Catalytic role of different pore systems in MCM-49 zeolite for liquid alkylation of benzene with ethylene

Development of hierarchical MCM-49 zeolite with intracrystalline mesopores and improved catalytic performance in liquid alkylation of benzene with ethylene

“…Through investigating the activity of different pore systems (surface pockets, supercages and sinusoidal pores) of MCM-49 zeolite in this reaction, our group found that the coke deposition in the supercages is responsible for the fast deactivation at an early stage of reaction [4]. It is expected that the reaction stability may be improved by introducing uniform intracrystalline mesopores into MCM-49 zeolite.…”

“…30% and the intralayer sinusoidal 10 MR channels for c.a. 10% [4]. Additionally, only the interlayer supercages experience a quick deactivation due to coke deposition, while both of the surface pockets and intralayer sinusoidal 10 MR channels exhibit good reaction stability [4].…”

“…10% [4]. Additionally, only the interlayer supercages experience a quick deactivation due to coke deposition, while both of the surface pockets and intralayer sinusoidal 10 MR channels exhibit good reaction stability [4]. Therefore, in order to improve the reaction stability of MCM-49 zeolite in liquid alkylation of benzene with ethylene, it is necessary to introduce intracrystalline mesopores into MCM-49 zeolite to facilitate the transportation of reactants and products in the interlayer supercage system.…”

Selective removal of 1,2‐propanediol and 1,2‐butanediol from bio‐ethylene glycol by catalytic reaction

“…Differing from H‐Beta 26, the conversions of PDO and BDO over the treated H‐ZSM‐5 28 only decreased by 12.0% and 8.8%, respectively (Supporting Information Figure S6). Because DMQ cannot enter the 10‐membered‐ring micropores of ZSM‐5 zeolites due to its large size . When quinoline (smaller molecules) was added, the activity of H‐ZSM‐5 28 nearly disappeared (Supporting Information Figure S7).…”

Determination of different acid sites in Beta zeolite for anisole acylation with acetic anhydride

“…The external surface acid site concentration of MCM-22 or MCM-49 zeolite could be estimated by selective poisoning with 2,4-DMQ [22,26,[35][36][37][38][39]. It was well accepted that only Brönsted acid sites could be poisoned by 2,4-DMQ but not for Lewis acid sites, due to the steric hindrance between the latter and the 2-position methyl group of 2,4-DMQ molecule [22,26].…”