Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (01): 139-143.doi: 10.3866/PKU.WHXB201210263

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Synthesis of MFI-Type Zeolite Membrane Encapsulated Activated Carbon Particles Using a Modified Seeded Method

JIN Wei-Yang1, CHENG Dang-Guo1, CHEN Feng-Qiu2, ZHAN Xiao-Li1   

  1. 1 Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P. R. China;
    2 Key Laboratory of Biomass Chemical Engineering of Ministry of Education, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, P. R. China
  • Received:2012-08-24 Revised:2012-10-25 Published:2012-12-14
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21176211) and State Key Laboratory of Chemical Engineering of China (SKL-ChE-09D02).

Abstract:

Zeolite membranes with their advantageous separation and catalytic properties can be coated on traditional catalysts to achieve highly effective perfermance. It is difficult to coat zeolite membranes onto activated carbon (AC) particles, a commonly used catalyst support, because of the hydrophobic and rough surfaces of AC. To overcome these shortcomings, a boehmite gel modified seeded method was developed to synthesize MFI-type zeolite membrane encapsulated AC particles. By using the spray-coating process, the boehmite sol precursor was introduced in a gel layer on the AC surface to provide a smooth surface for seed dispersion and a binder for seed fixation. The obtained seed layer was dense and firm even without calcination. After 6 h rotary hydrothermal synthesis, continuous zeolite membrane encapsulated AC particles were obtained. The synthetic membrane type and the composite material morphologies were elucidated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results indicate that MFI-type zeolite membrane has a thickness of 5 μm. For comparison, on AC particles without boehmite gel modification, no continuous membrane forms. Our boehmite gel modified seeded strategy provides an efficient way to prepare zeolite membranes on different inert supports.

Key words: Seeded method, Spray-coating, Boehmite sol, Zeolite membrane, Activated carbon particle

MSC2000: 

  • O643.36