Selective catalytic reduction of NOx with NH3: opportunities and challenges of Cu-based small-pore zeolites
Yulong Shan,Jinpeng Du,Yan Zhang,Wenpo Shan,Xiaoyan Shi,Yunbo Yu,Runduo Zhang,Xiangju Meng,Feng-Shou Xiao,Hong He +9 more
TLDR
In this paper, a review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance and synthetic methodology.Abstract:
Zeolites, as efficient and stable catalysts, are widely used in the environmental catalysis field. Typically, Cu-SSZ-13 with small-pore structure shows excellent catalytic activity for selective catalytic reduction of NO x with ammonia (NH3-SCR) as well as high hydrothermal stability. This review summarizes major advances in Cu-SSZ-13 applied to the NH3-SCR reaction, including the state of copper species, standard and fast SCR reaction mechanism, hydrothermal deactivation mechanism, poisoning resistance and synthetic methodology. The review gives a valuable summary of new insights into the matching between SCR catalyst design principles and the characteristics of Cu2+-exchanged zeolitic catalysts, highlighting the significant opportunity presented by zeolite-based catalysts. Principles for designing zeolites with excellent NH3-SCR performance and hydrothermal stability are proposed. On the basis of these principles, more hydrothermally stable Cu-AEI and Cu-LTA zeolites are elaborated as well as other alternative zeolites applied to NH3-SCR. Finally, we call attention to the challenges facing Cu-based small-pore zeolites that still need to be addressed.read more
Citations
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Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis.
Qiang Zhang,Shiqin Gao,Jihong Yu +2 more
TL;DR: The metal-in-zeolite composites as mentioned in this paper have experienced rapid development in heterogeneous catalysis, owing to the combination of the merits of both active metal sites and zeolite intrinsic properties.
Journal ArticleDOI
Unexpected increase in low-temperature NH3-SCR catalytic activity over Cu-SSZ-39 after hydrothermal aging
TL;DR: In this paper, an unexpected phenomenon was observed for Cu-SSZ-39 after hydrothermal aging, where a portion of the Cu2+ ions near double six-membered rings (d6r) transformed into CuxOy species.
Journal ArticleDOI
Microwave synthesis of zeolites and their related applications
Xiaojun Zeng,Xiaojun Zeng,Xudong Hu,Hanbin Song,Guohua Xia,Zong-Yang Shen,Ronghai Yu,Martin Moskovits +7 more
TL;DR: In this paper, a review of microwave technologies for the synthesis of zeolites is presented, including microwave irradiation, microwave assisted aging synthesis, and microwave assisted ionothermal synthesis.
Journal ArticleDOI
Analogous Mechanistic Features of NH3-SCR over Vanadium Oxide and Copper Zeolite Catalysts
Hiroe Kubota,Takashi Toyao,Takashi Toyao,Zen Maeno,Yusuke Inomata,Toru Murayama,Toru Murayama,Naoto Nakazawa,Satoshi Inagaki,Yoshihiro Kubota,Ken-ichi Shimizu,Ken-ichi Shimizu +11 more
Journal ArticleDOI
Inhibition Effect of Phosphorus Poisoning on the Dynamics and Redox of Cu Active Sites in a Cu-SSZ-13 NH3-SCR Catalyst for NOx Reduction.
Anqi Guo,Kunpeng Xie,Huarong Lei,Valentina Rizzotto,Limin Chen,Mingli Fu,Peirong Chen,Yue Peng,Daiqi Ye,Ulrich Simon +9 more
TL;DR: In this article, the deactivation mechanism of a catalytic NOx reduction (NH3-SCR) catalyst by P poisoning was investigated by ex situ examination of the structural changes and by in situ probing the dynamics and redox of Cu active sites via a combination of impedance spectroscopy, diffuse reflection infrared Fourier transform spectrography, and ultraviolet-visible spectrograms.
References
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Journal ArticleDOI
Trends in China's anthropogenic emissions since 2010 as the consequence of clean air actions
Bo Zheng,Bo Zheng,Dan Tong,Meng Li,Fei Liu,Chaopeng Hong,Guannan Geng,Haiyan Li,Xin Li,Liqun Peng,Ji Qi,Liu Yan,Yuxuan Zhang,Hongyan Zhao,Yixuan Zheng,Kebin He,Qiang Zhang +16 more
TL;DR: The authors quantified China's anthropogenic emission trends from 2010 to 2017 and identified the major driving forces of these trends by using a combination of bottom-up emission inventory and index decomposition analysis (IDA) approaches.
Journal ArticleDOI
Excellent activity and selectivity of Cu-SSZ-13 in the selective catalytic reduction of NOx with NH3
TL;DR: In this paper, the performance of a Cu ion-exchanged SSZ-13 zeolite in the selective catalytic reduction (SCR) of NO x with NH 3 was observed, in comparison with Cu-beta and ZSM-5 zeolites.
Journal ArticleDOI
The ammonia selective catalytic reduction activity of copper-exchanged small-pore zeolites
TL;DR: The NH3-SCR activity of small-pore zeolites, such as Cu-SSZ-13 and Cu-SAPO-34, was investigated using a high-throughput reactor system in this article.
Journal ArticleDOI
Dynamic multinuclear sites formed by mobilized copper ions in NO x selective catalytic reduction.
Christopher Paolucci,Ishant Khurana,Atish A. Parekh,Sichi Li,Arthur J. Shih,Hui Li,John R. Di Iorio,Jonatan D. Albarracin-Caballero,Aleksey Yezerets,Jeffrey T. Miller,W. Nicholas Delgass,Fabio H. Ribeiro,William F. Schneider,Rajamani Gounder +13 more
TL;DR: It is demonstrated that under reaction conditions, mobilized Cu ions can travel through zeolite windows and form transient ion pairs that participate in an oxygen (O2)–mediated CuI→CuII redox step integral to SCR.
Journal ArticleDOI
Catalysis in a Cage: Condition-Dependent Speciation and Dynamics of Exchanged Cu Cations in SSZ-13 Zeolites
Christopher Paolucci,Atish A. Parekh,Ishant Khurana,John R. Di Iorio,Hui Li,Jonatan D. Albarracin Caballero,Arthur J. Shih,Trunojoyo Anggara,W. Nicholas Delgass,Jeffrey T. Miller,Fabio H. Ribeiro,Rajamani Gounder,William F. Schneider +12 more
TL;DR: Experimental and theory together reveal that the Cu sites respond sensitively to exposure conditions, and in particular that Cu species are solvated and mobilized by NH3 under SCR conditions.