改性X分子筛甲醇/甲苯共吸附原位红外表征  

Characterization of coadsorption of methanol and toluene on modified X zeolite by in situ FTIR

作　　者：张荆清[1] 王建强[1] 蒋见[1] 袁志庆[1] 许中强[1] 

机构地区：[1]中国石化上海石油化工研究院,上海201208

出　　处：《石油化工》2016年第1期64-68,共5页Petrochemical Technology

摘　　要：采用原位红外光谱法表征了负载一定量KOH和H_3BO_3的X分子筛催化剂,分析了不同改性分子筛上甲醇/甲苯吸附的原位红外特征峰,考察了KOH浓度和不同H_3BO_3负载量对改性的X分子筛甲醇/甲苯共吸附的影响,并研究了原位红外光谱定量分析结果与催化剂性能的关联性。实验结果表明,采用甲醇吸附在分子筛上的特征峰(2 824 cm^(-1))和甲苯吸附在分子筛上的特征峰(1 596 cm^(-1))的峰面积和峰面积比值可有效定量X分子筛酸碱性对甲醇/甲苯的吸附能力的影响;原位红外光谱表征结果可与催化剂性能相关联,为开发高性能甲醇/甲苯侧链烷基化反应的催化剂提供了一种重要的研究途径。A series of X zeolite catalysts with KOH and H3BO3 were characterized by means of in situ FTIR and the adsorption/coadsorption of methanol and/or toluene on the modified X zeolite catalysts were investigated. The influences of KOH concentration and H3BO3 loading on the coadsorption of methanol/toluene were studied. The relationship between the quantitative results of the coadsorption and the catalyst performances was researched. It was showed that, the peak areas and the area ratios of the methanol characteristic peak at 2 824 cm-1 and the toluene characteristic peak at 1 596 cm-1 could be used to quantitatively describe the adsorption capacity of the catalysts to methanol and toluene, and the in situ FTIR results could be correlated with the performances of the catalysts. The quantitative-analysis method can provide an important approach for developing high performance catalysts used in the side-chain alkylation of methanol and toluene.

关 键 词：原位红外光谱 X分子筛 甲醇 甲苯 共吸附 侧链烷基化反应 

分 类 号：TQ203.2[化学工程—有机化工]