Reforming of methane with carbon dioxide over Pt/ZrO2/SiO 2 catalysts - Effect of zirconia to silica ratio

Gunugunuri K. Reddy, Stéphane Loridant, Atsushi Takahashi, Pierre Delichère, Benjaram M. Reddy

研究成果: Article査読

45 被引用数 (Scopus)

抄録

ZrO2/SiO2 mixed oxides with different ratios (2:1 to 4:1) were prepared by a deposition-precipitation method from zirconium hydroxide and colloidal silica and used as supports for platinum nano-particles. The synthesized catalysts along with Pt/ZrO2 reference materials were tested for CH4 reforming with CO2 at a high temperature of 1073 K and at high space velocity. Very high reforming activity was observed for the Pt/ZrO2/SiO2 (4:1) sample among all the prepared catalysts. The effect of zirconia to silica ratio on the physico-chemical properties that determine the catalytic activity has been investigated characterizing all the catalysts after calcination, reduction as well as after reaction with several techniques. From X-ray diffraction patterns, BET and H2 chemisorption measurements, X-ray photoelectron and FTIR spectra, the better catalytic properties of the Pt/ZrO2/SiO2 (4:1) sample have been explained by higher Pt dispersion due to the absence of remaining free silica and the presence of amorphous ZrSiO4 in higher amount. Additionally, a better thermal stability of the prepared ZrO 2/SiO2 supports compared to ZrO2 was evidenced after ageing at 1073 K for 16 h in particular for the ratio 4:1. It also underlines the interest of the preparation method.

本文言語English
ページ(範囲)92-100
ページ数9
ジャーナルApplied Catalysis A: General
389
1-2
DOI
出版ステータスPublished - 2010 12 1
外部発表はい

ASJC Scopus subject areas

  • 触媒
  • プロセス化学およびプロセス工学

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