Acid properties of AlMCM-41 molecular sieves with different silica-alumina ratios by thermogravimetry

被引：12
作者：
Souza, MJB
Silva, AOS
Fernandes, VJ
Araujo, AS
机构：
[1] Univ Fed Rio Grande Norte, Dept Chem, BR-59078970 Natal, RN, Brazil
[2] Univ Fed Rio Grande Norte, Dept Chem Engn, BR-59078970 Natal, RN, Brazil
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2005年 / 79卷 / 02期
关键词：
acidity; AlMCM-41; pyridine; Si/Al ratio;
D O I：
10.1007/s10973-005-0078-y
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A series of A1MCM-41 molecular sieves were synthesized starting from a hydrogel keeping the following molar composition: 1CTMABr:4.58SiO(2):(0.437+X)Na2O:XAl2O3:200H(2)O. Tetramethylammonium silicate (TMAS) was used as silicon source and cethyltrimethylammonium bromide (CTMABr) was used as structure template. The obtained materials were characterized by nitrogen adsorption, XRD and TG/DTG. Acid properties were determined by pyridine thermodesorption. Model-free and Flynn-Wall kinetic models were used in order to correlate the total acidity with the apparent activation energy of pyridine desorption.
引用
收藏
页码：425 / 428
页数：4
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