Selective Methanol Oxidation to Hydrogen over Ag/ZnO Catalysts Doped with Mono- and Bi-Rare Earth Oxides

The hydrogen production by the catalytic partial oxidation of methanol (POM) over rare earth oxide (RE = La, Dy, Gd, and Ce)-modified ZnO-supported silver catalysts, as well as silver supported on Ce1–x Gd x O y -modified ZnO catalysts, was investigated. The effect of the temperature on the activity...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2014-12, Vol.53 (51), p.19884-19894
Main Authors: AbdelDayem, Hany M, Al-Shihry, Shar S, Hassan, Salah A
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Doping
Methyl alcohol
Oxidation
Oxides
Silver
Zinc oxide
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Summary:The hydrogen production by the catalytic partial oxidation of methanol (POM) over rare earth oxide (RE = La, Dy, Gd, and Ce)-modified ZnO-supported silver catalysts, as well as silver supported on Ce1–x Gd x O y -modified ZnO catalysts, was investigated. The effect of the temperature on the activity was studied in the range between 150 and 400 °C, and the catalyst stability was monitored with time-on-stream (TOS). The addition of rare earth metal oxide promoters resulted in a significant improvement in the catalytic performance. The optimal performance in methanol oxidation was achieved using AgCe20Zn, which exhibited a hydrogen selectivity of 90.8% with 95.2% methanol conversion at 350 °C; however, the catalyst suffered from marked deactivation with TOS. The good stability of the Ag/ZnO catalyst was verified using a gadolinium promoter. Doping of the AgCe20Zn catalyst by Gd greatly enhanced its life span over at least 24 h on-stream and markedly reduced the CO content (down to
ISSN:0888-5885
1520-5045
DOI:10.1021/ie502609z