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      • HARVEST
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      Preparation and evaluation of sol-gel made nickel catalysts for carbon dioxide reforming of methane

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      HSunThesis.pdf (819.9Kb)
      Date
      2005-07-21
      Author
      Sun, Haijun
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      Sol-gel (solution-gelation) method was used to prepare Ni-Ti and Ni-Ti-Al catalysts for reforming of methane with carbon dioxide. This method, after optimizing the parameters such as hydrolysis and acid/alkoxide ratio, is able to make a Ni-Ti catalyst with a surface area as high as 426m2/g when calcined at 473K; but calcination at higher temperature lead to dramatic decrease in surface area. XRD, XPS, TEM and SEM were used to understand this change. Using a packed bed reactor, the catalysts were evaluated with the reforming reaction. It was found that the activity of the Ni-Ti catalyst increases with the Ni loading in the range of 1-10wt%. The reduction temperature has strong effect on activity of the reduced catalyst. Up to 973K, the activity increases with the reduction temperature; but after 973K, the activity decreases and become 0 when the temperature is over 1023K. The Ni-Ti catalyst also deactivated as 15% after 4h of time on stream. The XRD analysis shows that Ti3O5 formed in the catalyst after higher-temperature reduction as well as after the reaction for a period of time. The formation of Ti3O5 may render the catalyst to loss its activity. However, further study is expected to understand the mechanism. TG/DTA analysis shows that both Ni-Ti and Ni-Ti-Al catalysts had carbon deposition; but the latter maintained higher activity in a longer period of time.
      Degree
      Master of Science (M.Sc.)
      Department
      Chemical Engineering
      Program
      Chemical Engineering
      Supervisor
      Wang, Hui
      Committee
      Pugsley, Todd; Foley, Stephen R.; Dalai, Ajay K.
      Copyright Date
      July 2005
      URI
      http://hdl.handle.net/10388/etd-08042005-163530
      Subject
      sol-gel
      syngas production
      Methane reforming
      Ni-Ti catalyst
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