Reconstruction and recovery of anatase TiO2 from spent selective catalytic reduction catalyst by NaOH hydrothermal method

doi:10.1016/j.cjche.2023.03.019

Chinese Journal of Chemical Engineering ›› 2023, Vol. 60 ›› Issue (8): 53-60.DOI: 10.1016/j.cjche.2023.03.019

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Reconstruction and recovery of anatase TiO₂ from spent selective catalytic reduction catalyst by NaOH hydrothermal method

Jinlong Liu^1,2, Chenye Wang^1,2, Xingrui Wang^1,2, Chen Zhao¹, Huiquan Li^1,2, Ganyu Zhu^1,2, Jianbo Zhang^1,2

1. CAS Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2022-11-20 Revised:2023-03-17 Online:2023-10-28 Published:2023-08-28
Contact: Chenye Wang,E-mail:cywang@ipe.ac.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (52274411), the National Natural Science Foundation of China (51904287). and the Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM2022D11). The authors also thank Wang Li in institutional center for shared technologies and facilities of Institute of Process Engineering, Chinese Academy of Sciences for TEM necessary characterizations.

Reconstruction and recovery of anatase TiO₂ from spent selective catalytic reduction catalyst by NaOH hydrothermal method

Jinlong Liu^1,2, Chenye Wang^1,2, Xingrui Wang^1,2, Chen Zhao¹, Huiquan Li^1,2, Ganyu Zhu^1,2, Jianbo Zhang^1,2

1. CAS Key Laboratory of Green Process and Engineering, National Engineering Research Center of Green Recycling for Strategic Metal Resources, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

通讯作者: Chenye Wang,E-mail:cywang@ipe.ac.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (52274411), the National Natural Science Foundation of China (51904287). and the Innovation Academy for Green Manufacture, Chinese Academy of Sciences (IAGM2022D11). The authors also thank Wang Li in institutional center for shared technologies and facilities of Institute of Process Engineering, Chinese Academy of Sciences for TEM necessary characterizations.

Abstract

Abstract: The improper disposal of spent selective catalytic reduction (SCR) catalysts causes environmental pollution and metal resource waste. A novel process to recover anatase titanium dioxide (TiO₂) from spent SCR catalysts was proposed. The process included alkali (NaOH) hydrothermal treatment, sulfuric acid washing, and calcination. Anatase TiO₂ in spent SCR catalyst was reconstructed by forming Na₂Ti₂O₄(OH)₂ nanosheet during NaOH hydrothermal treatment and H₂Ti₂O₄(OH)₂ during sulfuric acid washing. Anatase TiO₂ was recovered by decomposing H₂Ti₂O₄(OH)₂ during calcination. The surface pore properties of the recovered anatase TiO₂ were adequately improved, and its specific surface area (SSA) and pore volume (PV) were 85 m²·g^-1 and 0.40 cm³·g^-1, respectively. The elements affecting catalytic abilities (arsenic and sodium) were also removed. The SCR catalyst was resynthesized using the recovered TiO₂ as raw material, and its catalytic performance in NO selective reduction was comparable with that of commercial SCR catalyst. This study realized the sustainable recycling of anatase TiO₂ from spent SCR catalyst.

Key words: TiO₂ reconstruction, Anatase TiO₂ recovery, Pore properties, Spent V₂O₅-WO₃/TiO₂ catalyst

摘要： The improper disposal of spent selective catalytic reduction (SCR) catalysts causes environmental pollution and metal resource waste. A novel process to recover anatase titanium dioxide (TiO₂) from spent SCR catalysts was proposed. The process included alkali (NaOH) hydrothermal treatment, sulfuric acid washing, and calcination. Anatase TiO₂ in spent SCR catalyst was reconstructed by forming Na₂Ti₂O₄(OH)₂ nanosheet during NaOH hydrothermal treatment and H₂Ti₂O₄(OH)₂ during sulfuric acid washing. Anatase TiO₂ was recovered by decomposing H₂Ti₂O₄(OH)₂ during calcination. The surface pore properties of the recovered anatase TiO₂ were adequately improved, and its specific surface area (SSA) and pore volume (PV) were 85 m²·g^-1 and 0.40 cm³·g^-1, respectively. The elements affecting catalytic abilities (arsenic and sodium) were also removed. The SCR catalyst was resynthesized using the recovered TiO₂ as raw material, and its catalytic performance in NO selective reduction was comparable with that of commercial SCR catalyst. This study realized the sustainable recycling of anatase TiO₂ from spent SCR catalyst.

关键词: TiO₂ reconstruction, Anatase TiO₂ recovery, Pore properties, Spent V₂O₅-WO₃/TiO₂ catalyst

Jinlong Liu, Chenye Wang, Xingrui Wang, Chen Zhao, Huiquan Li, Ganyu Zhu, Jianbo Zhang. Reconstruction and recovery of anatase TiO₂ from spent selective catalytic reduction catalyst by NaOH hydrothermal method[J]. Chinese Journal of Chemical Engineering, 2023, 60(8): 53-60.

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Reconstruction and recovery of anatase TiO₂ from spent selective catalytic reduction catalyst by NaOH hydrothermal method

Reconstruction and recovery of anatase TiO₂ from spent selective catalytic reduction catalyst by NaOH hydrothermal method

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