Desorption of hydrogen from Ni—Cu—Cr catalyst on (θ + α-Al2O3 sorbent modified with cerium

Kusman Dossumov, Н. М. Попова, R. Kh. Salakhova, Svetlana A. Tungatarova, A. A. Shapovalov, A. K. Umbetkaliev

2010

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DOI 10.1134/s0036024410030234
Data confidence 70 medium
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Abstract

We present the results of thermal desorption studies of H 2 interactions with 8.9% Ni—Cu—Cr (1:3:0.1)/(θ+α)-Al 2 O 3 +2% Ce. It was demonstrated that three forms of hydrogen with different desorption temperatures and T max peak values are formed in the catalyst at 673 K: H 2 (ads), H(ads), and dissolved hydrogen. It was found that upon an increase in the adsorption temperature from 673 to 1173 K, H 2 (ads) and H(ads) remain on the surface (E des = 14.4 kcal/mol, first order desorption reaction, H: Ni = 1.6—1.88) while hydrogen dissolution in the Ni lattice and its copper alloy increases (E des = 32.9 kcal/mol, second order desorption reaction, H: Ni = 2.0).