Intermediate species on zirconia supported methanol aerogel catalysts

Bianchi, Daniel; Chafik, Tarik; Khalfallah, Mohamed; Teichner, S. J.

doi:10.1016/0926-860x(93)80250-t

Cited by 99 publications

(90 citation statements)

References 42 publications

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“…Köck et al pretreated the zirconia in air at 900 • C to completely dehydroxylate the sample, and only very weak OH bands remained 62 . Evacuation at 500 • C is reported to be insufficient for complete dehydroxylation 20 , but already at 550 • C spectra with no trace of surface hydroxyls after evacuation are shown 53 . The conditions necessary for total OH removal are at ca.…”

Section: Manipulation Of Hydroxyl Speciesmentioning

confidence: 99%

“…Commonly used methods for dehydration are vacuuming 20,24,33,70 or flushing 67 at elevated temperatures. Undissociated water adsorbed at room temperature is completely removed in vacuum by 127 • C 27 and after evacuation at 200 • C only two distinct OH bands at ca.…”

Section: Manipulation Of Hydroxyl Speciesmentioning

confidence: 99%

“…Most of the studies on the interaction with CO have been carried out using infrared spectroscopy 5,18,19,[22][23][24] . However, studies using other techniques, such as temperature-programmed methods 20,21,28,30 , calorimetry 27,31,32 , and gravimetry 33,34 , as well as theoretical studies 22,28 have been published.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon monoxide interacts with monoclinic zirconia both on the clean surface with few or no hydroxyls 18 , as well as on the hydroxylated surface 19,20 . The surface hydroxyl groups seem to play an important role in the interaction of CO with zirconia: as a site for forming formates 5,7,[20][21][22][23] and bicarbonates 22,[24][25][26] but also inhibiting the formation of adsorbed linear CO species 27 .…”

Section: Introductionmentioning

confidence: 99%

“…The surface hydroxyl groups seem to play an important role in the interaction of CO with zirconia: as a site for forming formates 5,7,[20][21][22][23] and bicarbonates 22,[24][25][26] but also inhibiting the formation of adsorbed linear CO species 27 . The main adsorbed CO species are linearly adsorbed CO at room temperature and below and formate species above 100 • C, the first one desorbing reversibly 27 and the second one decomposing both reversibly back to gas-phase CO and irreversibly to CO 2 and H 2 20,21,28 .…”

Section: Introductionmentioning

confidence: 99%

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Review: monoclinic zirconia, its surface sites and their interaction with carbon monoxide

Kouva

Honkala

Lefferts

et al. 2015

Catal. Sci. Technol.

150

138

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Section: Manipulation Of Hydroxyl Speciesmentioning

confidence: 99%

Section: Manipulation Of Hydroxyl Speciesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Review: monoclinic zirconia, its surface sites and their interaction with carbon monoxide

Kouva

Honkala

Lefferts

et al. 2015

Catal. Sci. Technol.

150

138

View full text Add to dashboard Cite

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Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Wang

et al. 2010

Chemistry A European J

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Solid‐state 13C magic angle spinning (MAS) NMR spectroscopy investigations identified zinc methyl species, formate species, and methoxy species as C1 surface species formed in methane activation on the zeolite Zn/H‐ZSM‐5 catalyst at T≤573 K. These C1 surface species, which are possible intermediates in further transformations of methane, were prepared separately by adsorption of 13C‐enriched methane, carbon monoxide, and methanol onto zinc‐containing catalysts, respectively. Successful isolation of each surface species allowed convenient investigations into their chemical nature on the working catalyst by solid‐state 13C MAS NMR spectroscopy. The reactivity of zinc methyl species with diverse probe molecules (i.e., water, methanol, hydrochloride, oxygen, or carbon dioxide) is correlated with that of organozinc compounds in organometallic chemistry. Moreover, surface formate and surface methoxy species possess distinct reactivity towards water, hydrochloride, ammonia, or hydrogen as probe molecules. To explain these and other observations, we propose that the C1 surface species interconvert on zeolite Zn/H‐ZSM‐5. As implied by the reactivity information, potential applications of methane co‐conversion on zinc‐containing zeolites might, therefore, be possible by further transformation of these C1 surface species with rationally designed co‐reactants (i.e., probe molecules) under optimized reaction conditions.

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Investigation of Methane Oxidation Reactions Over a Dual‐Bed Catalyst System using ¹⁸O Labelled DRIFTS coupling

et al. 2016

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Low loading Pd-supported (0.2 wt % Pd) Y-stabilized zirconia (YSZ) and LaMnO (LM) perovskite were associated to study the partial oxidation of methane using labelled O in the gas phase. Synthesis gas production was demonstrated to occur through an indirect reaction in which oxygen is first consumed in the total methane combustion. A Mars-van Krevelen mechanism was observed over Pd/YSZ at 425 °C to yield C O and C O. A significant enhancement of the Pd/YSZ catalyst activity was achieved by the association of LM-Pd/YSZ in a dual catalyst bed, resulting in a significant increase of the oxidation rate. Vibration bands of adsorbed formate species, assumed to be intermediates to the gas production, were observed by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) coupling experiments. It was proposed that LM enables the generation of highly active singlet O , which is activated on the YSZ oxygen vacancies to assist a rapid recovery of surface PdO and increase formate decomposition into CO and H in Pd-supported catalyst.

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Intermediate species on zirconia supported methanol aerogel catalysts

Cited by 99 publications

References 42 publications

Review: monoclinic zirconia, its surface sites and their interaction with carbon monoxide

Review: monoclinic zirconia, its surface sites and their interaction with carbon monoxide

Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Investigation of Methane Oxidation Reactions Over a Dual‐Bed Catalyst System using ¹⁸O Labelled DRIFTS coupling

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Intermediate species on zirconia supported methanol aerogel catalysts

Cited by 99 publications

References 42 publications

Review: monoclinic zirconia, its surface sites and their interaction with carbon monoxide

Review: monoclinic zirconia, its surface sites and their interaction with carbon monoxide

Reactivity of C1 Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Investigation of Methane Oxidation Reactions Over a Dual‐Bed Catalyst System using 18O Labelled DRIFTS coupling

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Reactivity of C₁ Surface Species Formed in Methane Activation on Zn‐Modified H‐ZSM‐5 Zeolite

Investigation of Methane Oxidation Reactions Over a Dual‐Bed Catalyst System using ¹⁸O Labelled DRIFTS coupling