Hydroisomerization of n-Heptane Over Cr Promoted Pt-bearing H3PW12O40 Catalysts Supported on Dealuminated USY Zeolite

被引：5

作者：

Wei, Ruiping ^{[1
]}

Wang, Jun ^{[2
]}

Xiao, Guomin ^{[1
]}

机构：

[1] Southeast Univ, Sch Chem & Chem Engn, Nanjing 211198, Peoples R China

[2] Nanjing Univ Technol, Coll Chem & Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Peoples R China

来源：

CATALYSIS LETTERS | 2009年 / 127卷 / 3-4期

关键词：

12-Tungstophoric acid; Bimetal catalyst; USY; Hydroisomerization of n-heptane; COMPRISING HETEROPOLY ACID; MOLECULAR-SIEVE; Y-ZEOLITE; ISOMERIZATION; HEXANE; SBA-15;

D O I：

10.1007/s10562-008-9691-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The Pt-bearing H3PW12O40 (PW) catalysts, promoted by Cr or La, supported on dealuminated USY zeolite were prepared and their catalytic activities were evaluated in the hydroisomerization of n-heptane with an atmospheric fixed-bed reactor. The catalysts were characterized by XRD, BET, IR and H-2-chemisorption. The results showed that the dealuminated USY support retained the Y zeolite structure and the PW well kept its Keggin structure in the supported PW catalysts and the doping of Cr or La into the catalysts enhanced the dispersion of Pt on the catalyst surface. The Pt-bearing PW catalysts doped with Cr or La, especially Cr, exhibited much higher catalytic activity and selectivity than the catalysts without dopants. Both the conversion and selectivity were discussed in relation with physicochemical properties of catalysts.

引用

页码：360 / 367

页数：8

共 31 条

[1] HYDROISOMERIZATION AND HYDROCRACKING OF N-ALKANES .2. N-HEPTANE TRANSFORMATION ON A PT-DEALUMINATED Y-ZEOLITE - COMPARISON WITH A PT-Y-ZEOLITE [J].

ALVAREZ, F ;

GIANNETTO, G ;

GUISNET, M ;

PEROT, G .

APPLIED CATALYSIS, 1987, 34 (1-2) :353-365

[2]

ATSUYUKI M, 2004, APPL CATAL A-GEN, V262, P143

[3] Mechanisms of heptane isomerization on bifunctional Pd/H-Beta zeolites [J].

Blomsma, E ;

Martens, JA ;

Jacobs, PA .

JOURNAL OF CATALYSIS, 1996, 159 (02) :323-331

[4] Hydroisomerization of pentane, hexane, and heptane for improving the octane number of gasoline [J].

Chica, A ;

Corma, A .

JOURNAL OF CATALYSIS, 1999, 187 (01) :167-176

[5] Tungstophosphoric and tungstosilicic acids on carbon as acidic catalysts [J].

Chimienti, ME ;

Pizzio, LR ;

Cáceres, CV ;

Blanco, MN .

APPLIED CATALYSIS A-GENERAL, 2001, 208 (1-2) :7-19

[6] ACIDIC ALKALI-METAL SALTS AND AMMONIUM-SALTS OF KEGGIN TYPE HETEROPOLYACIDS AS EFFICIENT SOLID ACID CATALYSTS FOR LIQUID-PHASE FRIEDEL-CRAFTS REACTIONS [J].

IZUMI, Y ;

OGAWA, M ;

NOHARA, W ;

URABE, K .

CHEMISTRY LETTERS, 1992, (10) :1987-1990

[7] In situ infrared study of n-heptane isomerization over Pt/H-beta zeolites [J].

Kondo, Junko N. ;

Yang, Shuwu ;

Zhu, Qingjun ;

Inagaki, Satoshi ;

Domen, Kazunari .

JOURNAL OF CATALYSIS, 2007, 248 (01) :53-59

[8] NEW ACID CATALYST COMPRISING HETEROPOLY ACID ON A MESOPOROUS MOLECULAR-SIEVE MCM-41 [J].

KOZHEVNIKOV, IV ;

SINNEMA, A ;

JANSEN, RJJ ;

PAMIN, K ;

VANBEKKUM, H .

CATALYSIS LETTERS, 1995, 30 (1-4) :241-252

[9] Study of catalysts comprising heteropoly acid H3PW12O40 supported on MCM-41 molecular sieve and amorphous silica [J].

Kozhevnikov, IV ;

Kloetstra, KR ;

Sinnema, A ;

Zandbergen, HW ;

vanBekkum, H .

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 1996, 114 (1-3) :287-298

[10] Characterization of 12-tungstophosphoric acid impregnated on mesoporous silica SBA-15 and its catalytic performance in isopropylation of naphthalene with isopropanol [J].

Liu, QY ;

Wu, WL ;

Wang, J ;

Ren, XQ ;

Wang, YR .

MICROPOROUS AND MESOPOROUS MATERIALS, 2004, 76 (1-3) :51-60

← 1 2 3 4 →