Morphological change of Pt/MoO3/SiO2 for the Synthesis of i-Butylene from n-Butene

N-Butene으로부터 i-Butylene 합성을 위한 Pt/MoO3/SiO2 촉매의 표면 구조 변화

  • 김진걸 (순천향대학교 공과대학 화학공학부)
  • Received : 1996.03.06
  • Accepted : 1996.09.02
  • Published : 1996.10.10

Abstract

Skeletal isomerization reaction known as exothermic reaction shows possible maximum yield of i-butene from n-butene at $110^{\circ}C$ over $Pt/MoO_3/SiO_2$. Compared with conventional catalyst such as silica, zeolite, alumina etc., $Pt/MoO_3/SiO_2$ demonstrates higher yield while by-products except 2-butene do not form. Faster H spillover rate over $Pt/MoO_3/SiO_2$ is demonstrated via isothermal reduction experiment at $110^{\circ}C$ compared to the rate over $Pt/MoO_3/Al_2O_3$. Overall isomerization rates are proportional to higher spillover rates from Pt onto $MoO_3$ surface. The skeletal isomerization reaction is composed of two elementary steps. First, carbonium ion formation over Pt crystallites by H spillover. Second, carbenium ion formation over $MoO_3$ followed by formation of i-butene. Moreover, it is suggested that H spillover step from Pt surface onto $MoO_3$ is assumed to be the rate determining step and control the overall isomerization rate.

Keywords

Acknowledgement

Supported by : 한국과학재단

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