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A Remarkable Catalyst Combination to Widen the Operating Temperature Window of the Selective Catalytic Reduction of NO by NH 3
Author(s) -
Zhang Runduo,
Liu Ning,
Luo Zhen,
Yang Wei,
Liang Xin,
Xu Ruinian,
Chen Biaohua,
Duprez Daniel,
Royer Sébastien
Publication year - 2014
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.201402172
Subject(s) - catalysis , selective catalytic reduction , selectivity , yield (engineering) , desorption , process window , operating temperature , materials science , chemistry , chemical engineering , adsorption , inorganic chemistry , organic chemistry , metallurgy , thermodynamics , optoelectronics , physics , lithography , engineering
On the basis of the idea of combining high selective catalytic reduction (SCR) activity, high N 2 selectivity, and broad operating temperature window, we developed a combined catalyst process that was found to be a convenient way to design a highly efficient SCR process for NO with NH 3 . The single catalysts of MnO x –CeO 2 /TiO 2 and V 2 O 5 –WO 3 /TiO 2 as well as combined catalysts with different configurations were fully characterized by XRD, temperature‐programmed reduction of H 2 , and temperature‐programmed desorption of NO/O 2 . In addition, they were tested for the oxidation of NO or NH 3 as well as the SCR of NO with NH 3 . The correlations between combining configurations and SCR activity results were also revealed. Furthermore, fundamental evidences were given for the rational design of the process and its efficiency maximization (assembly order and catalytic bed volume). An adequate configuration, with MnO x –CeO 2 /TiO 2 and V 2 O 5 –WO 3 /TiO 2 active materials, ensures an excellent SCR performance (NO conversion >85 %, N 2 yield >70 %, and decreased N 2 O production) over a wide operating temperature window (from 150 to 400 °C).