Different Morphology Of Amorphous Ni-p Catalyst Synthesis And Metal Combined With The Enzyme Kinetic Resolution

By nano-technology combined with catalysis, the preparation of efficient catalysts with a unique catalytic activity and selectivity become the main direction of research among catalytic scientists. This paper mainly focuses on preparation of a series of special morphologies of nano-catalyst, and studied the relationship between their morphology, catalytic activity and the chemical selectivity. Finally, the dynamic split of chiral compounds chiral compounds with the structure of a single enantiomer by combination of nano-catalysts and enzyme. Around these two main aspects, this paper is developed in the following areas:1)Two-dimensional hexagonal-arranged amorphous Ni-P alloy catalyst was prepared by combining hard template technology and electroless plating. SBA-15 as a rigid template and Pd nano-particles as seeds leading decomposition make Ni-P alloy gradually grow along the pore of SBA-15, and eventually completely fill the pore. After the removal of silicon with NaOH solution, amorphous Ni-P alloy catalyst with pore structure has been copied reversely. By XRD, TEM, BET, XPS and other testing methods, the morphology of the catalyst and surface electronic properties were examined in detail. The fleshly prepared amorphous Ni-P alloy catalyst, which has a better copy of the pore structure of SBA-15, has a better ordered structure. The catalyst performance was tested in maltose hydrogenation reaction, which show a high catalytic actitvity. The existence of ordered pore structure is conducive to the transmission and increasing contact area of the catalyst and the substrate2)The nano-scale silica ball was used as a template to prepare amorphous Ni-P alloy catalyst with a hollow structure by electroless plating technique. By using more uniform size of silica nano-ball as a template, hollow Ni-P alloy catalyst was successfully prepared with a more uniform structure of hollow morphology. Similarly, by XRD, TEM, BET, XPS and other testing methods, the morphology of the catalyst and surface electronic properties were examined in detail. It is proved that Ni-P alloy catalyst has obvious cavity structure, and its shell exists the worm-shaped nano-scale pore structure, and facilitates the exchange of materials within and outside the cavity. Similarly, of amorphous Ni-P alloy catalyst with a cavity structure showed higher catalytic activity than the solid nano-Ni-P alloy catalyst in maltose hydrogenation reactions.3)Combination of The Pd metal catalysts and enzyme is used into dynamic kinetic resolution of racemic benzene ethanol., the maximum limit in classical kinetic resolution of chiral compounds is the maximum theoretical conversion rate of 50%, while the dynamic kinetic resolution is to break its maximum conversion rate of 50% limit, the theoretical conversion rate can reach 100%. This thesis examines nano-metallic Pd catalyst and the enzyme as a combination of racemic phenylethanol split-pot reaction system. And the optimized one-pot reaction system and reaction conditions. After optimization of the reaction system, 82% of benzene in ethanol can be split out. At the same time, through a series of phenethyl alcohol homologue the split reaction, this one-pot reaction system is proved certainly universal.