Exploring the joint influence of SO2 and alkali metal on FeW mixed oxides catalyst for NO  elimination

Wang, Hui; Gong, Lei; Feng, Chao; Xin, Bingyi; Wang, Zhong; Qu, Zhenping

doi:10.1016/j.jece.2024.113018

Journal of Environmental Chemical Engineering

2024

DOI: 10.1016/j.jece.2024.113018

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Exploring the joint influence of SO2 and alkali metal on FeW mixed oxides catalyst for NO elimination

Hui Wang,

Lei Gong,

Chao Feng

et al.

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Determination of surface acidity of mixed oxide of silicon and titanium by calorimetric titration

Guzzoni,

Bassani,

Camillo

et al. 2024

Cad. Pedagógico

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Silica-titania mixed oxide with catalytic and adsorption properties has been of great academic and industrial interest. Metal oxides supported on silica have been used as a matrix for immobilizing electron transfer mediators, generating materials with diverse properties. The characterization of the surface acidity of these materials is essential and has been carried out using various techniques, including IR spectroscopy and calorimetry. However, no single technique completely analyses the present acidic sites. This study used calorimetric titration to investigate a mixed oxide containing titanium and silica, prepared by the sol-gel method, and its interaction with pyridine. The results showed that thermal treatment increased the enthalpy values (ΔH), indicating water removal from the matrix surface. The presence of pyridine resulted in a decrease in ΔH values, suggesting a preferential occupation of the stronger acidic sites. After thermal treatments between 473 and 573 K, the solids exhibited similar ΔH values, indicating a homogenization of the surface acidic sites. Calorimetric analysis revealed that the acidic sites were occupied in descending order of strength, with the strongest sites being filled initially. The increase in temperature did not result in new acidic sites but rather in greater occupation of the existing ones. Correlation between calorimetric and infrared data is suggested as the next investigation step. Thus, the results of this study contribute to a deeper understanding of the physicochemical properties, especially regarding their surface acidity, with the potential for more effective and controlled practical applications of this silica-titania mixed oxide in catalysis and adsorption.

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Determination of surface acidity of mixed oxide of silicon and titanium by calorimetric titration

Guzzoni,

Bassani,

Camillo

et al. 2024

Cad. Pedagógico

View full text Add to dashboard Cite

show abstract

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Exploring the joint influence of SO2 and alkali metal on FeW mixed oxides catalyst for NO elimination

Cited by 1 publication

References 46 publications

Determination of surface acidity of mixed oxide of silicon and titanium by calorimetric titration

Determination of surface acidity of mixed oxide of silicon and titanium by calorimetric titration

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