Design of active and stable NiCeO2ZrO2MgAl2O4 dry reforming catalysts

An active and stable NiCeO2ZrO2MgAl2O4 catalyst for dry reforming in severe coking conditions (CO2/CH4 = 1.1, GHSV = 32,000 h−1, 670 °C and 1.5 bar) was developed by combining conventional and combinatorial research strategies using high-throughput experimentation. A D-optimal design was applied to setup statistically verified models for catalytic activity (XCH4,XCO2),(XCH4,XCO2), selectivity (H2/CO molar ratio) and stability (coke resistance) as function of the selected input factors, viz. the amount of active element and amount of promoters. The importance of selecting the proper objective function R and appropriate unit to express the amount of coke deposited are discussed in detail. Via the most reliable objective function R an optimal catalyst composition area is obtained, where catalysts combine high activity with a long service lifetime. It was recognized that stable dry reforming occurs only with a subtle balance of the catalyst composition. Best dry reforming performances are achieved with catalyst compositions having low Ni (2 wt%), ZrO2 (<1 wt%) and high CeO2 (>3 wt%) content.

. Active NiCeO2ZrO2MgAl2O4 catalysts are developed for dry reforming in severe coking conditions using a D-optimal design. Experimentally verified models (activity, selectivity, coke amounts) were used to predict optimal catalyst compositions.Figure optionsDownload as PowerPoint slideHighlights
► Discovery of new NiCeO2ZrO2MgAl2O4 catalyst compositions for stable dry reforming of methane in industrially relevant conditions.
► D-optimal design was used to model the catalytic performance (in terms of coke formation, selectivity and conversion) as function of the catalyst composition.
► Composition areas were predicted for stable and active reforming of methane with CO2 using a well-considered objective function.
► The importance of the selection of the proper objective function and unit for the amount of coke is emphasized.