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Determination of basic sites in Mg-Al mixed oxides by combination of TPD-CO2 and CO2 adsorption calorimetry
Authors: Smoláková Lucie | Frolich Karel | Troppová Ivana | Kutálek Petr | Kroft Eva | Čapek Libor
Year: 2017
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Place: Heidelberg
Page from-to: 1921-1929
Titles:
Language Name Abstract Keywords
cze Stanovení základních poloh v Mg-Al směsných oxidech pomocí kombinace TPD-CO2 a CO2 adsorpční kalorimetrie Prezentujeme kritickou analýzu využití CO2 adsorpční kalorimetrie/volumetrie a TPD-CO2 pro stanovení bazicity Mg-Al směsných oxidů. Cílem práce je popis a vývoj obou metod za předpokladu, že jsou tvořeny stejné typy CO2 adsorpčních komplexů. Kritické části těchto stanovení jsou diskutovány. Mg-Al směsné oxidy; bazicita; CO2 adsorpční kalorimetrie; TPD-CO2
eng Determination of basic sites in Mg-Al mixed oxides by combination of TPD-CO2 and CO2 adsorption calorimetry We present the critical analysis of the utilization of CO2 adsorption calorimetry/volumetry and TPD-CO2 for the determination of the Mg-Al mixed oxide basicity. The aim of work is the description and the evaluation of both methods with respect to the fact when the same types of CO2 adsorption complexes are involved. Critical parts of basic sites determination are originally discussed for both methods. In TPD-CO2, the process of the purging of non-specifically physisorbed CO2 is stressed. In CO2 adsorption calorimetry, the differential heat of CO2 distinguishing CO2 adsorption on weak basic sites and non-specific CO2 physisorption is stressed. Both methods are applied on series of selected Mg/Al mixed oxides varying in Mg/Al molar ratio and alkali co-cation. We show that the generally used TPD-CO2 does not provide complete information about basic sites since some weak sites form unstable CO2 species and these species could not be involved in TPD experiments. All our TPD-CO2 experiments reflect at 0-485 A degrees C those CO2 adsorbed in the range of the differential heat of CO2 above 30-32 kJ mol(-1). Mg-Al mixed oxides; Basicity; CO2 adsorption calorimetry; TPD-CO2

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