期刊
RSC ADVANCES
卷 11, 期 37, 页码 23045-23054出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra03892c
关键词
-
资金
- National Natural Science Foundation of China [22021004, 21890763]
CuHY catalysts prepared by solid-state ion exchange showed improved selectivity of C8 and trimethylpentanes in isobutane/2-butene alkylation, attributed to the 3d(10)4s(0) valence electron configuration of Cu+ which inhibits oligomerization of 2-butene and indirectly increases the local isobutane/olefin ratio around the acid sites of the catalyst.
CuHY samples prepared by solid-state ion exchange of HY zeolite with CuCl were used as catalysts in isobutane/2-butene alkylation. The results show that both the addition amount of CuCl and the calcination temperature affect the ion exchange degree. Cu+ can be introduced into Y zeolite by replacing H+ in the HY zeolite after the solid-state ion exchange, causing a decrease of the amount of Bronsted acid sites and an increase of that of Lewis acid sites. When taking CuHY as the catalyst in isobutane/2-butene alkylation, the 3d(10)4s(0) valence electron configuration of Cu+ makes it favorable for inhibiting the oligomerization of 2-butene and accelerating the hydride transfer reaction rate by indirectly increasing the local isobutane/olefin ratio around the acid sites of the catalyst. As a result, the selectivity of C8 and trimethylpentanes over CuHY in alkylate are improved compared with those of HY.
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