Biomass Processing Laboratory, Centre of Biofuel and Biochemical Research, Institute of Sustainable Living, Chemical Engineering Department, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak, Malaysia.
International Research Organization for Advance Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-855, Japan.
Environ Sci Pollut Res Int. 2019 Nov;26(33):33882-33896. doi: 10.1007/s11356-018-2549-2. Epub 2018 Jun 28.
The CO capture capacity and cyclic stability of calcium oxide (CaO) prepared from cockle shells (CS) were enhanced by incorporating rice husk (RH) and binder through wet-mixing method. The cyclic reaction of calcination and carbonation was demonstrated using thermal gravimetric analyzer (TGA) which the calcination was performed in a pure N environment at 850 °C for 20 min and carbonation at 650 °C for 30 min in 20 vol% of CO in N. The analysis using x-ray fluorescence (XRF) identified silica (Si) as the major elements in the sorbents. The RH-added sorbents also contained several types of metal elements such as which was a key factor to minimize the sintering of the sorbent during the cyclic reaction and contributed to higher CO capture capacity. The presence of various morphologies also associated with the improvement of the synthesized sorbents performance. The highest initial CO capture capacity was exhibited by CS+10%RH sorbent, which was 12% higher than the RH-free sorbent (CS). However, sorbents with the higher RH loading amount such as 40 and 50 wt% were preferred to maintain high capture capacity when the sorbents were regenerated and extended to the cyclic reaction. The sorbents also demonstrated the lowest average sorption decay, which suggested the most stable sorbent for cyclic-reaction. Once regenerated, the capture capacity of the RH-added sorbent was further increased by 12% when clay was added into the sorbent. Overall, the metal elements in RH and clay were possibly the key factor that enhances the performance of CaO prepared from CS, particularly for cyclic CO capture. Graphical abstract Cyclic calcination and carbonation reaction.
利用贝壳（CS）制备的氧化钙（CaO），通过湿混法掺入稻壳（RH）和粘结剂，提高了其 CO 捕集能力和循环稳定性。采用热重分析仪（TGA）对煅烧和碳酸化的循环反应进行了证明，煅烧在纯 N 环境中于 850°C 进行 20min，碳酸化在 650°C 于 20vol%CO 的 N 中进行 30min。X 射线荧光（XRF）分析表明，硅（Si）是吸附剂中的主要元素。添加 RH 的吸附剂还含有几种类型的金属元素，其中镁（Mg）是在循环反应中最小化吸附剂烧结的关键因素，并有助于提高 CO 捕集能力。各种形态的存在也与合成吸附剂性能的提高有关。CS+10%RH 吸附剂表现出最高的初始 CO 捕集容量，比无 RH 吸附剂（CS）高 12%。然而，当吸附剂再生并扩展到循环反应时，更高 RH 负载量（如 40 和 50wt%）的吸附剂更有利于保持高捕集容量。吸附剂还表现出最低的平均吸附衰减，这表明其在循环反应中是最稳定的吸附剂。一旦再生，添加粘土到吸附剂中时，添加 RH 的吸附剂的捕集能力进一步提高了 12%。总的来说，RH 和粘土中的金属元素可能是提高 CS 制备的 CaO 性能的关键因素，特别是在循环 CO 捕集方面。
