摘要
详细研究了低温下固体酸催化剂上的正戊烷反应，发现在ＳＯ４＾２－／ＭｘＯｙ型固体超强酸，ＨＭ和ＨＺＳＭ－５沸石表面上正戊烷反应以异构化为主，其反应动力学符合一级可逆反应规律，催化剂的酸强度与正戊烷异构化反应速率常数呈顺变关系，由此提出了一种适合于－１６＜Ｈ０＜－１２的固体酸强度测定方法，解决了该区域内有色样品或高温易分解样品在酸性测量上的难题。
Pentane reactions on solid acids such as SO_4~2- /M.O., HM and HZSM-5 zeolites at low temPerature were studied. In most cases the pentane isomerization selectivity is higher than 90%. The rate of pentane isomerization reaction fOllows the rate law of a first-order reversible reaction. As the acid strength of the catalysts is increased, the rate constant is increased concurrently. The pentane isomerization at low temperature is a good probe reaction for the characterization of the acidity of solid superacids, whose Ho values are between -12 and -16. The results obtained rank the catalysts corlectly in order of increasing acidic strength as judged by Hanunett indicators and other methods.The probe reaction provides an effective means to measu-re superacidity for colored and decomposable samples.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1994年第10期897-902,共6页
Acta Physico-Chimica Sinica
基金
国家基础研究重大项目
中国石化总公司基金
关键词
正戊烷
异构化反应
固体超强酸
Solid superacid, Zeolite, Pentane isomerization, Characterization of superacidity
