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Cu-ZSM5 촉매상에서 일산화질소 분해반응에 대한 연구
Park, Dal-Ryung,Park, Hyung-Sang,Oh, Young-Sam,Cho, Won-Ihl,Paek, Young-Soon,Pang, Hyo-Sun 한국에너지학회 1997 에너지공학 Vol.6 No.1
유기주형물질을 첨가하지 않고 순수하고 결정성이 좋은 구리이온이 교환된 Cu-ZSM5 제올라이트 촉매를 제조하여 NO 분해반응 실험에 사용하였다. 구리이온교환 정도의 증가에 따라 NO 분해 활성은 점차로 증가하였고 100% 이상으로 구리이온교환 시에도 지속적으로 증가하였다. 산소의 존재하에서 NO의 분해 활성은 $O_2$양이 증가할수록 저하되었고, NO, $O_2$TPD실험 결과 NO의 분해 활성점과 $O_2$의 흡착점은 같은 것으로 판명되었다. 또한 50$0^{\circ}C$에서 전처리 후에도 촉매 표면의 $O_2$는 완전히 탈착되지 않았으며, 50$0^{\circ}C$에서 수소 처리를 하였을 경우 반응 활성이 초기에 상당량 향상되는 현상으로 보아 촉매 표면에 흡착된 산소가 NO의 분해반응 활성을 저하시키는 요인이 된다는 것을 알 수 있었다. Highly crystalline Cu-ZSM5 was prepared without using organic templates. Several ion exchange treatments between Na$\^$+/ and Cu$\^$2+/ brought about excess loading of copper ions on the ZSM5 zeolite and the resultant zeolite was active for the decomposition of NO. This indicates that the copper ions excessively loaded on the ZSM5 zeolite are effective for the NO decomposition. When oxygen was added to a reactants, the conversion of NO decreased. NO, O$_2$TPD experiments explained that the active sites for NO decomposition and the adsorption sites of O$_2$, were the same. O$_2$, at the surface of ZSM5 zeolite was desorbed incompletely after pretreatment at 500$^{\circ}C$, and CU-ZSM5 pretreated with H$_2$at 500$^{\circ}C$ showed promoted activity at the start of reaction. Thus, it seems clear that O$_2$, adsorbed ai the surface of catalyst inhibits the catalytic activity.
Shul, Yong Gun,Park, Sang Eon,Yamashita, Hiromi,Anpo, Masakazu,Matsuoka, Masaya,Park, Dal Ryung 한국공업화학회 2000 Journal of Industrial and Engineering Chemistry Vol.6 No.2
Titanium or vanadium oxide species incorporated within the framework of zeolites or mesoporous molecular sieves by an ion-exchange method or hydrothermal synthesis show high and unique photocatalytic activities for various reactions such as the decomposition of NO into O_2 or the reduction activities of CO_2 with H_2O to produce CH_4 and CH_3OH. In situ photoluminescence, XAFS and ESR investigations revealed that titanium as well as vanadium oxide moieties exist in highly dispersed tetrahedral coordination states in the zeolite framework and the charge transfer excited state of these transition metal oxide species play a vital role in the photocatalytic reactions on these zeolite and molecular sieve catalysts. The unique physicochemical properties of porous materials such as pore size, channel structural dimensions, and distribution of ion-exchangeable sites are shown to be important factors in controlling the dispersion and local structures of the metal oxides incorporated within such porous materials as well as the photocatalytic reactivities and selectivities in various photocatalytic reactions.