Fixed Bed Reactor Validation of a Mayenite Based Combined Calcium–Copper Material for Hydrogen Production through Ca–Cu Looping
Peer reviewed, Journal article
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- Department of Chemistry 
For the first time, a mayenite based material combining calcium and copper (18.0/37.6/44.4 estimated active wt % CaO/CuO/Ca12Al14O33, CuO/CaO = 2.1 [wt/wt]) has been subjected to three full calcium–copper chemical looping combustion (Ca–Cu Looping) cycles in a fixed bed reactor (70.0 g of combined material and 3.5 g of 18.0 wt % Ni/Al2O3 reforming catalyst), demonstrating the feasibility of a combined materials approach to hydrogen production through Ca–Cu Looping. Combined materials were characterized by helium pycnometry, mercury intrusion, nitrogen adsorption, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and energy dispersive X-ray diffraction before and after reactor testing. A carbon dioxide capture capacity of 14.6–15.0 g CO2/100 g (640–660 °C, 1.0 MPa, 2.5 kgCH4 kgcat–1 h–1), full oxidation, and expected calcination efficiencies (51–64%) were obtained. Combined material performance is comparable to that of segregated materials previously tested in the same experimental rig. Process intensification of Ca–Cu Looping through combined materials development is promising.
Embargo until specific date: 15.07.2020