Dehydrogenation of ethane to ethylene over a highly efficient Ga2O3/HZSM-5 catalyst in the presence of CO2
Dehydrogenation of ethane to ethylene over a highly efficient Ga2O3/HZSM-5 catalyst in the presence of CO2
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CO2 存在下高效 Ga2O3/HZSM-5 催化剂乙烷脱氢制乙烯
DOI：
10.1016/j.apcata.2008.12.038
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发表时间：
2009-03
影响因子：
5.5
通讯作者：
Liu, Jian
中科院分区：
文献类型：
--
作者：
Shen, Wei;Shen, Zhenhao;Xu, Hualong;Yue, Yinghong;Hua, Weiming;Liu, Jian
研究了在二氧化碳存在下，乙烷在不同的镓催化剂上脱氢制乙烯的反应。Al_2O_3/HZSM-5催化剂比β-Ga_2O_3具有更好的稳定性，且硅铝比较高的负载型氧化镓催化剂具有更好的抗失活性能。Ga2O_3/HZSM-5(97)催化剂在乙烷脱氢反应中表现出较高的活性和稳定性，乙烷转化率为15%，乙烯选择性为94%，70h内无明显的失活趋势。吸附吡啶的NH3-TPD和FT-IR光谱结果表明，随着载体硅铝比的增加，催化剂稳定性的提高是由于催化剂的酸性降低，从而抑制了裂化和齐聚等副反应。CO2对脱氢反应的促进作用归因于逆水煤气变换反应。CO2的引入也提高了催化剂的稳定性。
Dehydrogenation of ethane to ethylene in the presence of carbon dioxide was investigated over various gallium-based catalysts. Ga2O3/HZSM-5 catalysts show better stability than β-Ga2O3, and the higher Si/Al ratio HZSM-5 supported gallium oxide catalysts are more resistant to deactivation. The Ga2O3/HZSM-5(97) catalyst exhibits both high activity and stability for dehydrogenation of ethane, with an ethane conversion of 15% and ethylene selectivity of 94% without any observable trend of deactivation in 70h. The results of NH3-TPD and FT-IR spectra of adsorbed pyridine revealed that the enhancement of the catalyst stability with increasing Si/Al ratio of the support is caused by the decrease of the acidity of the catalysts, resulting in the suppression of the side reactions, such as cracking and oligomerization. The promoting effect of CO2on the dehydrogenation reaction is attributed to the reverse water gas shift reaction. The catalyst stability is also enhanced by the introduction of CO2.
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