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Intermetallic GaPd 2 Thin Films for Selective Hydrogenation of Acetylene
Author(s) -
Zimmermann René R.,
Siebert Martin,
Ibrahimkutty Shyjumon,
Dittmeyer Roland,
Armbrüster Marc
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202000124
Subject(s) - intermetallic , acetylene , materials science , sputtering , thin film , microstructure , catalysis , selectivity , sputter deposition , analytical chemistry (journal) , chemical engineering , metallurgy , nanotechnology , chemistry , organic chemistry , alloy , engineering
The preparation of single‐phase and catalytically active GaPd 2 coatings was accomplished via DC magnetron sputtering using an intermetallic sputter target. Thin and uniform layers were deposited on borosilicate glass, Si(111) and planar as well as micro‐structured stainless steel foils. The specimens were examined regarding their phase composition, film morphology and microstructure. Thin films of different layer thickness were catalytically characterized in the semi‐hydrogenation of acetylene, which was conducted at 473 K and a feed gas composition of 0.5 vol.% C 2 H 2 , 5 vol.% H 2 as well as 50 vol.% C 2 H 4 in helium. Pre‐reduction of the catalyst was found to be essential to enhance the catalytic selectivity. Sputtered GaPd 2 showed a high selectivity of 73 % for the hydrogenation to ethylene at conversion levels above 80 %. The surface‐specific activity was strongly increased to 8.97 mol acetylene · ( A 0 · h) –1 compared to bulk‐ or nanoscale GaPd 2 (1.93 and 0.30 mol acetylene · ( A 0 · h) –1 , respectively) caused by the high specific surface area of the thin films.