Li、Na、K对Pd基脱氧催化剂的影响  

The Influence of Li, Na and K on Pd-based Deoxidation Catalysts

作　　者：赵晋翀 Zhao Jinchong(State Key Laboratory of Chemical Safety,Shandong,Qingdao,266104;SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Shandong,Qingdao,266104)

机构地区：[1]化学品安全全国重点实验室,山东青岛266104 [2]中石化安全工程研究院有限公司,山东青岛266104

出　　处：《安全、健康和环境》2023年第10期44-48,69,共6页Safety Health & Environment

摘　　要：制备得到了一系列碱金属(Li、Na、K)修饰的Pd催化剂和未经修饰的催化剂Pd/Al_(2)O_(3),并在氢气条件下考察了系列催化剂去除丙烯中氧气的性能。结果表明,碱金属可以增强Pd基催化剂的脱氧性能,其修饰效果遵循以下顺序:K>Na>Li。通过X射线衍射(XRD)、N_(2)吸附、透射电子显微镜(TEM)、氢气程序升温还原(H_(2)-TPR)等技术对碱金属修饰的Pd催化剂进行了表征,并讨论了碱金属改性对Pd催化剂脱氧效率与选择性的影响。结果表明,碱金属的加入可以改善Pd物种的化学稳定性,减少临氢环境下Pd基催化剂中对烯烃加氢反应有促进作用的β-PdH的形成,从而减弱催化剂的丙烯烃加氢性能。其中,Pd-K/A催化剂在氧气脱除和丙烯加氢饱和抑制方面表现最好。A series of alkali metals(Li,Na,K)modified Pd-based catalysts and unmodified Pd/Al_(2)O_(3) were prepared and used to remove oxygen in a propylene flow with hydrogen exist.The results showed that the alkali metals could enhance the deoxidation performance of the Pd catalysts and the effect followed the order of K>Na>Li.The alkali metal modified Pd catalyst was characterized by X-ray diffraction(XRD),N_(2) adsorption,transmission electron microscopy(TEM)and hydrogen temperature programming reduction(H_(2)-TPR),and the effect of alkali metal modification on the deoxidation efficiency and selectivity of Pd catalyst was discussed.The results showed that the addition of alkali metals could improve the chemical stability of Pd species,reduce the formation ofβ-PdH,which can promote the olefin hydrogenation reaction in Pd-based catalyst under hydrogen environment,and weaken the propylene hydrogenation performance of the catalyst.Among them,Pd-K/A catalyst had the best performance in oxygen removal and propylene hydrogenation saturation inhibition.

关 键 词：PD催化剂 碱金属 临氢环境 丙烯 脱氧 

分 类 号：TQ426[化学工程]