摘要
介绍了固体酸催化剂酸性分析方法的研究进展,主要介绍了胺滴定法、红外光谱法、核磁共振法、程序升温脱附法及热分析法,并比较了这些分析方法的优缺点。目前人们广泛采用的是程序升温脱附和红外光谱法,前者可准确分析总酸量和酸强度,但无法区分酸的类型;而吡啶吸附红外光谱法可区分B酸和L酸,但对酸强度及总酸量的定量分析方面不很理想。新发展起来的31P核磁共振技术可较好地实现B酸和L酸的酸中心分布、酸量及酸强度的定性和定量分析。
Advances in acidity characterization methods for solid acid catalysts were reviewed. The methods, namely amine titration, IR spectroscopy, NMR spectroscopy, temperature programmed desorption （TPD）and thermal analysis, were compared. TPD and IR spectroscopy have widely been used in characterization nowadays. TPD can detect total acidity and acid strength, but can＇ t distinguish type of acids;while pyridine adsorption IR spectroscopy is sharp to distinguish B and L acid sites, but not satisfactory in determining total acidity and acid strength. Qualitative and quantitative analysis of acid site distribution, and acidity and acid strength of B and L acids can be carded out well by means of newly exploited 31p NMR method.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第7期607-614,共8页
Petrochemical Technology
关键词
固体酸
催化剂
胺滴定
核磁共振
红外光谱
程序升温脱附
热分析
酸性质
solid acid
catalyst
amine titration
nuclear magnetic resonance
infrared spectroscopy
temperature programmed desorption
thermal analysis
acid property
