On the promotion effect of cesium on butadiene epoxidation with Ag/α-Al2O3 catalysts

Dmitry S. Afanasev; Nina I. Kuznetsova; Vladimir I. Zaikovskii

doi:10.1007/s11144-012-0430-8

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Reaction Kinetics, Mechanisms and Catalysis

Volume/Issue:: Volume 106: Issue 1

On the promotion effect of cesium on butadiene epoxidation with Ag/α-Al₂O₃ catalysts

Authors:

Dmitry S. Afanasev

Dmitry S. Afanasev Boreskov Institute of Catalysis, 5 Pr. Lavrentieva, Novosibirsk, Russia, 630090

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Nina I. Kuznetsova

Nina I. Kuznetsova Boreskov Institute of Catalysis, 5 Pr. Lavrentieva, Novosibirsk, Russia, 630090

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, and

Vladimir I. Zaikovskii

Vladimir I. Zaikovskii Boreskov Institute of Catalysis, 5 Pr. Lavrentieva, Novosibirsk, Russia, 630090

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Pages:: 193–202

Online Publication Date:: 18 Mar 2012

Publication Date:: 01 Jun 2012

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s11144-012-0430-8

Keywords:: Silver catalyst; Cesium; Epoxidation; Butadiene

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Abstract

Cs-promoted Ag/α-Al₂O₃ catalysts prepared via thermal decomposition of Ag oxalate or reduction of Ag nitrate have been studied. XRD and hydrogen titration showed an increased Ag dispersion in oxalate-derived catalysts, and TEM revealed a domain structure of Ag particles, with the size of the particles being essentially independent of the conditions of thermal treatments. According to TEM and XRD, the Cs content (500–1,500 ppm) did not influence Ag particle sizes but high Cs loading stabilized the domains during high-temperature treatments. EDX did not reveal enrichment of Ag surface with Cs and indicated predominantly uniform distribution of the promoter, at least in high-loading samples. The yield of butadiene oxide was a strong function of Cs content, and typical volcano-shaped dependence has been observed for catalysts at the steady state. However, the catalysts approached the steady state quite differently, the changes in the yield with time-on-stream being dependent on the Cs loading and catalyst pretreatments. While high-loading samples displayed some activation, the low-loading ones showed deactivation. The reasons are discussed.

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Reaction Kinetics, Mechanisms and Catalysis

Print ISSN:: 1878-5190

Online ISSN:: 1878-5204

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Reaction Kinetics, Mechanisms and Catalysis
Language	English
Size	B5
Year of Foundation	1974
Volumes per Year	1
Issues per Year	6
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	1878-5190 (Print)
ISSN	1878-5204 (Online)