gels
Silica
Acids
Catalysts
Esterification
Oleic acid
Oleic Acid
Glycerol
Sulfuric acid
Toxicity
X ray photoelectron spectroscopy
silicotungstic acid

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

@article{a92349d265a84c3681f463ea32181237,
title = "Synthesis, characterization and catalytic performance of H 3SiW 12O 40/SiO 2 prepared by sol-gel technique",
abstract = "The purpose of this work is to study the synthesis, characterization, and catalytic performance of two types of solid heteropoly acid catalysts, namely, silicotungstic acid bulk (STAB) and STA-silica sol-gel (STA-SG) compared with sulfuric acid. From the XPS analyses, there was a significant formation of W-O-Si, W-O-W, and Si-O-Si bonding in STA-SG compared to that in STAB. The main spectra of O1s (90.74{\%}, 531.5 eV) followed by other O1s peak (9.26{\%}, 532.8 eV) were due to the presence of W-O-W and W-O-Si bonds, respectively. The STA-SG catalyst was found to be the more environmentally benign solid acid catalyst for the esterification reaction between oleic acid and glycerol due to its lower toxicity supported by silica via sol-gel technique. In addition, the ease of separation for STA-SG catalyst was attributed to its insoluble state in the product phase. The esterification products were then analysed by FTIR and HPLC. Both the H 2SO 4 and the STAB gave high conversion of 100{\%} and 98{\%} but at a lower selectivity of GME with 81.6{\%} and 89.9{\%}, respectively. On the contrary, the STA-SG enabled a conversion of 94{\%} but with a significantly higher GME selectivity of 95{\%}, rendering it the more efficient solid acid catalyst.",
author = "{Wan Nor Roslam}, {Wan Isahak} and Manal Ismail and Nordin, {N. M.} and {Md Jahim}, Jamaliah and Yarmo, {Mohd. Ambar}",
year = "2011",
doi = "10.1155/2011/507692",
language = "English",
journal = "Journal of Nanotechnology",
issn = "1687-9503",
publisher = "Hindawi Publishing Corporation",

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T1 - Synthesis, characterization and catalytic performance of H 3SiW 12O 40/SiO 2 prepared by sol-gel technique

AU - Wan Nor Roslam, Wan Isahak

AU - Ismail, Manal

AU - Nordin, N. M.

AU - Md Jahim, Jamaliah

AU - Yarmo, Mohd. Ambar

PY - 2011

Y1 - 2011

N2 - The purpose of this work is to study the synthesis, characterization, and catalytic performance of two types of solid heteropoly acid catalysts, namely, silicotungstic acid bulk (STAB) and STA-silica sol-gel (STA-SG) compared with sulfuric acid. From the XPS analyses, there was a significant formation of W-O-Si, W-O-W, and Si-O-Si bonding in STA-SG compared to that in STAB. The main spectra of O1s (90.74%, 531.5 eV) followed by other O1s peak (9.26%, 532.8 eV) were due to the presence of W-O-W and W-O-Si bonds, respectively. The STA-SG catalyst was found to be the more environmentally benign solid acid catalyst for the esterification reaction between oleic acid and glycerol due to its lower toxicity supported by silica via sol-gel technique. In addition, the ease of separation for STA-SG catalyst was attributed to its insoluble state in the product phase. The esterification products were then analysed by FTIR and HPLC. Both the H 2SO 4 and the STAB gave high conversion of 100% and 98% but at a lower selectivity of GME with 81.6% and 89.9%, respectively. On the contrary, the STA-SG enabled a conversion of 94% but with a significantly higher GME selectivity of 95%, rendering it the more efficient solid acid catalyst.

AB - The purpose of this work is to study the synthesis, characterization, and catalytic performance of two types of solid heteropoly acid catalysts, namely, silicotungstic acid bulk (STAB) and STA-silica sol-gel (STA-SG) compared with sulfuric acid. From the XPS analyses, there was a significant formation of W-O-Si, W-O-W, and Si-O-Si bonding in STA-SG compared to that in STAB. The main spectra of O1s (90.74%, 531.5 eV) followed by other O1s peak (9.26%, 532.8 eV) were due to the presence of W-O-W and W-O-Si bonds, respectively. The STA-SG catalyst was found to be the more environmentally benign solid acid catalyst for the esterification reaction between oleic acid and glycerol due to its lower toxicity supported by silica via sol-gel technique. In addition, the ease of separation for STA-SG catalyst was attributed to its insoluble state in the product phase. The esterification products were then analysed by FTIR and HPLC. Both the H 2SO 4 and the STAB gave high conversion of 100% and 98% but at a lower selectivity of GME with 81.6% and 89.9%, respectively. On the contrary, the STA-SG enabled a conversion of 94% but with a significantly higher GME selectivity of 95%, rendering it the more efficient solid acid catalyst.

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