Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 312, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110803
Keywords
Methanol to olefins; Butene conversion; Co-reaction; ZSM-5; ZSM-48 composite; Dual templates
Categories
Funding
- National Natural Science Foundation of China [21875275, 21908151, 51604180]
- Natural Science Foundation of Shanxi Province of China [201801D221092, 201901D111321]
- Youth Innovation Promotion Association CAS [2016161]
- Key Research and Development (R&D) Projects of Shanxi Province [201903D321068]
- Cultivate Scientific Research Excellence Programs of Higher Education Institutions in Shanxi [CSREP2019KJ038]
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ZSM-5/ZSM-48 composite zeolite synthesized using mixed templates of CTAB and HDA shows enhanced catalytic performance with higher propene selectivity and more acid sites.
ZSM-5/ZSM-48 composite zeolite was synthesized via an one-pot method by using mixed templates of cetyltrimethyl ammonium bromide (CTAB) and 1,6-hexamethylenediamine (HDA), and its catalytic performance was tested in methanol-to-olefin reaction (MTO), butene conversion and co-reaction of methanol with butene. The results show that the amount of added CTAB plays a vital role in the synthesis of ZSM-5/ZSM-48 composite zeolite. The increase in the amount of CTAB in the synthesis gels leads to an increase in the content of zeolite with MFI structure, a higher specific surface area, more Al atoms located at channel intersections and more acid sites than ZSM-48 synthesized by the conventional method with HDA as a template. The catalytic results show that ZSM-5/ZSM-48 composite zeolite gives much higher propene selectivity in MTO reaction, butene conversion and co-reaction compared with ZSM-5, ZSM-48 and their mechanical mixtures due to that the combined effect of catalyst acidity and pore structure promotes the olefin-based cycle and inhibits the aromatization and hydride transfer reactions.
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