Synthesis and catalytic applications of novel mesoporous aluminosilicate molecular sieves
- Pennsylvania State Univ., University Park, PA (United States)
This paper reports on the synthesis of 4 series of mesoporous aluminosilicate molecular sieves (Al-MCM-41) and their catalytic applications. Four different Al compounds were examined as Al source in the hydrothermal synthesis, including pseudo boehmite (alumina), Al sulfate, Al isopropoxide, and Na aluminate. Each Al source was examined at 3 different feed Si/Al ratios in the synthesis. XRD results show that there are differences in the d{sub 100}-spacings for the samples prepared with different Al sources: Na aluminate > Al isopropoxide < Na aluminate. XRD also indicates that the synthesized Al-MCM-41 samples have different crystallinity. {sup 27}Al NMR and {sub 29}Si NMR reveal that most of the Al species in the samples prepared with pseudo boehmite were present in octahedral coordination, whereas in other samples nearly all the Al species are tetrahedral (in the framework). The acid characteristics of the synthesized molecular sieves were characterized by temperature-programmed desorption of n-butylamine, and by using 1,3,5-triisopropylbenzene hydrocracking as probe reaction. The results of TPD and probe reaction clearly indicate that the Al source used for synthesis has a major impact on the acidic and catalytic properties of Al-MCM-41. The samples prepared with Al isopropoxide and Na aluminate are better as catalysts than those with Al sulfate and pseudo boehmite. They also explored the potential of mesoporous molecular sieves as support for noble metal hydrogenation catalysts and metal sulfide-based hydrotreating catalysts. Pd and Pt-loaded mesoporous molecular sieves were prepared and applied for hydrogenation of naphthalene and phenanthrene. The results show that mesoporous molecular sieve-supported catalysts are much more active than alumina- and titania-supported catalysts. The data for dibenzothiophene hydrodesulfurization suggest that Al-MCM-41 supported Co-Mo may be effective for deep desulfurization of distillate fuels.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Department of the Air Force, Washington, DC (United States)
- OSTI ID:
- 571962
- Report Number(s):
- CONF-961202-; ISBN 1-55899-358-4; TRN: IM9806%%167
- Resource Relation:
- Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1997; Related Information: Is Part Of Advanced catalytic materials -- 1996; Lednor, P.W. [ed.] [Shell Research and Technology Centre, Amsterdam (Netherlands)]; Ledoux, M.J. [ed.] [Univ. of Strasbourg (France)]; Nagaki, D.A. [ed.] [Union Carbide Corp., South Charleston, WV (United States)]; Thompson, L.T. [ed.] [Univ. of Michigan, Ann Arbor, MI (United States)]; PB: 319 p.; Materials Research Society symposium proceedings, Volume 454
- Country of Publication:
- United States
- Language:
- English
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