The Preparation Of Nobel Metal Nano-cluster/Hyperbranched Polyamide Hybrid Membrane And Its Catalytic Activity For Hydrogenation Of Benzene

Hyperbranched polyamide is one of the highest polymer material with high fireresistance, heat resistance, especially high mechanical performance and excellentchemical stability. Cyclohexene is also an important chemical raw material, it is anintermediate product of hydrogenation of benzene, and the reaction is difficultybecause of thermodynamics stable. Nano-metal catalyst has so many metal surfaceand active center. Thus, it’s very important to investigation of catalyst for the partialhydrogenation of benzene to cyclohexene.A series of hyperbranched polyamides with different structure were synthesizedby direct condensation polymerization, and the corresponding nano-metal/hyperbranched polyamide catalysts were prepared. And the catalytic properties ofnano-metal/hyperbranched polyamide for the hydrogenation of benzene were studied.There are three parts to be included in this paper:1. The A2+B3and A2+B3+AB type hyperbranched polyamide by the solutionpolycondensation were prepared, using p-phenylenediamine and4,4’-oxybisbenzenamine as A2monomer, trimesic acid as B3monomer, calledPPD-HBPA and ODA-HBPA. Then a series Pt/HBPA hybrid membrane were prepared,which characterized by IR, NMR, TEM, XRD and, XPS. Results showed that with thechanges of the monomer molar ratio, there are corresponding changes in theconversion rate of benzene and the selectivity of cyclohexene, especially the carrier isA2：B3=1:1PPD-HBPA, the hybrid membrane catalyst showed high reactive andgood recycle times.2. BD-HBPA and MDA-HBPA were prepared by the solution polycondensation,using biphenyl diamine and4,4’-diaminodiphenylmethane as A2monomer, trimesicacid as B3monomer. And then four kind of Ru-PPD-HBPA, Ru-ODA-HBPA,Ru-BD-HBPA, Ru-MDA-HBPA hybrid membrane were prepared, which characterized by TEM, XRD and, XPS. Results showed that using the A2：B3=2:1asexample, with the increasing of molecular chain length of A2monomer, themolecular cavity of the carrier increased, the conversion rate of benzene decreased,and the selectivity of cyclohexene increased.3. End amino functional groups of the ODA-type hyperbranched polyamidewere modified with acryloyl chloride. Then crosslink material was made by theself-crosslink reaction between the acyloyl and modified polymer, five kind ofdifferent crosslink degree hybrid membranes were obtained, which were characterizedby IR, NMR, SEM, XRD and, XPS. Results showed that with the increasing ofcrosslink degree, the conversion rate of benzene gradually increased, the selectivity ofcyclohexene increased at the same time.