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Financial phthalocyanine complexes and study of heteropoly acid catalytic performance

Author: CuiXiaoYu
Tutor: HeJianXun
School: Northwestern University
Course: Energy and chemical
Keywords: Direct methanol fuel cell Cobalt phthalocyanine modified electrode Catalyzeoxygen reduction Polyoxametaltate
CLC: O643.36
Type: Master's thesis
Year: 2012
Downloads: 68
Quote: 0
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Abstract


The direct methanol fuel cess (DMFC) has been received widespread attention due to the energy conversion rate, low pollution and low fuel prices. At present, because of the expensive Pt-based catalyst of the cathode catalysts of direct methanol fuel, and Pt-based catalysts with methanol permeability limited its commercialization. However, the metal phthalocyanines is considered that it is the most likely to be replaced the cathode catalyst of Pt-based catalysts. Because it is a class of the macrocyclic compounds which has a high conjugate structure and chemical stability, it has good electro-catalytic reduction for molecular oxygen. In recent years, transition metal phthalocyanine is used as oxygen reduction catalyst for applied research which is attracting many people’s attentions.In this paper, we use the improved of phthalic anhydride-urea solid phase melting method to synthetize cobalt phthalocyanine and nitro-substituted cobalt phthalocyanine. Through single factor and orthogonal experiments, we investigated the influence of different reaction conditions on product yield, and obtained the optimum synthesis conditions of nitro-substituted cobalt phthalocyanine:reaction temperature is215℃,CoCl2with Phthalic anhydride molar ratio is0.25, the amount of catalyst is2.0%, reaction time is3.Oh. After treatment, infrared characterization of the synthesized product, the results show that the product is the target product.In order to research the electrocatalytic performance of the catalyst better, we conduct the cobalt phthalocyanine as catalyst precursor, and let it immobilize with the activated carbon, the heat treatment prepared the catalyst under a nitrogen atmosphere. We have systematically investigated the heat treatment temperature, the influence of heat treatment time and the load of phthalocyanine catalytic performance for oxygen reduction,and obtained the optimum synthesis conditions of catalyst:activating temperature is800℃, activating time is6h, the load of phthalocyanine catalytic is10%. We use electrochemical workstation to study and compare the oxygen reduction ability of the catalyst under different prepared conditions. Finally, we use cyclic voltammetry to study the ability catalytic reduction of oxygen when the TNPcCO doped with heteropoly acid before and after. The results show that doped with phosphorus molybdate and cobalt phthalocyanine modified electrode have a better catalytic ability and stability in acidic solution.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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