Stable complete methane oxidation over palladium based zeolite catalysts

Petrov, Andrey W.; Ferri, Davide; Krumeich, Frank; Nachtegaal, Maarten; Bokhoven, Jeroen A. van; Kröcher, Oliver

doi:10.1038/s41467-018-04748-x

Cited by 208 publications

(204 citation statements)

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“…Gosiewski and Pawlaczyk () estimate that 0.5 t of Pd would be needed to mitigate emissions from a single coal mine ventilation shaft. Unfortunately, currently, there has been little research on ultralean methane combustion using these catalysts (Jiang et al, ), though palladium‐based zeolite catalysis is possible (Petrov et al, ). More generally, the use of zeolite‐metal technologies to remove methane from air is promising (Jackson et al, ).…”

Section: Practical Emission Reduction and Removal—tractable Emissionsmentioning

confidence: 99%

Methane Mitigation: Methods to Reduce Emissions, on the Path to the Paris Agreement

Nisbet

Fisher

Lowry

et al. 2020

Reviews of Geophysics

214

131

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The atmospheric methane burden is increasing rapidly, contrary to pathways compatible with the goals of the 2015 United Nations Framework Convention on Climate Change Paris Agreement. Urgent action is required to bring methane back to a pathway more in line with the Paris goals. Emission reduction from “tractable” (easier to mitigate) anthropogenic sources such as the fossil fuel industries and landfills is being much facilitated by technical advances in the past decade, which have radically improved our ability to locate, identify, quantify, and reduce emissions. Measures to reduce emissions from “intractable” (harder to mitigate) anthropogenic sources such as agriculture and biomass burning have received less attention and are also becoming more feasible, including removal from elevated‐methane ambient air near to sources. The wider effort to use microbiological and dietary intervention to reduce emissions from cattle (and humans) is not addressed in detail in this essentially geophysical review. Though they cannot replace the need to reach “net‐zero” emissions of CO2, significant reductions in the methane burden will ease the timescales needed to reach required CO2 reduction targets for any particular future temperature limit. There is no single magic bullet, but implementation of a wide array of mitigation and emission reduction strategies could substantially cut the global methane burden, at a cost that is relatively low compared to the parallel and necessary measures to reduce CO2, and thereby reduce the atmospheric methane burden back toward pathways consistent with the goals of the Paris Agreement.

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Section: Practical Emission Reduction and Removal—tractable Emissionsmentioning

confidence: 99%

Methane Mitigation: Methods to Reduce Emissions, on the Path to the Paris Agreement

Nisbet

Fisher

Lowry

et al. 2020

Reviews of Geophysics

214

131

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“…Metal oxide–supported PdO catalysts are generally considered to represent the state of the art for methane combustion catalysts . Recent research in this field has focused on improving activity at low temperatures, reducing the required loading of metal and improving the thermal and hydrothermal stability of PdO catalysts . Exciting recent advances include the development of core–shell Pd@CeO 2 catalysts with high activity and thermal stability, demonstrating complete conversion to CO 2 below 400 °C (gas hourly space velocity (GHSV) = 200 000 mL g −1 h −1 ) .…”

Section: Introductionmentioning

confidence: 99%

Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion

Dai

Kumar

Zhu

et al. 2019

Adv Funct Materials

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Bowtie-shaped NiCo 2 O 4 nanostructures are prepared using a hydrothermal method. Variation of the synthesis parameters, including reaction time, additives, and calcination temperature, allows an understanding of the origin of the bowtie-shaped structure to be developed. Methane oxidation experiments performed using temperature-programed oxidation (TPO) show that the new materials, which do not contain precious metals, have excellent activity for low-temperature methane combustion, with 100% conversion at ≈410 °C (gas hourly space velocity (GHSV): 90 000 mL (STP) g −1 h −1 ). The structure-activity relationships of the bowtie-shaped nanostructures are explored. The relatively low exhaust temperature in NGVs means that the activation of methane, which has the strongest CH bond of any hydrocarbon, is challenging from a chemical perspective. It is not surprising that the quest for effective lowtemperature methane oxidation catalysts has focused mainly on systems involving precious metals, such as platinum and palladium. [11][12][13][14][15] Metal oxidesupported PdO catalysts are generally considered to represent the state of the art for methane combustion catalysts. [16][17][18][19][20] Recent research in this field has focused on improving activity at low temperatures, [21,22] reducing the required loading of metal [23,24] and improving the thermal and hydrothermal stability of PdO catalysts. [25][26][27][28][29][30] Exciting recent advances include the development of core-shell Pd@CeO 2 catalysts with high activity and thermal stability, demonstrating complete conversion to CO 2 below 400 °C (gas hourly space velocity (GHSV) = 200 000 mL g −1 h −1 ). [21] Pd@ZrO 2 /Si-Al 2 O 3 catalysts that are stable in the presence of high concentrations of water vapor have also been proposed recently. [25] NiO@PdO/Al 2 O 3 catalysts that show good activity and stability with only 0.2 wt% Pd loading have been prepared [23] as well as Pd-based bimetallic nanocrystalline catalysts, in which the promotional effects of different transition metals have been examined. [26] Although Pd-based catalysts show excellent activity, the high price and low abundance of palladium are limiting factors to practical application, [31] and both the hydrothermal stability and SO 2 tolerance for these catalysts need to be improved. For this reason, the development of alternative catalysts based on non-noble metals is attractive. [32] These include single metal oxide-based catalysts (CuO, [33] Co 3 O 4 , [34] and MnO 2 [35] ), perovskite, [36,37] spinel, [38,39] and hexaaluminate [40] catalysts. Among these, Co 3 O 4 exhibits good activity for methane combustion attributed to a spinel-type structure with variable Co oxidation states and a high density of oxygen vacancies on the surface. [41] Additionally, the specific exposed facets and morphology of Co 3 O 4 plays an important role in the catalysis. [42,43] Materials with exposed (110) planes show enhanced catalytic activity for methane oxidation compared with those only exposing (100) or (111) face...

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“…13,14 For the postsynthetic methods, active metal species are typically encapsulated in the meso-/macropores. [15][16][17][18][19][20] Therefore, mesoporous or hollow zeolites with crystalline walls are excellent choices, with potential applications in drug delivery and catalysis. [21][22][23] Due to a synthesis-inherent inhomogeneity in the aluminum and silicon distribution, hollow ZSM-5 zeolites can be prepared by simple base leaching.…”

mentioning

confidence: 99%

Cryo-TEM and electron tomography reveal leaching-induced pore formation in ZSM-5 zeolite

Ihli

et al. 2019

J. Mater. Chem. A

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Stable complete methane oxidation over palladium based zeolite catalysts

Cited by 208 publications

References 45 publications

Methane Mitigation: Methods to Reduce Emissions, on the Path to the Paris Agreement

Methane Mitigation: Methods to Reduce Emissions, on the Path to the Paris Agreement

Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion

Cryo-TEM and electron tomography reveal leaching-induced pore formation in ZSM-5 zeolite

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Stable complete methane oxidation over palladium based zeolite catalysts

Cited by 208 publications

References 45 publications

Methane Mitigation: Methods to Reduce Emissions, on the Path to the Paris Agreement

Methane Mitigation: Methods to Reduce Emissions, on the Path to the Paris Agreement

Bowtie‐Shaped NiCo2O4 Catalysts for Low‐Temperature Methane Combustion

Cryo-TEM and electron tomography reveal leaching-induced pore formation in ZSM-5 zeolite

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Bowtie‐Shaped NiCo₂O₄ Catalysts for Low‐Temperature Methane Combustion