Product Selectivity as a Function of ZrO2 Phase in Cu/ZrO2 Catalysts in the Conversion of Cyclohexanol

Peddinti, Nagaiah; Pramod, Chodimella Venkata; Rao, Madduluri Venkata; Raju, B. David; Rao, K. Srinivasa

doi:10.1007/s10562-018-2473-6

Cited by 14 publications

(9 citation statements)

References 47 publications

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“…In conclusion, zirconia phase composition clearly has a dramatic effect on the catalytic behavior of the final material; however, actually, the effect cannot be rationalized or clearly explained. Despite Tetragonal ZrO 2 is the most frequently used, and it is often considered as the best choice in terms of acid properties and oxygen vacancies compared to the monoclinic ZrO 2 , but the results are not univocal [1,2,[9][10][11][12][13][14]. On the other hand, amorphous zirconia, in spite of a non-crystalline nature, has a higher surface area, thus leading in several cases to a catalyst showing superior performances, as shown especially in some recent works [2,4,5,15,16].…”

Section: Preparation and Properties Of Copper-zirconia Catalystsmentioning

confidence: 99%

Copper–Zirconia Catalysts: Powerful Multifunctional Catalytic Tools to Approach Sustainable Processes

Scotti¹,

Bossola²,

Zaccheria³

et al. 2020

Catalysts

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Copper–zirconia catalysts find many applications in different reactions owing to their unique surface properties and relatively easy manufacture. The so-called methanol economy, which includes the CO2 and CO valorization and the hydrogen production, and the emerging (bio)alcohol upgrading via dehydrogenative coupling reaction, are two critical fields for a truly sustainable development in which copper–zirconia has a relevant role. In this review, we provide a systematic view on the factors most impacting the catalytic activity and try to clarify some of the discrepancies that can be found in the literature. We will show that contrarily to the large number of studies focusing on the zirconia crystallographic phase, in the last years, it has turned out that the degree of surface hydroxylation and the copper–zirconia interphase are in fact the two mostly determining factors to be controlled to achieve high catalytic performances.

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Section: Preparation and Properties Of Copper-zirconia Catalystsmentioning

confidence: 99%

Copper–Zirconia Catalysts: Powerful Multifunctional Catalytic Tools to Approach Sustainable Processes

Scotti¹,

Bossola²,

Zaccheria³

et al. 2020

Catalysts

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“…Several reports are available on various copperbased catalysts like Cu/Al 2 O 3 , 28 Cu/MgO, 29 Cu/ZrO 2 (ref. 31) and Cu/SBA-15. 30 Nevertheless, there is a signicant ambiguity that exists about the CHol dehydrogenation mechanism regarding the active phase of Cu.…”

Section: Dehydrogenation Of Cyclohexanol (Chol)mentioning

confidence: 99%

“…For instance, Cu/ZrO 2 catalyst afforded benzene and cyclohexanone as possible products, which are major, depends on the active phase of supported zirconium oxide material. 31 Initially, a blank test was typically conducted without the active catalyst using quartz pieces as an inert medium in the reactor, and no specic products were accurately detected. Therefore, a homogeneous surface/volume effect was ruled out.…”

Section: Dehydrogenation Of Cyclohexanol (Chol)mentioning

confidence: 99%

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Hydrogen-free hydrogenation of nitrobenzene via direct coupling with cyclohexanol dehydrogenation over ordered mesoporous MgO/SBA-15 supported Cu nanoparticles

et al. 2020

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“…In one study, over Cu/ZrO 2 catalysts, presented a high yield of Cyhon 57% and benzene 79%. The products formation and distribution depends on the ZrO 2 phase in Cu/ZrO 2 catalysts, which are synthesized by impregnation and co-precipitation methods [24]. Recently reported a AuMgCu/Cr 2 O 4 catalyst shown a high yield of Cyhon 69.5% and 86.4% at 533 and 573 K, respectively [25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of high surface area zinc oxide supported copper catalysts and its catalytic activity studies on dehydrogenation of cyclohexanol

Koppadi

Nekkala

Bhanuchander

et al. 2022

Preprint

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Rice-derived high surface area ZnO support (HSA-ZnO) is prepared by a novel thermal decomposition technique using rice grains as a sacrificial exo-template and zinc acetate trihydrate as an ZnO precursor. Further, copper supported HSA-ZnO catalysts with different copper loadings (4, 8, 12 and 16 wt.%) were prepared by using wet impregnation method and characterized by various physicochemical techniques such as X-ray diffraction (XRD), thermo gravimetric analysis (TGA), BET surface area, temperature programmed techniques for CO2 desorption (CO2-TPD) and reduction (H2-TPR) and N2O pulse chemisorption measurements. The as-prepared ZnO support material exhibited moderately high surface area of 145 m2/g, which is six times higher than commercial ZnO. The screening of Cu-modified HSA-ZnO catalysts were evaluated in the dehydrogenation of cyclohexanol to cyclohexanone reaction in a continuous flow reactor. In this work, the effect of temperature, the influence of copper loadings and the catalyst stability were thoroughly investigated. The catalyst exhibited varied properties with Cu loading and among the studied catalysts, 12 wt.% Cu/HSA-ZnO catalyst exhibited highest cyclohexanol conversion of 75% and 89% cyclohexanone selectivity was achieved. The results were substantiated and confirmed by N2O pulse chemisorption and temperature programmed studies.

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Product Selectivity as a Function of ZrO2 Phase in Cu/ZrO2 Catalysts in the Conversion of Cyclohexanol

Cited by 14 publications

References 47 publications

Copper–Zirconia Catalysts: Powerful Multifunctional Catalytic Tools to Approach Sustainable Processes

Copper–Zirconia Catalysts: Powerful Multifunctional Catalytic Tools to Approach Sustainable Processes

Hydrogen-free hydrogenation of nitrobenzene via direct coupling with cyclohexanol dehydrogenation over ordered mesoporous MgO/SBA-15 supported Cu nanoparticles

Synthesis of high surface area zinc oxide supported copper catalysts and its catalytic activity studies on dehydrogenation of cyclohexanol

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