摘要
以NaY、HY、液相Ce离子交换改性Y分子筛(L-CeY)为研究对象,运用Py-FTIR和NH3-TPD对Y型分子筛的酸类型、酸强度、酸量进行了表征;采用原位红外光谱技术研究了噻吩在Y型分子筛上的吸附和转化行为。结果表明,分子筛的B酸位是噻吩发生质子化及低聚反应的活性中心。Y型分子筛对噻吩的催化活性顺序为L-CeY>HY,这可由Y型分子筛B酸位的量和强度区别以及稀土离子物种与B酸中心的协同作用进行解释。
Surface acidities of the Y zeolites （NAY, HY, L-CeY） were characterized by in-situ Py-FTIR and NH3-TPD methods. The adsorption and catalytic transformation behaviors of thiophene on Y zeolites were studied by in-situ FTIR technique. The results indicate that Bronsted （B） acid sites of Y zeolites play an important role in the progress of protonation and oligomerization. The order of catalytic properties of Y zeolites is L-CeY 〉 HY, which can be attributed to the concentration and strength of the surface acidities and the synergy between rare-earth ions species and Bronsted （13） acid sites.
出处
《石油化工高等学校学报》
CAS
2014年第4期11-15,共5页
Journal of Petrochemical Universities
基金
国家自然科学基金项目(20976077
21076100)
中国石油天然气股份有限公司炼油催化剂重大专项(10-01A-01-01-01)
