Na-W-Mn-Zr-S-P/SiO_2催化剂上乙烷氧化脱氢反应

研究了甲烷氧化偶联六组分Na-W-Mn-Zr-S-P/SiO_2催化剂对乙烷氧化脱氢反应的催化性能.考察了不同原料气配比、温度和空速等条件下的催化剂活性.讨论了催化剂中S或P组分的含量对催化活性的影响.实验结果表明,S和P元素的加入可以提高催化剂的活性.660℃时六组分催化剂上乙烷的转化率为65.2%,乙烯的选择性为83.2%,此时得到的乙烯收率最高.乙烷与氧气比的增加有利于提高乙烯的选择性.较低反应温度时,空速的增加可以抑制碳氧化物(CO,CO_2)的生成,提高乙烯选择性.

Catalytic Performance of Na-W-Mn-Zr-S-P/SiO_2 Catalyst for Oxidative Dehydrogenation of Ethane

Performance for oxidative dehydrogenation of ethane catalyzed by Na-W-Mn-Zr-S-P/SiO_2 catalyst which exhibited high performance for the oxidative coupling of methane was investigated.The effects of reaction conditions and different contents of S or/and P in the catalyst were discussed.According to the experimental results, it was found that the additions of S or/and P to the Na-W-Mn-Zr/SiO_2 catalyst could improve the activity of the catalyst.The highest activity of catalysts was obtained at the temperature of 660 ℃ over the six-component Na-W-Mn-Zr-S-P/SiO_2 catalyst, on which the ethane conversion and ethylene selectivity were 65.2% and 83.2%, respectively.High volume ratio of ethane to oxygen was favorable to the selectivity of ethylene.At lower temperature,the increase of space velocity could inhibit the generations of CO and CO_2 and increase the selectivity of ethylene.prepared