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Acta Phys. Chim. Sin.  2012, Vol. 28 Issue (06): 1439-1447    DOI: 10.3866/PKU.WHXB201203142
CATALYSIS AND SURFACE SCIENCE     
Synthesis of Combined Micro-Mesoporous Zeolites and Their Application to Automobile Cold Start Emission Control
ZHANG Lan, ZHANG Zhen-Zhong, WEI Ji-Ying, MENG Bi-Fang, JIANG Feng, LIANG Tong-Xiang
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing Key Laboratory of Fine Ceramics, Beijing 100084, P. R. China
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Abstract  Synthesis of micro-mesoporous zeolites β/M (where β and M denote β zeolite and MCM-41 zeolite, respectively) combined with zeolites β and MCM-41 was achieved in the sodium hydroxide system using a two-step hydrothermal treatment method. Sodium aluminate and fume silica were used as the sources of aluminum and silicon, while tetraethylammonium hydroxide (TEAOH) and cetyltrimethylammonium bromide (CTAB) were used as templates for the formation of β crystal seeds and for self-assembling of β crystal seeds into mesoporous zeolites β/M, respectively. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and high resolution transmission electron microscope (HRTEM). Reaction time and particle size of β crystal seeds were found to play an important role in the synthesis of β/M zeolites. When β seeds crystallize in a short time, a pure phase (denoted βM) can result, whose mesoporous structure resembles MCM-41, while long crystallization times can result in a phase mixture of mesoporous βM and microporous β zeolite. Due to the insertion of the secondary building units of β zeolite into the mesoporous wall, the β/M micro-mesoporous combined zeolites showed enhanced toluene adsorption performance and hydrothermal stability.

Key wordsMicro-mesoporous combined zeolite      Crystallization time      Grain size      Toluene adsorption      Automobile cold start emission control     
Received: 31 December 2011      Published: 14 March 2012
MSC2000:  O647.33  
Fund:  

The project was supported by the National Natural Science Foundation of China (21077064).

Corresponding Authors: WEI Ji-Ying     E-mail: weijiying@tsinghua.edu.cn
Cite this article:

ZHANG Lan, ZHANG Zhen-Zhong, WEI Ji-Ying, MENG Bi-Fang, JIANG Feng, LIANG Tong-Xiang. Synthesis of Combined Micro-Mesoporous Zeolites and Their Application to Automobile Cold Start Emission Control. Acta Phys. Chim. Sin., 2012, 28(06): 1439-1447.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201203142     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2012/V28/I06/1439

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