College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, People's Republic of China.
Environ Technol. 2022 Feb;43(5):673-683. doi: 10.1080/09593330.2020.1800105. Epub 2020 Aug 6.
The aim of this work is to prepare the nano-CaO-CaTiO adsorbents with both high CO sorption capacity and high durability. A series of nano-CaO-CaTiO adsorbents with different CaTiO grain sizes were prepared by the reaction between TiO and nano-CaO with variation of the preparation methods, doping contents and thermal pretreatment conditions. The results showed that the CaTiO grain size would decrease by adopting the adsorption phase reaction method, reducing the doping content as well as thermal pretreatment temperature and time properly. Moreover, smaller CaTiO grain size was favourable for increasing sorption capacity of the adsorbent, while larger CaTiO grain size was more helpful for improving the durability. Under the consideration of the benefit of both the sorption capacity and the durability of adsorbents, the optimal CaTiO grain size was got as 23.5 nm and its sorption capacity remained 8.52 mol/kg at the 50th cycle under the actual severe regeneration condition.
本工作旨在制备兼具高 CO 吸附容量和高耐久性的纳米 CaO-CaTiO 吸附剂。通过 TiO2 和纳米 CaO 之间的反应，采用不同的制备方法、掺杂含量和热预处理条件，制备了一系列具有不同 CaTiO 晶粒尺寸的纳米 CaO-CaTiO 吸附剂。结果表明，采用吸附相反应法、适当降低掺杂含量以及热预处理温度和时间，可以降低 CaTiO 晶粒尺寸。此外，较小的 CaTiO 晶粒尺寸有利于提高吸附剂的吸附容量，而较大的 CaTiO 晶粒尺寸更有助于提高耐久性。在考虑吸附剂的吸附容量和耐久性的双重收益的情况下，在实际苛刻的再生条件下，最佳的 CaTiO 晶粒尺寸为 23.5nm，第 50 次循环时的吸附容量仍保持在 8.52mol/kg。
