Steam methane reforming on LaNiO ₃ perovskite‐type oxide for syngas production, activity tests, and kinetic modeling

Abstract

The kinetic experiments at various working conditions (ie, temperature: 500 C-900 C, pressure: 1-15 bar, H 2 O/CH 4 ratio [S/C ratio] of 1-2.5, and gas hourly space velocity of 900-1700 1/h) in the presence of LaNiO 3 perovskitetype oxide were done to consider and assess the outcome of steam methane reforming (SMR) and to build up its kinetic models depending on Langmuir-Hinshelwood method in a fixed bed reactor. The outcomes demonstrate, the methane conversion, H 2 and CO yields and formed CO 2 are affected by the working parameters. Elevated temperature is profitable for more methane conversion, H 2 and CO yield. While high temperature has a negative effect on mol % of CO 2 in outlet products. The high working pressure will not profit SMR respect to CH 4 conversion and products distribution. The efficacy of S/C ratio on the CH 4 conversion and CO yield depended on temperature range. H 2 yield considerably diminishes with an increment in S/C ratio, while the trend was reverse for CO 2 value in outlet gas. The accuracy of suggested kinetic model was evaluated by correlation and statistical tests. Outcomes exhibited that the obtained data were well anticipated through the suggested model, owning to presumption of nonideal gas phase and by utilizing reasonable equation of state of PPR78. K E Y W O R D S CH 4 conversion, H 2 and CO yields, kinetic model, LaNiO 3 perovskite-type oxide, steam methane reforming

Enhanced selectivity of syngas in partial oxidation of methane: A new route for promising Ni‐alumina catalysts derived from Ni/ γ‐AlOOH with modified Ni dispersion

“…To date, steam reforming is the most commercially applied technology for methane to syngas conversion. However, steam reforming is a costly endothermic process that requires high temperatures (>850°C) for efficient conversion 1,2 . Therefore, alternative conversion routes of natural gas are being widely explored aiming at more cost‐effective and commercially applicable technologies.…”

Stability and activity maintenance of Ni catalysts supported on La‐, Ce‐, and Mg‐promoted Al 2 O 3 and ZrO 2 for H 2 production from steam reforming of glycerol

“…Therefore, considerable research has focused on screening suitable supports and promoters for Ni or modifying the catalyst preparation method, trying to overcome these obstacles. Studied carriers for active Ni mainly include single metal oxide such as Al 2 O 3, 6‐11 ZrO 2, 4,8,12 La 2 O 3, 13 CeO 2, 10,14,15 MgO, 8 CaO, 16 SiO 2, 8,10,17 composite oxides such as CeO 2 ‐Al 2 O 3, 18‐23 La 2 O 3 ‐Al 2 O 3, 6,24‐26 MgO‐Al 2 O 3, 27‐31 CaO‐Al 2 O 3, 32 La 2 O 3 ‐ZrO 2, 33,34 CeO 2 ‐ZrO 2, 35‐38 CeO 2 ‐La 2 O 3 ‐Al 2 O 3, 39 and carbon material such as CNT, 30,40,41 activated biochar, 42 and graphene oxide 43,44 . Al 2 O 3 ‐supported Ni catalysts have received the most extensive study as stated above because the porous γ‐Al 2 O 3 with high surface area is very beneficial to form highly dispersed Ni crystals over the catalyst surface, thus achieving a high level of activity for SR reaction 8,10 .…”

Combined steam and dry reforming of methanol over Fe‐Mn‐Cu / ZrO 2 catalyst to syngas formation: Study about kinetic and fuzzy model approaches

“…Based on the species involved in the CSDRM process, the equation of state (EoS) of PC-SAFT could be applied well to evaluate the behavior of phase equilibrium. [42][43][44][45][46] Thereby, it was used to precisely calculate the VLE state in our study. The pure components parameters and binary interactions for the mixture including carbon monoxide, formic acid, hydrogen, methanol, steam and carbon dioxide were achieved by the literature.…”

“…The pure components parameters and binary interactions for the mixture including carbon monoxide, formic acid, hydrogen, methanol, steam and carbon dioxide were achieved by the literature. [42][43][44][45][46]…”

“…The kinetic model parameters of CSDRM, MD and WGS reactions included the rate constants and equilibrium constants. Arrhenius equation (Equation 38) was used to illustrate the relation of the reaction rate constant to process temperature [45][46][47][48] :…”