SURFACE HYDROXYL GROUPS ON γ-ALUMINA<sup>1</sup>

Peri, J. B.; Hannan, R. B.

doi:10.1021/j100839a044

Cited by 492 publications

(187 citation statements)

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“…The bands at 2578 cm -1 is the characteristic frequency of ν s (SH) of surface HS. 20,21 The peak at 3755 cm -1 for surface hydroxyl 22 decreased in intensity as a function of time. The bands at 1659 and 1409 cm -1 were assigned to ν as (OCO) and ν s (OCO) of surface HCO 3 -species, which were accompanied by ν(OH) and δ(OH) at 3618 and 1225 cm -1 , respectively.…”

Section: Heterogeneous Reaction Of Ocs On Mgo In Closedmentioning

confidence: 98%

Mechanism of Heterogeneous Reaction of Carbonyl Sulfide on Magnesium Oxide

2007

J. Phys. Chem. A

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Heterogeneous reaction of carbonyl sulfide (OCS) on magnesium oxide (MgO) under ambient conditions was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), quadrupole mass spectrometer (QMS), and density functional theory (DFT) calculations. It reveals that OCS can be catalytically hydrolyzed by surface hydroxyl on MgO to produce carbon dioxide (CO 2 ) and hydrogen sulfide (H 2 S), and then H 2 S can be further catalytically oxidized by surface oxygen or gaseous oxygen on MgO to form sulfite (SO 3 2-) and sulfate (SO 4 2-). Hydrogen thiocarbonate (HSCO 2 -) was found to be the crucial intermediate. Surface hydrogen sulfide (HS), sulfur dioxide (SO 2 ), and surface sulfite (SO 3 2-) were also found to be intermediates for the formation of sulfate. Furthermore, the surface hydroxyl contributes not only to the formation of HSCO 2but also to HSCO 2decomposition. On the basis of experimental results, the heterogeneous reaction mechanism of OCS on MgO was discussed.

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Section: Heterogeneous Reaction Of Ocs On Mgo In Closedmentioning

confidence: 98%

Mechanism of Heterogeneous Reaction of Carbonyl Sulfide on Magnesium Oxide

2007

J. Phys. Chem. A

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“…[12,13]. The presence of hydroxyl groups at the surface has been shown by deuterium exchange and infrared (IR) spectroscopy and chemical methods [12][13][14]. The IR spectrum of the oxides show bands between 3300 cm -1 and 3800 cm -1 , typical of surface OH groups [15].…”

Section: Photoacoustic Studymentioning

confidence: 99%

“…The difference in thermal diffusivity values may be attributed to the difference in the preparation method. [12,13]. The presence of hydroxyl groups at the surface has been shown by deuterium exchange and infrared (IR) spectroscopy and chemical methods [12][13][14].…”

Section: Photoacoustic Studymentioning

confidence: 99%

Effect of Sample Preparation Route on the Thermal Diffusivity of Nd2O3 - A Laser Induced Photoacoustic Study

Sankararaman¹

2016

Journal of Materials Science and Nanotechnology

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“…Another indicator of the activation of hydrogen on oxide surfaces is the exchange of OH to OD groups in presence of D 2 , which can be monitored by IR spectroscopy [14,41,42]. This exchange occurs on both alumina [42][43][44] and silica [41,45] at elevated temperatures; again, thermal activation of the materials seems to be important. Carter et al [42] found a logarithmic rate law for the exchange on alumina.…”

Section: Introductionmentioning

confidence: 99%

Activation of dihydrogen on supported and unsupported silver catalysts

Hohmeyer

Kondratenko

Bron

et al. 2010

Journal of Catalysis

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The activation of dihydrogen on silica, silver, and silica-supported silver (9 wt% Ag) was investigated. Both, silica and silver are individually able to dissociate dihydrogen. Silanol groups on silica undergo H→D exchange at 393 K in D2 as detected by IR spectroscopy. HD is observed in temporal analysis of products (TAP) experiments when H2 and D2 are sequentially pulsed on silver at 673 K; even when the time delay between the isotopes is 4 s, HD is formed, indicating that long-lived surface hydrogen species are present. Differential scanning calorimetry (DSC) shows that the activation of dihydrogen is an activated process: heat signals evoked through H2 pulses on Ag/SiO2 grow with increasing temperature (373523 K). Nonetheless, the presence of silver on the silica surface accelerates the Si-OH→Si-OD exchange. Investigation of the exchange kinetics on Ag/SiO2 shows that diffusion processes of activated hydrogen species are rate-determining at higher temperatures ( 373 K), when activation of D2 on silver becomes facile. Indications of diffusion limitation are observed already at 313 K on Pt/SiO2. TAP and DSC measurements show that H2 is more readily activated on silver that has been treated in O2 at 673 K followed by reduction in H2 at 673 K. Morphological changes induced to the silver surfaces or (sub)surface oxygen species are presumed responsible for this effect

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SURFACE HYDROXYL GROUPS ON γ-ALUMINA¹

Cited by 492 publications

References 0 publications

Mechanism of Heterogeneous Reaction of Carbonyl Sulfide on Magnesium Oxide

Mechanism of Heterogeneous Reaction of Carbonyl Sulfide on Magnesium Oxide

Effect of Sample Preparation Route on the Thermal Diffusivity of Nd2O3 - A Laser Induced Photoacoustic Study

Activation of dihydrogen on supported and unsupported silver catalysts

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SURFACE HYDROXYL GROUPS ON γ-ALUMINA1

Cited by 492 publications

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Mechanism of Heterogeneous Reaction of Carbonyl Sulfide on Magnesium Oxide

Mechanism of Heterogeneous Reaction of Carbonyl Sulfide on Magnesium Oxide

Effect of Sample Preparation Route on the Thermal Diffusivity of Nd2O3 - A Laser Induced Photoacoustic Study

Activation of dihydrogen on supported and unsupported silver catalysts

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SURFACE HYDROXYL GROUPS ON γ-ALUMINA¹