Effect of Sn on the adsorption of H2 and the production of methanol during syngas conversion over Co/alumina. - Université Claude Bernard Lyon 1 Accéder directement au contenu
Communication Dans Un Congrès Année : 2019

Effect of Sn on the adsorption of H2 and the production of methanol during syngas conversion over Co/alumina.

A. Paredes-Nunez
  • Fonction : Auteur
D. Lorito
  • Fonction : Auteur

Résumé

Hydrocarbons are the main reaction products of syngas conversion over cobalt-based catalysts. Methanol is also produced as a minor by-product and has been proposed to be produced via a specific reaction pathway involving formates species located at the interface with the support [1]. The poisoning of a Co/alumina catalyst with Sn was studied here and a stronger decline in methanol production was observed at higher Sn/Co ratios, similarly to the case of hydrocarbons reported earlier [2] . The addition of Sn did not prevent the formation of formates as observed by operando diffuse reflectance FT-IR spectroscopy. The reactivity of these formates measured during a chemical transient was yet markedly lowered in the presence of Sn. In addition, the presence of tin dramatically reduced the adsorption of H2 onto the catalyst. These observations can be rationalized according to the following model. Firstly, Sn poisoned sites on the cobalt nanoparticles, hindering H2 adsorption and activation, thereby limiting the subsequent hydrogenation of formates to methanol. Secondly, Sn addition could also have specifically poisoned interfacial sites, where the most reactive formates were present. These observations provide a wider understanding of the various hydrogenation pathways of CO taking place over cobalt-based catalysts. Reference: [1] D. Lorito, A. Paredes-Nunez, C. Mirodatos, Y. Schuurman, F.C. Meunier, Catal. Today, 259 (2015) 192–196. [2] A. Paredes-Nunez, D. Lorito, L. Burel, D. Motta-Meira, G. Agostini, N. Guilhaume, Y. Schuurman, F.C. Meunier, Ang. Chem. Int. Ed. 57 (2018) 547-550.
Fichier non déposé

Dates et versions

hal-02158396 , version 1 (18-06-2019)

Identifiants

  • HAL Id : hal-02158396 , version 1

Citer

Frédéric Meunier, A. Paredes-Nunez, D. Lorito, N. Guilhaume, Y. Schuurman. Effect of Sn on the adsorption of H2 and the production of methanol during syngas conversion over Co/alumina.. FCCAT 2019, Jun 2019, Fréjus, France. ⟨hal-02158396⟩
59 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More