Synthesis of HFC-134a over CrF3/AlF3 catalysts

被引：19

作者：

Lu, JA ^{[1
]}

Yang, H ^{[1
]}

Chen, SK ^{[1
]}

Shi, L ^{[1
]}

Pen, JG ^{[1
]}

Li, HL ^{[1
]}

Peng, SY ^{[1
]}

机构：

[1] XIAN MODERN CHEM RES INST,XIAN 710065,SHAANXI,PEOPLES R CHINA

来源：

CATALYSIS LETTERS | 1996年 / 41卷 / 3-4期

关键词：

AlF3; supports; CrF3/AlF3; catalyst; activity; reaction conditions;

D O I：

10.1007/BF00811495

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 effect of the structure of Alf(3) supports in CrF3/AlF3 catalysts and their activity were studied, and a selection of suitable reaction conditions for fluorination of trichloroethylene and HCFC-133a was made. We found that neither AlF3(alpha- and gamma-modifications) nor CrF3/alpha-AlF3 exhibits significant activity for the reaction of HF with CCl2=CHCl or CF3CH2Cl. However, CrF3/gamma-AlF3 exhibits high activity, which increases with increasing surface area and decreasing crystallite size of the gamma-AlF3 support, and that dramatically affects the fluorination of CF3CH2Cl. Investigation of a series of CrF3/gamma-AlF3 catalysts shows that the turnover rates per unit of the total surface area and of the free CrF3 surface area significantly increase with increasing content of Cr3+ loading. Optimum temperature for the reaction of HF with CCl2=CHCl is 260 degrees C, while with CF3CH2Cl it is 350 degrees C, with flow ratios HF:TCE=6:1 and HF:HCFC-133a=10:1.

引用

页码：221 / 224

页数：4

共 8 条

[1] THERMAL-DECOMPOSITION OF AMMONIUM HEXAFLUOROGALLATE AND AMMONIUM HEXAFLUOROINDATE - NEW CRYSTALLINE FORMS OF GALLIUM FLUORIDE AND INDIUM FLUORIDE [J].

BECK, LK ;

KUGLER, BH ;

HAENDLER, HM .

JOURNAL OF SOLID STATE CHEMISTRY, 1973, 8 (04) :312-317

[2]

CHEOFFERY W, 1992, J CHEM BRI, V28, P996

[3]

CORBIN D, 1992, Patent No. 16481

[4]

DAVID SJ, 1992, Patent No. 0502605

[5] AN OVERVIEW OF THE COMMERCIAL DEVELOPMENT OF CHLOROFLUOROCARBON (CFC) ALTERNATIVES [J].

MANZER, LE .

CATALYSIS TODAY, 1992, 13 (01) :13-22

[6]

Shibanuma T., 1992, [No title captured], Patent No. [0,514,932, 0514932]

[7] THERMAL DECOMPOSITION OF AMMONIUM HEXAFLUOROFERRATE(3) AND AMMONIUM HEXAFLUOROALUMINATE . A NEW CRYSTALLINE FORM OF ALUMINUM FLUORIDE [J].

SHINN, DB ;

CROCKET, DS ;

HAENDLER, HM .

INORGANIC CHEMISTRY, 1966, 5 (11) :1927-&

[8]

Tung H. S., 1992, Catalyst for the Manufacture of Chlorofluorocarbons, Hydrochlorofluorocarbons, and Hydrofluorocarbons, Patent No. [US 5,155,082, 5155082]

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