Reconstruction and recovery of anatase TiO_(2) from spent selective catalytic reduction catalyst by Na OH hydrothermal method  

作　　者：Jinlong Liu Chenye Wang Xingrui Wang Chen Zhao Huiquan Li Ganyu Zhu Jianbo Zhang 

机构地区：[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

出　　处：《Chinese Journal of Chemical Engineering》2023年第8期53-60,共8页中国化学工程学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (52274411);the National Natural Science Foundation of China (51904287);the Innovation Academy for Green Manufacture,Chinese Academy of Sciences (IAGM2022D11)。

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 (TiO_(2)) from spent SCR catalysts was proposed.The process included alkali (NaOH) hydrothermal treatment,sulfuric acid washing,and calcination.Anatase TiO_(2) in spent SCR catalyst was reconstructed by forming Na_(2)Ti_(2)O_(4)(OH)_(2) nanosheet during NaOH hydrothermal treatment and H_(2)Ti_(2)O_(4)(OH)_(2) during sulfuric acid washing.Anatase TiO_(2) was recovered by decomposing H_(2)Ti_(2)O_(4)(OH)_(2) during calcination.The surface pore properties of the recovered anatase TiO_(2) were adequately improved,and its specific surface area (SSA) and pore volume (PV) were 85 m^(2)·g^(-1)and 0.40 cm^(3)·g^(-1),respectively.The elements affecting catalytic abilities(arsenic and sodium) were also removed.The SCR catalyst was resynthesized using the recovered TiO_(2) 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 TiO_(2) from spent SCR catalyst.

关 键 词：TiO_(2)reconstruction Anatase TiO_(2)recovery Pore properties Spent V_(2)O_(5)-WO_(3)/TiO_(2)catalyst 

分 类 号：TQ134.11[化学工程—无机化工] X705[环境科学与工程—环境工程]