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首页> 外文会议>NATO Advanced Study Institute on Sustainable Strategies for the Upgrading of Natural Gas: Fundamentals, Challenges, and Opportunities; 20030706-18; Vilamoura(PT) >COKE FORMATION ON ALUMINA AND ALUMINA SUPPORTED PLATINUM CATALYSTS
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COKE FORMATION ON ALUMINA AND ALUMINA SUPPORTED PLATINUM CATALYSTS

机译：氧化铝和氧化铝支持的铂催化剂上的焦炭形成

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摘要

As follows from the FT-IR study the carbonaceous deposit obtained from decomposition of the chemisorbed ethylene and butene-1 used as precursors on Al_2O_3 is of typical carboxylic character (scheme 1). At 100℃ deposit contain species with C=O groups (scheme 2). In elevated temperatures also a deposit of aromatic character is formed. The presence of Cl~- ions introduced from HCl and NH_4Cl inhibit the formation of the aromatic deposit. For the samples with 2-methylopropene deposited on Al_2O_3 the coke obtained has both carboxylic and aromatic character. The carbonaceous deposit formed on samples with butene-1 introduced on platinum catalysts has a more complex nature. With increasing concentration of platinum the carboxylic character of the deposit decreases, which indicates that it is related to the presence of Al_2O_3. Moreover, C=O species was also detected for examined catalysts (scheme 2).
机译：如下从FT-IR研究得出的那样，在Al_2O_3上通过化学吸附的乙烯和丁烯-1的前体分解得到的碳质沉积物具有典型的羧基特征（方案1）。在100℃下，沉积物中含有带有C = O基团的物种（方案2）。在升高的温度下，也形成芳香特性的沉积物。从HCl和NH_4Cl引入的Cl〜-离子的存在会抑制芳香族沉积物的形成。对于在Al_2O_3上沉积有2-甲基丙烯的样品，所获得的焦炭具有羧酸和芳香族特征。在铂催化剂上引入丁烯-1的样品上形成的碳质沉积物具有更复杂的性质。随着铂浓度的增加，沉积物的羧基特征降低，这表明其与Al_2O_3的存在有关。此外，对于所检查的催化剂也检测到了C ＝ O种类（方案2）。

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