Pore structure and shape selective catalysis of bifunctional microporous heteropoly compounds

被引：28

作者：

Okuhara, T ^{[1
]}

Yamada, T ^{[1
]}

Seki, K ^{[1
]}

Johkan, K ^{[1
]}

Nakato, T ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Environm Earth Sci, Sapporo, Hokkaido 060, Japan

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 1998年 / 21卷 / 4-6期

关键词：

microporous heteropoly compounds; adsorption of molecule; shape selectivity; hydrogenation of alkenes; skeletal isomerization of n-butane;

D O I：

10.1016/S1387-1811(98)00006-7

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The pore structure of Pt-promoted microporous cesium salts of H3PW12O40 and their shape selective catalysis were studied. Pt-Cs2.1H0.9PW12O40 (0.5 wt% Pt) has only ultramicropores of about 5 Angstrom in width; Pt-CS2.5H0.5PW12O40 (0.5 wt% Pt) possesses mesopores as well as micropores. These were revealed by pore size distributions derived from N-2 adsorption-desorption isotherms and adsorption of a variety of molecules having different sizes. While Pt-Cs2.5H0.5PW12O40 as well as 0.5 wt% Pt/SiO2 were active for hydrogenation of ethylene, cyclohexene, or cyclooctene, only ethylene was hydrogenated over Pt-Cs2.1H0.9PW12O40, indicating that Pt-Cs2.1H0.9PW12O40 exhibits reactant shape selectivity by its constrained pores. In skeletal isomerization of n-butane, the selectivity to isobutane was found to depend significantly on the pore width of Pt-promoted heteropoly compounds and Pt-exchanged zeolites; the selectivity decreased as the pore width became smaller, this is probably due to product shape selectivity. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：637 / 643

页数：7

共 32 条

[1]

Breck D.W, 1974, ZEOLITE MOL SIEVES

[2]

Chen N., 1989, SHAPE SELECTIVE CATA, DOI 10.1016/S0166-9834(00)83323-0

[3] SHAPE-SELECTIVE CATALYSIS IN ZEOLITES [J].

CSICSERY, SM .

ZEOLITES, 1984, 4 (03) :202-213

[4] CATALYSIS BY SHAPE SELECTIVE ZEOLITES - SCIENCE AND TECHNOLOGY [J].

CSICSERY, SM .

PURE AND APPLIED CHEMISTRY, 1986, 58 (06) :841-856

[5] PORE-SIZE DISTRIBUTION IN TYPICAL ADSORBENT SYSTEMS [J].

DOLLIMORE, D ;

HEAL, GR .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1970, 33 (04) :508-+

[6] A NMR TECHNIQUE FOR THE ANALYSIS OF PORE STRUCTURE - APPLICATION TO MATERIALS WITH WELL-DEFINED PORE STRUCTURE [J].

GALLEGOS, DP ;

MUNN, K ;

SMITH, DM ;

STERMER, DL .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1987, 119 (01) :127-140

[7]

Gates BC, 1979, Chemistry of Catalytic Processes

[8] TEST OF NONANE METHOD FOR MICROPORE EVALUATION - USE OF NITROGEN, NORMAL-HEXANE AND CARBON-TETRACHLORIDE AS ADSORPTIVES WITH AMMONIUM PHOSPHOMOLYBDATE, PHOSPHOTUNGSTATE AND SILICOMOLYBDATE AS ABSORBENTS [J].

GREGG, SJ ;

TAYYAB, MM .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1978, 74 :348-358

[9] SELECTIVE AROMATIZATION OF LIGHT PARAFFINS ON PLATINUM-ION-EXCHANGED GALLIUM SILICATE BIFUNCTIONAL CATALYSTS [J].

INUI, T ;

MAKINO, Y ;

OKAZUMI, F ;

NAGANO, S ;

MIYAMOTO, A .

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1987, 26 (04) :647-652

[10] Porous aggregates of unidirectionally oriented (NH4)(3)PW12O40 microcrystallites: Epitaxial self-assembly [J].

Inumaru, K ;

Nakajima, H ;

Ito, T ;

Misono, M .

CHEMISTRY LETTERS, 1996, (07) :559-560

← 1 2 3 4 →