Research About Preparation,Characterization And Wgsr Activity Test Of Fe And Cu-based Composite Oxides

WGSR is receiving more and more attention as an efficient method to lower carbon monoxide contents in synthesis gas.Traditional WGSR catalysts encounters disadvantages like bad thermal stability,harmful to environment,etc,while most of new WGSR catalysts adopt noble metals like Au,Pt and Pd,which impedes its widely use,so economic and environment-friendly catalysts with good reacting activity,stability and selectivity is still worthwhile to explore.In chapter ?,we prepare plate-like Fe/Ni/Al composite oxides with various mole ratios in P123?MW?5800?solutions.Cu is added to the reactants to adjust bad thermal stability of Fe-Ni-O_x composite oxides.Fe-Ni-Al-O_x composite oxides is loaded on treated MCNTs and A4 paper for OER.We find Fe-Ni-O_x exhibits good reacting activity but low CO selectivity,doping of Cu could effectively adjust its thermal stability.Fe-Ni-Al-O_x has bad WGSR reacting activity,but good OER performance after loaded on treated MCNTs and A4 paper.In chapter IV,mesoporous Fe₂O₃ and CeO₂ nanorods are adopted as support to load CeO₂ and Fe₂O₃ respectively.As to Fe₂O₃/CeO₂ series,various additives and small molecules?H₂,CO and air?are used to adjust catalyst's performance.XRD,TEM,BET,XPS,H₂-TPR,LAMAN and HT-WGSR tests demonstrate that CeO₂ particles could be uniformly supported on mesoporous Fe₂O₃,but with undesirable reacting activity.While in CeO₂/Fe₂O₃ series,doping of Fe could form Fe-Ce solid solution,and synthetic atmosphere could enable the formation of Fe-Ce solid solutions,thus enhances its reacting activity.Samples got from H₂ atmosphere has peroxide defects?O₂2-?,while products obtained from CO atmosphere owns superoxide defects?O₂-?.In chapter V,globin-like CeCO₃OH is synthesized with CO as carbon source,and influence of different amounts of Cu,Zn loaded on catalysts' morphology is investigated.XRD,TEM,SEM and LT-WGSR tests illustrate that globin-like CeC030H with Cu,Zn oxides uniformly supported is successfully synthesized,mophologies maintains after calcination in 400? for 4 h.LT-WGSR reacting activity progresses with the increase of Cu,Zn doping.Based on above statements,H₂ and CO could enable the formation of Fe-Ce solid solutions,O₂2-and O₂-oxygen defects,improve reducibility of CeO₂,thus enhances catalysts' HT-WGSR reacting activity.While in Cu,Zn supported globin-like CeC030H,catalytic activity improves as the doping of Cu and Zn.Ceria-based material is a good support for WGSR,and small molecules could be used to adjust morphologies and catalytic performances of material.