Open AccessPolyvinyl alcohol templated synthese of hierarchical SAPO-11
Author(s) -
Wenjing Zhao,
Hongxia Yang,
Zhihui Li,
Longli Zhang,
Xufeng Lin,
Hui Fu,
Zhen Liu,
Chuangye Wang
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abac3d
Subject(s) - mesoporous material , polyvinyl alcohol , molecular sieve , catalysis , selectivity , materials science , chemical engineering , high resolution transmission electron microscopy , transmission electron microscopy , desorption , scanning electron microscope , nanotechnology , chemistry , adsorption , organic chemistry , composite material , engineering
This work reports that the polyvinyl alcohol successfully templates the intracrystal mesoporous structure of hierarchical SAPO-11 molecular sieves. The structures of prepared hierarchical SAPO-11 materials and a conventional SAPO-11 simultaneously synthesized are characterized by X-ray diffraction, N 2 adsorption/desorption, scanning electron microscopy and high resolution transmission electron microscopy. The characterizations demonstrate that this synthesized hierarchical SAPO-11 possesses a mesopore structure with a much regular pore size distribution. Importantly, these mesopores are intracrystal but not intercrystal. The bifuntional isomerization catalyst with this hierarchical SAPO-11 as support shows a high selectivity in hydroisomerization reaction of hexane, evidencing that the catalytic selectivity is improved by introduction of mesopore structure into the SAPO-11 crystal. The templating mechanism of polyvinyl alcohol in formation of mesopores is well discussed at the ending. This work provides a potential template to prepare hierarchical catalyst materials.