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Synthesis and Characterization of a Copper Catalyst for Low Temperature Water –Gas Shift Reaction

Rafiee Renani, Mansoureh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45013 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Khorasheh, Farhad; Khandan, Nahid
  7. Abstract:
  8. Water Gas Shift (WGS) reaction is an old reaction in which syngas is used for producing Hydrogen. At the present time, the major application of this reaction is in fuel cells, since the necessary Hydrogen for these cells is provided by this reaction.
    The present study investigate the influence of different preparation methods on properties of Cu-ZnO/Al2O3 catalyst for water gas shift (WGS) reaction, which is now known as the Commercial catalyst for low temperature WGS, and its influence on performance of Cu-ZnO/Al2O3 catalyst to derive an optimal Cu-ZnO/Al2O3 catalyst for water gas shift (WGS) reaction. Cu-ZnO/Al2O3 catalysts was synthesized by CP, DP, DP-Ultra, IWI , CP-Urea, and Combined approach IWI-Urea methods. Nanostructured catalyst samples prepared were Characterized by XRD and SEM analyses and then their activity and selectivity were compared in a fixed bed reactor.
    The catalyst that prepared by a combination of IWI-Urea method as a selected catalyst, were investigated to determine the best operation conditions in WGS reaction. Therefore Response surface method (RSM) was used; so that three factors operating temperature (150-250C), the ratio of water to CO (4-8) and feed space velocity (35000-25000 h-1), for optimizing the performance of catalysts to achieve the highest level of CO conversion and selectivity hydrogen at 15 experiment was designed. By analyzing the results of experiments, temperature factor was the most important factor that affect about 72%. The optimum conditions for the maximum conversion of carbon monoxide(97%) were obtained: temperature of 250 ℃, ratio of steam to CO, 4 and a gas space velocity of 35000 h-1. It was concluded from these experiments that at low temperatures with reduce space velocity to medium space velocity due to increased residence time of feed in the reactor, will lead to better results, while in high temperatures, probably due to the competitive adsorption of water and CO on the active sites of catalyst, higher feed velocities give better results. In addition, at low space velocity of gas and low the ratio of steam to CO due to inhibition of the catalytic active sites occupied more water, more activity was observed
  9. Keywords:
  10. Experiments Design ; Operational Optimization ; Water Gas Shift (WGA)Reaction ; Copper Oxide-Zinc Oxide Catalyst Preparation

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