Application of engineered natural ores to intermediate‐ and high‐temperature CO2 capture and conversion

Abstract

AbstractIntegrated CO2 capture and conversion (ICCC) is a promising technology aiming at converting waste CO2 to fuels and high value‐added chemicals. Herein, we described a proof‐of‐concept study of applying engineered natural ores (dolomite, magnesite, and limestone) to two different ICCC processes—intermediate‐temperature ICCC for CH4 production (350–400°C) and high‐temperature ICCC for syngas production (650–700°C). In the former process, a MgO‐based CO2 sorbent prepared from dolomite and magnesite was combined with a methanation catalyst in a dual‐bed configuration, whereby a CH4 yield of 7.1–7.3 mmol/g can be stably achieved per cycle over 20 consecutive ICCC cycles. In the latter process, a CaO‐based sorbent derived from dolomite and limestone was coupled with a reforming catalyst also in a dual‐bed mode, whereby syngas with a H2/CO ratio of 0.9–1.0 can be produced over 20 cycles. This study will expand the application of natural ores in CO2 emission reduction.