Ru/Al2O3 on Polymer-Derived SiC Foams as Structured Catalysts for CO2 Methanation

Cepollaro, Elisabetta Maria; Cimino, Stefano; Lisi, Luciana; Biesuz, Mattia; Santhosh, Balanand; Sorarù, Gian Domenico

doi:10.3390/catal12090956

Open AccessArticle

Ru/Al₂O₃ on Polymer-Derived SiC Foams as Structured Catalysts for CO₂ Methanation

by

Elisabetta Maria Cepollaro

¹,

Stefano Cimino

^1,*

,

Luciana Lisi

¹

,

Mattia Biesuz

²

,

Balanand Santhosh

²

and

Gian Domenico Sorarù

^2,*

¹

Istituto di Scienze e Tecnologie per l’Energia e la Mobilità Sostenibili (STEMS), Consiglio Nazionale delle Ricerche (CNR), Via Guglielmo Marconi 4/10, 80125 Napoli, Italy

²

Dipartimento di Ingegneria Industriale, Università di Trento, Via Sommarive, 38123 Trento, Italy

^*

Authors to whom correspondence should be addressed.

Catalysts 2022, 12(9), 956; https://doi.org/10.3390/catal12090956

Submission received: 22 July 2022 / Revised: 17 August 2022 / Accepted: 23 August 2022 / Published: 28 August 2022

(This article belongs to the Special Issue Frontiers in Catalysis for CO₂ Methanation)

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Abstract

The catalytic methanation of CO₂ via the strongly exothermic equilibrium Sabatier reaction requires the development of structured catalysts with enhanced mass- and heat-transfer features to limit hot-spot formation, avoid catalyst deactivation, and control process selectivity. In this work, we investigated the use of polymer-derived SiC open-cell foams as structured carriers onto which γ-Al₂O₃ was applied by either dip-coating or pore-filling methods; eventually, Ru was dispersed by impregnation. The formation of an undesired insulating SiO₂ layer on the surface of the SiC struts was prevented by a pyrolysis treatment under an inert atmosphere at temperatures varying from 800 up to 1800 °C. SiC foam substrates and their corresponding structured catalysts were characterized by SEM, XRD, N₂ physisorption, and compressive strength measurements, and their CO₂ methanation activity was tested at atmospheric pressure in a fixed bed flow reactor operated in the temperature range from 200 to 450 °C. SiC foams obtained at intermediate pyrolysis temperatures (1000–1200 °C) showed good mechanical strength and high compatibility with the Ru/Al₂O₃ active catalytic overlayer.

Keywords: CO₂ utilization; hydrogenation; structured catalysts; polymer-derived ceramics; open-cell foams; SiC; Ruthenium

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MDPI and ACS Style

Cepollaro, E.M.; Cimino, S.; Lisi, L.; Biesuz, M.; Santhosh, B.; Sorarù, G.D. Ru/Al₂O₃ on Polymer-Derived SiC Foams as Structured Catalysts for CO₂ Methanation. Catalysts 2022, 12, 956. https://doi.org/10.3390/catal12090956

AMA Style

Cepollaro EM, Cimino S, Lisi L, Biesuz M, Santhosh B, Sorarù GD. Ru/Al₂O₃ on Polymer-Derived SiC Foams as Structured Catalysts for CO₂ Methanation. Catalysts. 2022; 12(9):956. https://doi.org/10.3390/catal12090956

Chicago/Turabian Style

Cepollaro, Elisabetta Maria, Stefano Cimino, Luciana Lisi, Mattia Biesuz, Balanand Santhosh, and Gian Domenico Sorarù. 2022. "Ru/Al₂O₃ on Polymer-Derived SiC Foams as Structured Catalysts for CO₂ Methanation" Catalysts 12, no. 9: 956. https://doi.org/10.3390/catal12090956

APA Style

Cepollaro, E. M., Cimino, S., Lisi, L., Biesuz, M., Santhosh, B., & Sorarù, G. D. (2022). Ru/Al₂O₃ on Polymer-Derived SiC Foams as Structured Catalysts for CO₂ Methanation. Catalysts, 12(9), 956. https://doi.org/10.3390/catal12090956

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Ru/Al₂O₃ on Polymer-Derived SiC Foams as Structured Catalysts for CO₂ Methanation

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