Proprietăţile sorbţionale şi catalitice ale montmorilonitului intercalat cu oligomeri de aluminiu [Articol]
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Universitatea de Stat din Moldova
Abstract
Efectul chemi-luminescenţei luminolului prezintă un procedeu eficace de estimare comparativă a activităţii catalitice a catalizatorilor. S-a constatat că cel mai pronunţat efect catalitic, având o intensitate a chemi-luminescenţei de 18 ori mai mare faţă de martor, posedă H-forma Al-montmorilonitului intercalat cu oligomeri de aluminiu la raportul molar iniţial OH-/Al3 2:1, după intercalare calcinat la 450oC. Această mostră posedă de asemenea o eficienţă mai bună (94%) de oxidare a metiloranjului în prezenţa H2O2 şi aciditate de tipul Brönsted mai pronunţată.
The luminol chemiluminescence effect presents an effective procedure for comparative assessment of the catalytic activity of the catalysts. It was found that the most pronounced catalytic effect, having a chemiluminescence intensity about 18 times higher compared to the control sample, possess Al-pillared montmorillonite, obtained at initial molar ratio OH-/Al3 2:1, afterwards calcined at 450oC and transformed into H-form. This sample also possess better efficiency (94%) of oxidation of the methyl-orange in the presence of H2O2 and more enhanced Brönsted acidity.
The luminol chemiluminescence effect presents an effective procedure for comparative assessment of the catalytic activity of the catalysts. It was found that the most pronounced catalytic effect, having a chemiluminescence intensity about 18 times higher compared to the control sample, possess Al-pillared montmorillonite, obtained at initial molar ratio OH-/Al3 2:1, afterwards calcined at 450oC and transformed into H-form. This sample also possess better efficiency (94%) of oxidation of the methyl-orange in the presence of H2O2 and more enhanced Brönsted acidity.
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RUSU, Vasile; Raisa NASTAS; Nina ŢÎMBALIUC; Alexandru GONŢA și Alexei MAFTULEAC. Proprietăţile sorbţionale şi catalitice ale montmorilonitului intercalat cu oligomeri de aluminiu. Studia Universitatis Moldaviae. Seria Științe Reale și ale Naturii. 2014, nr. 1(71), pp. 166-174. ISSN 1814-3237. E-ISSN 1857-498X.