Understanding the Role of Mono and Ternary Alkali Metal Salts on CO Uptake of MgO Sorbents.

CO uptake by MgO-based sorbents at intermediate temperatures is attractive for pre- and post-combustion CO capture applications. However, besides the high CO uptake potential of these materials (1.1 g CO g sorbent), in practice, the realistic CO capture is far from that of the theorical values.

Blending Wastes of Marble Powder and Dolomite Sorbents for Calcium-Looping CO Capture under Realistic Industrial Calcination Conditions.

The use of wastes of marble powder (WMP) and dolomite as sorbents for CO capture is extremely promising to make the Ca-looping (CaL) process a more sustainable and eco-friendly technology. For the downstream utilization of CO, it is more realistic to produce a concentrated CO stream in the calcination step of the CaL process, so more severe conditions are required in the calciner, such as an atmosphere with high concentration of CO (>70%), which implies higher calcination temperatures (>900 °C). In this work, experimental CaL tests were carried out in a fixed bed reactor using natural CaO-based sorbent precursors, such as WMP, dolomite and their blend, under mild (800 °C, N) and realistic (930 °C, 80% CO) calcination conditions, and the sorbents CO carrying capacity along the cycles was compared.