摘要
为了进一步提高H-FER分子筛的催化性能及稳定性,以水蒸气对其进行改性处理,并考察其对正丁烯骨架异构化的催化反应性能.结果表明:水蒸气处理可以有效调变H-FER分子筛的孔结构和酸性,且保持其晶型相对完整;当水蒸气流量和处理温度分别为1.0mL/min和370℃时,处理30min后的H-FER分子筛具有最佳的催化性能.X射线衍射和氮气吸脱附等表征结果表明:较高的水蒸气处理温度(370~420℃)和较大的水蒸气流量(1.0~3.0mL/min)可同时调控微孔和介孔的结构;介孔与微孔的合理匹配对H-FER催化剂的稳定性影响处于主要地位,酸性变化的影响则处于次要地位;此外,H-FER分子筛的微孔孔径不宜过大(<1.45nm),微孔和介孔的粒径比(dmicro/dmeso)也不应大于0.19,即微介孔的连通性相当重要.
The H-FER zeolite was modified by steam treatment so as to improve the catalytic performance and stability for the skeletal isomerization of n-butene.The results show that it can be efficiently modulated for the pore texture and acidity of H-FER zeolite via steam treatment and the corresponding crystalline structure can be kept after the treatment.The catalytic performance was the highest for H-FER zeolite treated with 1.0 mL/min and 370℃steam for 30 min.Then,according to the results of X-ray diffraction,N2-adsorption/desorption and other characterizations,the mesopore and micropore can be regulated with higher temperature(370-420℃)and flow rate(1.0-3.0 mL/min)of steam.Moreover,the rational match of micropore with mesopore plays significant roles in skeletal isomerization of n-butene,while the effect of acidity is believed to be less important.Moreover,the micropore of H-FER zeolite is also expected to be of a suitable size(<1.45 nm),and the diameter ratio of micropore to mesopore(d micro/d meso)should be less than 0.19.In other words,the connectivity of micro-mesopores is very important.
作者
郑弘光
陈文汉
水彩玲
郑进保
张诺伟
陈秉辉
ZHENG Hongguang;CHEN Wenhan;SHUI Cailing;ZHENG Jinbao;ZHANG Nuowei;CHEN Binghui(National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China;Department of Chemistry and Applied Chemistry,Changji College,Changji 831100,China)
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第5期669-677,共9页
Journal of Xiamen University：Natural Science
基金
中央高校基本科研业务费专项(20720170029)
