Stable and efficient Pt–Re/TiO2 catalysts for water-gas-shift: on the effect of Rhenium

Autor:	Kulathuiyer Seshan, Barbara Mojet, Leon Lefferts, Khalid G. Azzam, Igor V. Babich
Přispěvatelé:	Catalytic Processes and Materials, Faculty of Science and Technology
Jazyk:	angličtina
Rok vydání:	2013
Předmět:	Organic Chemistry Inorganic chemistry chemistry.chemical_element Rhenium METIS-290716 Catalysis Water-gas shift reaction Inorganic Chemistry Adsorption chemistry Chemisorption Physical and Theoretical Chemistry Temperature-programmed reduction Platinum IR-82577 Bimetallic strip
Zdroj:	ChemCatChem, 5(2), 557-564. Wiley-VCH Verlag
ISSN:	1867-3880
DOI:	10.1002/cctc.201200492
Popis:	The catalytic performance of Pt–Re/TiO2 catalysts, that is, activity and stability, in single-stage water gas shift reactions was investigated by studying the influence of preparation strategies, Pt/Re molar ratios, and metals contents. Results show that sequential impregnation of Re precursor prior to Pt precursor without intermediate pretreatment is the optimum preparation strategy. The Pt/Re ratio of unity with 0.5 wt. % Pt content resulted in the most significant effect on activity and stability. In situ characterizing of both monometallic and the optimal bimetallic Pt–Re catalysts by means of CO chemisorption, H2 temperature programmed reduction, and FTIR spectroscopy under the reaction conditions provided evidence that Re increases the activity by enhancing the activation of water. No evidence was found for any direct influence of Re on the properties of Pt in the catalyst under the reaction conditions.
Databáze:	OpenAIRE
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