废钒-钛系脱硝催化剂回收利用策略与技术进展

doi:10.11896/cldb.20070110

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Abstract China’s coal based energy structure and more strict NO_X emission standard have led to the extensive application of selective catalytic reduction (SCR) denitration catalyst. Due to chemical deactivation or physical structure damage, a large number of spent SCR catalyst have been produced, which cause serious environmental pollution. On the other hand, the main components of SCR catalysts, such as vanadium, tungsten and titanium, have important economic and strategic value. The wide application of SCR catalyst will led to serious environmental pollution and resource waste.
For the recovery of TiO₂, WO₃, V₂O₅ and other metal elements from waste SCR catalyst, there are mainly acid, alkali and chlorination met-hods. In these processes, vanadium, tungsten, titanium and other metals in the catalyst are transformed into other forms of compounds or dissolved into liquid phase and then separated through oxidation, hydrolysis, crystallization and calcination. The recovered TiO₂ can be used not only as catalyst carrier, but also as coating, photocatalyst and other materials; WO₃, V₂O₅ and MoO₃ can be directly used as raw materials catalyst production or regeneration.
Based on China’s unique situation of coal power situation and vanadium, tungsten, titanium industry, and the concept of future green chemical industry, it is suggested that the recovery process should be considered according to location, time and materials itself. The process optimization is suggested to further develop to improve the product quality and recovery rate, to reduce energy consumption and waste emission.
This review offers a retrospection of the research efforts with respect to recovery of spent vanadium-titanium based SCR catalyst, including acid leaching, alkali leaching, and chlorination process, followed by separation and purification process of vanadium and tungsten. We then pay attention to the problems confronting the current state-of-the-art spent SCR catalyst recovery processes. We have confidence that a life-cycle process of SCR catalyst has a bright future in terms of “Production-Regeneration-Recycling”.

Key words： DeNO_x catalyst recycling SCR titanium oxide vanadium tungsten

Published: 31 August 2021

CLC number:

X789

Fund:National Key R & D Program of China (2019YFC1907500).

About author:: Baodong Wang, professor-level senior engineer, is the Technical Director of Environmental Protection Techno-logy Research Center in National Institute of Clean and Low-carbon Energy. He is engaging in the field of air pollution control research and development. He has led more than ten national and industrial R & D projects. He has been awarded 1 National Patent Silver Award, 4 provincial and ministerial first-class science and technology awards. He has 98 peer-reviewed publications and 110 patents. These technologies have been widely applied in coal-fired power plants and non-power industry for NO_x emission reduction.

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	WANG Baodong
	LIU Zilin
	LIN Dehai
	CAO Zixiong
	HE Faquan
	LU Guangjie
	XIAO Yuting

Cite this article:

WANG Baodong,LIU Zilin,LIN Dehai, et al. A Review on Recovery and Utilization of Spent V₂O₅-WO₃/TiO₂ Catalyst[J]. Materials Reports, 2021, 35(15): 15001-15010.

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http://www.mater-rep.com/EN/10.11896/cldb.20070110 OR http://www.mater-rep.com/EN/Y2021/V35/I15/15001

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