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Research on preparation process and denitrification performance over SCR catalyst at low temperature

  • XU Jia-Ming ,
  • HUANG Fu-Lin ,
  • SHI Yu-Ting ,
  • GUO Hong-Fan ,
  • GAO Shi-Qiu ,
  • LI Chang-Ming ,
  • YU Jian
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  • 1. College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China 2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3. Pangang Group research Institute Co., Ltd., State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, Sichuan 617099, China 4. School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China

Received date: 2021-07-30

  Revised date: 2021-11-10

  Online published: 2022-08-02

Abstract

The NH3 selective catalytic reduction (NH3-SCR) technique is the most popular technology for the controlled emission of NOx from industrial flue gas. The key of this technology is to develop catalysts with high activity and low cost at low temperature. In order to meet the needs of industrialization of NH3-SCR catalysts at low-temperature, the catalytic performance of denitration catalysts prepared with the same composition of oxide powder, industrial metatitanic acid and hydrothermal metatitanic acid as precursors was investigated. While catalyst A and B was prepared using industrial metatitanic acid, catalyst C was made from metatitanic acid and hydrothermal metatitanic acid as Ti sources in a certain proportion. In addition, catalyst A and B were prepared by the traditional honeycomb system preparation process, while catalyst C was prepared by an improved process that can be formed in one step, and the surface structure and properties of the catalysts were analyzed by means of X-ray diffraction, N2 adsorption-desorption, thermogravimetric analysis, and mechanical strength. The results showed that catalyst prepared with hydrothermal metatitanic acid was more suitable for industrial applications. It had good low-temperature activity, compressive strength and molding rate. After calcination at 550℃ for 10 h, the longitudinal compressive strength of the catalyst was 1.06 MPa, and the NO conversion rate of the catalyst at 250℃ was 97.79%. In addition, the monolith honeycomb catalyst was evaluated for denitration activity and apparent kinetic analysis, the denitrification performance of the catalyst activity at different flue gas temperatures at a gas velocity of 1~3 m/s was investigated. The results showed that the denitration performance of the catalyst gradually decreased with the increase of gas velocity. According to the Eley-Rideal mechanism, a kinetic equation was established to calculate the reaction rate constant k of the catalyst, and according to the Arrhenius formula, the activation energy of the SCR denitrification reaction of the catalyst C was 32.15 kJ/mol, and the pre-exponential factor was 15.37×103 L/(g?min), which could provide important reference for the design of SCR denitration system in the actual industrial flue gas.

Cite this article

XU Jia-Ming , HUANG Fu-Lin , SHI Yu-Ting , GUO Hong-Fan , GAO Shi-Qiu , LI Chang-Ming , YU Jian . Research on preparation process and denitrification performance over SCR catalyst at low temperature[J]. The Chinese Journal of Process Engineering, 2022 , 22(7) : 863 -872 . DOI: 10.12034/j.issn.1009-606X.221237

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