摘要
用吡啶和位阻胺吸附、吡啶吸附红外光谱（ＩＲ）、氨程序升温脱附（ＴＰＤ）和微反活性试验（ＭＡＴ）对比考察了目前工业上使用的几种超稳Ｙ沸石（ＵＳＹ、ＲＥＹ、ＳＲＮＹ、ＦＳＹ）及作者改进的超稳Ｙ沸石（ＩＩＳＹ）的酸密度、酸强度变化情况及微反活性。结果表明，酸性及活性的变化情况与沸石制备方法有关。Ｂ酸强度随骨架硅铝比的升高而增强，其密度随温度升高急剧减少。Ｂ酸对活性有明显的影响。Ｌ酸中心强度随硅铝比升高变化很少。除ＲｅＹ外，Ｌ酸密度随温度升高减少的程度远比Ｂ酸慢，在一定的温度范围内基本不变。
By mean:of NH_3-TPD,pyridine and 2,6-dimethyl pyridine adsorption, IR of adsorbedpyridine, and MAT,it has been shown that the acidity and activity of ultrastable Y zeolitesvary with the preparation method of the tested samples. The acid density of SRNY,FSYand HSY decreases with increasing temperature more slowly than that of USY. SRNY,FSYand HSY have a greater proportion of strong acid site than USY. It seems that2,6-dimethylpyridine is adsorbed not only at B-acid site but also at L-acid site.
出处
《石油化工》
CAS
CSCD
北大核心
1994年第8期498-501,共4页
Petrochemical Technology
基金
国家自然科学基金
关键词
沸石
酸性
活性
渣油
裂化催化剂
ultrastable Y zeolites,acidity,activity,2,6-dimethyl pyridine
