Work

Origin of the High Performance of GaZrOx/SAPO‐34 Bifunctional OXZEO Catalyst for the Methanol‐Mediated CO Hydrogenation to Light Olefins

Year: 2025

Type: article

Abstract: Gallium‐based catalysts have recently gained strong interest for (de)hydrogenation reactions. In this work, we evaluated GaZr mixed oxides associated with SAPO‐34 for the methanol‐mediated syngas conversion to light olefins and confirmed high performance of the mixture. A fundamental approach based on H2‐TPD and in situ DRIFTS techniques were followed to decipher the origin of its high performance and provide insights on the still debated redox mechanism of CO hydrogenation to methanol. A pronounced lability and easy regeneration of OH groups on GaZr oxides were shown to facilitate CO conversion to HCOO* intermediate. Concomitantly, surface reduction under hydrogen leads to formation of oxygen vacancies favoring H2 dissociation and formation of highly reactive Ga‐H hydrides which further readily hydrogenate HCOO* intermediate to CH3O*. The particular property of GaZr oxides making them an optimal component for OXZEO process is its low activity for olefins hydrogenation combined with high ability to generate methanol intermediate.

Source: ChemCatChem

DOI: 10.1002/cctc.202401995

Authors: Antoine Salichon, Ruben Checa, Pavel Afanasiev, Stéphane Loridant

Institutions: Lyon 1 Université, Centre National de la Recherche Scientifique, Institut de Recherches sur la Catalyse et l'Environnement de Lyon

Language: English

Topic: Catalysts for Methane Reforming

Subfield: Catalysis

Field: Chemical Engineering

Domain: Physical Sciences

Open Access status: green

Funder: Agence Nationale de la Recherche

Award: oxide-zeotype bifunctional catalysts efficient for the conversion of CO and CO2 to light olefins