Citation: TANG Hao, LU Qiang, YANG Jiang-yi, LI Hui, LI Wen-yan, YANG Yong-ping. Research on recycling and characterization analysis of the waste SCR catalyst[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(2): 233-242. shu

Research on recycling and characterization analysis of the waste SCR catalyst

National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China

Corresponding author: LU Qiang, qianglu@mail.ustc.edu.cn.
Received Date: 30 August 2017
Revised Date: 16 December 2017

Fund Project: Fundamental Research Funds for the Central Universities 2015ZZD02the Major State Basic Research Development Program of China 2015CB251501the Major State Basic Research Development Program of China 973 projectThe project was supported by the Major State Basic Research Development Program of China (973 project, 2015CB251501), Beijing Nova Program (Z171100001117064) and Fundamental Research Funds for the Central Universities (2016YQ05, 2015ZZD02)Fundamental Research Funds for the Central Universities 2016YQ05Beijing Nova Program Z171100001117064

Figures(10)

In the light of a high SO₂ oxidation ratio of the recycled waste SCR catalyst during conventional recycling denitrification, a novel recycling technique, including acid washing, acid leaching under reduction condition and active components loading, was proposed to control the SO₂ oxidation ratio of the recycled catalyst.The experiments were performed to determine the components, denitrification efficiency and SO₂ oxidation ratio of the catalysts obtained in different recycling runs, and the catalysts used were characterized.The results indicate that the denitrification efficiency and SO₂ oxidation ratio of the fresh catalyst, waste catalyst, conventional recycled catalyst and novel recycled catalyst are 99.0% and 0.43%, 77.0% and 0.46%, 94.2% and 0.80%, 99.3% and 0.48%, respectively.Through novel recycling method, both denitrification efficiency and SO₂ oxidation ratio of the recycled catalyst are well recovered.The characterization results suggest that the highly polymerized vanadium species on the surface of the waste catalyst could not be removed by using conventional recycling method, but the novel recycling method is effective for removing these vanadium species and replacing them with highly dispersed vanadium species, resulting in a reduction of SO₂ oxidation ratio of the recycled catalyst.
- catalyst,
- waste,
- recycling,
- SO₂ oxidation
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