The effect of citric acid on the catalytic activity of nano-sized MoS2 toward sulfur-resistant CO methanation

In this work, a facile hydrothermal route was used to prepare nano-sized MoS2 catalyst. The effect of citric acid during the MoS2 preparation process on the catalytic activity of sulfur-resistant CO methanation was investigated. It was found that citric acid played an adverse role on the catalytic activity of MoS2 toward sulfur-resistant CO methanation. However, CO methanation performance turned out to be better when NH2OH center dot HCl as a reductant was removed during the catalyst preparation process. The X-ray diffraction (XRD) and infrared spectroscopy (IR) were performed to discuss the possible mechanism for the effect of citric acid towards CO methanation performance.