摘要
用NaOH溶液对高硅ZSM-5分子筛进行处理,考察其应用于苯-甲醇烷基化反应过程的最佳处理条件,并用XRD、SEM、XRF、NH3-TPD、TPO、BET等手段对试样进行表征。结果表明,NaOH在脱除分子筛硅物种的同时,也会脱出晶粒表面附着物,暴露出更多的酸性位,形成一定量的介孔,进而影响苯-甲醇烷基化性能。当NaOH处理量为2.4mmol/gcat时,在液体积空速为85h^-1下,烷基化反应中苯的转化率达到38%,相比处理前提高了近16%,且积炭量低,稳定性好。
High-silicon ZSM-5 zeolite was treated with NaOH solution to investigate the effect of modification on benzene-methanol alkylation. The physicochemical properties of the samples were characterized by XRD, SEM, XRF, NH 3-TPD, TPO, and BET. The results showed that NaOH treatmeng removed the molecular sieve silicon species and the surface deposits, revealed more acid sites, formed certain amount of mesopores, which affected the alkylation performance of benzene-methanol. When the NaOH treatment amount was 2.4 mmol/g cat , the conversion rate of benzene in the alkylation reaction reached 38% at a liquid volume space velocity of 85 h^-1 , which was nearly 16% higher than that before treatment, and the modified catalyst had low carbon deposition and better stability.
作者
高玥
黄星亮
字琴
彭文宇
张鑫
田洪锋
董乐
刘宗俨
GAO Yue;HUANG Xing-liang;ZI Qin;PENG Wen-yu;ZHANG Xin;TIAN Hong-feng;DONG Le;LIU Zong-yan(College of Chemical Engineering,China University of Petroleum (Beijing),Beijing 102249,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2019年第9期1104-1110,共7页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(21576288)资助~~
关键词
苯
甲醇
骨烷基化
ZSM-5
催化剂
碱改性
benzene
methanol
alkylation
ZSM-5 catalyst
alkali modification
