Calcium-modified hierarchically porous aluminosilicate geopolymer as a highly efficient regenerable catalyst for biodiesel production

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dc.contributor.author Sharma, Sudhanshu
dc.contributor.author Medpelli, Dinesh
dc.contributor.author Chen, Shaojiang
dc.contributor.author Seo, Dong-Kyun
dc.date.accessioned 2015-08-11T17:41:59Z
dc.date.available 2015-08-11T17:41:59Z
dc.date.issued 2015-07
dc.identifier.citation Sharma, Sudhanshu; Medpelli, Dinesh; Chen, Shaojiang and Seo, Dong-Kyun, "Calcium-modified hierarchically porous aluminosilicate geopolymer as a highly efficient regenerable catalyst for biodiesel production", RSC Advances, DOI: 10.1039/C5RA01823D, vol. 5, no. 80, pp. 65454-65461, Jul. 2015. en_US
dc.identifier.issn 2046-2069
dc.identifier.uri dx.doi.org/10.1039/C5RA01823D
dc.description.abstract A new class of highly active solid base catalysts for biodiesel production was developed by creating hierarchically porous aluminosilicate geopolymer with affordable precursors and modifying the material with varying amounts of calcium. For the catalysts containing ≥8 wt% Ca, almost 100% conversion has been achieved in one hour under refluxing conditions with methanol solvent, and the high catalytic activity was preserved for multiple regeneration cycles. Temperature-programed desorption studies of CO2 indicate that the new base catalyst has three different types of base sites on its surface whose strengths are intermediate between MgO and CaO. The detailed powder X-ray diffraction (PXRD) and X-ray photoelectron spectroscopic (XPS) studies show that the calcium ions were incorporated into the aluminosilicate network of the geopolymer structure, resulting in a very strong ionicity of the calcium and thus the strong basicity of the catalysts. Little presence of CaCO3 in the catalysts was indicated from the thermogravimetric analysis (TGA), XPS and Fourier transform infrared spectroscopy (FT-IR) studies, which may contribute to the observed high catalytic activity and regenerability. The results indicate that new geopolymer-based catalysts can be developed for cost-effective biodiesel production. en_US
dc.description.statementofresponsibility by Sudhanshu Sharma et.al
dc.format.extent vol. 5, no. 80, pp. 65454-65461
dc.language.iso en en_US
dc.publisher Royal Society of Chemistry en_US
dc.subject Calcium-modified en_US
dc.subject Hierarchically porous en_US
dc.subject Aluminosilicate en_US
dc.subject geopolymer en_US
dc.subject catalyst en_US
dc.subject biodiesel production en_US
dc.title Calcium-modified hierarchically porous aluminosilicate geopolymer as a highly efficient regenerable catalyst for biodiesel production en_US
dc.type Article en_US
dc.relation.journal RSC Advances


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