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xtuanai

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Abstract:
Catalytic  properties  of basic materials  investigated  in our laboratories  are
reviewed.  Firstly,  the types  of metal oxides  and the indications  of their  basic
properties  are presented.  Secondly,  the  importance  of  removing  H20,  CO2  and  02 from  the  surfaces  to  generate  basic  propertles  and  catalytic  activities  is demonstrated.  Thirdly,  the  reaction  characteristics  occuring  on  solid  base catalysts  are  described  for  the  following  reactions.  (I)  Double  bond  migration of  olefins.  (II)  Double  bond  migration  of  unsaturated  compounds  containing hetero  atoms.  (III)  Isomerization  of  alkynes  and  allenes.  (IV)  Hydrogenation  of olefins.,  (V)  Amination  of  olefins.  (VI) Hydrogenation  of  CO.  (VII)  Aldol addition  of  acetone.  Fourthly,  structures  of  active  sites  are  discussed  in reference  to  MgO  model  structures.  Four  types  of  active  sites,  OH  groups  and three  types  of  metal-oxygen  ion  pairs  of  different  coordination  numbers,  are proposed.  Finally,  future  directions  to  develop  solid  base  catalysts  are suggested.
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2Â¥2011-03-20 18:10:30
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3Â¥2011-03-21 14:58:29
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4Â¥2011-04-04 19:19:23
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