Kinetic Study of Dry Reforming of Methane Over Ni–Ce/Al2O3 Catalyst with Deactivation

Abstract

A kinetic study for dry reforming of methane over Ni-Ce/Al 2 O 3 catalyst was performed, taking into account both the main reactions and the catalyst deactivation. The catalyst was prepared by a sequential wet impregnation process, with loadings of 5 wt.% Ni and 10 wt.% Ce. Experimental tests were carried out in a fixed bed reactor between 475 and 550 °C and several spatial times, using nitrogen as diluent. Several kinetic equations were compared. The best fit of experimental data was achieved using a Langmuir-Hinshelwood mechanism which takes into account the presence of two active sites. Preexponential factor and activation energy were calculated. the kinetics of deactivation was also determined. The relationship between catalyst activity and coke concentration was also studied. Several deactivation equations were considered in order to choose the best fit with experimental data.

Mechanistic and multiscale aspects of thermo-catalytic CO2conversion to C1products

“…Different kinetic mechanisms for the dry reforming reaction have been published in the last few years. 224,[430][431][432][433][434][435] Only a few reports are present in the literature employing the Eley-Rideal (ER) model for DRM on Ni-based catalysts. 377 The Langmuir Hinshelwood-Hougen-Watson model (LHHW) has more extensive applications and reports in the literature.…”

Mechanistic in situ insights into the formation, structural and catalytic aspects of the La2NiO4 intermediate phase in the dry reforming of methane over Ni-based perovskite catalysts

“…Despite the obvious importance, further investigations on mechanistic details, as well as knowledge-driven catalyst development are highly needed, as most catalysts on noble metal basis (e.g., Pd or Ru) are either prohibitively expensive [2,[7][8][9][10] or susceptible to coke formation [1][2][3][4][5]. The latter is especially pronounced for the highly active Ni-based systems [11,12]. Nanoparticulate Ni systems are of particular interest, as they are reported to be more resistant against coke formation [13,14].…”

Parametric and Reaction Kinetic Study of Syngas Production from Dry Methane Reforming over Improved Nickel Catalysts

“…Several aspects of DRM have been considered in recent works, for instance, catalyst development, reaction kinetics, , mathematical modeling, , and plasma reforming . In the present work, two catalysts, Ni/MgO–Al 2 O 3 (or NMA) and Ni–Pt/Al 2 O 3 (or NPA), were chosen for an in-depth investigation on DRM between 773 and 1073 K. In a fixed-bed reactor, the effects of reaction parameters on syngas production were studied.…”