Cs-promoted Ni/Fe catalyst as a Cr-free, high temperature shift catalyst for steam methane reformate without additional supply of steam

The goal of this study was to investigate the Cs-promoted Ni/Fe catalysts for high temperature shift reaction. The performance of all the catalysts was evaluated at 400 °C and 75,000 ml/gcat h under the reactant composition: 56.7% H2, 10% CO, 26.7% H2O, and 6.7% CO2, assuming gas production from the steam methane reformer at a H2O/CH4 ratio = 3 with 100% CH4 conversion and with no extra steam added for the protection of the catalyst. The Cs/Ni/Fe (Ni:Fe = 34:66; weight ratio) catalysts of 3.9–6.0 Cs wt.% showed excellent CO removal activities and suppressed the progress of methanation effectively. This performance was related to the increment of amount in weakly basic sites through Cs promotion.

Figure optionsDownload as PowerPoint slideHighlights
► Cs-promoted and unpromoted Ni/Fe catalysts were tested for HTS reactions.
► The reactant simulates the steam methane reformate assuming no additional steam.
► The Cs-promoted Ni/Fe catalyst demonstrated a high CO removal performance.
► Methanation was suppressed effectively by Cs promotion.
► The improved performance was attributed to the increase in amount of weakly basic sites.