Catalytic activity and long-term stability of palladium oxide catalysts for natural gas combustion: Pd supported on LaMnO3-ZrO2

Specchia, Vito; Palmisano, Pietro; Finocchio, Elisabetta; Vargas, M.A.; Busca, Guido

doi:10.1016/j.apcatb.2009.08.005

Cited by 21 publications

(20 citation statements)

References 67 publications

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“…These results are in line with CH 4 -TPC tests showed in Fig. 1, where the 300 and 450 h aged Pd/BaCeO 3 ·2ZrO 2 catalyst showed the typical Pd to PdO transformation during the cooling ramp [51,[63][64][65][66].…”

Section: Surface Characterization Of the Catalystsupporting

confidence: 94%

“…Sintering phenomena clearly occurred being the surface smooth with reduced micro porosity, as confirmed also by BET measurements ( Table 1). Similar effects have been notice in similar works performed by us on Pd/LaMnO 3 ·2ZrO 2 and Pd/CeO 2 ·2ZrO 2 catalysts [51,74]. The EDX analysis confirmed the presence of only Ba, Ce, Zr and Pd elements on the fresh sample, whereas on the aged samples, the peak of sulphur appeared, as further confirmation of the adsorption of sulphur oxide by the catalyst upon poisoning.…”

Section: Physico-chemical Characterization Of the Catalystssupporting

confidence: 87%

“…the temperature at which the methane conversion reached the 50% of conversion, are listed in Table 1 experiments. This hysteresis is strictly related to PdO decomposition to Pd upon heating and reformation upon cooling already noticed not only by us [51] but also by other authors in the literature [58,[63][64][65][66].…”

Section: Catalytic Characterization Of the Catalystmentioning

confidence: 78%

“…Thus, ZrO 2 is employed as structural promoter to limit the specific surface area loss caused by prolonged exposure to high temperatures [46]. Finally, dispersing a noble metal over a support intrinsically active towards catalytic oxidation, such as a perovskite [47][48][49][50][51][52], is expected to have favourable effects on the overall catalytic activity.…”

mentioning

confidence: 99%

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Surface chemistry and reactivity of Pd/BaCeO3∙2ZrO2 catalyst upon sulphur hydrothermal treatment for the total oxidation of methane

Finocchio¹,

Monteverde²,

Specchia³

2015

Applied Catalysis A: General

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Section: Surface Characterization Of the Catalystsupporting

confidence: 94%

Section: Physico-chemical Characterization Of the Catalystssupporting

confidence: 87%

Section: Catalytic Characterization Of the Catalystmentioning

confidence: 78%

mentioning

confidence: 99%

See 2 more Smart Citations

Surface chemistry and reactivity of Pd/BaCeO3∙2ZrO2 catalyst upon sulphur hydrothermal treatment for the total oxidation of methane

Finocchio¹,

Monteverde²,

Specchia³

2015

Applied Catalysis A: General

Self Cite

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“…For the catalytic combustion of CH 4 in lean conditions many different catalysts have been studied so far, ranging from noble metals, mainly Pd and/or Pt supported on oxides or mixed oxides [12][13][14][15], to perovskites [16][17][18], and non-noble oxides [19,20]. In particular, among non-noble oxides in recent years cobalt oxides attracted great attention thanks to their catalytic properties, useful in many different applications, for example as magnetic materials [21,22], electrochemical devices [23,24], and various catalytic systems [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

et al. 2016

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In this work a series of cobalt spinel catalysts was synthesized by different methods and doped with 1 wt% of palladium via incipient wetness impregnation or solution combustion synthesis (SCS). Both undoped and Pd-doped spinels were characterized from the structural and surface point of view (XRD, XRF, lRS, BET, FESEM) and tested toward the oxidation of methane in lean conditions, in gas mixtures containing from 0.5 to 2 vol% of CH 4 . These methane concentrations are typical of processes involving combustion of CH 4 in lean conditions as the after-treatment of unconverted CH 4 in compressed natural gas-fed vehicle exhausts, or the treatment of fugitive CH 4 from leaks in coal mines. The temperature window for the catalytic activity of the undoped Co 3 O 4 materials spread from 350 to 600°C. The preparation method affected the catalytic activity of undoped Co 3 O 4 , with the best catalytic activity related to the spinel prepared by SCS employing urea. The addition of 1 wt% of Pd lowered the temperature window for the catalytic activity to the range of 250-500°C, with insignificant differences for the various preparation methods. The beneficial effect of Pd-doping was assigned to the enhancement of the reduction of cobalt in the oxide structure.

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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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Catalytic activity and long-term stability of palladium oxide catalysts for natural gas combustion: Pd supported on LaMnO3-ZrO2

Cited by 21 publications

References 67 publications

Surface chemistry and reactivity of Pd/BaCeO3∙2ZrO2 catalyst upon sulphur hydrothermal treatment for the total oxidation of methane

Surface chemistry and reactivity of Pd/BaCeO3∙2ZrO2 catalyst upon sulphur hydrothermal treatment for the total oxidation of methane

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

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

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