Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (12): 2893-2899.doi: 10.3866/PKU.WHXB20112893

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Synthesis, Characterization of SSZ-33 Molecular Sieves and Their Performance for the Automobile Tailpipe Hydrocarbon Trap

PAN Rui-Li1,2, FAN Wei-Bin3, LI Yu-Ping4, LI Xiao-Feng1, LI Sha1, DOU Tao1,5   

  1. 1. Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, P. R. China;
    2. Institute of Chemicaland Biological Technology, Taiyuan University of Science and Technology, Taiyuan 030021, P. R. China;
    3. Institute of CoalChemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
    4. College of Materials Science and Engineering, TaiyuanUniversity of Technology, Taiyuan 030024, P. R. China;
    5. CNPC Key Laboratory of Catalysis, College of Chemical Engineering,China University of Petroleum-Beijing, Beijing 102249, P. R. China
  • Received:2011-05-23 Revised:2011-08-25 Published:2011-11-25
  • Contact: DOU Tao
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973123).

Abstract: Using N,N,N-trimethyl-8-ammonium tricyclo [,6] decane iodide as a structure directing agent, B-SSZ-33 molecular sieves with an excellent price-performance ratio was successfully synthesized by process control over 3-4 days. The synthesis of Al-SSZ-33 was achieved by a post-modification procedure of B-SSZ-33 molecular sieves in an Al(NO3)3 solution. These materials were characterized in detail by various techniques such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric (TG) analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES), N2 adsorption/desorption, temperature programmed desorption of NH3 (NH3-TPD), and solid state 27Al nuclear magnetic resonance (27Al NMR). The temperature programmed desorption characteristics of toluene for the B-SSZ-33 and Al-SSZ-33 samples were obtained to understand the efficacy of these materials as hydrocarbon traps. The results show that Al-SSZ-33 with framework Al was obtained after the post-modification procedures. Compared with B-SSZ-33, Al-SSZ-33 has a higher acid strength and shows a comparatively higher toluene desorption temperature (Tmax). The presence of extra framework Al and Si species in Al-SSZ-33 modifies its pores and results in a higher desorption end temperature (Tend). Therefore, the synthesized Al-SSZ-33 is a novel catalyst for use as a hydrocarbon trap in automobile tailpipes.

Key words: SSZ-33 molecular sieves, Automobile tailpipe, Process control method, Hydrocarbon trap, Temperature programmed desorption