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

K.G.H. Azzam, Igor V. Babych, Kulathuiyer Seshan, Barbara Mojet, Leonardus Lefferts

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)557-564
JournalChemCatChem
Volume5
Issue number2
DOIs
Publication statusPublished - 2013

Keywords

  • METIS-290716
  • IR-82577

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