The effect of impregnation conditions on the surface structure of silica-supported CuO catalysts

Autor:	Suzy A. Selim, Hamdy A. Hassan, Raouf Sh. Mikhail, Mohamed Abdel-Khalik
Rok vydání:	1981
Předmět:	Materials science Inorganic chemistry chemistry.chemical_element Microporous material Condensed Matter Physics Copper Silicate Catalysis Amorphous solid chemistry.chemical_compound chemistry Chemical engineering Surface structure Physical and Theoretical Chemistry Instrumentation
Zdroj:	Thermochimica Acta. 45:349-360
ISSN:	0040-6031
DOI:	10.1016/0040-6031(81)85094-0
Popis:	CuO/SiO2 catalysts with varying amounts of copper were prepard using meso- and microporous silica supports at pH > 10 and pH = 4.5. Structural and textural changes were followed using X-ray diffraction, TG and DTA techniques. Impregnation for periods > 10 days at high pH produces crystalline catalysts with two distinct peaks at d-spacings of 2.33 and 2.03 A resulting from a surface silicate which is structurally stable up to 800°C. At copper concentrations > 5% CuO also forms. Catalysts prepared at pH = 4.5 are amorphous to X-rays in spite of the presence of CuO which may either be
Databáze:	OpenAIRE
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