Citation:
Lunbo Duan, Chenglin Su, Maria Erans, Yingjie Li, Edward J. Anthony and Huichao Chen. Industrial and Engineering Chemistry Research, 2016, Vol. 55, Issue 39, pp. 10294–10300
Abstract:
Synthetic biomass-templated cement-supported CaO-based sorbents were produced by granulation
process for high-temperature post-combustion CO2 capture. Commercial flour was used as the biomass
and served as a templating agent. The investigation of porosity showed that the pellets with biomass or
cement resulted in enhancement of porosity. Four types of sorbents containing varying proportions of
biomass and cement were subject to 20 cycles in a TGA under different calcination conditions. After
first series of tests calcined at 850 °C in 100% N2, all composite sorbents clearly exhibited higher CO2
capture activity compared to untreated limestone with exception of sorbents doped by seawater. The
biomass-templated cement-supported pellets exhibited the highest CO2 capture level of 46.5% relative
to 20.8% for raw limestone after 20 cycles. However, the observed enhancement in performance was
substantially reduced under 950 °C calcination condition. Considering the fact that both sorbents
supported by cement exhibited relatively high conversion with a maximum value of 19.5%, cement
promoted sorbents appear to be better at resisting of harsh calcination conditions. Although flour as
biomass-templated material generated significantly enhancement in CO2 capture capacity, further
exploration must be carried out to find the way of maintaining outstanding performance for CaO-based
sorbents under severe reaction conditions.