论文部分内容阅读
使用程序升温表面反应的方法对氮化钼催化剂上的丁二烯吸附物种进行了考察 .结果表明 ,当用氢气对吸附丁二烯后的氮化钼进行吹扫时 ,表面大量脱附的是可逆吸附的σ π配位的C4物种 ;1 2 0℃脱附的产物可能是丁川物种 ;32 0℃ (钝化态为 360℃ )出现了丁二烯的加氢和裂解产物 ,为强吸附的碳氢物种 ;聚合物的脱附出现在1 2 0～ 360℃ ,其脱附温度随反应条件或催化剂的不同而变化 .新鲜态和钝化态催化剂在不同温度区域的脱附物种有所不同 ,根据催化剂表面上活性位的差异对此进行了讨论 .
Butadiene adsorption species on molybdenum nitride catalysts were investigated by using the method of temperature programmed surface reaction.The results showed that when hydrogen gas was used to purge the molybdenum nitride after butadiene adsorption, Reversible adsorption of σ π coordination of C4 species; 120 ° C desorption product may be Dingchuan species; 32 ° C (passivation state of 360 ° C) appeared butadiene hydrogenation and cracking products, as strong Adsorption of hydrocarbon species; the desorption of polymer occurs at 120 ~ 360 ° C, the desorption temperature varies with the reaction conditions or the catalyst varies.Fresh state and passivation catalyst in different temperature region desorption species are This is discussed based on differences in active sites on the catalyst surface.