Differential Scanning Calorimetry Evaluates Relative Proportions and Strength of Acid-Sites in Catalytic Materials and Adsorbents Alumina and Amorphous Silica-Alumina
作者:
A.K. Aboul-gheit,
M.A. Al-hajjaji,
期刊:
Analytical Letters
(Taylor Available online 1987)
卷期:
Volume 20,
issue 4
页码: 553-559
ISSN:0003-2719
年代: 1987
DOI:10.1080/00032718708067988
出版商: Taylor & Francis Group
关键词: DSC;acidity proportion;acidity strength;catalytic materials and adsorbents;alumina;silica-alumina.
数据来源: Taylor
摘要:
Differential scanning calorimetry (DSC) is employed to evaluate the relative proportions and strength of acid-sites in gammaalumina and amorphous silica-alumina through presorption of tri-ethylamine (TEA) followed by its thermal desorption in the DSC equipment. From the data obtained, total acid-sites in silica-alumina is found to be 2.3 times as large as those present in gamma-alumina, and 5–5% of total acidity in alumina is of Bronsted type whereas in silica-alumina this type comprises 28.9%' The Bronsted acidity strength in alumina and silica-alumina is identical although greatly different in quantity. Lewis acidity in silica-alumina is significantly stronger than that in alumina.
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