Ga^3+改性的中孔TS-1分子筛对乙烷光活化的研究

Photoinduced Activation of Ethane over Ga3+-exchanged Mesoporous TS-1 Zeolites

采用了离子交换法制备Ga^3+改性的中孔TS-1分子筛材料,该材料显示出高的乙烷C-H键光活化活性。实验表明,Ga^3+的引入在反应中起到了活性中心的作用,能够极化乙烷的C-H键;TS-1分子筛骨架中存在的具有光活性的Ti-O链是光诱导乙烷C-H键活化的关键因素,中孔的孔道结构则为乙烷分子C-H键的裂解起到了择型效果,协同提升了光活性乙烷的效果。

Ga3+-modified mesoporous TS-1 zeolites have been successfully prepared by a facile ion-exchanged method.Ga3+-exchanged TS-1 composites show high photoactivities for the cleavage of C-H bond for ethane under the UV irradiation.Further experiments demonstrate that both Ga3+ions and the photoactive Ti-O units of zeolite are crucial for the photo-driven ethane conversion.The highly enhanced activities of Ga3+-TS-1 composites can be attributed to the synergistic effect of Ga3+-induced C-H bond polarization and titania-based photo-redox process.