Preparation of Fe-Mn/K/Al2O3 Fischer-Tropsch Catalyst and Its Catalytic Kinetics for the Hydrogenation of Carbon Monoxide

被引:25
作者
Fazlollahi, F. [1 ]
Sarkari, M. [2 ]
Gharebaghi, H. [3 ]
Atashi, H. [3 ]
Zarei, M. M. [3 ]
Mirzaei, A. A. [4 ]
Hecker, W. C. [1 ]
机构
[1] Brigham Young Univ, Dept Chem Engn, Provo, UT 84602 USA
[2] South Pars Gas Complex, Asaluyeh, Bushehr, Iran
[3] Univ Sistan & Baluchestan, Fac Engn, Dept Chem Engn, Zahedan, Iran
[4] Univ Sistan & Baluchestan, Fac Sci, Dept Chem, Zahedan, Iran
关键词
Fischer-Tropsch synthesis; catalysis; kinetics; chemical reactors; Levenberg-Marquardt (LM) method; Langmuir-Hinshelwood-Hogan-Watson (LHHW) kinetics; MANGANESE OXIDE CATALYSTS; IRON-BASED CATALYST; CO HYDROGENATION; SLURRY PHASE; PRODUCT DISTRIBUTION; INTRINSIC KINETICS; OLEFIN SELECTIVITY; MECHANISM; ADSORPTION; CHEMISORPTION;
D O I
10.1016/S1004-9541(13)60503-0
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A K promoted iron-manganese catalyst was prepared by sol-gel method, and subsequently was tested for hydrogenation of carbon monoxide to light olefins. The kinetic experiments on a well-characterized Fe-Mn/K/Al2O3 catalyst were performed in a fixed-bed micro-reactor in a temperature range of 280-380 degrees C, pressure range of 0.1-1.2 MPa, H-2/CO feed molar ratio range of 1-2.1 and a space velocity range of 2000-7200 h(-1). Considering the mechanism of the process and Langmuir-Hinshelwood-Hogan-Watson (LHHW) approach, unassisted CO dissociation and H-assisted CO dissociation mechanisms were defined. The best models were obtained using non-linear regression analysis and Levenberg-Marquardt algorithm. Consequently, 4 models were considered as the preferred models based on the carbide mechanism. Finally, a model was proposed as a best model that assumed the following kinetically relevant steps in the iron-Fischer-Tropsch (FT) synthesis: (1) CO dissociation occurred without hydrogen interaction and was not a rate-limiting step; (2) the first hydrogen addition to surface carbon was the rate-determining steps. The activation energy and adsorption enthalpy were calculated 40.0 and -30.2 kJ center dot mol(-1), respectively.
引用
收藏
页码:507 / 519
页数:13
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