Mineral carbonation of a desulfurization residue for CO₂ sequestration

Abstract

The feasibility of mineral carbonation of a desulfurization residue for sequestering CO 2 was evaluated both through theoretical and experimental approaches. The carbonation reaction, including carbonation of Ca(OH) 2 and CaSO 4 , occurred through a kinetically controlled stage with an activation energy of 20.21 kJ mol À1 . The concentration of ammonia, CO 2 flow rate, liquid to solid ratio and temperature impacted on the carbonation ratio of the desulfurization residue through their direct and definite influence on the rate constant. Concentration of ammonia and liquid to solid ratio were the most important factors influencing the desulfurization residue carbonation in terms of both the carbonation ratio and reaction rate. Under optimized conditions the carbonation ratio could reach approximately 98% when using industry-grade CO 2 . The crystalline phases of the carbonated desulfurization residue were calcite and vaterite with spherical and granular morphology. CO 2 /O 2 /N 2 mixed gas was also used as the simulated desulfurization fuel gas in the carbonation reaction and it had a relatively minor effect on the carbonation ratio. However, it slowed the carbonation reaction and produced a carbonation product with a smaller average particle size, which included high purity ($99%) white calcite. The carbonated desulfurization residue reported herein showed a rapid CO 2 sequestration ratio, high CO 2 sequestration amount, low cost, and a large potential for in situ CO 2 sequestration in the electricity and steel industry.

High Efficiency and Eco-Friendly TEPA-Functionalized Adsorbent with Enhanced Porosity for CO2 Capture

“…Also the reduction in the newly created pores and the replacement of TEPA on the outer nanotube surface, instead of their inner surface, proposed an increase in the average pore size. From Figure b it can be seen that the nanocomposite pore size is concentrated in the range of 2–10 nm. , …”

“…From Figure 6b it can be seen that the nanocomposite pore size is concentrated in the range of 2−10 nm. 41,42 In addition, a comparison of CO 2 adsorption studies with the current work was presented in Table 2. At the top of the table, a variety TEPA/PEI-based adsorbents were shown whose synthesis process is often costly and complex.…”

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

“…To improve the properties of MMT, the pillaring process is often performed, which involves exchanging the interlayer cations with organic or inorganic cations. Various mineral composite materials are used widely in catalysis, energy storage, and wastewater treatment together with supporting minerals such as kaolinite [26][27][28], halloysite [29][30][31][32][33][34], attapulgite [35][36][37], talc [38], expanded perlite [39], and tailings [40][41][42]. MoS 2 and most MoS 2 composites are hydrophobic and cannot be dispersed in water.…”

High CO2 Adsorption on Amine-Functionalized Improved Mesoporous Silica Nanotube as an Eco-Friendly Nanocomposite

“…The choices of most researchers for support materials in preparation of CO 2 adsorbents have been metal–organic frameworks (MOFs), , mesoporous carbon, resins, mesoporous silica, aerogel, macroporous silica, MCM-41, , TiO, and SBA-15. , Research has shown that clays, due to the presence of several clay minerals and some impurities in their structure, − and on the other hand, due to having features such as low cost, high mechanical stability, and high chemical stability, can be used in more advanced applications and in the role of supporting materials in solid base adsorbents by changing and improving the structure. ,, In the application of nanoclays as effective adsorbents, Pham et al studied the increase of CO 2 adsorption using nanozeolite synthesis. The results showed a very high concentration of nanozeolite at ambient temperature, and adsorption capacity dropped by 6.33% after 10 regeneration cycles.…”