The Effect of Iron Content on the Ammonia Selective Catalytic Reduction Reaction (NH 3 -SCR) Catalytic Performance of FeO x /SAPO-34

Zhaoyang Li, Geng Chen (), Zhenghua Shao, Haonan Zhang and Xiujuan Guo ()
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Zhaoyang Li: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
Geng Chen: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
Zhenghua Shao: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
Haonan Zhang: Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
Xiujuan Guo: School of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China

IJERPH, 2022, vol. 19, issue 22, 1-12

Abstract: Iron-based catalysts are regarded as promising candidates for the ammonia selective catalytic reduction reaction (NH 3 -SCR) which show good catalytic activity at medium and high temperatures, whereas SAPO-34 molecular sieves have a micro-pore structure and are ideal catalyst carriers. In this paper, four FeO x /SAPO-34 molecular sieve catalysts with different iron contents (Fe = 1%, 2%, 3%, 4%) were prepared using an impregnation method. The effect of iron content on the surface properties and catalytic activity was investigated by a series of characterization techniques including XRD, SEM, BET, XPS, H 2 -TPR and NH 3 -TPD. Iron species in the FeO x /SAPO-34 catalysts exist in the form of isolated iron ions or well-dispersed small crystals and iron oxide species clusters. With the addition of iron content, the integrity of CHA (chabazite) zeolite structure remained, but the crystallinity was affected. The FeO x /SAPO-34 catalyst with 3% Fe loading showed a relatively flat surface with no large-diameter particles and strong oxidation-reduction ability. Meanwhile, more acidic sites are exposed, which accelerated the process of catalytic reaction. Thus, the FeO x /SAPO-34 catalyst with 3% Fe showed the best NO conversion performance among the four catalysts prepared and maintained more than 90% NO conversion efficiency in a wide temperature range from 310 °C to 450 °C.

Keywords: selective catalytic reduction; SAPO-34 molecular sieve; iron; nitrogen oxides (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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