Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-03-01

Journal: FUEL

Included Journals: EI、SCIE

Volume: 93

Issue: 1

Page Number: 468-472

ISSN: 0016-2361

Key Words: Biodiesel; Calcined sodium silicate; Transesterification mechanism; Solid catalyst

Abstract: Solid calcined sodium silicate (CSS) was successfully used to produce biodiesel from vegetable oil, but its transesterification mechanism is still not well-understood. In this work, stability tests confirmed that some active basic species were leached into methanol from CSS. FT-IR spectra and density functional theory were employed to deduce the mechanistic route of transesterification reactions catalyzed with CSS. It was confirmed that alkaline active species were formed from the ion-exchange between CSS and CH3OH. Deactivated CSS can be reused by regenerating the active sites using a simple method found by us. (C) 2011 Elsevier Ltd. All rights reserved.