摘要
介孔硅材料由于具有大的比表面积,均一的孔结构和大的孔径,常被用于分离、吸附和催化等领域.本文综述了近年来国内外介孔硅材料及其负载型催化剂去除各类挥发性有机物(VOCs)的研究进展,主要包括烃类、甲醇、甲醛、丙酮、苯、甲苯、萘、乙酸乙酯等.讨论了介孔硅材料的结构对VOCs吸附过程的影响;介绍了不同催化剂消除各类VOCs的催化性能及反应机理,并重点评述了甲苯在不同催化剂上的研究进展.分析结果表明,介孔硅材料的表面环境、孔道结构以及宏观形貌是影响VOCs分子在介孔硅材料上吸附的主要因素;贵金属催化剂的应用需要提高其抗中毒性以及降低成本;过渡金属的研究应着重于研发高活性的负载型过渡金属复合氧化物催化剂.最后对国内外介孔硅材料及其负载型催化剂的发展进行了展望,今后催化剂的设计可以从"氧化硅载体"和"介孔孔道"两个方面展开,这将为设计合适的催化剂处理各类VOCs污染物提供一定参考.
Mesoporous silica materials have attracted much attention because of their large surface area,uniform pore-size distribution, large pore size, and wide potential applications in the fields of separation,adsorption, and catalysis. The progress in the removal of volatile organic compounds（VOCs, mainly containing hydrocarbons, methanol, formaldehyde, acetone, benzene, toluene, naphthalene, and ethyl acetate） by mesoporous silica materials and supported catalysts in recent years is reviewed. The effect of the structure of mesoporous silica materials on the adsorption of VOCs is discussed. We also discuss the catalytic performance and reaction mechanism for catalytic VOC oxidation over supported catalysts. The recent developments in catalytic combustion of toluene are examined in detail. We found that the surface environment, pore structure, and morphology of mesoporous silica materials are the main factors influencing adsorption of VOC molecules. The application of noble metal catalyst focuses on improving poison resistance and reducing cost. The research on non-noble metal catalysts focuses on developing supported mixed-metal oxide catalysts with high activity. Future developments of mesoporous silica materials and supported catalysts are highlighted. The design of the catalyst can be carried out from two aspects： the silica support and the mesoporous channel. This review will be helpful in choosing an appropriate catalyst for the removal of VOCs with high activity and stability.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2015年第9期1633-1646,共14页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(21507086
21507109)
上海市青年科技英才扬帆计划(14YF1409900)
上海高校青年教师资助计划(ZZSLG14014)
沪江基金研究基地专项(B14003
D14004)
江苏省高校自然科学研究面上项目(15KJB610016)
工业生态与环境工程教育部重点实验室开放基金(KLIEEE-14-08)资助~~
关键词
介孔硅材料
负载型催化剂
挥发性有机物
吸附
催化氧化
贵金属
非贵金属
Mesoporous silica material
Supported catalyst
Volatile organic compound
Adsorption
Catalytic oxidation
Noble metal
Non-noble metal
