SCI和EI收录∣中国化工学会会刊

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 Liu1,2, Chenye Wang1,2, Xingrui Wang1,2, Chen Zhao1, Huiquan Li1,2, Ganyu Zhu1,2, Jianbo Zhang1,2   

  1. 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 Liu1,2, Chenye Wang1,2, Xingrui Wang1,2, Chen Zhao1, Huiquan Li1,2, Ganyu Zhu1,2, Jianbo Zhang1,2   

  1. 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: 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