Combined in situ XPS and PTRMS Study of Ethylene Epoxidation Over Silver | Sciact - CRIS-system of Boreskov Institute of Catalysis

Combined in situ XPS and PTRMS Study of Ethylene Epoxidation Over Silver Full article

Journal

Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694

Output data

Year: 2006, Volume: 238, Number: 2, Pages: 260-269 Pages count : 10 DOI: 10.1016/j.jcat.2005.11.043

Tags

Catalyst, Epoxidation, Ethylene, In situ XPS, Oxygen, PTRMS, Silver

Authors

Bukhtiyarov Valerii I. ¹ , Nizovskii Alexander I. ¹ , Bluhm Hendrik ² , Hävecker Michael ² , Kleimenov Evgueni ² , Knop-Gericke Axel ² , Schlögl Robert ²

Affiliations

1	Boreskov Institute of Catalysis, Lavrentieva ave. 5, Novosibirsk, 630090, Russia
2	Fritz-Haber-Institut der MPG, Faradayweg 4-6, Dahlem, Berlin, Germany

Ethylene epoxidation over silver was investigated by combined in situ X-ray photoelectron spectroscopy (XPS) and proton-transfer reaction mass spectrometry (PTRMS) at 300–520 K and 0.07–1 mbar. Ethylene oxide was present among the reaction products at T⩾420 K and p⩾0.3 mbar. The catalytically active surface contains two oxygen species – nucleophilic and electrophilic oxygen. The observed correlation between the abundance of electrophilic oxygen and the yield of ethylene oxide expressed as C2H4O partial pressure indicates that namely this oxygen species oxidizes ethylene to ethylene oxide. Opposite trend is observed for nucleophilic oxygen: the higher is the abundance of this species, the lower is the yield of ethylene oxide. This result is in line with the known fact that because of its oxidic nature, nucleophilic oxygen is active in total oxidation of ethylene to CO2 and H2O. The low activity of silver at T<420 K is caused by the presence of carbonates and carbonaceous residues at the silver surface that reduce the available silver surface area for the catalytic reaction. Reduction of the surface area available for the formation of active species due to accumulation of the embedded oxygen species also explains the decreased rate of ethylene oxide formation with time observed for T⩾470 K.

Bukhtiyarov V.I. , Nizovskii A.I. , Bluhm H. , Hävecker M. , Kleimenov E. , Knop-Gericke A. , Schlögl R.
Combined in situ XPS and PTRMS Study of Ethylene Epoxidation Over Silver

Journal of Catalysis. 2006. V.238. N2. P.260-269. DOI: 10.1016/j.jcat.2005.11.043 WOS Scopus РИНЦ ANCAN OpenAlex

Full text from publisher

Submitted:	Mar 31, 2005
Accepted:	Nov 21, 2005
Published online:	Jan 18, 2006
Published print:	Mar 10, 2006

Web of science:	WOS:000235625100003
Scopus:	2-s2.0-32344440966
Elibrary:	13522863
Chemical Abstracts:	2006:128611
Chemical Abstracts (print):	144:330972
OpenAlex:	W2169073867

DB	Citing
Web of science	120
Scopus	120
Elibrary	117
OpenAlex	131