화학공학소재연구정보센터
Journal of the Korean Industrial and Engineering Chemistry, Vol.5, No.2, 295-304, April, 1994
아크롤레인 선택 산화반응에서 Mo-V-O와 SnO2의 상간협동 - II. 담지촉매 -
Phase Cooperation between Mo-V-O and SnO2 in Selective Oxidation of Acrolein - II. Supported Catalysts -
초록
담지촉매인 Mo-V-O/SnO2(VM/Sn)와 SnO2/Mo-V-O(Sn/VM) 촉매를 제조하여 XRD, BET, SEM, NH3, TPD 등으로 특성분석을 실시하였다. 고정층 연속 반응기에서 아크롤레인의 산화반응을 수행한 결과 이들 촉매의 아크롤레인 전화율과 아크릴산 수율이 Mo-V-O 자체보다 높았다. 이와 같은 상승효과의 원인을 TPD, TPR, TPO 등의 방법으로 고찰한 결과 Mo-V-O와 SnO2의 접촉면에서 Mo-V-O가 SnO2 상으로 전자를 전달하고 SnO2는 spill-over oxygen을 Mo-V-O 상으로 전달함으로써 반응에 의하여 부분환원된 Mo-V-O의 재산화를 촉진시키는 상간협동 현상이 존재하기 때문으로 판단되었다.
Mo-V-O/SnO2(VM/Sn) and SnO2/Mo-V-O(Sn/VM) catalysts have been prepared and characterized by XRD, BET, SEM and TPD of ammonia. The catalytic reaction of acroleln oxidation with these catalysts, in a continuous-flow fixed-bed reactor, showed that they had higher conversion of acrolein and higher yield of acrylic acid than those of Mo-V-O itself. The origin of the observed synergy studied by TPD, TPR and TPO is explained by the cooperation of SnO2 and Mo-V-O at their interfaces where electrons flow from Mo-V-O phase to SnO2 and SnO2 produces spill-over oxygens, which, by being transported onto the surface of Mo-V-O, reoxidize the partially reduced active sites.
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