Biogas reforming of carbon dioxide to syngas production over Ni-Mg-Al catalysts

In this work, a series of Ni-Mg-Al catalysts with different Mg molar contents were prepared via a co-precipitation method. These catalysts were used for the biogas reforming of carbon dioxide (BRCD) for syngas production. The influence of Mg molar contents on the catalyst structure and catalytic performance was investigated. During the 60h stability test at 750 degrees C, all of the Mg-promoted catalysts presented a higher catalytic activity and better stability in comparison with the catalyst without Mg loading. The NM(10)A sample with 10 mol% Mg loading displayed the highest CH4 and CO2 conversion of 86.9% and 90.8%, respectively. The catalysts were characterized by N-2 adsorption-desorption analysis, XRD, H-2-TPR, CO2TPD, TEM and TGA techniques. It was found that the addition of Mg inhibited the sintering of Ni particle and increased the catalyst basicity. Consequently this suppressed the coke deposition and improved the catalytic activity. The NM10A catalyst possessed the most basic sites, which caused a minimum amount carbon to be deposited on the catalyst and allowed for the best catalytic activity. The obvious increase of the Ni metal size and the severe coke deposition resulted in the deactivation of the NM(0)A catalyst. (C) 2017 Elsevier B.V. All rights reserved.