The influence of gas composition on Pd-based catalyst activity in methane oxidation − inhibition and promotion by NO

Sadokhina, Nadezda; Smedler, Gudmund; Nylén, Ulf; Olofsson, Marcus; Olsson, Louise

doi:10.1016/j.apcatb.2016.07.012

Cited by 60 publications

(29 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The kinetic model could not simulate such a large T 50 increase simultaneously with 98 °C T 50 growth for the heating step using only one water inhibition term. In a similar experiment (data not shown here), when the temperature ramp was repeated in the presence of water, the heating step of the second ramp demonstrated slightly higher T 50 than the cooling in the first ramp and thereafter similar value for the second cooling [32]. Thus, two water effects were observed: first, an immediate catalytic activity loss and, secondly, a slow deactivation originating from the hydroxyl groups that were gradually built up.…”

Section: Kinetic Model For Methane Oxidation Under Dry and Wet Conditmentioning

confidence: 59%

“…4. In our earlier study it was proposed that there are two deactivation modes from water; the first one is fast deactivation relating to water adsorption and the second one is slow deactivation caused by hydroxyl species formation [32]. Our experimental data suggest that methane oxidation depends on active sites S*, which will be blocked by these species (S*-OH), resulting in that methane oxidation is hindered.…”

Section: Kinetic Modelmentioning

confidence: 70%

“…In the model, this suggestion is described by the inhibition term included in the rate of reaction R1. Moreover, the significantly lower activity during the cooling step may be attributed to the hydroxyl species formation that was previously suggested for Pd-based catalysts [6,8,32,55]. We suggest that this formation has a low rate and quite high energy barrier, resulting in that the water inhibition by the hydroxyl group formation is a slow process and therefore seen more clearly during the cooling step compared to the first heating ramp.…”

Section: Kinetic Model For Methane Oxidation Under Dry and Wet Conditmentioning

confidence: 80%

“…The LH water term in the denominator will account for the fast water deactivation and the addition of S * will account for the slow water deactivation, and thereby both deactivation modes observed experimentally [32] are present in the model.…”

Section: Kinetic Modelmentioning

confidence: 99%

“…The catalyst contained 0.6 wt% Pt, 3.2 wt% Pd and 20 wt% CeO 2 on δ-Al 2 O 3 . Details on the catalyst synthesis can be found in [32]. The monolith sample was placed into a quartz flow reactor using insulation around the monolith to avoid gases bypassing.…”

Section: Sample Preparation and Activity Measurementsmentioning

confidence: 99%

See 4 more Smart Citations

An Experimental and Kinetic Modelling Study for Methane Oxidation over Pd-based Catalyst: Inhibition by Water

et al. 2017

Self Cite

View full text Add to dashboard Cite

Section: Kinetic Model For Methane Oxidation Under Dry and Wet Conditmentioning

confidence: 59%

Section: Kinetic Modelmentioning

confidence: 70%

Section: Kinetic Model For Methane Oxidation Under Dry and Wet Conditmentioning

confidence: 80%

Section: Kinetic Modelmentioning

confidence: 99%

Section: Sample Preparation and Activity Measurementsmentioning

confidence: 99%

See 3 more Smart Citations

An Experimental and Kinetic Modelling Study for Methane Oxidation over Pd-based Catalyst: Inhibition by Water

et al. 2017

Self Cite

View full text Add to dashboard Cite

Current Progress on Methods and Technologies for Catalytic Methane Activation at Low Temperatures

et al. 2022

View full text Add to dashboard Cite

Methane (CH 4 ) is an attractive energy source and important greenhouse gas. Therefore, from the economic and environmental point of view, scientists are working hard to activate and convert CH 4 into various products or less harmful gas at low-temperature. Although the inert nature of C-H bonds requires high dissociation energy at high temperatures, the efforts of researchers have demonstrated the feasibility of catalysts to activate CH 4 at low temperatures. In this review, the efficient catalysts designed to reduce the CH 4 oxidation temperature and improve conversion efficiencies are described. First, noble metals and transition metal-based catalysts are summarized for activating CH 4 in temperatures ranging from 50 to 500 °C. After that, the partial oxidation of CH 4 at relatively low temperatures, including thermocatalysis in the liquid phase, photocatalysis, electrocatalysis, and nonthermal plasma technologies, is briefly discussed. Finally, the challenges and perspectives are presented to provide a systematic guideline for designing and synthesizing the highly efficient catalysts in the complete/partial oxidation of CH 4 at low temperatures.

show abstract

Methane Oxidation over PdO: Towards a Better Understanding of the Influence of the Support Material

et al. 2023

View full text Add to dashboard Cite

The presence of water vapor during the oxidation of the strong greenhouse gas methane over PdO‐based catalysts is known to result in severe inhibition and catalyst deactivation. In this context, our current study elucidates the role of the support material for different water concentrations in the reaction gas mixture. Compared to a reference PdO/Al2O3 catalyst, the catalytic activity can be significantly enhanced when using SnO2 and ZrO2 as support materials and remains stable during 24 h of operation at 823 K in the presence of 12 % H2O, whereas under identical conditions CH4 conversion drops by 68 % over PdO/Al2O3. The interplay between Pd species and catalyst support was systematically characterized by thermogravimetric analysis, temperature‐programmed reduction experiments and TEM measurements. Finally, a kinetic scheme was derived based on the experimental data.

show abstract

The influence of gas composition on Pd-based catalyst activity in methane oxidation − inhibition and promotion by NO

Cited by 60 publications

References 37 publications

An Experimental and Kinetic Modelling Study for Methane Oxidation over Pd-based Catalyst: Inhibition by Water

An Experimental and Kinetic Modelling Study for Methane Oxidation over Pd-based Catalyst: Inhibition by Water

Current Progress on Methods and Technologies for Catalytic Methane Activation at Low Temperatures

Methane Oxidation over PdO: Towards a Better Understanding of the Influence of the Support Material

Contact Info

Product

Resources

About