摘要
本文应用碱性气体吸附的红外光谱和ＴＰＤ技术研究了ＦｅＺＳＭ－５（Ｆ＿４）的酸性，酸性顺序为：Ｈ－Ｆ＿４＞Ｆｅ＿２Ｏ＿３／Ｆ＿４＞Ｆ＿４原粉＞水热处理的Ｋ－Ｆ＿４＞Ｌｉ－Ｆ＿４＞ＮａＦ＿４＞Ｋ－Ｆ＿４＞ＮａＯＨ／Ｆ＿４，比较了酸强度和积炭对乙苯氧化脱氢性能的影响，以及催化剂酸碱性质与积炭的关系．结果表明，乙苯氧化脱氢反应是在酸碱协同作用下进行的，积炭也参与了氧化脱氢反应，催化剂表面上Ｌ酸中心产生的具有一定Ｃ、Ｈ、Ｏ比的积炭具有高的氧化脱氢活性．碱金属阳离子改性的具有Ｌ酸中心的ＦｅＺＳＭ－５是乙苯氧化脱氢的高活性催化剂。
The acidity of FeZSM-5(F_4) zeolites have been studied by IR spectra and TPD technique of adsorption NH_3 and pyridine,and the order of H-F_4>Fe_2O_3/F_4>as-synthesized F_4>hydrothermal treated K-F_4>Li-F_4>Na-F_4>K-F_4>NaOH/ F_4 was given. The effect of acidity-basicity and precentage of coke on the catalytic activity was compared. The relation of acidity- basicity and precentage of coke was also examined. The results indicate that oxydehydrogenation reaction of ethylbenzene takes place under the synergetic action of acidic and basic centers. Coke takes part in oxydehydrogenation reaction,too. Coke with a certain proportion for C,H, O produced in the Lewis acid centers on the surface of catalyst possesses the high activity of oxydehydrogenation.FeZSM-5 with alkali cation and Lewis acidic centres is a highly active catalyst for oxydehydrogenation of ethylbenzene.
出处
《分子催化》
CSCD
1995年第2期111-117,共7页
Journal of Molecular Catalysis(China)
基金
国家自然科学基金
关键词
乙苯
氧化
脱氢
积炭
铁硅酸盐
分子筛
催化
FeZSM-5
Oxydehydrogenation of ethylbenzene
Ionsexchange
Coke
Aciditybasicity.
