Abstract
High Resolution Image Download MS PowerPoint Slide Dry reforming of methane (DRM) is a promising method to utilize two greenhouse gases, such as CH 4 and CO 2, to produce synthesis gas. In the current work, both monometallic Ni and bimetallic Ni–Fe catalysts with different Fe/Ni molar ratios, synthesized by solution combustion synthesis (SCS) in DRM, were investigated using a feed ratio of CH 4 /CO 2 /Ar of 1:1:1 at 600–900 °C. The catalysts were characterized by several physicochemical techniques such as X-ray diffraction (XRD), scanning electron microscopy energy-dispersive X-ray (SEM-EDX) spectroscopy, transmission electron microscopy (TEM), CHNS, N 2 physisorption, H 2 -TPR, O 2 -TPO, NH 3 -TPD, and thermogravimetric analysis (TGA). One of the highest hydrogen yields of 81% was obtained at 93% conversion of CH 4 and 94% conversion of CO 2 for the bimetallic 15Ni–5Fe–30Al catalyst, which contained, according to XRD, NiAl 2 O 4 spinel and metallic Ni phases. The spinel phase was decomposed during the reaction, while the Ni 3 Fe alloy was formed. Catalysts with a higher Fe/Ni ratio exhibited lower conversion and contained an inactive FeAl 2 O 4 spinel. Rather stable yields of CO and H 2 were obtained in an experiment with 20 h time-on-stream.