Single and bimetallic catalyst screenings of noble metals for methane combustion

Kumsung, Weerit; Chareonpanich, Metta; Kongkachuichay, Paisan; Şenkan, Selim; Seubsai, Anusorn

doi:10.1016/j.catcom.2018.03.022

Cited by 24 publications

(18 citation statements)

References 26 publications

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“…Estimated price (USD/g) and % CH 4 conversion (value at the end of each bar) of single-metal and bimetallic catalysts. Reaction conditions: feed gas O 2 /CH 4 volume ratio = 3/5, gas hourly space velocity (GHSV) = 15,000 h −1 , and reactor temperature = 475 • C. Note that the value of CH 4 conversion of each catalyst was previously reported by Kumsung et al [24].…”

Section: Activity and Cost Of Single-metal And Bimetallic Catalystsmentioning

confidence: 94%

“…In a previous report [24], 20 elements were selected for single-metal catalyst screening, and it was found that the six most active single catalysts were 5Rh > 5Ru > 5Pd > 5Pt > 5Cu > 5Cr, where the number indicates the weight percentage on the alumina support. The CH 4 conversions were in the range 4.64-9.34% and the testing conditions used were 475 • C, an O 2 /CH 4 ratio of 3:5, and a total feed gas flow rate of 50 mL/min.…”

Section: Activity and Cost Of Single-metal And Bimetallic Catalystsmentioning

confidence: 99%

“…All the single and bimetallic catalysts were prepared using wet impregnation as previously reported [24]. For example, 2 wt% Cr + 3 wt% Ru loaded onto the γ-Al 2 O 3 support (denoted as the 2Cr3Ru/Al 2 O 3 catalyst) was prepared as follows.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…In previous work, we adopted a combinatorial approach to explore new active bimetallic catalysts. We found several bimetallic catalysts that delivered a CH 4 conversion higher than that of the benchmark Pt catalyst [24]. These catalysts were discovered using a screening method in which 20 single noble metals supported on γ-Al 2 O 3 were first screened to identify the six most-active metals at 475 • C and atmospheric pressure.…”

Section: Introductionmentioning

confidence: 99%

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Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

et al. 2019

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Catalyst screening of γ-Al2O3-supported, single-metal and bimetallic catalysts revealed several bimetallic catalysts with activities for partial combustion of methane greater than a benchmark Pt/γ-Al2O3 catalyst. A cost analysis of those catalysts identified that the (2 wt%Cr + 3 wt% Ru)/γ-Al2O3 catalyst, denoted as 2Cr3Ru/Al2O3, was about 17.6 times cheaper than the benchmark catalyst and achieved a methane conversion of 10.50% or 1.6 times higher than the benchmark catalyst based on identical catalyst weights. In addition, various catalyst characterization techniques were performed to determine the physicochemical properties of the catalysts, revealing that the particle size of RuO2 became smaller and the binding energy of Ru 3d also shifted toward a lower energy. Moreover, the operating conditions (reactor temperature and O2/CH4 ratio), stability, and reusability of the 2Cr3Ru/Al2O3 catalyst were investigated. The stability test of the catalyst over 24 h was very good, without any signs of coke deposition. The reusability of the catalyst for five cycles (6 h for each cycle) was noticeably excellent.

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Section: Activity and Cost Of Single-metal And Bimetallic Catalystsmentioning

confidence: 94%

Section: Activity and Cost Of Single-metal And Bimetallic Catalystsmentioning

confidence: 99%

Section: Catalyst Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

et al. 2019

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“…[19] Metallic iridium (supported on alumina) has briefly explored as a part of catalyst screening of noble metals for methane combustion at 475°C, revealing, however, iridium to be inferior to the remaining platinum group members. [20] While IrO 2 is efficient for methane activation, [16] its total oxidation capability is quite poor as demonstrated by a recent study on the CO oxidation over Ru x Ir 1À x O 2 powder catalysts with the composition x ranging from 0 to 100 mol %. [21] Quite in contrast, RuO 2 is well-documented to be an efficient oxidation catalyst.…”

Section: Introductionmentioning

confidence: 99%

Mixed Ru_xIr_1−xO₂ Supported on Rutile TiO₂: Catalytic Methane Combustion, a Model Study

et al. 2021

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With a modified Pechini synthesis, mixed Ru x Ir 1À x O 2 is grown on rutile-TiO 2 with full control of the composition x, where the preformed TiO 2 particles serve as nucleation sites for the active component. Catalytic and kinetic data of the methane combustion over Ru x Ir 1À x O 2 @TiO 2 and unsupported Ru x Ir 1À x O 2 catalysts reveal that the least active catalyst is RuO 2 @TiO 2 (onset temperature: 270°C), while the most active catalyst is Ru 0.25 Ir 0.75 O 2 with an onset temperature below 220°C. Surprisingly, even Ru 0.75 Ir 0.25 O 2 @TiO 2 is remarkably active in methane combustion (onset temperature: 230°C), indicating that little iridium in the mixed Ru x Ir 1À x O 2 oxide component already improves the activity of the methane combustion considerably. We conclude that iridium in the mixed Ru x Ir 1À x O 2 oxide enables efficient methane activation, while ruthenium promotes the subsequent oxidation steps of the methyl group to produce CO 2 . Kinetic data provide a reaction order in O 2 of zero, while that of methane is close to one, indicating that the methane activation is rate limiting. The apparent activation energy varies among Ru x Ir 1À x O 2 from 110 (x = 0) to 80 kJ • mol À 1 (x = 1). This variation in the apparent activation energy may be explained by the variation in adsorption energy of oxygen. Under the given reaction conditions the catalyst's surface is saturated with adsorbed oxygen and only if oxygen desorbs, methane can be activated and the methyl group can be accommodated at the liberated surface metal sites.

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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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Single and bimetallic catalyst screenings of noble metals for methane combustion

Cited by 24 publications

References 26 publications

Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

Mixed Ru_xIr_1−xO₂ Supported on Rutile TiO₂: Catalytic Methane Combustion, a Model Study

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

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Single and bimetallic catalyst screenings of noble metals for methane combustion

Cited by 24 publications

References 26 publications

Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

Chromium-Ruthenium Oxides Supported on Gamma-Alumina as an Alternative Catalyst for Partial Combustion of Methane

Mixed RuxIr1−xO2 Supported on Rutile TiO2: Catalytic Methane Combustion, a Model Study

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

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Mixed Ru_xIr_1−xO₂ Supported on Rutile TiO₂: Catalytic Methane Combustion, a Model Study