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Chemical Looping Dry Reforming as Novel, Intensified Process for CO 2 Activation

2012; Wiley; Volume: 35; Issue: 7 Linguagem: Inglês

10.1002/ceat.201100649

1521-4125

Shreyas Bhavsar, Margarita Juárez Nájera, Götz Veser,

Catalysts for Methane Reforming

Abstract Chemical looping dry reforming (CLDR) is a novel, intensified route for CO 2 activation. Two nanostructured carriers (Fe‐BHA and Fe@SiO 2 ) are synthesized, characterized, and evaluated with regard to activity and stability in thermogravimetric and fixed‐bed CLDR reactor studies over a temperature range of ~500–800 °C. Fe‐barium hexaaluminate (Fe‐BHA) shows fast redox kinetics and stable operation over multiple CLDR cycles, while Fe@SiO 2 exhibits poor activity for CO generation due to a partial loss of the core‐shell structure and formation of silicates. While the latter could be removed via a two‐step oxidation scheme, carrier utilization remained well below that of Fe‐BHA (~ 51 % versus ~ 15 %). However, the two‐step oxidation configuration turns the net endothermic CLDR process into a net exothermic process, opening up a highly efficient autothermal process alternative.