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Solvent nature effect in preparation of perovskites by flame pyrolysis: 2. Alcohols and alcohols + propionic acid mixtures

Paper ID Volume ID Publish Year Pages File Format Full-Text
48711 46519 2007 6 PDF Available
Title
Solvent nature effect in preparation of perovskites by flame pyrolysis: 2. Alcohols and alcohols + propionic acid mixtures
Abstract

The effect of either pure alcohols or alcohols + propionic acid mixtures as solvents for the preparation by flame pyrolysis of a standard LaCoO3 catalyst, to be employed for the catalytic flameless combustion of methane, has been investigated. All the catalysts proved very active for the mentioned reaction. Low-MW pure alcohols showed however less suitable than alcohols-propionic acid mixtures, leading to lower perovskite phase purity, less particle size homogeneity and lower specific surface area. The high volatility of the solvent seems to be the major cause, together with the improper behaviour of nitrates (forced by solubility reasons) as perovskite metals precursors. However, the addition of propionic acid to the alcohols allowed to use the acetates as precursors and hence to obtain high perovskitic phase purity, high SSA and uniform particle size. Moreover, the increase of combustion enthalpy of the solvent, through the addition of higher-MW alcohols, leading to progressively higher flame temperature, strongly improved the thermal resistance of the catalyst, without lowering catalytic performance.

Keywords
Perovskites; Flame spray pyrolysis; Methane catalytic flameless combustion
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Solvent nature effect in preparation of perovskites by flame pyrolysis: 2. Alcohols and alcohols + propionic acid mixtures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 72, Issues 3–4, 30 March 2007, Pages 227–232
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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