Reaction kinetics and mechanism of complete methane oxidation on Pd/Mn2O3 catalyst

Todorova, S.; Naydenov, A.; Kolev, Hristo; Ivanov, G.; Ganguly, Anirban; Mondal, Swastik; Saha, Soumen; Ganguli, Ashok K.

doi:10.1007/s11144-018-1343-y

Cited by 17 publications

(7 citation statements)

References 49 publications

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“…Thus, the catalyst efficiency follows this general trend: Pd/HAP > Rh/HAP > Pt/HAP > Ru/HAP. This is in good agreement with the literature data, in which palladium catalysts are generally regarded as the most promising candidates for complete methane oxidation [30][31][32][33]. For instance, a similar trend was reported by Oh et al [30] in their study on the activity of γ-Al 2 O 3 -supported catalysts under both oxidizing and reducing conditions (Pd > Rh > Pt).…”

Section: Catalytic Activitysupporting

confidence: 91%

“…As expected, the most active catalysts (Pd/HAP and Rh/HAP) show the lowest Ea values (76-77 kJ mol −1 ) compared with those estimated over Pt/HAP and Ru/HAP catalysts (105 and 95 kJ mol −1 , respectively) (Table 2). Note that our estimated values are comparable to those reported over noble metals supported on different materials [31][32][33][34][35]. Because there is no correlation between the performance and the metallic dispersion, it can be concluded that the dependence of methane oxidation on the metallic particle size, spread on the HAP support, is secondary.…”

Section: Catalytic Activitysupporting

confidence: 81%

“…As expected, the most active catalysts (Pd/HAP and Rh/HAP) show the lowest E a values (76-77 kJ mol −1 ) compared with those estimated over Pt/HAP and Ru/HAP catalysts (105 and 95 kJ mol −1 , respectively) (Table 2). Note that our estimated values are comparable to those reported over noble metals supported on different materials [31][32][33][34][35]. Given the promising performance of the Pd/HAP and Rh/HAP samples, additional experiments were carried out to study the effect of the addition of H2O and CO2 on their catalytic efficiency (Figure 8).…”

Section: Catalytic Activitysupporting

confidence: 76%

“…This high tendency to be re-oxidized probably generates more active metal oxides. Previous reports demonstrated that the activity of noble metals in methane oxidation proceed through the Mars-Van Krevelen mechanism, in which their ability to undergo redox processes under the reaction mixture is a determining factor [13,31,32]. Accordingly, the Ru/HAP and Pt/HAP catalysts showed a low activity, because a large fraction of the supported metal probably remains in reduced forms after being exposed to the reaction mixture, even in the presence of a high concentration of oxygen (20%).…”

Section: Catalytic Activitymentioning

confidence: 99%

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Comparative Study of the Efficiency of Different Noble Metals Supported on Hydroxyapatite in the Catalytic Lean Methane Oxidation under Realistic Conditions

et al. 2021

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The combustion of lean methane was studied over palladium, rhodium, platinum, and ruthenium catalysts supported on hydroxyapatite (HAP). The samples were prepared by wetness impregnation and thoroughly characterized by BET, XRD, UV-Vis-NIR spectroscopy, H2-TPR, OSC, CO chemisorption, and TEM techniques. It was found that the Pd/HAP and Rh/HAP catalysts exhibited a higher activity compared with Pt/HAP and Ru/HAP samples. Thus, the degree of oxidation of the supported metal under the reaction mixture notably influenced its catalytic performance. Although Pd and Rh catalysts could be easily re-oxidized, the re-oxidation of Pt and Ru samples appeared to be a slow process, resulting in small amounts of metal oxide active sites. Feeding water and CO2 was found to have a negative effect, which was more pronounced in the presence of water, on the activity of Pd and Rh catalysts. However, the inhibiting effect of CO2 and H2O decreased by increasing the reaction temperature.

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Section: Catalytic Activitysupporting

confidence: 91%

Section: Catalytic Activitysupporting

confidence: 81%

“…As expected, the most active catalysts (Pd/HAP and Rh/HAP) show the lowest E a values (76-77 kJ mol −1 ) compared with those estimated over Pt/HAP and Ru/HAP catalysts (105 and 95 kJ mol −1 , respectively) (Table 2). Note that our estimated values are comparable to those reported over noble metals supported on different materials [31][32][33][34][35]. Given the promising performance of the Pd/HAP and Rh/HAP samples, additional experiments were carried out to study the effect of the addition of H2O and CO2 on their catalytic efficiency (Figure 8).…”

Section: Catalytic Activitysupporting

confidence: 76%

Section: Catalytic Activitymentioning

confidence: 99%

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Comparative Study of the Efficiency of Different Noble Metals Supported on Hydroxyapatite in the Catalytic Lean Methane Oxidation under Realistic Conditions

et al. 2021

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“…The lattice oxygen is then replenished by the reduction of gaseous oxygen. Therefore, the availability and reactivity of surface oxygen species affect the activity of manganese oxides to a great extent, being the key parameter to develop high performance catalysts [34].…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of cavity-containing manganese oxides with superior catalytic performance in toluene oxidation

Garcı́a

López

Mayoral

et al. 2019

Applied Catalysis A: General

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Manganese oxide prepared by a simple hydrothermal method is highly active and stable in both lab and quasi industrial conditions for the total oxidation of toluene, achieving full conversion at only 150 º C in the presence of 4 wt.% water. Moreover, this performance is stable for several cycles. The enhanced catalytic performance has been related the presence of highly reactive oxygen surface species. This species are probably promoted by Mn3O4 nanoparticles with Mn 3+ at the tetragonal distorted cationic sites, likely compensated by structural water at the anionic sites. The presence of structural water can be related to the formation of internal cavities/vesicles in the Mn3O4 crystalline structure.

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Current Progress on Methods and Technologies for Catalytic Methane Activation at Low Temperatures

et al. 2022

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Methane (CH 4 ) is an attractive energy source and important greenhouse gas. Therefore, from the economic and environmental point of view, scientists are working hard to activate and convert CH 4 into various products or less harmful gas at low-temperature. Although the inert nature of C-H bonds requires high dissociation energy at high temperatures, the efforts of researchers have demonstrated the feasibility of catalysts to activate CH 4 at low temperatures. In this review, the efficient catalysts designed to reduce the CH 4 oxidation temperature and improve conversion efficiencies are described. First, noble metals and transition metal-based catalysts are summarized for activating CH 4 in temperatures ranging from 50 to 500 °C. After that, the partial oxidation of CH 4 at relatively low temperatures, including thermocatalysis in the liquid phase, photocatalysis, electrocatalysis, and nonthermal plasma technologies, is briefly discussed. Finally, the challenges and perspectives are presented to provide a systematic guideline for designing and synthesizing the highly efficient catalysts in the complete/partial oxidation of CH 4 at low temperatures.

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Reaction kinetics and mechanism of complete methane oxidation on Pd/Mn2O3 catalyst

Cited by 17 publications

References 49 publications

Comparative Study of the Efficiency of Different Noble Metals Supported on Hydroxyapatite in the Catalytic Lean Methane Oxidation under Realistic Conditions

Comparative Study of the Efficiency of Different Noble Metals Supported on Hydroxyapatite in the Catalytic Lean Methane Oxidation under Realistic Conditions

Green synthesis of cavity-containing manganese oxides with superior catalytic performance in toluene oxidation

Current Progress on Methods and Technologies for Catalytic Methane Activation at Low Temperatures

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