Low CO generation on tunable oxygen vacancies of non-precious metallic Cu/ZnO catalysts for partial oxidation of methanol reaction

•A CO-free hydrogen-rich gas could be achieved on non-precious metallic CuZn-based catalysts with fine-tuning oxygen vacancies.•The concentration of oxygen vacancies can be tuned by adjusting atmosphere and temperature.•Oxygen atoms from POM gases (methanol and oxygen) would easily adsorb onto catal...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2014-05, Vol.150-151, p.506-514
Main Authors: Lee, Kuan-Yi, Huang, Yuh-Jeen
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Catalytic activity
Chemistry
CO-free
Copper
Exact sciences and technology
General and physical chemistry
Methyl alcohol
Non-precious metallic CuZn-based catalyst
Oxidation
Oxygen vacancies
Partial oxidation of methanol (POM)
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Vacancies
Zinc oxide
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Summary:•A CO-free hydrogen-rich gas could be achieved on non-precious metallic CuZn-based catalysts with fine-tuning oxygen vacancies.•The concentration of oxygen vacancies can be tuned by adjusting atmosphere and temperature.•Oxygen atoms from POM gases (methanol and oxygen) would easily adsorb onto catalysts via oxygen vacancies.•Oxygen vacancies could enhance the formation of formate during POM reaction. A simple and inexpensive method is proposed to modulate oxygen vacancies on the non-precious metallic CuZn-based catalyst surface. The identification and quantification of these oxygen vacancies on vZ (ZnO containing oxygen vacancies) and the catalytic activities of CvZ (Cu on ZnO containing oxygen vacancies, ca. 30wt.% Cu and 70wt.% Zn) during partial oxidation of methanol (POM) reaction are discussed. The vZ was calcined in a nitrogen atmosphere at various temperatures (450°C, 500°C and 550°C), and catalytic activities of CvZ catalysts prepared in deposition precipitation (DP) and co-precipitation (CP) and CZr (Cu on ZrO2, ca. 30wt.% Cu and 70wt.% Zr) catalysts were performed. The efficiency of both CP-CvZ-450 and DP-CvZ-450 catalysts are excellent with 100% of CMeOH and 95% of FH2 at 250°C, and 70% of CMeOH and >75% FH2 at 150°C. Significantly, FCO was kept at 0–4% at T
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2013.12.044