Premium
Selective Production of Benzene, Toluene and p ‐Xylene (BT p X) from Various C 1‐3 Feedstocks over ZSM‐5/Silicalite‐1 Core‐Shell Zeolite Catalyst
Author(s) -
Miyake Koji,
Hirota Yuichiro,
Ono Kaito,
Uchida Yoshiaki,
Nishiyama Norikazu
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600172
Subject(s) - zeolite , toluene , xylene , benzene , selectivity , catalysis , zsm 5 , isomerization , chemistry , alkylation , p xylene , m xylene , nuclear chemistry , materials science , inorganic chemistry , organic chemistry
Core‐shell zeolite composite crystals consisting of an MFI structure were prepared by a zeolite overgrowth method. The core and shell zeolites are ZSM‐5 with acid sites and silicalite‐1 (Al‐free MFI zeolite) without acid sites, respectively. The structured core‐shell ZSM‐5/silicalite‐1 catalyst was used for the reactions to produce benzene, toluene, and p ‐xylene (BT p X) from five C 1‐3 feedstocks. The selectivity to total BT p X on ZSM‐5/silicalite‐1 (47‐71 C‐mol%) was much higher than uncoated H‐ZSM‐5 (24‐42 C‐mol%) at the conversion of 89–99 % of the reactants (C 1‐3 feedstocks). Furthermore, para ‐selectivity ( p ‐xylene selectivity in xylene isomers) was very high 94–99 C‐mol% compared to the uncoated ZSM‐5 (23‐52 C‐mol%). Both the high BT p X and para selectivities are due to the inhibition of undesirable reactions on the external surface of ZSM‐5 crystals such as alkylation and isomerization. It has shown that this core‐shell structure was very suitable for the BT p X production catalyst.