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Synthesis And Application Of Carbon Supported Metal Particles Catalyst

Posted on:2015-04-07Degree:MasterType:Thesis
Country:ChinaCandidate:X J ZhuFull Text:PDF
GTID:2271330431468763Subject:Physical chemistry
Abstract/Summary:PDF Full Text Request
Gold, palladium nanoparticles in the hydrogenation, oxidation, and other couplingreactions showed excellent catalytic activity. Therefore, the work of this paperfocused on the use of carbon-based carrier, stable load gold, palladium nanocatalyst.The thesis is divided into four chapters,the first chapter of the literature review,including a load of gold catalysts, Progress and load hollow sphere of metalnanoparticles.The second chaptcr of the research is focused on hard template preparationmethod of hollow carbon nanosphere and supported palladium catalyst First,Ami no-surface silicon oxide as hard template, low molecular weight phenolic resin asa carbon source, hydrothermal preparation of the polymer/silica sphere, hightemperature carbonization, remove to the silicon oxide hard template to obtain hollowcarbon nanosphere, It is preferably a monodisperse size is about130nm; carbon layerthickness of10nm, and disordered distribution of mesoporcs and micropores large;Copy amino almost cavity silicon oxide pellets, size of about110nm; having a highspecific surface aera (5612m/g) and large pore volume (0.633cm/g). Sodium chlorideis introduced during the preparation of the hollow palladium carbon nanospherepalladium source, palladium can be prepared in one step/carbon hollow nanosphere.Controlling the addition amount of palladium source and a calcination temperature,can be highly dispersed Pd nanoparticles size of about3?4nm,the morphology oforiginal hollow carbon spheres is maintainedThe third chapter of the load synthesis of gold/Ti02-C catalyst for benzene andmethanol oxidation reactions. First, phenolic resin as carbon, titanium tetrachloride asthe titanium source, F127surfactant, the use of solvent evaporation inducedself-assembly technique to synthesize mesoporous IIO2-C. The carrier has an orderedmesoporous structure, high surface area, and small particles of titanium dioxide(anatase, particle size of about4nm) dispersed uniformly in the wall. Further to the acid chloride of gold as the gold source, poly ethanol as a protective agent, sodiumborohydride as a reducing agent, or urea as the precipitating agent, the use of sol-gelor deposition-precipitation method for the preparation of gold nanoparticles catalyst.Highly dispersed gold particles on the carrier particle size of about4nm,high-temperature calcination to remove the polyvinyl alcohol protective agent, nosignificant gold nanoparticles grow. Alkali catalyst in the aqueous phase oxidation ofbenzyl alcohol conditions of the reaction showed good catalytic activity. In the O2patrial pressure of1atm, the reaction t°emperature is80C, reaction time6h,benzaldehyde yield of33%.The fourth chapter is the full text summary...
Keywords/Search Tags:palladium nanoparticles, hollow carbon nanosphere, gold nanoparticles, titanium dioxide/carbon, oxidation reaction
PDF Full Text Request
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