NiHY型沸石的酸性-还原性及其催化性能研究

ＮｉＨＹ型沸石的酸性－还原性及其催化性能研究傅军，朱崇业，李全芝（复旦大学化学系，上海，２００４３３）关键词ＮｉＨＹ沸石，酸性，还原性，甲苯转化含镍的Ｙ型沸石既有酸功能，也有加氢－脱氢功能，是加氢裂化、临氢异构化和选择重整的优良催化剂。关于ＮｉＮａＹ...

Studies on the Acidity-Reducibility and Catalytic Properties of NiHY Zeolites

The structure, acidity, reducibility of Ni2+.and the reaction of toluene conversion of NiHY zeolite have been studied by using XRD, NH3-TPD, Py-IR, TPR and toluene conversion reaction. It is found that both the number and the strength of acid sites on NiHY zeolite increase with increasing nickel content, and the number of Bronsted acid sites decrease,while the number of Lewis acid sites increase. Otherwise, there are two peaks of H2 consumption, in the range of 573673- K and 973-1073 K, respectively, which appear in TPR spectra of NiHY zeolite, and their area increases with the increase of nickel content. The results of the reaction of toluene conversion over NiHY zeolite indicate that the products of aromatic ring opening and dernethylation increase markedly, while the product of disproportionation decreases greatly with the increase of nickel content in NiHY. Associated with the data of acidity and reducibility of Ni2+, the change of the selectivity of toluene conversion over NiHY zeolite has been discussed.