Influence of thermal treatments on the basic and catalytic properties of Mg,Al-mixed oxides derived from hydrotalcites



Document title: Influence of thermal treatments on the basic and catalytic properties of Mg,Al-mixed oxides derived from hydrotalcites
Journal: Brazilian journal of chemical engineering
Database: PERIÓDICA
System number: 000308931
ISSN: 0104-6632
Authors: 1

2

Institutions: 1Universidade Federal do Rio de Janeiro, Instituto Alberto Luiz Coimbra de Pos-Graduacao e Pesquisa de Engenharia, Rio de Janeiro. Brasil
2Universidade do Estado do Rio de Janeiro, Instituto de Quimica, Rio de Janeiro. Brasil
Year:
Season: Jun
Volumen: 21
Number: 2
Pages: 193-202
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract This work studied the influence of calcination conditions on basic properties and catalytic performance of Mg,Al-mixed oxides derived from a hydrotalcite sample (Al/(Al+Mg)=0.20). Various heating rates, calcination atmospheres and lengths of calcination at 723K were evaluated. TPD of CO2 and retroaldolization of diacetone alcohol (DAA) were used to determine the basic properties of the mixed oxides. The basic site density determined by TPD of CO2 showed a better correlation with catalytic activity for acetone/citral aldol condensation than the relative basicity obtained from retroaldolization of DAA. Calcination atmosphere was the parameter that influenced most the basic and the catalytic properties of the Mg,Al-mixed oxides, with calcination under dry air being the best choice
Disciplines: Química
Keyword: Ingeniería química,
Catalizadores,
Hidrotalcitas,
Tratamiento térmico,
Condensación aldólica,
Citral,
Acetona
Keyword: Chemistry,
Chemical engineering,
Catalysts,
Hydrotalcites,
Thermal treatment,
Aldol condensation,
Citral,
Acetone
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