Citation: ZHANG Pei-shan, MA Bo, YANG Wei-ya, LING Feng-xiang, SHEN Zhi-qi, WANG Shao-jun, HOU Yu-xin. Synthesis and characterization of core-shell Beta/MCM-22 micro-microporous composite zeolites[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(10): 1240-1245. shu

Synthesis and characterization of core-shell Beta/MCM-22 micro-microporous composite zeolites

1.
1. Institute of Chemistry and Material Science, Liaoning University of Petroleum & Chemical Technology, Fushun 113001, China;

Corresponding author: LING Feng-xiang,
Received Date: 25 April 2014
Available Online: 3 July 2014
Fund Project: 中国石油化工股份有限公司资助项目(113038)。 (113038)

With Beta zeolite as the core crystals, core-shell Beta/MCM-22 composite zeolites with uniform morphology were synthesized by a two-step hydrothermal method. The composite zeolites were characterized by XRD, SEM, TEM, N₂-adsorption and FT-IR. The results showed the composite zeolites exhibit uniform structured morphology; Beta and MCM-22 zeolites act as core and shell, respectively. The pore structure of Beta/MCM-22 composite zeolites was between those of MCM-22 and Beta zeolites. The amounts of medium acidic sites and brnsted acidic sites are increased markedly (C_B/C_L = 13.80) in the composite zeolites. The surface energy, Si-OH groups and surficial positive charges of Beta zeolites are enriched through Ar-H₂ plasma surface treatment, which contributes to the formation of uniform core-shell Beta/MCM-22 composite zeolites.
- Beta,
- MCM-22,
- core-shell structure,
- composite zeolites,
- plasma
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