水分对原位漫反射红外光谱表征的影响及其消除  

Influence and Removal of Water on In-Situ DRIFTS Characterization

作　　者：何运兵[1] 纪红兵[1] 徐建昌[1] 王乐夫[1] 

机构地区：[1]华南理工大学化学与化工学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2009年第6期31-36,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20776053);新世纪优秀人才支持计划项目(NCET-06-740)

摘　　要：用原位漫反射傅里叶变换红外光谱(in-situ DRIFTS)研究挥发性有机化合物(VOCs)的催化氧化时,水分的存在严重影响了催化剂上其它物种峰的识别,并对催化反应有一定的抑制作用.文中比较了浓硫酸、无水CaC l2和无水CuSO4、硅胶及5A分子筛对物料中水分的脱除效果,并考察了抽真空对原位池中气相水分脱除的影响.结果发现:温度和所选干燥剂对物料中水分的脱除有很大影响,温度越高,水分影响的消除越容易;5A分子筛的脱水效果最佳,并对催化氧化反应有一定的改善,而其它几种的脱除效果均不理想;此外可通过抽真空的方法来消除或降低气相中水分的影响.In the investigation of the catalytic oxidation of volatile organic compounds （VOCs） using in-situ diffuse reflectance infrared Fourier transform spectroscopy （DRIFTS） , the existence of water greatly influences the recognition of surface species and restrains the catalytic behavior of catalysts. In order to solve this problem, the dehydration effects of concentrated H2SO4, anhydrous CaC12 and anhydrous CuSO4, silica gel, and 5A molecular sieves were compared, and the influence of vacuuming on the removal of gaseous water in the in-situ cell was analyzed. The results show that （ 1 ） temperature and the chosen drier greatly affect the removal of gaseous water; （2） the dehydration becomes easier at a higher temperature; （3） different from other driers, 5A molecular sieves exhibit the most excellent dehydration effect and improves the catalytic oxidation to a certain degree; and （4） vacuuming is feasible in the removal or reduction of gaseous water.

关 键 词：原位漫反射傅里叶变换红外光谱 水分 脱水 分子筛 

分 类 号：TQ032[化学工程] TQ031.7