Catalysis in Combustion

Pfefferle, Lisa D.; Pfefferle, William C.

doi:10.1080/01614948708078071

Cited by 443 publications

(128 citation statements)

References 68 publications

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“…Nevertheless, there remains a major problem for the application of catalytic combustion unsettled, namely, the scarcity of robust and stable catalysts for catalytic combustion under severe hydrothermal conditions [13,14]. Extensive efforts have been made to develop suitable catalysts and overcome these key obstacles for commercial applications.…”

Section: Introductionmentioning

confidence: 99%

Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites

Jiang

Hao

et al. 2005

Catal Lett

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Novel Cu-Mg/Al mixed oxides (designated as i-CMAO-800) were prepared by calcinations of Cu-Mg/Al-hydrotalcites [(Cu 2þ +Mg 2þ )/Al 3þ = 3] at 800 C. Their performance for the catalytic combustion of methane was investigated. The oxides and their precursors were characterized by XRD, TG-DSC, TPR and N 2 adsorption/desorption techniques. The results showed that BET surface areas and the stability of the resultant oxides were greatly influenced by the copper contents in hydrotalcite precursors, bringing about difference in their activities for methane catalytic combustion. XRD results indicated that Cu was highly dispersed in hydrotalcite precursors in case of low copper contents, (Cu 40 wt%). For higher Cu contents, Cu(OH) 2 was formed, and, consequently, a separate phase of CuO was detected in the oxide catalysts after calcination. As indicated by the TG-DSC results, different decomposition behaviors were observed for various hydrotalcites. Thermal calcination promoted the formation of copper aluminates and segregation of CuO from the bulk phases. TPR results showed 15CMAO-800 has the highest reduction rate, and the catalytic activities of iCMAO-800 mixed oxides depend on both the reduction rates and the amounts of copper ions in mixed oxides. The catalyst 15-CMAO-800 showed the best performance.

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Section: Introductionmentioning

confidence: 99%

Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites

Jiang

Hao

et al. 2005

Catal Lett

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“…The 1.5CoMAO-800 catalyst shows the best methane combustion activity, igniting methane at 450°C and completing methane combustion around 600°C. The catalytic combustion activity over the xCoMAO-800 oxides are closely related to the strong Co-Mg/Al interaction within the mixed oxides according to the TG-DSC, TPR and activity characteristics.© 2009 Elsevier B.V. All rights reserved.The catalytic combustion of methane has attracted intensive interests in the past few decades, due to its higher energy conversion efficiency and ultra-low emissions of environmental pollutants, such as NO x , CO, and unburned hydrocarbons [1][2][3][4][5][6]. In addition, catalytic combustion of lean methane gas to abate methane emission also has wide-ranging applications [5,7].…”

mentioning

confidence: 99%

“…The catalytic combustion of methane has attracted intensive interests in the past few decades, due to its higher energy conversion efficiency and ultra-low emissions of environmental pollutants, such as NO x , CO, and unburned hydrocarbons [1][2][3][4][5][6]. In addition, catalytic combustion of lean methane gas to abate methane emission also has wide-ranging applications [5,7].…”

mentioning

confidence: 99%

Catalytic combustion of methane over mixed oxides derived from Co–Mg/Al ternary hydrotalcites

Jiang

Cheng

et al. 2010

Fuel Processing Technology

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Co x Mg 3 − x /Al composite oxides (xCoMAO-800) were prepared by calcination of Co x Mg 3 − x /Al hydrotalcites (x = 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, respectively) at 800°C. The materials were characterized using XRD, TG-DSC, N 2 adsorption-desorption and TPR. The methane catalytic combustion over the xCoMAO-800 was assessed in a fixed bed micro-reactor. The results revealed that cobalt can be homogenously dispersed into the matrices of the hydrotalcites and determines the structure, specific surface areas and porosity of the derived xCoMAO-800 oxide catalysts. The thermal stability and homogeneity of the hydrotalcites markedly depends on the cobalt concentration in the hydrotalcites. The Co-based hydrotalcite-derived oxides exhibit good activity in the catalytic combustion of methane. The catalytic activity over the xCoMAO-800 oxides enhances with increasing x up to 1.5, but subsequently decreases dramatically as cobalt loadings are further increased. The 1.5CoMAO-800 catalyst shows the best methane combustion activity, igniting methane at 450°C and completing methane combustion around 600°C. The catalytic combustion activity over the xCoMAO-800 oxides are closely related to the strong Co-Mg/Al interaction within the mixed oxides according to the TG-DSC, TPR and activity characteristics.© 2009 Elsevier B.V. All rights reserved.The catalytic combustion of methane has attracted intensive interests in the past few decades, due to its higher energy conversion efficiency and ultra-low emissions of environmental pollutants, such as NO x , CO, and unburned hydrocarbons [1][2][3][4][5][6]. In addition, catalytic combustion of lean methane gas to abate methane emission also has wide-ranging applications [5,7]. For the effective and stable catalytic combustion process, suitable catalysts play a crucial role. Generally, supported noble metal oxides, particularly palladium oxide, are excellent catalysts for lower temperature combustion, but noble metals are expensive and prone to deactivation owing to sintering, decomposition and undesirable interaction with supports under hydrothermal situations encountered in combustion [3,6,[8][9][10]. A variety of inexpensive transition metal oxide catalysts, such as solid solution oxides [11][12][13], perovskites [14][15][16], pyrochlores [17][18][19] and hexaaluminates [7,[20][21][22] have been explored for catalytic combustion of methane. Unfortunately, no single catalyst, so far, can tolerate the stringent hydrothermal conditions existing in methane combustion. Obviously, the further development of new combustion catalysts is indispensable. Currently, multi-staged combustion methodology are used to overcome the drawbacks of the current catalysts for catalytic combustion [2,3], in which the catalysts of high surface area and activity are highly desired to ignite methane at lower temperatures and sustain stable combustion at high temperatures.Among the transition metal oxide catalysts, cobalt-based oxides are ones of the most active catalysts in catalytic methane combustion, and Co...

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“…(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) can principally be used in the numerical simulation of laminar as well as turbulent flow fields; the so-called Direct Numerical Simulations, DNS. In practice, however, the solution of the Navier-Stokes equations for turbulent flows demands a prohibitive amount of computational time due to the huge number of grid points needed to resolve the small scales of turbulence.…”

Section: Modeling Of the Interactions 275mentioning

confidence: 99%

“…Catalytic monoliths can serve as an example. They are frequently used for the reduction of pollutant emissions from automobiles [1], selective oxidation [2][3][4] and reforming of hydrocarbons [5,6], and combustion of natural gas [7][8][9]. Figure 1 illustrates the physics and chemistry in a catalytic combustion monolith that glows at a temperature of about 1,300 K due to the exothermic oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Interactions Between Catalytic Surfaces and Gas-Phase

Deutschmann

2014

Catal Lett

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The catalytic surface interacts with the gasphase by a variety of chemical and physical processes. Hence, optimization of design and operation conditions of catalytic reactors do not only require the understanding of the catalytic reaction sequence but also its coupling with mass and heat transport and potential homogeneous reactions. The chemical, thermal, and mass-transport interactions between the catalytic surface and the gas-phase are discussed in terms of the individual and combined interactions. The state-of-the-art modelling of reactive flows and its coupling with the catalytic surface is summarized. The interactions are illustrated by a number of examples such as reforming of hydrocarbons, catalytic combustion, exhaust-gas after-treatment, each focusing on a special aspect of catalyst-gas interactions. The potentials and limitations of the numerical simulations will be discussed including experimental techniques for model validation.

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Catalysis in Combustion

Cited by 443 publications

References 68 publications

Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites

Catalytic combustion of methane on novel catalysts derived from Cu-Mg/Al-hydrotalcites

Catalytic combustion of methane over mixed oxides derived from Co–Mg/Al ternary hydrotalcites

Modeling of the Interactions Between Catalytic Surfaces and Gas-Phase

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