CO₂ Capture Performance Using Biomass-Templated Cement-Supported Limestone Pellets

Abstract

Synthetic biomass-templated cement-supported CaO-based sorbents were produced by granulation process for high-temperature post-combustion CO 2 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% N 2 , all composite sorbents clearly exhibited higher CO 2 capture activity compared to untreated limestone with exception of sorbents doped by seawater. The biomass-templated cement-supported pellets exhibited the highest CO 2 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 CO 2 capture capacity, further exploration must be carried out to find the way of maintaining outstanding performance for CaO-based sorbents under severe reaction conditions.

From waste to high value utilization of spent bleaching clay in synthesizing high-performance calcium-based sorbent for CO2 capture

“…6,32 The residual combustible components act as template materials and are considered to contribute to the increased porosity of pellets for the second peak, which is similar to the suggested role of biomass in previous work. 14,32 6; also presented is an image of the 20 th cycle. From Fig.…”

“…More details about this pelletization process can be found elsewhere. 14 After that, the pellets were air dried and then sieved to the desired size of 0.1-0.6 mm (see Fig. 2).…”

“…Cement, as a promising binder, has been investigated in many early studies. 6,14 Additionally, different SBC treatments are expected to result in diverse structural properties, which might cause variation in the capture ability for sorbents. Three regeneration methods were investigated in these tests, including pyrolysis, calcination in air and organic solvent extraction.…”

Synthesis of highly effective stabilized CaO sorbents via a sacrificial N-doped carbon nanosheet template

“…This poor cyclic stability is typically explained by sintering-induced significant loss of meso-porosity and surface area since the low Tammann temperature (T T ) of CaCO 3 (~529°C) is below typical operating temperatures for such a cycle (600-700°C for carbonation and 900-950°C for calcination). 20,21 To mitigate severe sintering, a number of thermal/chemical treatments, including hydration 22,23 , self-reactivation 24,25 , re-carbonation 26,27 , doping 28 , acidification 29,30 , and biomass templating [31][32][33][34] have been investigated to increase the porosity of raw CaO. Another approach is to stabilize the CaO structure by using high-T T stabilizers (i.e.…”

Mechanism of steam‐declined sulfation and steam‐enhanced carbonation by DFT calculations

“…Among them, calcium looping (CaL) technique is a promising postcombustion technology for carbon capture and storage, which is competitive since it is cost effective, resources abundant, and CO 2 uptake capacity is theoretically high (0.786 g·CO 2 /g·CaO) . However, the CO 2 uptake capacity of calcium‐based absorbents decreases with CaL cycles . On the one hand, the tail flue gas of coal combustion from power plant contains SO 2 , which would affect the carbonation performance.…”