Ga2O3催化剂上CO2气氛中丙烷脱氢反应的研究

考察了Ga2O3对于丙烷脱氢和CO2气氛脱氢反应的催化性能.结果表明,Ga2O3具有较高的催化活性,其性能优于传统的Cr2O3脱氢催化剂.催化反应可能经过了一个丙烷异裂的过程,其中CO2是通过逆水煤气反应和Boudouard反应来促进催化剂性能的,在高于823K时该促进作用更为明显.催化剂的催化活性和其表面酸密度密切相关,在Ga2O3结构中,四配位Ga3+是其酸位的来源,并通过质子与氧化物的共同作用促进反应进行.催化剂的失活是由于表面的积碳和活性氧的消耗共同造成的.同时还对Ga2O3作为丙烷脱氢反应的催化剂的催化反应机理进行了初步探讨.

Photoconductivity of CdS Nanorods/TiOPc Composite Photoconductors

The photoconductive properties of composite photoreceptors based on titanophthalocyanine(TiOPc) and CdS nanorods were sytematically investigated with photoinduced discharge technique. Upon excitation via 570 nm light, the composite photoreceptors showed evident enhancement in photosensitivity(S). A 32% increase in S was observed for a composite in a mass fraction of 5% CdS nanorods with respect to TiOPc component. The electronic structure data of CdS and TiOPc, together with the analysis of the surface photovoltage spectroscopic curves indicated that there existed a process of charge transfer from CdS to TiOPc, which is the mechanism for the sensitization of TiOPc by CdS nanorods, thereby bringing the high photoconductivity of TiOPc component into play. This study provided an example of promising method to improve the performance of opto-electronic devices by inorganic semiconductor materials in nanostructure.