铝溶胶对VOCs催化氧化整体式催化剂力学性能及热稳定性影响  

Effect of aluminum sols on mechanical properties and thermal stability of monolithic catalysts for VOCs catalytic oxidation

作　　者：梁浩源 曲振平[1] LIANG Haoyuan;QU Zhenping(School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学环境学院,辽宁大连116024

出　　处：《大连理工大学学报》2024年第6期565-572,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(21876019,22276022).

摘　　要：采用浸渍法制备整体式催化剂时,活性组分在催化剂载体表面的力学性能和热稳定性是评价其能否实现商业化应用的关键因素.采用铝溶胶作为溶剂配制活性组分浸渍液,可提高挥发性有机物(VOCs)整体式催化剂的力学性能和热稳定性.铝溶胶通过在拟薄水铝石(AlOOH)中滴加硝酸形成.考察了AlOOH添加量、n(H^(+)/AlOOH)、溶胶形成的温度和时间对催化剂稳定性的影响.结果表明,选用AlOOH添加量为6%、n(H^(+)/AlOOH)=0.9、常温溶胶5min制备的铝溶胶配制浸渍液涂覆到堇青石表面制得的整体式催化剂具有最佳力学性能,在超声振荡4h后,涂层脱落率仅为0.0396%,远低于未添加铝溶胶制备的催化剂(2.7%).此外,在600℃下热处理4h后,t90仅下降10℃,说明其具有良好的热稳定性.The key factors used to determine whether impregnated monolithic catalysts can be applied commercially are the mechanical properties and thermal stability of the active components on the catalyst carrier surface.The mechanical properties and thermal stability of the monolithic catalyst for volatile organic compounds(VOCs)have been improved by using aluminum sols as solvent to prepare the active component impregnating solution.Nitric acid is added dropwise to the pseudo-boehmite(AlOOH)to prepare the aluminum sols.The effects of AlOOH content,n(H^(+)/AlOOH),sol formation temperature and time are studied in relation to the stability of the catalyst.The findings demonstrate that the monolithic catalyst prepared by aluminum sols impregnating on cordierite surface has the best mechanical properties,in which aluminum sols are prepared with 6%of AlOOH when n(H^(+)/AlOOH)is 0.9 and the sols formation time is 5 min at room temperature.The coating losing rate is just 0.0396%after 4 h of ultrasonic shaking,which is significantly less than the rate(2.7%)for the catalyst made without the inclusion of aluminum sols.Additionally,t 90 only drops by 10℃after heat treatment at 600℃for 4 h,demonstrating its good thermal stability.

关 键 词：铝溶胶 整体式催化剂 力学性能 热稳定性 

分 类 号：X51[环境科学与工程—环境工程]