Characterization of active sites of Pd/Al2O3 model catalysts with low Pd content by luminescence, EPR and ethane hydrogenolysis

Vedyagin, Aleksey A.; Volodin, Alexander M.; Stoyanovskii, Vladimir O.; Mishakov, Ilya V.; Medvedev, Dmitrii A.; Носков, А. С.

doi:10.1016/j.apcatb.2011.02.002

Cited by 70 publications

(53 citation statements)

References 45 publications

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“…This method was described in detail elsewhere. [27][28][29][30] Prior to adsorption of the probe molecules the samples were dehydrated in air at 500 C for 12 h. The electron-acceptor surface sites were studied using an antracene adsorption from 5 Â 10 À2 M solution in toluene. The electron-donor sites were characterized using adsorption of 1,3,5-trinitrobenzene from 2 Â 10 À2 M solution in toluene.…”

Section: Methodsmentioning

confidence: 99%

“…30 The electron-donor sites on the surface of alumina and zirconia are responsible for the stabilization of the atomically dispersed forms of deposited noble metals having high activity in a model reaction of CO oxidation and improved stability at elevated temperatures. 27,32,34,35 Typical EPR spectra observed aer the anthracene adsorption on the surface electron-acceptor sites are shown in Fig. 8A.…”

Section: Elimination Of the Carbon Coatingmentioning

confidence: 99%

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Nanocrystalline carbon coated alumina with enhanced phase stability at high temperatures

et al. 2017

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Section: Methodsmentioning

confidence: 99%

Section: Elimination Of the Carbon Coatingmentioning

confidence: 99%

Nanocrystalline carbon coated alumina with enhanced phase stability at high temperatures

et al. 2017

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“…Earlier direct correlations were observed between the concentrations of such sites and the catalytic activity in low-temperature CO oxidation, n-butane isomerization and ethanol dehydration. 32,54,55 A strong signal of TNB radical anions characterized by anisotropic splitting on a nitrogen atom with A zz = 27.2 G was observed on the AP-MgO sample after activation in nitrogen flow without any reaction. 56 Its intensity on activated AP-MgO before reaction was about 6×10 18 g -1 .…”

Section: Characterization Of Electron-donor and Electron-acceptor Sitmentioning

confidence: 97%

Study of MgO transformation into MgF2 in the presence of CF2Cl2•

Vedyagin

Bedilo

Mishakov

et al. 2017

JSCS

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Alkaline-earth metal oxide aerogels prepared by sol-gel method followed by autoclave drying are nanocrystalline mesoporous materials with high reactivity. Bulk solid-state reaction of MgO aerogels with CF 2 Cl 2 takes place after a long induction period, during which the active sites are accumulated on the surface of the nanoparticles. It was found that vanadium addition has a promoting effect on this reaction accelerating the process of the active sites formation. A method for characterization of electron-acceptor sites by electron spin resonance spectroscopy using perylene as the spin probe was developed. A good correlation was observed between the rate of the CF 2 Cl 2 destructive sorption and the concentration of weak electron-acceptor sites. Simplified models of such sites were suggested. The acid sites on the modified MgO surface were supposed to be originated from separation of the charged fragments resulting in the surface polarization. Uncompensated oxygen substitution for chlorine and/or fluorine ions leads to appearance of Lewis acid sites while HCl/HF chemisorption results in Bronsted acid sites formation.

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“…Среди современных учёных, развивающих тематику применения ароматических молекул в исследовании катализаторов на основе оксида алюминия методом ЭПР, в первую очередь следует выделить Бедило, Володина и коллег [35][36][37][38][39]. В одной из своих работ [35] ими было проведено исследование процесса формирования парамагнитных частиц на поверхности цеолитов при высокотемпературной (до 500 °C) адсорбции бензола, толуола и фенола.…”

Section: современное состояние проблемы использования метода эпр аромunclassified

Особенности Применения Ароматических Молекул-Зондов Для ЭПР -Спектроскопии В Исследовании Кислотных Свойств Поверхности Модифицированных Алюмооксидных Каталитических Систем

Yurpalov¹,

Drozdov²,

Nepomnyashchy³

et al. 2019

РХЖ

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Current paper systematizes the work devoted to the application of the aromatic spin probe EPR spectroscopy for the study of heterogeneous alumina catalysts, as well as supplemented by new researches carried out in IHP SB RAS. The advances of the method and the mechanism of probe molecules interaction with active surface sites and their nature are considered. There are noted some contradictions in views on mechanisms, nevertheless the modern point of view tends to participate BAS in the ionization of aromatic probe molecules.

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Characterization of active sites of Pd/Al2O3 model catalysts with low Pd content by luminescence, EPR and ethane hydrogenolysis

Cited by 70 publications

References 45 publications

Nanocrystalline carbon coated alumina with enhanced phase stability at high temperatures

Nanocrystalline carbon coated alumina with enhanced phase stability at high temperatures

Study of MgO transformation into MgF2 in the presence of CF2Cl2•

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