제조공정에 따른 TiO_(2)계 복합촉매분말의 특성변화연구
(A) Study on the properties change of M/TiO_(2)composite catalytic powder fabricated by various process
제조공정 복합촉매분말 금속공학 금속재료공학;
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In the present study, TiO_(2) imbedded metal matrix powders have been successfully prepared from the composite mechanical alloying method, electroless plating method and salt solution method. By using mechanical alloying method for useful composite catalysis, the effects of mechanical alloying time on the formation of 10wt% Cu/TiO_(2) composite powders were analyzed. The phase transformation behaviors were experimented as the heat treating temperature increased. Homogeneous 10wt%Cu-rutile type TiO_(2) composite powders were synthesized in 40hours by mechanical alloying. Both phases of mechanically alloyed 10wt% Cu/TiO_(2) and pure TiO_(2) powders were not transformed to anatase after anealing at the temperature range between 350 to 500℃. The intermetallic compound of Cu_(2)Ti_(4)O was formed after 10 hours mechanical alloying, however it could be considered that this intermetallic phase dose not prevent the transformation for rutile TiO_(2) to the anatase phase after heat treatment at the temperature between 350 and 550℃. Electroless plating method for useful composite catalysis, the effects of electroless plating method on various formation of M/TiO_(2) composite powders were analyzed. From the result of analysis, it was known that fabricated powders of electroless plating method were not made to catalysis formation powders. In the last process, salt solution method have been successfully prepared from (CuSO_(4)· 5H_(2)O+TiO_(2)+Zn) composite. The composite powders were formed by drying the solution 200∼500 ℃ in the hydrogen atmosphere. The catalytic characteristics was evaluated by detecting UV-vis spectrometer concentration. Phase analysis of M/TiO_(2) composite was carried out by XRD and powder size was measured with TEM. The mean particle size of composite powders was about 100nm and a few zinc oxide and copper oxide and zinc sulfur phase were included. The reduction ration of UV-vis spectrometer concentration was 80% by composite M/TiO_(2) powders under the dark irradiation for 4 hours.