Title :

Effect of rh in ni-based catalysts on sulfur impurities during methane reforming

Author(s) :

Theofanidis, Stavros-Alexandros [Auteur]
Pieterse, Johannis A. Z. [Auteur]
Poelman, Hilde [Auteur]
Longo, Alessandro [Auteur]
Sabbe, Maarten K. [Auteur]
Virginie, Mirella [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Detavernier, Christophe [Auteur]
Marin, Guy B. [Auteur]
Galvita, Vladimir V. [Auteur]

Journal title :

Applied catalysis. B, Environmental

Abbreviated title :

Appl. Catal. B-Environ.

Volume number :

267

Pages :

118691

Publication date :

2020-06-15

ISSN :

0926-3373

Keyword(s) :

H2S
Syngas production
Sulfur poisoning
Ni-Rh alloy
Biomass gasifier

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

The addition of Rh, in low concentrations (<1 wt%), to Ni-based catalysts was investigated during steam-dry reforming of a gas mixture, which simulates the effluent of a biomass gasifier, after removal of tar compounds, ...
Show more >The addition of Rh, in low concentrations (<1 wt%), to Ni-based catalysts was investigated during steam-dry reforming of a gas mixture, which simulates the effluent of a biomass gasifier, after removal of tar compounds, but in presence of H2S at ppm level. Four Ni-Rh catalysts supported on MgAl2O4, with Ni:Rh molar ratio varying from 18 to 82, were characterized using N2-BET, Inductively Coupled Plasma Atomic Emission Spectroscopy and X-ray Diffraction, while the evolution of the catalyst structure during temperature program reduction and oxidation was examined using time-resolved in-situ XRD. During reduction of the Ni-Rh catalyst, two types of Ni-Rh alloy were formed. The Rh-rich Ni alloy remained stable up to 1123 K under CO2 oxidation. The catalyst with a Ni:Rh molar ratio of 41 showed the best performance in terms of both activity and stability, in presence of 7 ppm H2S as a contaminant, at 1173 K and total pressure of 111.3 kPa, reaching 0.24 molCH4·s−1 ·kgmetals−1 after 42.5 h time-on-stream. Regeneration of the catalysts was performed by removing H2S from the feed stream. The catalyst regeneration ability depended on the formation of a Ni-Rh alloy and hence on the Ni:Rh molar ratio. According to density functional theory calculations on the adsorption and dissociation of H2S on Ni and NiRh (111) surfaces, the Ni-Rh alloy inhibited H2S decomposition in contrast to monometallic Ni.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Catalyse pour l’énergie et la synthèse de molécules plateforme (CEMOP)

Submission date :

2022-03-02T07:14:26Z
2023-11-27T13:53:58Z
2024-04-19T07:24:59Z