Gas 5 CH3C CH 623 H,OH+H,0 Al0 683 soli Control dthe Selectivity for 5 CH, C (C2H Gas different b H,OH ALO 523 soli products +HO d 6 CH+/CO 673~ 01013Gas O2+H, Ni/ALO 1273 -105soli d Control the Selectivity for 1013 CO 6CH4+ 气体时 Gas different +NiA2O3>673空速率 soli products b HO ~1000 d 6
6 5a CH 3 C H 2OH C 2 H 4 ＋ H 2 O Al 2 O 3 623~ 683 Gas ,soli d Control the Selectivit y for different products 5b CH 3 C H 2OH （ C 2 H 5 ） 2 O ＋ H 2 O Al 2 O 3 523 Gas ,soli d 6a CH 4 ＋ O 2 CO ＋H 2 Ni/Al 2 O 3 673~ 1273 0.1013 ~10 5 h －1) Gas ,soli d Control the Selectivit y for different products 6b CH 4 ＋ O 2 CO 2 ＋H2O Ni/Al 2 O 3 ＞673 0.1013 气体时 空速率 ~1000 h－1 Gas ,soli d
Catalyst has been called as molecular machin Accelerate the chemical reaction rate "s Accelerate selectively one of the several thermodynamically possible reactions and yield selectively the special products Namely, the use of catalysts can control the selectivity for special products Control the enantioselectivity of reaction
7 Catalyst has been called as molecular machine ❖ Accelerate the chemical reaction rate. ❖ Accelerate selectively one of the several thermodynamically possible reactions and yield selectively the special products. ✓ Namely, the use of catalysts can control the selectivity for special products. ✓ Control the enantioselectivity of reaction
Catalyst has been called as molecular machin g Synthesize the special conformation of chiral Isomers The consideration of incorporating the catalyst with the reaction conditions could control the selectivity of chemical reaction o High selectivity and atom economy is of the most importance in bio-process, and all the reactions in organism are catalyzed by enzyme which are characterized with high specificities selectivity and atom economy
8 Catalyst has been called as molecular machine ❖ High selectivity and atom economy is of the most importance in bio-process, and all the reactions in organism are catalyzed by enzyme which are characterized with high specificities, selectivity and atom economy. ❖ Synthesize the special conformation of chiral isomers: The consideration of incorporating the catalyst with the reaction conditions could control the selectivity of chemical reaction
Catalyst has heen called as molecular machie Hence, those enzyme have been called as Molecular Machine ADP A hand-over-hand mechanism for kinesin ATP→ADP+
9 Catalyst has been called as molecular machine Hence, those enzyme have been called as Molecular Machine. ADP ATP ATP ADP ATP→ADP+ ADP Pi ATP ADP A hand-over-hand mechanism for kinesin
Catalyst has been called as molecular machin Recent investigations have reported that not only enzyme acts as molecular machine but also the common catalysts own the similar functions The classical example is the metal cyclopentadiene(环戊二烯) complex which was used as the catalyst in olefin polymerization
10 Catalyst has been called as molecular machine ❖ Recent investigations have reported that not only enzyme acts as molecular machine but also the common catalysts own the similar functions. ❖ The classical example is the metal cyclopentadiene (环戊二烯) complex which was used as the catalyst in olefin polymerization