Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

Liu, Ying; Wang, Sheng; Sun, Tianjun; Gao, Diannan; Zhang, Chunxi

doi:10.1016/j.apcatb.2012.02.032

Cited by 39 publications

(21 citation statements)

References 56 publications

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“…For example, Liu et al. postulated that the formation of a NiAl 2 O 4 spinel was responsible of the stabilization of a Pd/Al 2 O 3 catalyst doped with Ni 2+ under steam at 600 °C . These observations are also in line with previous studies of Wang et al .…”

Section: Resultssupporting

confidence: 76%

Inhibition by Inorganic Dopants of γ‐Alumina Chemical Weathering under Hydrothermal Conditions: Identification of Reactive Sites and their Influence in Fischer–Tropsch Synthesis

et al. 2017

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Understanding how alumina degradation to boehmite AlOOH can be prevented under hydrothermal conditions is key to design more stable catalysts supported on alumina for Fischer–Tropsch synthesis. We compare the effect of four inorganic dopants to inhibit γ‐alumina chemical weathering under hydrothermal conditions: three metal ions: Mg2+, Zr4+, Ni2+, introduced by impregnation, and nonmetal Si, introduced by the grafting of tetraethyl orthosilicate. Boehmite is formed by a mechanism of dissolution–precipitation. A significant decrease of alumina weathering to boehmite is evidenced for all dopants. For metal ions, the thermal conversion of doped γ‐Al2O3 into an alumina‐rich mixed oxide or the coverage of the alumina surface by particles of a poorly soluble oxide such as NiO contribute to the stabilization of the solid. Alumina dissolution and degradation are only inhibited fully through Si grafting. IR spectra in the OH stretching region suggest that the most reactive alumina sites toward dissolution are basic Al−OH sites located on lateral facets that are blocked upon Si introduction. Fischer–Tropsch reactivity shows that Co catalysts prepared on Mg2+‐ and Si‐doped supports are less active or, at best, as active as a reference Co/γ‐Al2O3 catalyst, which is explained by a lower reducibility of CoO on doped supports. The Co catalyst prepared on Mg2+‐doped γ‐Al2O3 calcined at 900 °C exhibits the best combination of catalytic activity, ease of preparation, and hydrothermal stability.

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Section: Resultssupporting

confidence: 76%

Inhibition by Inorganic Dopants of γ‐Alumina Chemical Weathering under Hydrothermal Conditions: Identification of Reactive Sites and their Influence in Fischer–Tropsch Synthesis

et al. 2017

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“…Am ore recent investigation by Liu et al reported that, during 3200 ho famethanec ombustion experiment at 600 8C, palladium supported on nickelmodified alumina catalyst demonstrated as tability improvement. [96] It was suggested that the stability of Pd/NiOÀAl 2 O 3 catalyst improved by optimizing the Ni/Al ratio.…”

Section: Palladium-based Catalystsmentioning

confidence: 99%

Development of Combustion Technology for Methane Emitted from Coal‐Mine Ventilation Air Systems

2017

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Fugitive gas emissions from coal mining are widely known to be significant contributors to the emission of alkanes, mainly methane, to the environment. Utilization of coal‐mine ventilation air methane (VAM) is a crucial mission to minimize methane emission in the atmosphere. This paper reviews current technology for mitigation and utilization of methane emissions from coal mining. Challenges and opportunities for each technology are discussed together with their benefits/disadvantages. Catalytic combustion technology is recommended as the best option due to the low and variable concentration of methane in coal‐mine ventilation air, as well as its high volumetric flow. Herein, current developments in flameless combustion are discussed in detail with a few highlights on palladium‐based catalyst development. The remaining uncertainties and obstacles in the development of palladium‐based catalysts for VAM are also discussed. This paper highlights a few important practical aspects that necessitate further detailed investigation, such as catalyst deactivation phenomena, the stability of the catalyst under humid conditions, and the effect of coal dust on catalytic activity and stability. Notably, a pressure decrease, heat recovery/self‐sustaining, and long‐term deactivation are key for the successful development of VAM catalytic combustors.

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“…Methane is the main constituent of natural gas and is commonly employed as an energy resource. However, methane is the second largest contributor to global warming after carbon dioxide, and it has a global warming potential 21 times higher than the same mass of carbon dioxide [1]. Therefore, the efficient combustion of methane and its controlled emission is of importance in various industrial fields, such as natural gas-fueled vehicles, power plants, burners, boilers, and incinerators [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Catalytic methane combustion could therefore be considered a suitable alternative to conventional thermal oxidation, as it can minimize thermal NO x generation due to its lower operation temperatures. Thus, the catalytic combustion of methane has been extensively studied using a range of catalysts including CeO 2 [4], Al 2 O 3 [5][6][7][8][9], ZrO 2 [10][11][12][13], MgAl 2 O 4 [2,14], NiAl 2 O 4 [1,15], and SnO 2 [16] supported metal catalysts, and supported Pd catalysts are the most widely utilized to date.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment

2019

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The improvement of methane combustion activity was observed in cyclic temperature-programed and isothermal reactions over Pd/ZrO2 catalysts by simple reduction/reoxidation treatment. The catalytic activity increased during the initial stages of isothermal reaction, and the light-off temperature was lowered as the number of cycles increased in the cyclic temperature-programed reaction. To reveal the origin of activation, variations in the reduction properties after the activation period were carefully investigated through CH4 temperature-programed reduction (TPR) measurements. From the CH4-TPR results, it was confirmed that the reduction temperature decreased significantly after activation. The observation of the CH4-TPR peak at relatively low temperatures is directly proportional to the catalytic activity of CH4 combustion. It was therefore concluded that repeated reduction/reoxidation occurred in the reactant stream, and this phenomenon allowed the combustion reaction to proceed more easily at lower temperatures.

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Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

Cited by 39 publications

References 56 publications

Inhibition by Inorganic Dopants of γ‐Alumina Chemical Weathering under Hydrothermal Conditions: Identification of Reactive Sites and their Influence in Fischer–Tropsch Synthesis

Inhibition by Inorganic Dopants of γ‐Alumina Chemical Weathering under Hydrothermal Conditions: Identification of Reactive Sites and their Influence in Fischer–Tropsch Synthesis

Development of Combustion Technology for Methane Emitted from Coal‐Mine Ventilation Air Systems

Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment

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