Application of Transition Metal Coordination for Energy Efficient Processes

Released on by Sweta Shrestha
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  • Application of Transition Metal Coordination for Energy Efficient Processes Book Detail

  • Author : Sweta Shrestha
  • Release Date : 2017
  • Publisher :
  • Genre : Chemistry
  • Pages : 307
  • ISBN 13 :
  • File Size : 28,28 MB
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Application of Transition Metal Coordination for Energy Efficient Processes by Sweta Shrestha PDF Summary

Book Description: The goal of this dissertation is to explore the application of transition metals in two energy-intensive processes, photochemical water oxidation and olefin/paraffin separation. Photochemical water splitting is widely studied and involves the exploitation of renewable resources solar energy and water to produce clean hydrogen along with oxygen. Water oxidation process to make oxygen is not thermodynamically and kinetically feasible, thus catalysts which can promote this reaction are needed. With efficient water oxidizing catalysts, the entire water splitting process is promoted. We are focusing on birnessite as catalysts for photochemical water oxidation. Birnessite are layered manganese oxides with intercalated cations and water molecules in the interlayer space. They are known as moderate water oxidizing catalysts. We have developed two strategies to enhance water oxidizing catalytic activity of birnessite. Our first strategy was the deposition of birnessite on zeolite surfaces. The synthesis method involves ion-exchanging Mn2+ cations along with alkaline earth metal co-cations (M2+: Mg2+, Ca2+, Sr2+, Ba2+) into zeolite followed by the precipitation of manganese oxides on zeolite surfaces. M2+ cations control the loading of Mn2+ cations into zeolite, such that the larger cationic size of M2+, the lower the loading of Mn. These samples are amorphous manganese oxides and referred to as M2+MnOx-Y. After treating with high concentration of K+ cations, there was improvement in crystallinity in manganese oxides forming birnessite, and we refer to them as KMnOx-Y(M2+).

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