Study of ruthenium supported on Ta2O5-ZrO2 and Nb2O5-ZrO2 as catalysts for the partial oxidation of methane

被引：19

作者：

Choque, Valerio

Homs, Narcis

Cicha-Szot, Renata

de la Piscina, Pilar Ramirez ^{[1
]}

机构：

[1] Univ Barcelona, Dept Inorgan Chem, E-08028 Barcelona, Spain

来源：

CATALYSIS TODAY | 2009年 / 142卷 / 3-4期

关键词：

Partial oxidation of methane; Ta2O5-ZrO2; support; Nb2O5-ZrO2; Supported Ru catalyst; SYNTHESIS GAS; RU/TIO2; CATALYSTS; HYDROGEN; ACIDITY;

D O I：

10.1016/j.cattod.2008.09.013

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Ru-based catalysts supported on Ta2O5-ZrO2 and Nb2O5-ZrO2 are studied in the partial oxidation of methane at 673-873 K. Supports with different Ta2O5 or Nb2O5 content were prepared by a sol-gel method, and RuCl3 and RuNO(NO3)(3) were used as precursors to prepare the catalysts (ca. 2 wt.% Ru). At 673 K high selectivity to CO2 was found. An increase of temperature up to 773 K produced an increase in the selectivity to syngas (H-2/CO = 2.2-3.1), and this is related with the transformation of RuO2 to metallic Ru as was determined from XRD and XPS results. At 873 K and with co-fed CO2 an increase of the catalytic activity and CO selectivity was found. A TOF value of 5.7 s(-1) and H-2/CO ratio ca. 1 was achieved over Ru(Cl)/6TaZr. Catalytic results are discussed as a function of the support composition and characteristics of Ru-based phases. (C) 2008 Elsevier B.V. All rights reserved.

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页码：308 / 313

页数：6

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