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Modification of the supported Cu/SiO2 catalyst by alkaline earth metals in the selective conversion of 1,4-butanediol to γ-butyrolactone

Paper ID Volume ID Publish Year Pages File Format Full-Text
40687 45862 2012 11 PDF Available
Title
Modification of the supported Cu/SiO2 catalyst by alkaline earth metals in the selective conversion of 1,4-butanediol to γ-butyrolactone
Abstract

The promotion effects of alkaline earth metals (Mg, Ca, Sr, Ba) on the catalytic property of the Cu/SiO2 catalyst for the gas phase dehydrogenation of 1,4-butanediol were investigated. The addition of Ca, Sr or Ba to the Cu/SiO2 catalyst resulted in the improvements of the catalytic activity and the γ-butyrolactone selectivity, and the Cu-Ba/SiO2 catalyst gave 99.6% yield of γ-butyrolactone even after 900 h running. The catalysts were prepared by co-impregnation and characterized by N2 physisorption, X-ray diffraction (XRD), SEM, TEM, H2-temperature programmed reduction (H2-TPR), N2O-decomposition, ammonia temperature-programmed desorption (NH3-TPD), CO2-TPD, XPS, and FTIR spectroscopy of adsorbed pyridine and CO. On the base of the experimental results, two types of copper species on the reduced catalyst were proposed. The Cu° account for the dehydrogenation of 1,4-butanediol, while the electropositive copper species (Cu+) is suggested to be the strong Lewis acid site to catalyze side reactions. The selectivity of γ-butyrolactone was increased with the increasing of the Cu0/Cu+ ratio, and the yield of γ-butyrolactone was increased with copper surface area. The main byproduct 2,3-dihydrofuran may be formed from 1,4-butanediol by the metal/acid–base concerted catalysis.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (168 K)Download as PowerPoint slideHighlights► The promotion effects of alkaline earth metals over the Cu/SiO2 catalyst were studied. ► Cu-Ba/SiO2 exhibited the best performance in 1,4-butanediol dehydrogenation. ► The interaction of the promoter, copper and support were discussed. ► The γ-butyrolactone was generated over the copper surface. ► The byproduct 2,3-dihydrofuran was generated over the metal and acid–basic sites.

Keywords
Alkaline earth metals modified Cu/SiO2; 1,4-Butanediol; γ-Butyrolactone; Dehydrogenation
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Modification of the supported Cu/SiO2 catalyst by alkaline earth metals in the selective conversion of 1,4-butanediol to γ-butyrolactone
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 443–444, 7 November 2012, Pages 191–201
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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Price after discount Only $4.95
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