Granulated Hierarchical Zeolite Y and Dealuminated Samples Based on It in Pentene Oligomerization.

The catalytic properties of a number of FAU (Y) zeolite samples (microporous zeolite H-Y, granular hierarchical zeolite H-Yh, zeolite H-USYh dealuminated by high-temperature steam treatment (HTST), and zeolite H-USYh a.t. dealuminated by HTST with subsequent acid treatment) in the oligomerization of 1-pentene. The samples were characterized by X-ray fluorescence analysis, X-ray powder diffraction analysis, low-temperature nitrogen adsorption–desorption, scanning electron microscopy, and temperature-programmed desorption of ammonia. It was determined that the total yield of pentene oligomers under the studied conditions (150°С, 10 wt % catalyst, 5 h) decreases in the order H-USYh a.t. (93%) ≈ H-Yh (93%) > H-Y (74%) > H-USYh (70%). The dealuminated sample H-USYh a.t., which has the largest mesopore volume, showed high stability in 1-pentene oligomerization at 180°C. The conversion of the monomer in its presence remained unchanged during 5 cycles of operation without catalyst regeneration, and the yield of pentene oligomers after 5 cycles decreased by 39%. Microporous zeolite H-Y lost activity already after the second cycle. [ABSTRACT FROM AUTHOR]

Copyright of Kinetics & Catalysis is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)