Tuning CO2 hydrogenation selectivity on Ni/TiO2 catalysts via sulfur addition

Carole Le Berre, Andrea Falqui, Alberto Casu, Tekalign T. Debela, Mathias Barreau, Christopher H. Hendon, Philippe Serp

Research output: Contribution to journalArticlepeer-review

Abstract

In the context of CO2 valorization, the possibility of shifting the selectivity of Ni catalysts from CO2 methanation to reverse water gas shift reaction could be economically attractive provided that the catalyst presents sufficient activity and stability. Remarkably, the addition of sulfur (0.2–0.8% w/w) to nickel on a Ni/TiO2 catalyst induces a complete shift in the catalyst selectivity for CO2 hydrogenation at 340 °C from 99.7% CH4 to 99.7% CO. At an optimal Ni/S atomic ratio of 4.5, the productivity of the catalyst reaches 40.5 molCO2 molNi−1 h−1 with a good stability. Density functional theory (DFT) calculations performed on various Ni surfaces reveal that the key descriptor of selectivity is the binding energy of the CO intermediate, which is related to the local electron density of surface Ni sites.
Original languageEnglish (US)
JournalCatalysis Science & Technology
DOIs
StatePublished - Oct 11 2022

Bibliographical note

KAUST Repository Item: Exported on 2022-10-19
Acknowledgements: This work was financially supported by “Région Occitanie” through a Readynov contract “Valorisation du CO2 par méthanation catalytique” (2005314). Thanks to Marion Technologies for the scale-up of catalysts synthesized. TD and CHH are supported by the National Science Foundation through the Division of Materials Research under grant no. DMR-1956403 and the Camille and Henry Dreyfus Foundation. Computations were performed in the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by the National Science Foundation [ACI-1548562] and the PICS Coeus High Performance Computer, which is supported by the National Science Foundation [1624776]. The authors acknowledge Dr. Spiros Zafeiratos (ICPEES-UMR 7515 CNRS-ECPM-Strasbourg University, France) for access to XPS.

ASJC Scopus subject areas

  • Catalysis

Fingerprint

Dive into the research topics of 'Tuning CO2 hydrogenation selectivity on Ni/TiO2 catalysts via sulfur addition'. Together they form a unique fingerprint.

Cite this