Temperature-Programmed Desorption and Infrared Spectroscopic Studies of Benzene Adsorption in Zeolite ZSM-5
Temperature-Programmed Desorption and Infrared Spectroscopic Studies of Benzene Adsorption in Zeolite ZSM-5
复制标题
DOI：
10.1021/jp048399r
复制
发表时间：
2004-07
影响因子：
3.3
通讯作者：
N. Sivasankar;S. Vasudevan
中科院分区：
文献类型：
--
作者：
N. Sivasankar;S. Vasudevan
采用傅里叶变换红外（FTIR）-程序升温脱附（TPD）联用技术研究了苯在H-ZSM-5分子筛上的吸附和脱附行为。研究了苯负载量和沸石硅铝比对吸附的影响。FTIR和TPD结果表明，苯在H-ZSM-5分子筛上存在两类吸附中心：Bronsted和非Bronsted吸附中心，非Bronsted吸附中心位于交叉空隙的中心。布朗斯台德网站是吸附的青睐网站，和非布朗斯台德网站上的吸附发生后，这些网站被填满。没有证据表明苯分子吸附在布朗斯台德或非布朗斯台德网站之间的集群或相互作用。
The adsorption and desorption of benzene over the zeolite H-ZSM-5 has been investigated using simultaneous Fourier transform infrared (FTIR)−temperature-programmed desorption (TPD) measurements. The adsorption was studied as a function of benzene loading and the Si/Al ratio of the zeolite. FTIR and TPD confirm the existence of two types of sites for the adsorption of benzene in H-ZSM-5: Bronsted and non-Bronsted sites, with the latter located at the center of the intersection voids. The Bronsted sites are the favored sites for adsorption, and adsorption on the non-Bronsted sites occurs only after these sites are filled. There is no evidence for clustering or interaction between benzene molecules adsorbed on either the Bronsted or non-Bronsted sites.