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Study on Ni-Co/Al2O3-ZrO2 Catalyst for Carbon Dioxide Reforming of Methane

Author: AiJun
Tutor: LiWenYing
School: Taiyuan University of Technology
Course: Biochemical Engineering
Keywords: CH4-CO2 reforming Syngas Ni-Co/Al2O3-ZrO2 catalyst Coprecipitation
CLC: O643.36
Type: Master's thesis
Year: 2009
Downloads: 55
Quote: 0
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Abstract


CH4-CO2 reforming reaction of greenhouse gases can be converted into liquid fuel synthesis gas head CO/H2, Fischer - Tropsch synthesis for liquid fuel, the synthesis of methanol, dimethyl ether ideal raw material. The reaction is a key issue in industrialized a developer having a high activity, high stability of the catalyst. At present, a large number of studies have focused on the non-precious metals nickel, cobalt catalyst, the catalyst for the series, however, the poor stability of the catalyst due to the loss of the active component and coke serious reasons. In this paper, Ni-Co dual active component Al2O3-ZrO2 composite carrier coprecipitation catalyst prepared by CH4-CO2 reforming reaction investigated the catalytic performance. Specific studies include: (1) is calculated from the thermodynamic point of view, different temperatures, different pressures CH4-CO2 reforming reaction thermodynamic parameters of the theoretical analysis of the temperature and pressure of the CH4-CO2 reforming reaction; (2) comparative experiments for each of the different active ingredients and different carrier; (3) investigated Ni-Co/Al2O3-ZrO2 catalyst preparation conditions on the performance of the reforming reaction, combined with the characterization of XRD, BET, TPR, TPD analysis results obtained the following conclusions: 1) Thermodynamic calculations show that the side reaction occurs, the temperature of the reaction system to 700 ° C, the reaction products will produce a lot of water vapor, as well as lower H2/CO ratio; in higher reaction temperatures, the impact of the pressure variation of the entire reaction system is smaller, and thus the reaction temperature should be 900 ° C or above is selected, when the reforming reaction is carried out under pressurized conditions. 2) Ni-Co/Al2O3-ZrO2 catalyst in CH4-CO2 reforming reaction has a higher activity of 750 ° C reaction temperature, CH4, CO2 conversion rate of 80.9% and 81.5%. 3) Ni-Co single bimetallic catalysts found that the reducing ability of the bimetallic catalyst is significantly enhanced, also a slight increase in the CO2 adsorption, and showed good catalytic performance in the reforming reaction, and the bimetal may the formation of the alloy, which will benefit the improve the catalyst sintering resistance performance. 4) Single and Double carrier-supported Ni-Co bimetallic catalyst composite carrier supported catalyst for CO2 adsorption performance enhancements, and H2-TPSR results also show that the coke formed in the surface of the catalyst is more lively. 5) using a catalyst prepared by the KOH and NH · H2O two precipitating agents in the reforming reaction of CH4-CO2 results show that the catalyst prepared by the KOH precipitating agent to form more suitable for the interaction of the metal carrier (SMSI), thereby provides more active sites in the catalyst after reduction. 6) the impact of the Ni / Co ratio on the catalyst activity Experimental results show that the When the double active ingredient ratio of 1:1, Preferably, the catalytic performance of the performance of a catalyst.

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