Preparation of Spherical Mordenite Zeolite Assemblies with Excellent Catalytic Performance for Dimethyl Ether Carbonylation

ACS Applied Materials & Interfaces
Lingyun LiZhongmin Liu

Abstract

Millimeter-sized spherical mordenite (MOR) zeolite with good mechanical strength was successfully prepared via vapor-assisted transformation of Na- and Al-doped SiO2 spheres. It is demonstrated that the precursor prepared by vacuum impregnation is essential for the achievement of well-retained morphology; the presence of organic amine (such as TEAOH, TMAOH, and HMI) in the vapor can help promote the crystallization, avoid the core-shell morphology, and improve the zeolite Si/Al ratio, although the MOR crystal morphology in the spherical products varies with the choice of organic amines. The resultant MOR-TEAOH spheres, which were synthesized under the assistance of TEAOH, possess large amount of Brønsted acid sites in the 8-MR side pockets (0.76 mmol/g), which is about 3 times higher than in the 12-MR main channels. The preferential siting of H+ sites in the 8-MR helps MOR-TEAOH show excellent catalytic performance in the DME carbonylation reaction. A 90% of DME steady conversion is observed on MOR-TEAOH, which is obviously higher than that on commercial sample (23%). This work offers millimeter-scale spherical MOR with good mechanical strength and excellent catalytic performance, which is very promising for the industrial appl...Continue Reading

References

Jan 31, 2006·Angewandte Chemie·Patricia CheungEnrique Iglesia
Apr 3, 2007·Journal of the American Chemical Society·Aditya BhanEnrique Iglesia
Jan 19, 2016·Chemistry : a European Journal·Veronika PashkovaJiří Dědeček

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Citations

Jan 5, 2019·Chemical Communications : Chem Comm·Xiaobo FengNoritatsu Tsubaki
Feb 25, 2020·Chemical Communications : Chem Comm·Zhiping XiongWenjie Shen
May 7, 2020·Physical Chemistry Chemical Physics : PCCP·Ying LiXinbin Ma
Feb 11, 2021·ACS Applied Materials & Interfaces·Máté ErdősOthonas A Moultos

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