posted on 2023-12-26, 03:33authored byKe Du, Zhizheng Sheng, He Li, Lou Gao, Tianlan Yan, Jiayu Yu, Di Pan, Zhichao Tan, Songhai Xie, Jing Ju, Yahong Zhang, Yi Tang
Constructing zeolite catalysts with
excellent mass transfer
and
active site accessibility is the key to improving their catalytic
efficiencies. Herein, a zeolite subcrystal catalyst with high short-range
ordering but X-ray amorphism is prepared to minimize the existing
molecular mass-transfer barrier of conventional zeolite catalysts.
Various characterizations confirm its size of smaller than 10 nm,
definite MFI framework, complete opened micropore channel, and abundant
accessible acid sites. Moreover, physical and chemisorption results
reveal that the high short-range ordering MFI zeolite subcrystal possesses
negligible intracrystalline diffuse limitation and utmost accessibility
for the active site. As anticipated, the zeolite subcrystal catalyst
not only demonstrates high cracking efficiency in polyolefin cracking
reactions but also exhibits outstanding catalytic activity and resistance
to carbon deposition in macromolecular furfuryl alcohol etherification
reaction. The controlled MFI zeolite subcrystal catalyst synthesis
strategy is expected to extend to a variety of microporous materials.