Monitoring the Reaction Mechanism in Model Biogas Reforming by In Situ Transient and Steady‐State DRIFTS Measurements

Abstract

In this work, the reforming of model biogas was investigated on a Rh/MgAl O catalyst. In situ transient and steady-state diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements were used to gain insight into the reaction mechanism involved in the activation of CH and CO . It was found that the reaction proceeds through of an initial pathway in which methane and CO are both dissociated on Rh metallic sites and additionally a bifunctional mechanism in which methane is activated on Rh sites and CO is activated on the basic sites of the support surface via a formate intermediate by H-assisted CO decomposition. Moreover, this plausible mechanism is able to explain why the observed apparent activation energy of CO is much lower than that of CH . Our results suggest that CO dissociation facilitates CH activation, because the oxygen-adsorbed species formed in the decomposition of CO are capable of reacting with the CH species derived from methane decomposition.

Sandwich‐Like Silica@Ni@Silica Multicore–Shell Catalyst for the Low‐Temperature Dry Reforming of Methane: Confinement Effect Against Carbon Formation

“…Furthermore, several peaks can be seen at =1400–1650 cm −1 , which are attributed commonly to carbonate species . Probably, adsorbed CO 2 reacts with surface −OH groups to form carbonate …”

Highly active and stable Ni dispersed on mesoporous CeO2-Al2O3 catalysts for production of syngas by dry reforming of methane

“…Its conversion to high value-added products, like syngas or pure hydrogen by reforming reactions is also of major interest since it consists in the conversion of two greenhouse gases in valuable products. Then, biogas reforming has been extensively studied by many authors in the last years [3][4][5].…”

Coking-resistant dry reforming of methane over Ni/γ-Al2O3 catalysts by rationally steering metal-support interaction

“…The mechanism schematic is given in Figure 5 summarized from the previous analysis. (Bobadilla et al, 2017). However, this process was blocked to a certain extent since interconversion between the carbonates at the same time.…”