Seed-solution-induced Synthesis of FER Zeolite and Its Catalytic Application in the Skeletal Isomerization of n-Butene  

作　　者：Fan Jinlong Yang Fan Zhu Xuedong Xu Yarong Chen Lantian 

机构地区：[1]State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237 [2]Research Institute of Urumqi Petrochemical Company,Petrochina,Urumqi 830019

出　　处：《China Petroleum Processing & Petrochemical Technology》2023年第4期61-73,共13页中国炼油与石油化工（英文版）

基　　金：the funding of the project by the CNPC Corporation (2018B-1907)。

摘　　要：A series of Ferrierite(FER)zeolites were prepared via hydrothermal synthesis in the absence of organic templates with the aid of sodium-type FER zeolite(NaFER)or NaFER suspensions(NaFERsus)acquired by NaOH solution treatment as seeds.The differences in the structures and acid sites of the obtained FER zeolite catalysts arising from the choice of seed were investigated,and the catalytic performances of the obtained FER zeolites were evaluated in the skeletal isomerization of n-butene.The results indicate that the samples synthesized using NaFERsus feature more Br?nsted acid sites(BAS)in the 10-membered-ring(10-MR)at the expense of strong acid and Lewis acid sites(LAS),compared with samples derived from NaFER.Therefore,the FER samples synthesized using NaFERsus outperformed the NaFER counterparts as the BAS in 10-MR and LAS were the main active sites,while BAS in 8-MR and LAS were responsible for side reactions,such as polymerization,cracking,and carbon deposition in n-butene isomerization.The optimized FER catalyst was continuously used for 720 h at 350℃ at 0.1 MPa under an n-butene space velocity of 2.0 h^(-1),during which the n-butene conversion remained at>40%,and the isobutylene yield was>37.5%.

关 键 词：FER zeolites alkali treated seed solution N-BUTENE skeletal isomerization 

分 类 号：TQ426[化学工程] TQ221.213