Understanding the importance of N-doping for CNT-supported Ni catalysts for CO2 methanation

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Gonçalves, LPL (Author) Other; Meledina, M (Author) Other; Meledin, A (Author) Other; Petrovykh, DY (Author) Other; Sousa, JPS (Author) Other; O.S.G.P. Soares (Author) FEUP; Kolen'ko, YV (Author) Other; Manuel Fernando R Pereira (Author) FEUP

Journal

Title: Carbon

Vol. 195

Pages: 35-43

ISSN: 0008-6223

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 15 Citations

Other information

Authenticus ID: P-00W-FR0

DOI: 10.1016/j.carbon.2022.03.059

Abstract (EN): The N-doping of carbon nanotubes (CNTs) is widely accepted as an effective way to enhance the catalytic performance of CNT-supported Ni catalysts for CO2 methanation. To demonstrate, in a direct systematic comparison, the importance of N-doping for producing high-performance CO2 methanation catalysts, we developed two catalysts composed of 15 wt% Ni on pristine (Ni/CNT) and N-doped CNT (Ni/CNT-N) and correlated their catalytic performance with their properties. Compared to Ni/CNT, Ni/CNT-N achieved a higher X-CO2 of 81.2% with S-CH4 = 99.2% at a lower temperature of 400 C, exhibiting excellent stability over 48 h time-on-stream testing. Our comprehensive comparative study demonstrated that the N-doped CNT support featured a better distribution of the Ni sites that were strongly interacting with the support, even with atomically dispersed Ni being observed by HAADF-STEM. This higher dispersion, enabled by the anchoring sites provided by the N-doping, is one of the main reasons for the enhanced performance of Ni/CNT-N, because it increases the H2 uptake capacity.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9