Correlation between the physicochemical properties and catalytic performances of micro/mesoporous CoCeO  mixed oxides for propane combustion

Li, Xiang; Li, Xinghua; Zeng, Xiaolan

doi:10.1016/j.apcata.2018.12.026

Cited by 72 publications

(37 citation statements)

References 61 publications

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“…Lattice oxygen could be much more easily abstracted by hydrogen from Cu 0.05 Co and Ni 0.05 Co than from Co 3 O 4 , increasing the mobility of lattice oxygen and resulting in better oxidation ability. For propane oxidation, the amount of surface adsorbed oxygen is reported to be the determining factor [30,31]. Thus, metal doping may influence the chemical status of surface/chemisorbed oxygen in M 0.05 Co, thus leading to a different catalytic behavior in propane oxidation.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Different Metal Doping Effects on Co3O4 Catalysts for the Total Oxidation of Toluene and Propane

et al. 2020

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Metal-doped (Mn, Cu, Ni, and Fe) cobalt oxides were prepared by a coprecipitation method and were used as catalysts for the total oxidation of toluene and propane. The metal-doped catalysts displayed the same cubic spinel Co3O4 structure as the pure cobalt oxide did; the variation of cell parameter demonstrated the incorporation of dopants into the cobalt oxide lattice. FTIR spectra revealed the segregation of manganese oxide and iron oxide. The addition of dopant greatly influenced the crystallite size, strain, specific surface area, reducibility, and subsequently the catalytic performance of cobalt oxides. The catalytic activity of new materials was closely related to the nature of the dopant and the type of hydrocarbons. The doping of Mn, Ni, and Cu favored the combustion of toluene, with the Mn-doped one being the most active (14.6 × 10−8 mol gCo−1 s−1 at 210 °C; T50 = 224 °C), while the presence of Fe in Co3O4 inhibited its toluene activity. Regarding the combustion of propane, the introduction of Cu, Ni, and Fe had a negative effect on propane oxidation, while the presence of Mn in Co3O4 maintained its propane activity (6.1 × 10−8 mol gCo−1 s−1 at 160 °C; T50 = 201 °C). The excellent performance of Mn-doped Co3O4 could be attributed to the small grain size, high degree of strain, high surface area, and strong interaction between Mn and Co. Moreover, the presence of 4.4 vol.% H2O badly suppressed the activity of metal-doped catalysts for propane oxidation, among them, Fe-doped Co3O4 showed the best durability for wet propane combustion.

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Section: Discussionmentioning

confidence: 99%

Comparison of Different Metal Doping Effects on Co3O4 Catalysts for the Total Oxidation of Toluene and Propane

et al. 2020

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“…When this catalyst is employed, it is possible to reduce T50 by 150 • C, with respect to the uncatalyzed reaction (600 • C). A series of materials with greater activity than those studied here for propane combustion, are presented in the bibliography [25,27,30,31,75]. Different reports present catalytic systems where the T50 values are lower than 300 • C, even when using high-space velocities.…”

Section: Ag1z Ag5z Ag10zmentioning

confidence: 98%

“…Different reports present catalytic systems where the T50 values are lower than 300 • C, even when using high-space velocities. For example, in a recent paper by X. Li et al [30], the activities of the CoCeO x catalysts was reported and compared with other similar systems, which presented very low values of T50. The poor performance of the AgxZ catalysts can be attributed to the low capacity of the Ag species to promote the activation of propane.…”

Section: Ag1z Ag5z Ag10zmentioning

confidence: 99%

“…In the case of VOCs, and particularly in the case of the oxidation of the remaining hydrocarbons (HC), the following oxidic systems and compounds have been reported as being active: Co 3 O 4 , MnO 2 , CeO 2 , and CuO [21][22][23][24][25][26][27][28][29][30][31]. The combustion reaction of particulate matter has been extensively studied in recent decades, identifying catalysts with very diverse active phases [32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

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Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

et al. 2019

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This work presents the physicochemical characterization and activity of zirconia-supported silver catalysts for the oxidation of pollutants present in diesel engine exhaust (propane, propene, naphthalene and soot). A series of silver-supported catalysts AgxZ (x = 1, 5 and 10 wt.%, Z = zirconia) were prepared, which were studied by various characterization techniques. The results show that silver is mainly found under the form of small metal nanoparticles (<10 nm) dispersed over the support. The metallic phase coexists with the AgOx oxidic phases. Silver is introduced onto the zirconia, generating Ag–ZrO2 catalysts with high activity for the oxidation of propene and naphthalene. These catalysts also show some activity for soot combustion. Silver species can contribute with zirconia in the catalytic redox cycle, through a synergistic effect, providing sites that facilitate the migration and availability of oxygen, which is favored by the presence of structural defects. This is a novel application of the AgOx–Ag/ZrO2 system in the combustion reaction of propene and naphthalene. The results are highly promising, given that the T50 values found for both model molecules are quite low.

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“…It has been reported in the literature that one of the most accepted mechanisms in the catalytic oxidation of hydrocarbons is the Mars-van Krevelen (MVK) mechanism [42]. In this mechanism, it is postulated that the metallic oxide provides the active oxygen for the reaction and generates a redox cycle where Co(III) can be reduced to Co(II) [17].…”

Section: Catalyst Propane Combustion T50 (°C) T100 (°C)mentioning

confidence: 99%

Propane and Naphthalene Oxidation over Gold-Promoted Cobalt Catalysts Supported on Zirconia

et al. 2020

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Zirconia-supported gold-promoted cobalt catalysts were synthesized and tested for the complete oxidation of propane and naphthalene. The catalysts were characterized by BET surface area, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), powder X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). In both propane and naphthalene combustion reactions, the results obtained indicate that catalysts formulated with Co3O4 are more active than those containing only Au. Catalysts prepared using the deposit/precipitation (DP) method have better activity than those in which the traditional technique is used. Gold addition using the DP methods generates a promoting effect on the activity of cobalt-containing catalysts. The AuDpCoZt catalyst was found to be the most active for both propane and naphthalene combustion. The catalytic behavior of this sample is associated with a synergic effect between gold, cobalt, and the support, which is also evidenced by an increase in the reducibility of this catalytic system. The effect of the presence of NO in the feed was also analyzed for propane combustion.

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Correlation between the physicochemical properties and catalytic performances of micro/mesoporous CoCeO mixed oxides for propane combustion

Cited by 72 publications

References 61 publications

Comparison of Different Metal Doping Effects on Co3O4 Catalysts for the Total Oxidation of Toluene and Propane

Comparison of Different Metal Doping Effects on Co3O4 Catalysts for the Total Oxidation of Toluene and Propane

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

Propane and Naphthalene Oxidation over Gold-Promoted Cobalt Catalysts Supported on Zirconia

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