Ni@ZSM-5催化剂的制备及其甲烷部分氧化反应性能的研究

Preparation of Ni@ZSM-5 catalyst and its reaction performance for partial oxidation of methane

采用N-(2-氨乙基)-3-氨丙基三甲氧基硅烷(TPE)作为配体,通过水热合成法将Ni金属原位封装在ZSM-5沸石中的催化剂Ni@ZSM-5,并考察了镍引入量和晶化温度对催化剂的甲烷部分氧化(POM)催化性能的影响。结果表明:两段晶化法制备的ZSM-5结晶度更高,有更规整的孔道结构;Ni@ZSM-5中金属颗粒分散较为均匀,载体孔道限制作用能有效抑制金属晶粒的长大,催化剂更加稳定;相比浸渍法制备的Ni/ZSM-5催化剂,原位合成的Ni@ZSM-5催化剂具有更高的POM反应性能,甲烷转化率达95%。

Using N-[3-(trimethoxysilyl)propyl]ethylenediamine(TPE)as the ligand,Ni@ZSM-5 catalyst was prepared by in-situ encapsulation of Ni in ZSM-5 zeolite by hydrothermal synthesis,and the effects of the amount of nickel introduced and the crystallization temperature on the catalytic performance of the catalyst for partial oxidation of methane(POM)were investigated.The results showed that the ZSM-5 prepared by the two-stage crystallization method had higher crystallinity and more regular pore structure;the Ni metal particles in Ni@ZSM-5 were more uniformly dispersed,and the pore restriction effect of the support could effectively inhibit the growth of Ni crystal grains,resulting in more stable catalyst;compared with the Ni/ZSM-5 catalyst prepared by the impregnation method,the in-situ synthesized Ni@ZSM-5 catalyst had higher POM reaction activity,and the methane conversion reached 95%.