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Study on RuO 2 /SnO 2 : Novel and Active Catalysts for CO and CH 4 Oxidation
Author(s) -
Yu Jing,
Zhao Dan,
Xu Xianglan,
Wang Xiang,
Zhang Ning
Publication year - 2012
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201200038
Subject(s) - thermogravimetric analysis , catalysis , calcination , temperature programmed reduction , scanning electron microscope , differential scanning calorimetry , chemistry , transition metal , inorganic chemistry , materials science , chemical engineering , nuclear chemistry , organic chemistry , physics , engineering , composite material , thermodynamics
RuO 2 /SnO 2 catalysts with 2, 5 and 10 % Ru loadings were prepared with calcined and uncalcined SnO 2 supports by the impregnation method. The catalysts were evaluated for CO and CH 4 oxidation and characterised by N 2 ‐BET, XRD, hydrogen temperature programmed reduction (H 2 ‐TPR), energy‐dispersive X‐ray spectroscopy scanning electron microscopy (EDS‐SEM) and thermogravimetric analysis differential scanning calorimetry (TGA‐DSC). Owing to the synergetic effect between RuO 2 and SnO 2 , all RuO 2 /SnO 2 catalysts are found to be much more active than pure SnO 2 and RuO 2 /Al 2 O 3 for both CO and CH 4 oxidation. For RuO 2 supported on uncalcined SnO 2 , H 2 ‐TPR and TGA‐DSC analysis revealed the formation of a new, less active compound between Sn and Ru that consumed active SnO 2 and RuO 2 , and could be detrimental to the synergism between RuO 2 and SnO 2 , and thus the activity of RuO 2 /SnO 2 catalytic system. As a consequence, it is much less active than RuO 2 supported on calcined SnO 2 . RuO 2 /SnO 2 catalysts are also very stable in the presence of water vapour, which gives them potential for application in after‐treatment processes.