The effects of zirconia morphology on methanol synthesis from CO and H2 over Cu/ZrO2 catalystsPart II. Transient-response infrared studies

Rhodes, Michael D.; Pokrovski, Konstantin A.; Bell, Alexis T.

doi:10.1016/j.jcat.2005.04.027

Cited by 109 publications

(70 citation statements)

References 35 publications

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“…This is consistent with removal of formate and methoxide groups adsorbed at these sites during reaction through hydrogenation to methanol [5]. In their studies of methanol synthesis over Cu/t-ZrO 2 and Cu/m-ZrO 2 Bell and coworkers [13] established that the rate limiting step is reductive elimination of Zr-OCH 3 species. As a result, the observed rate of methanol synthesis is proportional to the product of the apparent first order rate coefficient for methoxide reductive elimination, under steady-state reaction conditions.…”

Section: Infrared Spectroscopy Studiessupporting

confidence: 67%

“…Bell and co-workers [12,13] has demonstrated that the phase of zirconia can also influence catalyst activity. Thus, Cu/m-ZrO 2 (m-ZrO 2 -monoclinic zirconia) was shown to be nearly an order of magnitude more active for methanol synthesis than Cu/t-ZrO 2 (t-ZrO 2 -tetragonal zirconia) for equivalent zirconia surface areas and surface concentrations of dispersed Cu.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of cerium incorporation into zirconia on the activity of Cu/ZrO for methanol synthesis via CO hydrogenation

Pokrovski

Rhodes

Bell

2005

Journal of Catalysis

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Section: Infrared Spectroscopy Studiessupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Effects of cerium incorporation into zirconia on the activity of Cu/ZrO for methanol synthesis via CO hydrogenation

Pokrovski

Rhodes

Bell

2005

Journal of Catalysis

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“…Benzylation of benzene (1) with benzyl chloride (2) as an alkylating agent produces mainly diphenylmethane (3). As the Friedel-Crafts reaction is always accompanied by di-and poly-alkylations, due to higher reactivity of the product than the reactant, the benzylation reaction could also give dibenzylation products (4-6) as side products.…”

Section: Resultsmentioning

confidence: 99%

“…It is also mechanically and thermally stable; as a result, ZrO 2 has been used as a structural promoter and, more frequently, as a support material in many catalytic applications. CuO-ZrO 2 materials were used as catalysts for many reactions such as methanol decomposition [2], oxidative steam reforming of methanol, NO, N 2 O decomposition, CO and CO 2 hydrogenation [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

et al. 2016

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Mesoporous CuO-ZrO 2 catalysts were prepared and calcined at 500˝C. The performance of the synthesized catalysts for benzylation of benzene using benzyl chloride was studied. The bare support (macroporous ZrO 2 ) offered 45% benzyl chloride conversion after reaction time of 10 h at 75˝C. Significant increase in benzyl chloride conversion (98%) was observed after CuO loading (10 wt. %) on porous ZrO 2 support. The conversion was decreased to 80% with increase of CuO loading to 20 wt. %. Different characterization techniques (XRD, Raman, diffuse reflectance UV-vis, N 2 -physisorption, H 2 -TPR, XPS and acidity measurements) were used to evaluate physico-chemical properties of CuO-ZrO 2 catalysts; the results showed that the surface and structural characteristics of the ZrO 2 phase as well as the interaction between CuO-ZrO 2 species depend strongly on the CuO content. The results also indicated that ZrO 2 support was comprised of monoclinic and tetragonal phases with macropores. An increase of the volume of monoclinic ZrO 2 phase was observed after impregnation of 10 wt. % of CuO; however, stabilization of tetragonal ZrO 2 phase was noticed after loading of 20 wt. % CuO. The presence of low-angle XRD peaks indicates that mesoscopic order is preserved in the calcined CuO-ZrO 2 catalysts. XRD reflections due to CuO phase were not observed in case of 10 wt. % CuO supported ZrO 2 sample; in contrast, the presence of crystalline CuO phase was observed in 20 wt. % CuO supported ZrO 2 sample. The mesoporous 10 wt. % CuO supported ZrO 2 catalyst showed stable catalytic activity for several reaction cycles. The observed high catalytic activity of this catalyst could be attributed to the presence of a higher number of dispersed interactive CuO (Cu 2+ -O-Zr 4+ ) species, easy reducibility, and greater degree of accessible surface Lewis acid sites.

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“…By plotting the yield of acetophenone versus the tetragonal phase percentage (Figure 9), one can observe that the catalytic activity increases with increasing content of tetragonal ZrO 2 , thus confirming the primary role of this polymorph. Several authors have studied the influence of the zirconia polymorphs in supported Cu, [63][64][65] Au, 66 Ag, 67 Rh, 68 and Mo…”

Section: Hydration Of Alkynesmentioning

confidence: 99%

One step microwave-assisted synthesis of nanocrystalline WO_x–ZrO₂ acid catalysts

Gonell

Portehault

Julián‐López

et al. 2016

Catal. Sci. Technol.

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Nanocrystalline ZrO2 and WOx-ZrO2 catalysts with a good control over the zirconia phase and the nature of the W species were synthesized in a microwave-assisted aqueous route. The zirconia polymorphs monoclinic ZrO2 (m-ZrO2) and tetragonal ZrO2 (t-ZrO2) were isolated through an accurate control of the synthetic conditions, in acidic and basic media, respectively.The evolution of the zirconia and W species under annealing of the WOx-ZrO2 nanocomposites at 500 o C and 800 o C was studied, and the resulting materials were tested as catalysts for the reactions of aldoxime dehydration and hydration of alkynes for the production of nitriles and carbonyls, respectively. In the dehydration reaction the most active species are W(VI) in tetrahedral coordination, independently of the ZrO2 polymorph, while in the hydration reaction the zirconia phase plays a key role, as the tungsten doped t-ZrO2 appears the most active catalyst.

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The effects of zirconia morphology on methanol synthesis from CO and H2 over Cu/ZrO2 catalystsPart II. Transient-response infrared studies

Cited by 109 publications

References 35 publications

Effects of cerium incorporation into zirconia on the activity of Cu/ZrO for methanol synthesis via CO hydrogenation

Effects of cerium incorporation into zirconia on the activity of Cu/ZrO for methanol synthesis via CO hydrogenation

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

One step microwave-assisted synthesis of nanocrystalline WO_x–ZrO₂ acid catalysts

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The effects of zirconia morphology on methanol synthesis from CO and H2 over Cu/ZrO2 catalystsPart II. Transient-response infrared studies

Cited by 109 publications

References 35 publications

Effects of cerium incorporation into zirconia on the activity of Cu/ZrO for methanol synthesis via CO hydrogenation

Effects of cerium incorporation into zirconia on the activity of Cu/ZrO for methanol synthesis via CO hydrogenation

Physico-Chemical and Catalytic Properties of Mesoporous CuO-ZrO2 Catalysts

One step microwave-assisted synthesis of nanocrystalline WOx–ZrO2 acid catalysts

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Product

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One step microwave-assisted synthesis of nanocrystalline WO_x–ZrO₂ acid catalysts