• 제목/요약/키워드: $VSb/Al_2O_3$

검색결과 2건 처리시간 0.016초

Vapor-phase Oxidation of Alkylaromatics over V/TiO2 and VSb/Al2O3 Catalysts: Effect of Alkali Metals

  • Yoon, Ji-Woong;Jhung, Sung-Hwa;Chang, Jong-San
    • Bulletin of the Korean Chemical Society
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    • 제28권12호
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    • pp.2405-2408
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    • 2007
  • Oxidation of alkylaromatics including toluene and p-methoxytoluene has been carried out over alkali metal (AM)-containing catalysts such as AM-V/TiO2 and AM-VSb/Al2O3 in vapor-phase using oxygen as an oxidant. The selectivity for partial oxidations increases with incorporation of an alkali metal or with increasing the basicity of alkali metals (from Na to Cs), irrespective of the supports or reactants. However, the conversion is nearly constant or slightly decreasing with the addition of alkali metals in the catalyst. The increased selectivity may be related with the decreased acidity even though more detailed work is necessary to understand the effect of alkali metals in the oxidation. The AM-VSb/Al2O3 may be suggested as a potential selective catalyst for vapor-phase oxidations.

이소부탄의 산화탈수소반응에 대한 여러 담지체에 따른 V-Sb 산화물 촉매 성능 효과 (Effect of Various Supports on the Catalytic Performance of V-Sb Oxides in the Oxidative Dehydrogenation of sobutane)

  • Shamilov, N.T.;Vislovskiy, V.P.
    • 대한화학회지
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    • 제55권1호
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    • pp.81-85
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    • 2011
  • 이소부탄의 산화탈수소반응(ODH)에 대한 $V_{0.9}Sb_{0.1}O_x$ 촉매계의 5가지 담지체의 촉진효과를 조사하였다. 사용된 5가지 담지체는 감마-알루미나, 알파-알루미나, 실리카-알루미나, 실리카겔, 마그네슘 산화물이다. 촉매는 사용된 담지체에 따라 그 효과가 다르게 나타났다: ${\gamma}-Al_2O_3$ > $\alpha$-$Al_2O_3$ > Si-Al-O> $SiO_2$ $\approx$MgO$\gg$unsupported. V-Sb-O 비율은 별로 촉매 활성과 선택성에 영향을 미치지 않았다. 촉매 성분들이 담지체에 골고루 잘 분포된 이유로 인해 감마-알루미나에 담지된 $V_{0.9}Sb_{0.1}O_x$ 촉매계가 성능이 제일 뛰어났다.