Adsorptive and catalytic properties in the removal of volatile organic compounds over zeolite-based materials  

沸石分子筛材料在消除挥发性有机化合物反应中的吸附与催化性能（英文）

作　　者：章凌[1] 彭悦欣 张娟[1] 陈龙[2] 孟祥举[1] 肖丰收[1] 

机构地区：[1]浙江大学化学系,浙江省应用化学重点实验室,浙江杭州310017 [2]东华理工大学化学生物与材料科学学院,江西抚州344000

出　　处：《Chinese Journal of Catalysis》2016年第6期800-809,共10页催化学报（英文）

基　　金：supported by the Fundamental Research Funds for the Central Universities(2015XZZX004-04);Zhejiang Provincial Natural Science Foundation(LR15B030001)~~

摘　　要：Volatile organic compounds（VOCs） are a major component in air pollutants and pose great risks to both human health and environmental protection. Currently, VOC abatement in industrial applications is through the use of activated carbons as adsorbents and oxide-supported metals as catalysts. Notably, activated carbons easily adsorb water, which strongly hinders the adsorption of VOCs; conventional oxides typically possess relatively low surface areas and random pores, which effectively influence the catalytic conversion of VOCs. Zeolites, in contrast with activated carbons and oxides, can be designed to have very uniform and controllable micropores, in addition to tailored wettability properties, which can favor the selective adsorption of VOCs. In particular, zeolites with selective adsorptive properties when combined with catalytically active metals result in zeolite-supported metals exhibiting significantly improved performance in the catalytic combustion of VOCs compared with conventional oxide-supported catalysts. In this review, recent developments on VOC abatement by adsorptive and catalytic techniques over zeolite-based materials have been briefly summarized.作为空气污染物的主要成分之一,挥发性有机化合物(VOCs)会极大地破坏生态环境并损害人体健康.在众多消除VOCs的方法中,吸附法由于操作简单、成本低廉的优势而在工业上得以广泛应用.催化燃烧法则因去除效率高,适用范围广且无二次污染等优点被认为是VOCs消除最有效的手段之一.目前,活性炭是最常用的VOCs吸附剂,但存在再生困难、抗湿性差、易燃等诸多问题.与活性炭等常规吸附剂相比,沸石分子筛作为VOCs吸附剂其主要优势在于:(1)沸石分子筛的疏水性可调,通过调控分子筛骨架的硅铝比可以调节分子筛的亲疏水性,高硅铝比的沸石分子筛有着优异的疏水性能,从而可以有效降低在一定湿度条件下水对VOCs分子的竞争吸附;(2)均一的孔径分布可以有效地进行分子识别,从而使吸附剂对VOCs的选择性吸附性大大提高;(3)沸石分子筛一般由硅铝构成,本身不可燃且水热稳定性好,因此能够与微波加热等其他手段相结合以降低吸附剂重生能耗,提高操作安全性;(4)沸石分子筛比表面积大,吸附容量高,是作为蜂窝转轮吸附技术中吸附剂的理想材料,而该技术是目前工业大规模消除VOCs的研究热点.因此,沸石分子筛由于其独特的性质,被视为一种简单高效、选择性好的VOCs吸附剂.现阶段,催化燃烧VOCs所使用的催化剂常用金属氧化物作为载体,但是金属氧化物比表面积相对较小且孔道结构不均一,因此严重影响了催化剂对VOCs的催化燃烧效率,限制了催化燃烧活性的提高.而与金属氧化物载体相比,沸石分子筛材料具有均一的孔道结构以及相对较大的比表面积等优点,而将具有较好吸附选择性和吸附容量的沸石分子筛作为载体,负载活性组分后可以实现催化剂催化燃烧性能的显著提高,从而成为VOCs催化燃烧的理想催化剂.本文综述了目前沸石分子筛材料作为吸附剂和催化剂载体的�

关 键 词：Air pollution Volatile organic compound ZEOLITE Supported catalyst Catalytic combustion 

分 类 号：O643.36[理学—物理化学]