Catalytic combustion of low-concentration coal bed methane over CuO/γ-Al2O3catalyst: effect of SO2

Yang, Zhongqing; Liu, J.; Zhang, L.; Zheng, Shan Suo; Guo, Mingnv; Yan, Yunfei

doi:10.1039/c4ra05334f

Cited by 22 publications

(10 citation statements)

References 18 publications

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“…Oxidation and reforming reactions have both been reported on these noble metal catalysts, and a high reactivity is achieved at a low temperature. The chemisorption of methane on noble metal atoms or metal clusters is considered the first step of the process of activating methane on the active sites [8][9][10]. After adsorption, dehydrogenation begins, in which hydrogen combines with the chemisorbed oxygen (oxidation process) or adsorbs on the metal surface (reforming or decomposition process).…”

Section: Introductionmentioning

confidence: 99%

Methane oxidation with low O2/CH4 ratios in the present of water: Combustion or reforming

Geng

Yang

Zhang

et al. 2017

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 99%

Methane oxidation with low O2/CH4 ratios in the present of water: Combustion or reforming

Geng

Yang

Zhang

et al. 2017

Energy Conversion and Management

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“…This indicates that SO 2 tends to impact the activity of CoGO50, irreversibly. SO 2 can strongly adsorb on the catalyst via the reactions of Co 3 O 4 + SO 2 → Co 3 O 4 ·SO 2 , which may further form sulphates through the reactions of 2Co 3 O 4 ·SO 2 + O 2 → 2Co 3 O 4 ·SO 3 or Co 3 O 4 ·SO 3 → Co 3 (SO 4 ) 4 42 .…”

Section: Resultsmentioning

confidence: 99%

Low-temperature combustion of methane over graphene templated Co3O4 defective-nanoplates

Gong

Zeng

2021

Sci Rep

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Transition metal oxides are the potential catalysts to replace noble-metal based catalyst for the catalytic combustion of methane due to the tolerable reactivity and low cost. However, these catalysts are challenged by the low temperature reactivity. Herein, the surface defective Co3O4 nanoplates are realized through a facile co-precipitation and thermal reduction method with the association of GO. The resultant catalysts (CoGO50) demonstrate a superior low-temperature reactivity for the methane oxidation to CO2 and H2O in comparison with the common Co3O4 catalyst. The reliable stability of CoGO50 catalyst was proved by 80 h testing with intermittent feeding of water vapor. The experimental analysis demonstrates that the presence of a small amount of GO significantly affects the catalysts in surface valence state, active oxygen species and surface oxygen vacancies through reacting with the cobalt oxide as a reductant. Moreover, GO plays as 2D confine template to form smaller and thinner nanoplates. This work provides a facile method to control the surface properties of catalyst not only for Co3O4 based catalysts but also for wider solid catalysts.

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“…If these CMMs cannot be utilized, these would be released directly into the atmosphere leading to resources waste and environmental pollution. About 19 billion m 3 of CMM is emitted into the air every year, which is greater than 20,000 t standard coal (Yang et al 2014;Ma 2007). And the annual emissions are still increasing.…”

Section: Introductionmentioning

confidence: 99%

A review of oxygen removal from oxygen-bearing coal-mine methane

Zhao

Zhang

Sun

et al. 2017

Environ Sci Pollut Res

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In this article, a comparison will be made concerning the advantages and disadvantages of five kinds of coal mine methane (CMM) deoxygenation method, including pressure swing adsorption, combustion, membrane separation, non-metallic reduction, and cryogenic distillation. Pressure swing adsorption has a wide range of application and strong production capacity. To achieve this goal, adsorbent must have high selectivity, adsorption capacity, and adequate adsorption/desorption kinetics, remain stable after several adsorption/desorption cycles, and possess good thermal and mechanical stabilities. Catalytic combustion deoxygenation is a high-temperature exothermic redox chemical reaction, which releases large amounts of thermal energy. So, the stable and accurate control of the temperature is not easy. Meanwhile partial methane is lost. The key of catalytic combustion deoxygenation lies in the development of high-efficiency catalyst. Membrane separation has advantages of high separation efficiency and low energy consumption. However, there are many obstacles, including higher costs. Membrane materials have the requirements of both high permeability and high selectivity. The development of new membrane materials is a key for membrane separation. Cryogenic distillation has many excellence advantages, such as high purity production and high recovery. However, the energy consumption increases with decreasing CH concentrations in feed gas. Moreover, there are many types of operational security problems. And that several kinds of deoxygenation techniques mentioned above have an economic value just for oxygen-bearing CMM with methane content above 30%. Moreover, all the above methods are not applicable to deoxygenation of low concentration CMM. Non-metallic reduction method cannot only realize cyclic utilization of deoxidizer but also have no impurity gases generation. It also has a relatively low cost and low loss rate of methane, and the oxygen is removed thoroughly. In particular, the non-metallic reduction method has good development prospects for low concentration oxygen-bearing CMM. This article also points out the direction of future development of coal mine methane deoxygenation.

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Catalytic combustion of low-concentration coal bed methane over CuO/γ-Al₂O₃catalyst: effect of SO₂

Cited by 22 publications

References 18 publications

Methane oxidation with low O2/CH4 ratios in the present of water: Combustion or reforming

Methane oxidation with low O2/CH4 ratios in the present of water: Combustion or reforming

Low-temperature combustion of methane over graphene templated Co3O4 defective-nanoplates

A review of oxygen removal from oxygen-bearing coal-mine methane

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