Dry Reforming of Methane over a Ruthenium/Carbon Nanotube Catalyst

Abstract

In this study, CH4 dry reforming was demonstrated on a novel microwave-synthesized ruthenium (Ru)/carbon nanotube (CNT) catalyst. The catalyst was tested in an isothermal laboratory-packed bed reactor, with gas analysis by gas chromatography/thermal conductivity detection. The catalyst demonstrated excellent dry-reforming activity at modest temperatures (773–973 K) and pressure (3.03 × 105 Pa). Higher reaction temperatures favored increased conversion of CH4 and CO2, and increased H2/CO product ratios. Slight coke deposition, estimated by carbon balance, was observed at higher temperatures and higher feed CH4/CO2. A robust global kinetic model composed of three reversible reactions—dry reforming, reverse water gas shift, and CH4 decomposition—simulates observed outlet species concentrations and reactant conversions using this Ru/CNT catalyst over the temperature range of this study. This engineering kinetic model for the Ru/CNT catalyst predicts a somewhat higher selectivity and yield for H2, and less for CO, in comparison to previously published results for a similarly prepared Pt_Pd/CNT catalyst from our group.

Bimetallic Ni–Ru and Ni–Re Catalysts for Dry Reforming of Methane: Understanding the Synergies of the Selected Promoters

“…Few studies have been developed within the Re–Ni system; however, data suggest that Re addition could increase the chemisorbed H 2 , boost the Ni dispersion, and decreas the coke deposition on the catalyst’s surface ( Borowiecki et al, 2008 ; Daorattanachai et al, 2018 ; Wang, 2020 ; Xu et al, 2020 ). Ruthenium, on the other side, has been widely used at important industrial processes including hydrogenation, Fischer–Tropsch synthesis, ammonia synthesis, and steam reforming ( Baranowska and Okal, 2016 ; Zhu et al, 2020 ). It has been reported that Ru increases the stability and activity of the Ni/MgAl 2 O 4 catalyst in reforming reactions, but it is extremely sensitive to the synthesis method ( Crisafulli et al, 2002 ; Álvarez M et al, 2015 ).…”