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Fischer-Tropsch Synthesis over ZrO2-SiO2 Supported Cobalt Catalysts

Author: ZhangShuLi
Tutor: WangYe
School: Xiamen University
Course: Physical and chemical
Keywords: Supported cobalt catalyst ZrO2-SiO2 composite oxide support Fischer-Tropsch synthesis
CLC: O643.32
Type: Master's thesis
Year: 2009
Downloads: 205
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Abstract


Coal, natural gas and biomass as raw material by the syngas through the Fischer-Tropsch (FT) synthesis preparation of clean liquid fuels to alleviate the energy problem has aroused extensive concern . The design and synthesis of FT synthesis catalyst has high activity and selectivity is of great practical significance for the efficient use of the non - oil-based resources such as coal, natural gas and biomass . This thesis focuses on research supported multiphase cobalt catalyst FT synthesis reaction . The paper focuses on the the ZrO 2 -SiO load cobalt catalyst system as the carrier 2 composite oxides investigated the role of ZrO 2 and structural characterization of the catalyst , trying to establish a structure-activity correlation . The study found that with the pure SiO 2 and ZrO 2 compared ZrO 2 -SiO 2 composite oxide load of cobalt catalyst with a low methane selectivity and higher C 5 over hydrocarbons (C 5 ) selective . Change many influencing factors ( the cobalt content composite oxide composite mode and of ZrO of 2 < / sub> / SiO 2 2 mass ratio , etc.) to optimize the composition of the catalyst , and found that 5 wt% of Co / the ZrO 2 -SiO 2 ( as ZrO in 2 / SiO 2 = 1 ) catalyst showed the best C < sub> 5 selective . Investigation on the catalytic performance of the reaction temperature and pressure , in the reaction temperature is 523K, a pressure of 2.0 MPa , the reaction gas flow rate of 20 ml / min , CO with H 2 ratio of 1/1 under the conditions , after 12h reaction , the CO conversion was 45.9 % , CH 4 selectivity of 4.2 % , the C 5 / sub > . < / sup> 91.6% selectivity . N 2 physical adsorption , XRD, TEM , CO chemisorption and H 2 -TPR characterization results show that ZrO 2 < / sub > adding promoting activity the dispersibility of the component cobalt species on the catalyst formed smaller cobalt oxide particles , and is conducive to improve the catalyst can restore performance. By correlating structure and catalytic properties , the paper argues that the dispersion of cobalt species suitable particle size reduction ability is a key factor affecting the performance of cobalt catalyst for Fischer-Tropsch synthesis reaction .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
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