Insights into the improvement effect of Fe doping into the CeO2 catalyst for vapor phase ketonization of carboxylic acids

Lu, Feipeng; Jiang, Binbo; Wang, Jingdai; Huang, Zhengliang; Yang, Yongrong

doi:10.1016/j.mcat.2017.05.022

Cited by 27 publications

(21 citation statements)

References 54 publications

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“…Similarly, the same authors have also shown the promoting effect of Fe when preparing Ce1-xFexOy (x=0.1-0.7) catalysts for the gas-phase coupling of acetic and propionic acid with analogue conclusions in a different publication. [107] To further link ketonization performance and the impact of metal oxide doping, Sudarsanam et al have performed the cycloketonization of dimethyl adipate to cyclopentanone on CexZr1-xO2, CexZr1-xO2/SiO2 and CexZr1-xO2/Al2O3 catalysts. [42] Here, dimethyl adipate conversion and cyclopentanone yield increased when incorporating Zr into CeO2 materials, with the highest activity for alumina supported materials.…”

Section: Catalyst Modificationmentioning

confidence: 99%

Catalytic advancements in carboxylic acid ketonization and its perspectives on biomass valorisation

Boekaerts

Sels

2021

Applied Catalysis B: Environmental

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Section: Catalyst Modificationmentioning

confidence: 99%

Catalytic advancements in carboxylic acid ketonization and its perspectives on biomass valorisation

Boekaerts

Sels

2021

Applied Catalysis B: Environmental

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“…However, the Fe 2 O 3 /CeO 2 binary system has not been extensively investigated in relation to the support shape dependence of catalytic activity, which is a highly engaging topic. To fully address this, most of the studies concern the effect of iron content [39,41], calcination temperature [42], or the distribution of iron ions in solid solutions [43] of Fe-doped CeO 2 catalysts. Moreover, others have focused on the improvement of OSC and oxygen mobility of iron-doped ceria catalysts [44].…”

Section: Of 21mentioning

confidence: 99%

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

et al. 2019

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Ceria has been widely studied either as catalyst itself or support of various active phases in many catalytic reactions, due to its unique redox and surface properties in conjunction to its lower cost, compared to noble metal-based catalytic systems. The rational design of catalytic materials, through appropriate tailoring of the particles’ shape and size, in order to acquire highly efficient nanocatalysts, is of major significance. Iron is considered to be one of the cheapest transition metals while its interaction with ceria support and their shape-dependent catalytic activity has not been fully investigated. In this work, we report on ceria nanostructures morphological effects (cubes, polyhedra, rods) on the textural, structural, surface, redox properties and, consequently, on the CO oxidation performance of the iron-ceria mixed oxides (Fe2O3/CeO2). A full characterization study involving N2 adsorption at –196 °C, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) was performed. The results clearly revealed the key role of support morphology on the physicochemical properties and the catalytic behavior of the iron-ceria binary system, with the rod-shaped sample exhibiting the highest catalytic performance, both in terms of conversion and specific activity, due to its improved reducibility and oxygen mobility, along with its abundance in Fe2+ species.

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“…The ketonization reaction can be performed on two types of catalysts, metal oxide [9][10][11][12][13][14] and zeolite [15,16], in the vapor phase and aqueous phase. The amphoteric metal oxides show higher catalytic activity, such as MnO 2 , TiO 2 , ZrO 2 , CeO 2 , etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zirconia Polymorph on Vapor-Phase Ketonization of Propionic Acid

Ding

Zhao

2019

Catalysts

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Vapor-phase ketonization of propionic acid derived from biomass was studied at 300-375 • C over ZrO 2 with different zirconia polymorph. The tetragonal ZrO 2 (t-ZrO 2 ) are more active than monoclinic ZrO 2 (m-ZrO 2 ). The results of characterizations from X-ray diffraction (XRD) and Raman suggest m-ZrO 2 and t-ZrO 2 are synthesized by the solvothermal method. NH 3 and CO 2 temperature-programmed desorption (NH 3 -TPD and CO 2 -TPD) measurements show that there were more medium-strength Lewis acid base sites with lower coordination exposed on m-ZrO 2 relative to t-ZrO 2 , increasing the adsorption strength of propionic acid. The in situ DRIFTS (Diffuse reflectance infrared Fourier transform spectroscopy) of adsorbed propionic acid under ketonization reaction reveal that as the most abundant surface intermediates, the monodentate propionates are more active than bidentate propionates. In comparison with m-ZrO 2 , the t-ZrO 2 surface favors monodentate adsorption over bidentate adsorption. Additionally, the adsorption strength of monodentate propionate is weaker on t-ZrO 2 . These differences in adsorption configuration and adsorption strength of propionic acid are affected by the zirconia structure. The higher surface concentration and weaker adsorption strength of monodentate propionates contribute to the higher ketonization rate in the steady state.Catalysts 2019, 9, 768 2 of 15 coordination of Ti 4+ cations exposed on the surface. Stubenrauch et al. studied the reaction of formic acid and acetic acid on CeO 2 (111) and (100) surface [24]. On both surfaces, CH 2 CO was produced through acetic acid dehydration near 600 K. However, acetone was detected only on the (111) surface during acetic acid decomposition at 600 K. This result is different from that obtained by Kim et al., since Ce 4+ cations of (111) surface possess one vacancy relative to the Ce 4+ cations in the bulk. Wang et al. carried out ketonization of carboxylic acid on anatase and rutile TiO 2 , monoclinic and tetragonal ZrO 2 at 503-533 K [25,26]. They showed that the reaction activity of acetic acid was higher over anatase TiO 2 than that over rutile TiO 2 , and attributed that to the more reactive monodentate acetate present on anatase TiO 2 , whereas unreactive bidentate acetate was present on rutile TiO 2 . The effect of different nanocrystals (nanocubes, nanorods and nanopolyhedra) of CeO 2 on acetic acid ketonization was studied by Snell et al. at 503 K in the condensed phase and at 623 K in the vapor phase [27]. They found that the crystal of CeO 2 was disrupted in the condensed phase with the formation of metal carboxylate, whereas the bulk structure was maintained during the vapor phase reaction. They suggested that the morphology of CeO 2 did not have a critical influence on the reaction activity in the condensed and vapor phase. Although some work has been done on the influence of the structure, no consensus has been reached. This may be due to the different reaction conditions (condensed phase and vapor phase) via the different reaction...

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Insights into the improvement effect of Fe doping into the CeO2 catalyst for vapor phase ketonization of carboxylic acids

Cited by 27 publications

References 54 publications

Catalytic advancements in carboxylic acid ketonization and its perspectives on biomass valorisation

Catalytic advancements in carboxylic acid ketonization and its perspectives on biomass valorisation

Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation

Effect of Zirconia Polymorph on Vapor-Phase Ketonization of Propionic Acid

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