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Citation: HUO Quan, DOU Tao, NG Yan-Jun, ZHAO Zhen, DENG Feng, YU Zhi-Wu, PAN Hui-Fang. Synthesis and Desulfurization Performance of Nanocrystal-Assembled Zeolite L with a Hierarchical Pore Structure[J]. Acta Physico-Chimica Sinica, ;2010, 26(02): 378-384. doi: 10.3866/PKU.WHXB20100232 shu

Synthesis and Desulfurization Performance of Nanocrystal-Assembled Zeolite L with a Hierarchical Pore Structure

1.
Key Laboratory of Catalysis, China National Petroleum Corporation, China University of Petroleum, Beijing 102249, P. R. China; Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China

Received Date: 26 August 2009
Available Online: 4 January 2010

Zeolite MeLTL with a micro-mesoporous composite pore structure was synthesized by using nanocrystal clusters of zeolite L prepared by the crystallization nurturing method as a precursor and [3-(trimethoxysilyl)propyl] hexadecyldimethylammonium chloride (TPHAC) as the organic mesopore directing surfactant. Several techniques including X-ray diffraction (XRD), nitrogen adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), 27Al magic angle spinning nuclear magnetic resonance (27Al MAS NMR), and Fourier transform infrared spectroscopy of pyridine adsorption (Py-FTIR) were used to characterize the samples. Results show that zeolite MeLTL is formed by the self-assembly of zeolite L nanocrystals, and it has bimodal pore distributions with a stepwise mesoporous structure and the microporous structure of zeolite L. The BET surface area and the pore volume increased significantly and were 611 m2·g-1 and 0.696 cm3·g-1, respectively. Zeolite MeLTL was composed of zeolite L units and this was responsible for the adequate surface acid amount and acid strength. As a result, the pore diffusion ability and the catalytic performance of zeolite MeLTL are enhanced by the improvement in textural properties. For diesel hydrodesulfurization, the catalyst introduced zeolite MeLTL gave better hydrodesulfurization activity compared to the catalysts introduced zeolite L or Al-MCM-41 or used bare γ-Al2O3 as a support. The sulfur content of diesel oil after hydrotreatment was 9.3 μg·g-1 and the desulfurization rate was 99.3%.
- Hydrodesulfurization,
- Zeolite L,
- Micro-mesoporous composite structure,
- TPHAC,
- Diesel oil,
- Hydrogenation catalyst
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