Coke-resistance over Rh-Ni bimetallic catalyst for low temperature dry reforming of methane

Methane and carbon dioxide can be converted into syngas using the prospective dry reforming of methane technology. Carbon deposition is a major cause of catalyst deacti-vation in this reaction, especially at low temperature. The superior stability of bimetallic catalysts has made their development more and more appealing. Herein, a series of bimetallic RhNi supported on MgAl2O4 catalysts were synthesized and used for low tem-perature biogas dry reforming. The results demonstrate that the bimetallic RhNi catalyst can convert CH4 and CO2 by up to 43% and 52% over at low reaction temperature (600 degrees C). Moreover, the reaction rate of CH4 and CO2 of RhNi-MgAl2O4 remains stable during the 20 h long time stability test, most importantly, there was no obviously carbon deposition observed over the spent catalyst. The enhanced coking resistance should be attributed to the addition of a little amount of noble metal Rh can efficiently suppress dissociation of CHX* species into carbon, and the high surface areas of MgAl2O4 support can also promote the adsorption and activation of carbon dioxide to generate more O* species. Balancing the rate of methane dissociation and carbon dioxide activation to inhibit the development of carbon deposition is a good strategy, which provides a guidance for design other high performance dry reforming of methane catalysts.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.