Influence of different preparation methods on the activity of Ce and Mo co-doped ZSM-5 catalysts for the selective catal
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RESEARCH ARTICLE
Influence of different preparation methods on the activity of Ce and Mo co-doped ZSM-5 catalysts for the selective catalytic reduction of NOx by NH3 Zhifang Li 1 & Jian Yang 1 & Yadong Zhou 2 & Jinxing Cui 1,3 & Yuanyuan Ma 4 & Cui Geng 4 & Yan Kang 4 & Jiayin Liu 5 & Changlong Yang 1 Received: 20 February 2020 / Accepted: 7 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The Ce-doped different MoO3 [conventional molybdenum oxide (con-MoO3) or nano molybdenum oxide (nano-MoO3) and synthetic molybdenum oxide (syn-MoO3)] modification of ZSM-5 catalyst synthesized by different preparation methods (the combination of grinding and ion-exchange method and the combination of impregnation and ion-exchange method) was studied on selective catalytic reduction (SCR) of NOx with NH3. The results demonstrated that the SCR performance of the prepared Cedoped syn-MoO3 modification of ZSM-5 catalyst [Ce(0.9%)-syn-MoO3(6%)/ZSM-5] by the combination of impregnation and ion-exchange method was better than Ce-doped con-MoO3 modification of ZSM-5 [Ce(0.9%)-con-MoO3(6%)/ZSM-5] and Cedoped nano-MoO3 modification of ZSM-5 [Ce(0.9%)-nano-MoO3(6%)/ZSM-5] via the combination of grinding and ionexchange method, especially when the temperature window is 200–350 °C. That is because it is easy to form Mo-O-Al by the smaller sized MoO3 more easily interacting well with Brønsted acid under calcining temperature, which results in the decrease of Brønsted acid sites in the catalyst. Combing with the binding energy of Mo for all the catalysts, the combination of Mo and Al (Mo-O-Al) altered the chemical environment around the Mo species. Furthermore, Ce(0.9%)-syn-MoO3(6%)/ZSM-5 exhibited excellent sulfur resistance. Keywords ZSM-5 . Ce-Mo co-doped . Different synthetic methods . NH3-SCR
Introduction Responsible Editor: Philippe Garrigues * Changlong Yang [email protected] 1
College of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polymeric Composite Material, Qiqihar University, Qiqihar 161006, China
2
Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China
3
College of Materials Science and Engineering, Graphene Functional Materials Research Laboratory, Qiqihar University, Qiqihar 161006, China
4
College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China
5
College of Science, Northeast Agricultural University, Harbin 150030, China
Selective catalytic reduction (SCR) of NOx originating from industrial combustion of fossil fuels and exhaust gases of diesel engines with NH3 is considered one of the most effective methods for satisfying the rapidly evolving environmental regulations worldwide (Chen et al. 2019; Luo et al. 2017; Marberger et al. 2017; Ye et al. 2019). The commercial MoO3-V2O5/TiO2 catalyst has been used in SCR for many years. Nevertheless, there are still many shortcomings, such a
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