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One-pot Synthesis of Hierarchical Mesoporous ZSM-5 from the Assembly of Nanocrystals Using Urea as Additive

Yuanyuan Ma

http://orcid.org/0000-0001-6241-8515

Heilongjiang Provincial Key Laboratory of Catalytic Synthesis for Fine Chemicals, Qiqihar 161006, P. R. China

College of Chemistry, Jilin University, Changchun 130023, P. R. China

E-mail Address: mayuanyuan1219@126.com

Corresponding authors.

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Zhifang Li

College of Materials Science and Engineering, Qiqihar University, Heilongjiang Province, Qiqihar 161006, P. R. China

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Nan Zhao

Analyzing & Testing Center, Qiqihar University, Heilongjiang Province, Qiqihar 161006, P. R. China

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Fuzhong Han

Heilongjiang Provincial Key Laboratory of Catalytic Synthesis for Fine Chemicals, Qiqihar 161006, P. R. China

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, and

Qiubin Kan

College of Chemistry, Jilin University, Changchun 130023, P. R. China

E-mail Address: catalysischina@yahoo.com.cn

Corresponding authors.

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https://doi.org/10.1142/S1793292020500265Cited by:3 (Source: Crossref)

Abstract

A hierarchical mesoporous ZSM-5 catalyst with aggregated nanocrystals structure was one-pot hydrothermally synthesized by using urea as the additive. The crystalline phase, morphology and hierarchical architectures were characterized by the XRD, SEM, TEM and N₂ adsorption/desorption analyses. The nano-aggregates showed MFI crystalline phase and were composed of connected nanoparticles. The samples had the high surface area and the pore volume from intercrystalline among the nanoparticles due to spontaneously stacking of nanocrystals. The pyridine-adsorbed FTIR and the catalytic performances in the alkylation of phenol and tert-butyl alcohol were applied to evaluate the accessibility of acid sites and the catalytic activities for the hierarchical mesoporous ZSM-5 samples. The samples possessed high accessibility of acid sites which resulted from their large amount of mesopores, and its catalytic activity was improved dramatically. The phenol conversion could reach up to 95.6%, and the corresponding selectivity of 4-TBP and 2,4-DTBP was 44% and 51.5%, respectively.

Keywords:

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