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Different dispersions of group II catalysts over SBA-15 and MCM-41: Effects on transesterification reactivity

Paper ID Volume ID Publish Year Pages File Format Full-Text
49474 46746 2015 4 PDF Available
Title
Different dispersions of group II catalysts over SBA-15 and MCM-41: Effects on transesterification reactivity
Abstract

•SBA-15 supported catalysts are more active than MCM-41 supported analogues.•The effect is independent of the nature of the active phase (Ca/Ba).•It is also independent of the condition of the mesoporous SiO2 and substrate size.•Ba2 + and Ca2 + active phases are more dispersed on SBA-15 than on MCM-41.

Activities of CaO catalysts on SBA-15 and MCM-41 have been compared in transesterification and SBA-15 supported samples are invariably more active than those on MCM-41. Increased activity is not due to diffusional effects (as measured using substrates of differing size) but rather to increased dispersion of CaO on SBA-15 (as measured using NOx TPD). The effect, i.e. increased reactivity of SBA-15 supported catalysts being related to increased dispersion, is also noted in supported BaO catalysts while supported MgCO3 catalysts show little variation in dispersion (or in reactivity) as a function of the support used.

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Keywords
Mesoporous SiO2; Catalyst characterisation; Transesterification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 60, 5 February 2015, Pages 88–91
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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