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Titolo:
The temperature-programmed desorption of hydrogen from copper surfaces
Autore:
Genger, T; Hinrichsen, O; Muhler, M;
Indirizzi:
Ruhr Univ Bochum, Lehrstuhl Tech Chem, D-44780 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44780 ch Chem, D-44780 Bochum, Germany
Titolo Testata:
CATALYSIS LETTERS
fascicolo: 2-4, volume: 59, anno: 1999,
pagine: 137 - 141
SICI:
1011-372X(1999)59:2-4<137:TTDOHF>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
METHANOL SYNTHESIS; CU/ZNO CATALYSTS; DISSOCIATIVE ADSORPTION; CU CATALYSTS; DYNAMICS; SYSTEMS; CU(110); TOOL; H-2; H2;
Keywords:
Cu/ZnO/Al2O3 catalyst; surface area determination; H-2 temperature-programmed desorption (H-2; TPD);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Muhler, M Ruhr Univ Bochum, Lehrstuhl Tech Chem, D-44780 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44780 -44780 Bochum, Germany
Citazione:
T. Genger et al., "The temperature-programmed desorption of hydrogen from copper surfaces", CATAL LETT, 59(2-4), 1999, pp. 137-141

Abstract

The desorption kinetics of H-2 from a Cu/ZnO/Al2O3 catalyst for methanol synthesis were studied under atmospheric pressure in a microreactor set-up by performing temperature-programmed desorption (TPD) experiments after various pretreatments of the catalyst. Complete saturation with adsorbed atomichydrogen was obtained by dosing highly purified H-2 for 1 h at 240 K and at a pressure of 15 bar. The TPD spectra showed symmetric H-2 peaks centeredat around 300 K caused by associative desorption of H-2 from Cu metal surface sites. H-2 TPD experiments performed with different initial coverages resulted in peak maxima shifting to higher temperatures with lower initial coverages indicating that the desorption of H-2 from Cu is of second order. The microkinetic analysis of the TPD traces obtained with different heatingrates yielded an activation energy of desorption of 78 kJmol(-1) and a corresponding frequency factor of desorption of 3x 10(11) s(-1) in good agreement with the kinetic parameters obtained with Cu(111) under UHV conditions.

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Documento generato il 27/11/20 alle ore 09:46:39