Motion of NO2 radicals adsorbed on the surface of silica gel

Mikheikin, I. D.; Abronin, I. A.; Zhidomirov, G. M.; Kazanskii, V. B.

doi:10.1007/bf00529721

Cited by 5 publications

(5 citation statements)

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“…This concept was taken further by Mikheikin et al 63 and Ka- Á. The calculation correctly predicts a decrease in proton extraction energy from 16.76 to 14.96 eV in going from terminal Si-OH groups in silica gel to bridging OH clusters with only Al, A2 = Si ligands.…”

Section: Resultsmentioning

confidence: 93%

Nature of the framework hydroxyl groups in steamed H-RHO and H-erionite zeolites

Shannon¹,

Staley²,

Vega³

et al. 1989

J. Phys. Chem.

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Section: Resultsmentioning

confidence: 93%

Nature of the framework hydroxyl groups in steamed H-RHO and H-erionite zeolites

Shannon¹,

Staley²,

Vega³

et al. 1989

J. Phys. Chem.

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“…As the calcination temper ature of this sample was increased, the intensity of all types of absorption bands decreased to indicate its par tial dehydration. Consequently, the modification of aluminum oxide leads to the appearance of the Si-OH group, which is characterized by a higher bond atrength than the Al-OH groups [23,26]. Thus, it is well known that Si-OH groups possess high heat resis tance; they are observed on the surface of silica gel upon heat treatment up to 1400°С.…”

Section: Resultsmentioning

confidence: 99%

Effect of silica on the stability of the nanostructure and texture of fine-particle alumina

et al. 2012

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The effect of the modification of aluminum oxide with silicon oxide on the stability of fine parti cle γ and δ Al 2 O 3 phases upon heat treatment in the wide temperature range of 550-1500°C was studied. It was found that the γ and δ Al 2 O 3 phases modified with silica are thermally stable up to higher temperatures than pure aluminum oxide. This is due to changes in the real structure of the modified samples, specifically, an increase in the concentration of extensive defects stabilized by hydroxyl groups bound to not only alumi num atoms but also silicon atoms. It is likely that Si-OH groups, which are thermally more stable than Al⎯OH groups, stabilize the microstructure of γ and δ Al 2 O 3 to higher temperatures, as compared with alu minum oxide containing no additives. Simultaneously, an increase in the thermal stability of the modified samples is accompanied by the retention of a high specific surface area and a developed pore structure at higher treatment temperatures.

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“…Let us estimate the libration frequency of the DCO molecule in the model of a potential orientation box. The value of the square of the sine of the oscillation angle averaged over the energy levels of the particle in this potential box is given by the following expression [23]:…”

Section: Resultsmentioning

confidence: 99%

“…The obtained values of amplitudes, 19.63 • , 16.92 • , 9.06 • , 5.20 • , for CH 3 , in the matrices N 2 , CO, N 2 O, CO 2 , respectively, turned out to be surprisingly close to the averaged angular deviations of matrix molecules[25]: 19.49 • , 14.67 • , 5.57 • , 5.17 • . At low temperatures with only the ground libration level populated, the amplitude of the librations of the molecule in the potential box does not depend on the inertia tensor of the molecule and is determined only by the width of the box[23], which in turn is different for different matrices. The inertia moments of CO, CH 3 , DCO are equal to 14.76 • 10 −47 , 2.97 • 10 −47 , 1.20 • 10 −47 kg•m 2 respectively.…”

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confidence: 99%

Anisotropic saturation of the EPR spectrum of an DCO radical stabilized in solid CO at 4.2 K and its orientation motion

2022

Optics and Spectroscopy

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Formyl radicals, DCO, were produced in solid CO matrix and studied by EPR using gas deposition technique on a cold substrate at 4.2 K. The radical electron spin-lattice relaxation was measured to be anisotropic. The anisotropy was found to originate from the anisotropic orientational motion of the radical with the most intensive librations performed around a z axis corresponding to the smallest moment of inertia of the molecule. It was shown that, in solid CO, the libration motion of small molecules is modeled by considering a particle rotating in the orientational potential box. A suggestion was substantiated about the complicated nature of the orientational motion of HCO in the solid CO matrix including the intensive librations and slow tunneling rotation of the molecule around the z axis. Keywords: electron paramagnetic resonance, matrix isolation, formyl radical, anisotropy of the spin-lattice relaxation time, librations and tunneling rotation of molecules.

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Motion of NO2 radicals adsorbed on the surface of silica gel

Cited by 5 publications

References 1 publication

Nature of the framework hydroxyl groups in steamed H-RHO and H-erionite zeolites

Nature of the framework hydroxyl groups in steamed H-RHO and H-erionite zeolites

Effect of silica on the stability of the nanostructure and texture of fine-particle alumina

Anisotropic saturation of the EPR spectrum of an DCO radical stabilized in solid CO at 4.2 K and its orientation motion

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