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Distribution of Effective Ferrierite Active Sites for Skeletal Isomerization of n ‐Butene to Isobutene
Author(s) -
Liu Wen,
Hu Haiqiang,
Liu Yang,
Zhang Lei,
Xia Chengjie,
Wang Qi,
Ke Ming
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901495
Subject(s) - ferrierite , isomerization , chemistry , catalysis , butene , active site , ammonium , zeolite , stereochemistry , nuclear chemistry , medicinal chemistry , inorganic chemistry , organic chemistry , ethylene
In this study, the effective active sites of aged ferrierite(FER) were confirmed to be located in the 10‐membered ring (10‐MR) pore mouths by modification with ammonium hexafluorosilicate((NH 4 ) 2 SiF 6 )and long‐term experiments. Analysis of SiO 2 /Al 2 O 3 ratios showed that aluminum atoms were selectively removed from the FER surface after the modification with (NH 4 ) 2 SiF 6 . Comparison of the catalytic properties before and after modification showed that the catalytic activity of aged FER depended only on the amount of acid sites located in the 10‐MR pore mouths. Monitoring of the change in acid amount with reaction time and the difference between aged and deactivated FER showed that aged FER retained only weak acid sites, and its deactivation was caused by carbon deposition on the 10‐MR pore mouth acid sites. Therefore, the catalytic performance of FER can be improved by increasing the number of 10‐MR pore mouths.