Catalytic oxidation characteristics of CH 4 –air mixtures over metal foam monoliths

Li, Yanxia; Luo, Chaoming; Liu, Zhongliang; Sang, Lixia

doi:10.1016/j.apenergy.2015.05.053

Cited by 18 publications

(5 citation statements)

References 21 publications

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“…Even if pressure drops are higher with these catalysts compared to parallel channels, high mass-transfer − and thermal rates are achieved. However, there are only a few applications of structure foams as a support for catalytic oxidation of VOCs − and their widespread industrial use is limited by high costs of raw products and/or high operating costs for their synthesis. Nevertheless, recently, glass foams synthesized from a recycled glass at milder conditions than other foams (temperature of 800–900 °C against synthesis in many steps at more than 1300 °C for ceramic materials) were doped with zerovalent metal nanoparticles (aiming to 0.1 wt % metal) by a wet impregnation methodology in neat water at room temperature without a washcoat layer, rendering these materials eco-friendly and cheaper than other foams. , Owing to their very small size in the range of 2–5 nm, the metal active nanospecies present a high active surface area and thus potentially affording relevant surface reactivities.…”

Section: Introductionmentioning

confidence: 99%

Novel and Sustainable Catalytic Ruthenium-Doped Glass Foam for Thermocatalytic Oxidation of Volatile Organic Compounds: An Experimental and Modeling Study

Lejeune¹,

Cabrol²,

Lebullenger

et al. 2020

Ind. Eng. Chem. Res.

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An open cell foam catalyst consisting of a glass foam support impregnated with zerovalent ruthenium nanoparticles (aiming to 0.1 wt %) without washcoating was used for the first time to remove several volatile organic compounds (VOCs) by thermocatalytic oxidation. At initial concentrations between and 2 g·m–3 and temperatures ranging from 100 to 350 °C, up to 100% of removal was achieved for the four VOCs tested. The ease of abatement of the VOCs with temperature had the following order: ethanol > acetone > toluene > heptane. The removal of ethanol was then modeled considering mass-transfer limitation, temperature dependency, and by-product formation. Full mineralization of ethanol can be achieved with a 30 cm length reactor at 150 °C and 0.010 m·s–1. While the tortuous foam achieved efficient mass transfer, the process was still limited by this phenomenon highlighting that the efficiency of the catalyst could be improved at higher gas velocities.

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Section: Introductionmentioning

confidence: 99%

Novel and Sustainable Catalytic Ruthenium-Doped Glass Foam for Thermocatalytic Oxidation of Volatile Organic Compounds: An Experimental and Modeling Study

Lejeune¹,

Cabrol²,

Lebullenger

et al. 2020

Ind. Eng. Chem. Res.

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“…To the authors' best knowledge, Spadaccini et al conducted the first research, where two kinds of metal porous materials were used as substrates of catalysts in their experiments, and found that the addition of a porous platinum catalyst to their microscale gas turbine allowed for an increase in operable mass flow rates through the system, leading to an 8.5-fold increase in power density over the maximum achieved for a noncatalytic system of similar geometry [15]. In addition, in our previous work, we have found that the Pd/Al 2 O 3 /Fe-Ni metal foam monolithic catalyst exhibited high catalytic activity for methane reaction [16]. Moreover, a study on catalytic combustion within a porous inert medium was performed, in which SiC porous matrixes coated with perovskite were used to enhance the performance of combustion.…”

Section: Introductionmentioning

confidence: 85%

“…When the flame was located near the entrance (v = 0.4 m/s, as seen from Figure 4b), the temperature T 3 on the catalyst surface was more than 550 • C, which can be seen in Figure 5a. According to our previous study [16], it was found that the Pd/Al 2 O 3 /Fe-Ni catalyst exhibited high catalytic activity for methane reaction and the conversion was more than 90% at a temperature of 500 • C. For v ≥ 0.4 m/s, there was no doubt that the unburnt methane was almost oxidized by oxygen with the help of the activity of the catalyst when they flowed through the porous media. When the mixture entered into the combustor at 0.3 m/s velocity, a homogenous combustion occurred at the entrance of inlet.…”

Section: Exhaust Gas Analysismentioning

confidence: 93%

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Experimental Study on Catalytic Combustion of Methane in a Microcombustor with Metal Foam Monolithic Catalyst

Luo

Liu

et al. 2018

Catalysts

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Utilizing catalysts in microcombustors is probably an excellent practical solution to stabilize fuel combustion because of the relatively fast reaction speed. In the present work, the monolithic catalyst Pd/A2O3/Fe-Ni with metal foam as matrix was used inside a 5 mm in diameter microcombustor. Then the effects of inlet velocity and equivalent ratio on catalytic combustion characteristics of methane were studied experimentally. The results showed that the methane and air mixture with the stoichiometric ratio Φ = 1.0 could be ignited at v = 0.2–0.6 m/s. The velocity of premixed mixture had a great influence on the catalytic combustion of methane. The larger the inlet velocity, the higher the temperature and the brighter the flame were. The experiment results also showed that the equivalence ratio had a large essential impact on the catalytic combustion, especially for the lean mixture of methane and air. It seemed the addition of the porous matrix with catalysts could significantly extend the limits of stable combustion. In the detection of exhaust gas, CO selectivity increased and CO2 selectivity decreased with the equivalence ratio. When Φ was between 0.94 and 1.0 m/s, a little amount of hydrogen was produced due to the lack of oxygen. The measured conversion of methane to CO and CO2 was very high, usually greater than 99%, which indicated the excellent performance of the catalyst.

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“…Li et al [16] used Fe-Ni alloy (30%Ni-70%Fe) foam with unique three-dimensional non-regular channels as a monolithic carrier. After supporting a thin coating layer of γ-Al 2 O 3 , Pd was deposited on by an impregnation method.…”

Section: Monolithic Carriersmentioning

confidence: 99%

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

et al. 2019

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Monolithic catalysts have great industrial application prospects compared to powdered catalysts due to their low pressure drop, the high efficiency of mass and heat transfer, and recyclability. Deposition of active phases on the monolithic carriers dramatically increases the utilization rate and has been attracting continuous attention. In this paper, we reviewed the traditional (impregnation, coating, and spraying) and novel (hydrothermal and electrodeposition) strategies of surface deposition integration, analyzed the advantages and disadvantages of both ways, and then prospected the possible directions for future development of integration technologies.

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Catalytic oxidation characteristics of CH 4 –air mixtures over metal foam monoliths

Cited by 18 publications

References 21 publications

Novel and Sustainable Catalytic Ruthenium-Doped Glass Foam for Thermocatalytic Oxidation of Volatile Organic Compounds: An Experimental and Modeling Study

Novel and Sustainable Catalytic Ruthenium-Doped Glass Foam for Thermocatalytic Oxidation of Volatile Organic Compounds: An Experimental and Modeling Study

Experimental Study on Catalytic Combustion of Methane in a Microcombustor with Metal Foam Monolithic Catalyst

Fabrication of Monolithic Catalysts: Comparison of the Traditional and the Novel Green Methods

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