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Dehydrogenation of Ethane with Carbon Dioxide to Ethene

Author: GuoXiaoHong
Tutor: ZhenKaiJi
School: Jilin University
Course: Physical and chemical
Keywords: Ethane Carbon dioxide Dehydrogenation Ethylene
CLC: TQ221.121
Type: Master's thesis
Year: 2005
Downloads: 115
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Abstract


The processes of catalytic conversion of alkanes into their corresponding alkenes by oxidative or nonoxidative dehydrogenation are of increasing importance because of growing demand for alkenes. Ethane is an abundant component in natural gas; however, its utilization in these processes receives the least attention due to the existence of traditional thermal cracking process. The oxidative dehydrogenation of ethane by oxygen into ethylene has been proposed as an alternative to the process of thermal cracking of ethane because it possesses several advantages, such as lower reaction temperature operation and less catalyst deactivation due to coking. Carbon dioxide as one of the major greenhouse gases has recently been considered as a source of carbon. In fact, carbon dioxide can also act as a mild oxidant. Utilization of carbon dioxide in some partial oxidation reactions, such as CO2 reforming of methane, oxidative coupling of methane, and oxidative dehydrogenations of ethane, propane, and isobutane, has been reported. In this investigation, several supported Co, Cr oxide and cobalt-substituted MCM-41 catalysts were prepared and their catalytic behavior in the oxidative dehydrogenation of ethane with carbon dioxide over these catalysts, were studied. Supported chromium and cobalt oxides are well known to be active catalysts for dehydrogenation of alkanes. Firstly, a series of Co-Cr/SiO2 and Co-Cr/Al2O3 catalysts with different Co/Cr ratios was prepared by impregnation method. We investigated the catalytic activity of these catalysts in the oxidative dehydrogenation of ethane, and found that these catalyst systems showed high selectivity to ethylene but low conversion of ethane and carbon dioxide. 1%Co-5%Cr/ Al2O3 was found to be the best catalyst for the topic reaction. At 973K, the conversion of C2H6 and CO2 were 25.57% and 13.72% respectively; the selectivity of C2H4 was 94.28%. The effects of

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Saturated lipid hydrocarbon > Ethane
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