Combustion of methane over palladium catalyst in the presence of inorganic compounds: inhibition and deactivation phenomena

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

“…The data were collected under 10% of methane conversion during the heating ramp of the experiment and resulted in an activation energy of 102 kJ/ mol, which was used for all the simulations performed. The activation energies presented in the literature for methane oxidation over Pd-based catalysts span across a broad range from 60 to 190 kJ/mol depending on the water presence and the type of support [15,16,29,30,[52][53][54]. The three reactions and their corresponding rates shown in Tables 2 and 3 were used to simulate the methane oxidation experiments.…”

“…There are also a few kinetic models available for methane oxidation in the presence of water vapour. For methane oxidation most commonly the Langmuir-Hinshelwood-Hougen-Watson (LHHW) type of the rate equations is used in literature [22][23][24][25][26][27][28]; however, Mars-van Krevelen (MVK) based equations can also be used to describe mechanism of methane oxidation [29,30]. The oxidation of CH 4 over PdO is strongly inhibited by H 2 O, with a negative reaction order (−1) [15].…”

“…Fernández et al [24] and Abbasi et al [25] have also successfully used this rate expression for their methane oxidation simulations over Pd-and Pt-Pd-based catalysts, respectively. Moreover, detailed modelling work on methane oxidation with a focus on water inhibition was performed by Hurtado et al [29]. Various rate equations based on Langmuir-Hinshelwood (LH), Eley-Rideal (ER), and MVK mechanisms were investigated and it was concluded that experimental data obtained on Pd/alumina can be successfully modelled by the MVK mechanism.…”

Studies on the influence of H 2 S and SO 2 on the activity of a PdO/Al 2 O 3 catalyst for removal of oxygen by total oxidation of (bio-)methane at very low O 2 :CH 4 ratios

“…Deactivation by SO 2 or H 2 S are usually not treated separately [20], since under typical reaction conditions of methane combustion (T > 350 °C, oxygen excess) hydrogen sulfide is oxidized to SO 2 [21].…”

Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

“…The low concentration of methane [1,3] and a negative effect of water [10][11][12][13][14][15][16][17][18] are * Corresponding author. Tel.…”