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Determination of the basic strength of solid catalysts in water by means of a kinetic tracer

Paper ID Volume ID Publish Year Pages File Format Full-Text
53134 46915 2006 4 PDF Available
Title
Determination of the basic strength of solid catalysts in water by means of a kinetic tracer
Abstract

The kinetic analysis of the isomerization of glucose into fructose in the presence of solid basic catalysts, cation-exchanged zeolites and anion-modified hydrotalcites, has been performed in order to evaluate the basicity of those solids in water as the solvent and under working reaction conditions. A standardization curve is established by plotting the logarithms of the rate constants of isomerization of glucose against pH for a series of sodium hydroxide solutions at different dilutions. It was then possible to calculate the corresponding pH value of solid basic catalysts from the measurement of their reaction rate constants and extrapolation on the previously established standardization plot. For 1 g of catalyst in 50 ml of water, pH values of 11 were calculated for NaA, Na- and Cs-exchanged X zeolites, and hydrotalcite in its carbonated form, whereas the pH value of meixnerite, the hydroxide form of the hydrotalcite precursor, was close to 12.4, thus confirming its higher basic properties. Moreover, from the determination of pH values after a 24 h-pre-equilibrium of solid catalysts in water, it was also possible to evaluate the percentage of the cationic species passed into solution which well agrees with the percentage obtained from elemental analyses.

Keywords
Glucose; Fructose; Isomerization; Cation-exchanged zeolites; Hydrotalcites; Basicity
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Determination of the basic strength of solid catalysts in water by means of a kinetic tracer
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 7, Issue 12, December 2006, Pages 941–944
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
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