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Citation: CHEN Ran, NG Yan-Jun, LI Qiang, DOU Tao, ZHAO Zhen, XU Qing-Hu. Direct Synthesis and Characteristics of NH₄-βZeolite with Hierarchical Pore Structure[J]. Acta Physico-Chimica Sinica, ;2009, 25(03): 539-544. doi: 10.3866/PKU.WHXB20090323 shu

Direct Synthesis and Characteristics of NH₄-βZeolite with Hierarchical Pore Structure

1.
China National PetroleumCorporation, Key Laboratory of Catalysis , China University of Petroleum, Beijing 102249, P. R. China

Received Date: 29 October 2008
Available Online: 16 January 2009

NH4-βzeolite with hierarchical porous structure was directly prepared in a nearly neutral synthetic systemusing nonionic compound (polyoxyethylene nonyl phenylether) as the mesoporogen and fluoride as a mineralizer. Samples were characterized by powder X-ray diffractometry (PXRD), scanning electron microscopy (SEM), NH3-temprature programmed desorption (NH3-TPD), N2 adsorption/desorption and differential thermogravimetry (DTG). N2 analysis results showed that the synthesized H-(NH4)-βzeolite contained stepwise distributed micro-mesoporous structure. The Barrett-Joyner-Halenda (BJH) method of analyzing the N2 adsorption isothermshowed that the mesopore volume was 0.67 cm3·g-1 and the most probable pore size was about 21.8 nm. This value was higher than that for the conventional H-βzeolite (0.37 cm3·g-1 and 3.8 nm). The large amount of Lewis acid and the moderate amount of Bronsted acid in the H-(NH4)-β zeolite was examined by means of Pyridine-IR spectroscopy. Compared to conventional H-βzeolite, the conversion in the catalytic cracking reaction of mixed C4 hydrocarbons using this H-(NH4)-βzeolite was improved by 15%. Yields for the olefins (ethene and propene) and aromatic hydrocarbons (benzene and toluene) increased by 10%and 3%, respectively.
- NH4-βzeolite,
- Hierarchical porous structure,
- C4 alkane mixture,
- Catalytic cracking,
- Fluoride mineralizer
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沈阳化工大学材料科学与工程学院沈阳 110142

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Direct Synthesis and Characteristics of NH4-βZeolite with Hierarchical Pore Structure

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通讯作者: 陈斌, bchen63@163.com

Direct Synthesis and Characteristics of NH₄-βZeolite with Hierarchical Pore Structure