La–Ag–Co perovskites for the catalytic flameless combustion of methane

Buchneva, O.; Rossetti, Ilenia; Biffi, C.; Allieta, Mattia; Kryukov, A.; Lebedevа, N. Sh.

doi:10.1016/j.apcata.2009.09.025

Cited by 28 publications

(39 citation statements)

References 33 publications

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“…As mentioned before, the catalytic activity, durability, and stability of a perovskite catalyst are powerfully associated to its crucial characteristics such as morphology, particle size, and crystallinity. Buchneva et al 117 performed characterization a series of Ag-doped LaCoO 3 and LaMnO 3 perovskite catalysts by preparing with FP and SG methods. Depending on the field of application, one of these methods is preferred.…”

Section: Effect Of Preparation Methodsmentioning

confidence: 99%

“…Even small amounts of noble metals, mostly substituted in the B position, increases the efficiency and selectivity of perovskites in exhaust cleaning processes. Buchneva et al 117 declared that the degree of incorporation of Ag in the perovskite lattice is generally weak, and the extra framework possibly exhibiting its catalytic activity may be assigned as metallic Ag, provided that the appropriate Ag crystal size is attained. When this confusion is considered, it can be stated that some uncertain situations arise from the synthesis process or the pretreatment process of the catalysts.…”

Section: Pd-doped Perovskite Catalystsmentioning

confidence: 99%

“…118,190 The poisoning mechanism resulting from the interaction with SO 2 has been studied in the literature. 117,118,[192][193][194] Rosso et al 195 evaluated the role of chromium in the perovskite structure by comparing it with other Cr-free perovskites in the literature. 82 Zhu et al 191 studied on the oxidation and poisoning mechanism of SO 2 with LaCoO 3 /Al 2 O 3 film model catalyst.…”

Section: Impact and Consequence Of Sulfur Presence On Perovskite Camentioning

confidence: 99%

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Perovskite catalysts for methane combustion: applications, design, effects for reactivity and partial oxidation

Başhan

Üst

2019

Int J Energy Res

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Summary This review underlines the importance of the developments in perovskite catalysts for methane combustion from the past up to the present. In this review, after a general and brief introduction to perovskites, the mechanisms of catalytic combustion of methane have been included. Moreover, current studies on perovskites have been summarized including the effects of substitutions, doped perovskites, perovskite preparation methods, and the effect of sulfur presence on perovskite catalysts. Besides, recent studies on perovskite oxides and phenomenon of oxygen (O2) deficiency, porous perovskite oxides, and nanostructured perovskites have been conducted. In addition, partial oxidation of methane (POM) has been reviewed. The loss of active component during the POM reaction can take place in the nickel catalyst, in particular. Since nickel has a lower melting point than noble metals and other active components, such as Co and Fe, in general, to deactivate nickel is easier. Compared with conventional structure, the porous structure with the unique morphology significantly enhances the catalytic activity through a much larger surface area (SA) and greater reactivity of the active sites. Furthermore, the monolithic nanoarrayed perovskite presents very good results in well‐defined faceted catalysts and takes part in porous channel hydrocarbon combustion. This review study is prepared as a guide to cover the profound knowledge of perovskite oxides catalysts, considering the methane combustion reaction mechanisms, and addresses prospective studies in this field for researchers.

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Section: Effect Of Preparation Methodsmentioning

confidence: 99%

Section: Pd-doped Perovskite Catalystsmentioning

confidence: 99%

Section: Impact and Consequence Of Sulfur Presence On Perovskite Camentioning

confidence: 99%

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Perovskite catalysts for methane combustion: applications, design, effects for reactivity and partial oxidation

Başhan

Üst

2019

Int J Energy Res

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“…Conversion of CH 4 to more expensive fuels, useful chemicals, and heat have been proposed to convert it into hydrogen-rich gases on Ca-based sorbents (Wang et al 2011) and Ni-containing catalyst in membrane reactor (Kyriakides et al 2013) or flow reactor (Corbo et al 2009), olefins (Patcharavorachot et al 2014), liquefaction processing (Yoon et al 2012), methanol (Mendes et al 2014), and products of catalytic combustion (Buchneva et al 2009). Flameless catalytic combustion of natural and oil gases without formation of nitrogen oxides is one of the most promising ways for utilization of CH 4 and other alkanes to produce heat and CO 2 (Bhavsar et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Environmentally friendly catalytic combustion of gaseous fuel to heat greenhouses

Тунгатарова

Zheksenbaeva

Abdukhalykov

et al. 2016

Clean Techn Environ Policy

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Data on the study of thermally stable manganese oxide catalysts for deep oxidation of lean CH 4 and propane-butane mixtures in air into CO 2 are presented in the paper. New approaches to the synthesis of polyoxide catalysts based on Mn, modified with rare earth elements (La, Ce) and alkaline earth elements (Ba, Sr) when its supporting from nitrate solutions onto the alumina granules stabilized with 2 % Ce were used in the preparation of catalysts. Polyoxide thermally stable (up to 1473 K) highperformance Mn-containing catalyst for deep oxidation of CH 4 and propane-butane in gas-air mixture was developed. Prototype of the catalytic heat generator for environmentally friendly burning of methane and propane-butane mixture was created. Experienced tests of the catalytic heat generator for heating of greenhouses were performed and carbon dioxide fertilizing of plants by combustion products of propane-butane mixture was carried out. REERare earth elements AEE Alkaline earth elements a CH4 Degree of CH 4 conversion XRD X-ray diffraction TEM Transmission electron microscopy BET Brunauer-Emmett-Teller method ESDR Electronic spectroscopy of diffuse reflections TPD Temperature-programmed desorption TPR Temperature-programmed reduction TPO Temperature-programmed oxidation S Surface area

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“…The total activity of silver containing series may be defined by the correlation of 4 factors [40]. Silver incorporation in framework position increases the concentration of lattice defects, which in turn affect oxygen mobility through the framework.…”

Section: Catalytic Activitymentioning

confidence: 99%

Perovskite-like catalysts for the catalytic flameless combustion of methane

2012

Self Cite

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QUESTIONNAIREThe catalytic flameless combustion (CFC) of methane outperforms conventional flame combustion because of lower emission of pollutants (HC, CO and NO x ) and high thermal efficiency. The catalysts traditionally used for CFC are mainly based on supported noble metals, such as Pd and Pt, which ensure high activity, however accompanied by some drawbacks, due to high cost and poor thermal and chemical stability. La-based catalysts with ABO 3 perovskite-like structure have been proposed as a valid alternative for the present application. Indeed, perovskite catalysts combine low cost, thermochemical stability at high operating temperature and satisfactory catalytic activity. In spite of this, there are still some open questions, especially regarding their resistance to sulphur poisoning when used for the CFC of methane. Indeed, the poisoning mechanism of perovskite-like catalysts has not been completely understood and only a few papers deal with this very important topic.In general, the partial substitution of the perovskitic lattice metal ions is one of the important means to modulate catalytic activity. In LaBO 3 perovskites, the influence of dopants such as A' 2+ and A' 4+ has been widely investigated in the literature.* Corresponding author: fax +39-02-50314300; e-mail ilenia.rossetti@unimi.it 2In the recent past, attention has been devoted to catalyst nanostructuring, aiming at obtaining high surface area and defectivity, which should enhance oxygen mobility through the lattice and ensure good catalytic activity. To this purpose, we set up and optimised a flame-pyrolysis (FP) apparatus for the onestep synthesis of perovskitic mixed oxides. It is based on a specially designed burner fed with oxygen and an organic solution of the precursors, the solvent acting as fuel for the flame. FP-synthesized perovskites, showed good phase purity, along with nanometer-size particles and hence very high surface area (sometimes in excess of 100 m 2 /g). In addition, the high temperature of the flame in principle should also ensure thermal stability.In the present work we prepared a set of samples by FP, namely La 1-x A x MeO 3 , with A' = Ce, Sr, Ag Me=Mn, Co, x=0, 0.1, 0.2, either pure or doped with noble metals (Pt, Pd or Ag). In addition silver containing samples were synthesized by a traditional sol-gel (SG) method. The catalysts were tested for the CFC of methane, monitoring the activity by online mass spectrometry. Also the resistance to sulphur poisoning was investigated, using tetrahydrothiophene as poisoning agent.

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La–Ag–Co perovskites for the catalytic flameless combustion of methane

Cited by 28 publications

References 33 publications

Perovskite catalysts for methane combustion: applications, design, effects for reactivity and partial oxidation

Perovskite catalysts for methane combustion: applications, design, effects for reactivity and partial oxidation

Environmentally friendly catalytic combustion of gaseous fuel to heat greenhouses

Perovskite-like catalysts for the catalytic flameless combustion of methane

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