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Effects of preparative parameters on the structure and performance of Ca–La metal oxide catalysts for oil transesterification

Paper ID Volume ID Publish Year Pages File Format Full-Text
42231 45916 2010 8 PDF Available
Title
Effects of preparative parameters on the structure and performance of Ca–La metal oxide catalysts for oil transesterification
Abstract

The effects of preparative parameters on the surface basicity, composition, and transesterification activities of several Ca–La metal oxide catalysts were investigated. Four different preparation methods: ammonia–ethanol–carbon dioxide precipitation, physical mixing, impregnation, and co-precipitation, were studied. It was found that the ammonia–ethanol–carbon dioxide precipitation method resulted in the highest BET specific surface area, base strength and base site concentration. Moreover, catalyst surface composition and basicity are a function of calcination temperature, precipitants, pH, and molar ratio of Ca to La in precursor solution, and storage conditions. XRD, XPS, basicity and BET tests revealed that catalyst structure and dispersion of Ca species strongly influenced the catalyst activity. High surface concentration of Ca species, strong base strength and high concentration of base sites, and high specific surface area are characteristics of an active transesterification catalyst.

Graphical abstractA sequential precipitation method with ammonia solution, ethanol and carbon dioxide as precipitants for solid base catalyst preparation has been developed. A cooperative effect among the precipitants contributes to a high BET specific surface area, base strength and base site concentration. The catalyst shows a higher catalytic activity in oil transesterification than those prepared by physical mixing, impregnation and co-precipitation methods.Figure optionsDownload full-size imageDownload high-quality image (137 K)Download as PowerPoint slide

Keywords
Biodiesel; Transesterification; Solid base catalyst; Preparation method; Calcination; Precipitant
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Effects of preparative parameters on the structure and performance of Ca–La metal oxide catalysts for oil transesterification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 373, Issues 1–2, 31 January 2010, Pages 104–111
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us