Fe-doped Beta zeolite from organotemplate-free synthesis for NH3-SCR of NOx

Yongjun Zhu; Bingbing Chen; Rongrong Zhao; Qi Zhao; Hermann Gies; Feng-Shou Xiao; Dirk De Vos; Toshiyuki Yokoi; Xinhe Bao; Ute Kolb; Mathias Feyen; Stefan Maurer; Ahmad Moini; Ulrich Müller; Chuan Shi; Weiping Zhang

doi:10.1039/C6CY00231E

Fe-doped Beta zeolite from organotemplate-free synthesis for NH₃-SCR of NO_x†

Yongjun Zhu,^a Bingbing Chen,^a Rongrong Zhao,^a Qi Zhao,^a Hermann Gies,^b Feng-Shou Xiao,^c Dirk De Vos,^d Toshiyuki Yokoi,^e Xinhe Bao,^f Ute Kolb,^g Mathias Feyen,^h Stefan Maurer,^h Ahmad Moini,ⁱ Ulrich Müller,^h Chuan Shi*^a and Weiping Zhang*^a

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* Corresponding authors

^a State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, Dalian 116024, China
E-mail: chuanshi@dlut.edu.cn, wpzhang@dlut.edu.cn
Tel: +86 411 84986083

^b Institute für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Germany

^c Department of Chemistry, Zhejiang University, Hangzhou 310028, China

^d Centre for Surface Chemistry and Catalysis, K.U. Leuven, Leuven, Belgium

^e Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama, Japan

^f State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian 116023, China

^g Institut für Physikalische Chemie, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany

^h BASF SE, Process Research and Chemical Engineering, 67056 Ludwigshafen, Germany

ⁱ BASF Corporation, Catalysts LLC, Iselin, NJ 08830, USA

Abstract

Two types of Beta zeolites, one from organotemplate-free synthesis with a Si/Al ratio of 9 and the other from a commercial one with a Si/Al ratio of 19, were employed here to dope Fe for NH₃-SCR of NO_x. Fe-Beta (Si/Al = 9) exhibits much higher activity than Fe-Beta (Si/Al = 19), especially at low-temperature regions (<250 °C). In addition, it also exhibits better hydrothermal stability as compared with Fe-Beta (Si/Al = 19), which demonstrates that it is a promising SCR catalyst with good activity as well as hydrothermal stability. The correlation between the quantitative calculation of the content of isolated Fe³⁺ in Beta zeolites and the NO conversion rate at 150 °C shows a linear relationship, suggesting that the isolated Fe³⁺ species affect the SCR activity directly. The higher activity of the Fe-Beta-9 catalyst is supposed to be related not only to the isolated Fe³⁺ but also to the acidity. Furthermore, the template-free synthesized Beta zeolite shows less dealumination during hydrothermal aging and therefore better hydrothermal stability during the SCR reaction.

Catalysis Science & Technology

Fe-doped Beta zeolite from organotemplate-free synthesis for NH₃-SCR of NO_x†

Abstract

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Fe-doped Beta zeolite from organotemplate-free synthesis for NH₃-SCR of NO_x

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