Scalable synthesis of the lithium silicate-based high-temperature CO2 sorbent from inexpensive raw material vermiculite
Scalable synthesis of the lithium silicate-based high-temperature CO2 sorbent from inexpensive raw material vermiculite
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利用廉价原料蛭石大规模合成硅酸锂基高温二氧化碳吸附剂
DOI：
10.1016/j.cej.2018.05.113
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发表时间：
2018-10
影响因子：
15.1
通讯作者：
Wang Qiang
中科院分区：
文献类型：
--
作者：
Zhang Yu;Yu Feng;Louis Benoit;Wang Qiang
首次以膨胀蛭石（EXVMT）为原料制备了新型Li 4SiO 4基高温CO2吸收剂。由于EXVMT中存在的杂质相的分离作用，这种新型CO2吸附剂Li 4SiO 4-（EXVMT）-4具有更好的Li 4SiO 4纳米颗粒分散性和更高的孔隙率，从而大大提高了CO2的吸附/解吸循环稳定性。元素分析表明，Li 4SiO 4与其它共存相均匀分散，XRD分析表明，Li 4SiO 4-（EXVMT）-4中Li 4SiO 4的晶粒尺寸在10次循环后基本保持不变。此外，该吸附剂在较低的吸附温度（550 °C）下表现出更高的CO2吸附容量和更快的吸附速率。我们还表明，这种吸附剂具有较低的活化能的化学吸附和扩散过程，使其能够受到CO2浓度的影响要小得多。通过将CO2浓度从100体积%降低到20体积%，Li 4SiO 4-（EXVMT）-4的CO2吸附容量仅从19.4重量%略微降低到18.6重量%，但由纯SiO2合成的Li 4SiO 4的容量从22.0重量%显著降低到11.3重量%。由于其高的CO2吸附容量，优异的循环稳定性，快速的吸附速率，低成本，和可扩展的合成，VMT衍生的Li 4SiO 4基高温CO2吸附剂是非常有前途的实际应用。
A novel Li4SiO4-based high-temperature CO2sorbent was prepared directly from the expanded vermiculite (EXVMT) for the first time. Due to the separating effect by the existing impurity phases in EXVMT, this new CO2sorbent Li4SiO4-(EXVMT)-4 possesses better dispersion of Li4SiO4nanoparticles and higher porosity, which resulted in a much enhanced CO2sorption/desorption cycling stability. Elemental mapping revealed the homogeneous dispersion of Li4SiO4with the other co-existing phases and XRD analyses indicates the crystal size of Li4SiO4in Li4SiO4-(EXVMT)-4 kept almost unchanged even after 10 cycles. In addition, this sorbent exhibited much higher CO2sorption capacity and faster sorption rate at relatively lower sorption temperature (550 °C). We also demonstrated that this sorbent possesses lower activation energies for both the chemisorption and the diffusion processes, enabling it to be much less affected by CO2concentration. By decreasing the CO2concentration from 100 to 20 vol%, the CO2sorption capacity of Li4SiO4-(EXVMT)-4 only slightly decreased from 19.4 to 18.6 wt%, but the capacity for Li4SiO4synthesized from pure SiO2decreased significantly from 22.0 to 11.3 wt%. Thanks to its high CO2sorption capacity, excellent cycling stability, fast sorption rate, low cost, and scalable synthesis, the VMT derived Li4SiO4-based high-temperature CO2sorbent is very promising for practical applications.
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二钛酸钾具有意想不到的高度可逆拓扑 CO2 吸附/解吸能力
影响因子：
11.9
作者：
Zheng Qianwen;Huang Liang;Zhang Yu;Wang Junya;Zhao Chen Zi;Zhang Qiang;Zheng Weijie;Cao Dapeng;O'Hare Dermot;Wang Qiang
通讯作者：
Wang Qiang
用于高温 CO2 捕集的新型硅藻土 Li4SiO4 基吸附剂
影响因子：
5.2
作者：
Shan SY;Jia QM;Jiang LH;Wang YM;Peng JH
通讯作者：
Peng JH
提高纳米稻壳灰中 Li4SiO4 基吸附剂的反应活性，用于高温 CO2 捕获
影响因子：
10.4
作者：
Guo, Xin;Li, Yimin;Han, Dongtai;Chao, Yang
通讯作者：
Chao, Yang
影响因子：
11.2
作者：
Shiyi Chen;Wenguo Xiang;Dong Wang;Zhipeng Xue
通讯作者：
Shiyi Chen;Wenguo Xiang;Dong Wang;Zhipeng Xue
影响因子：
8.4
作者：
Bamiduro F;Ji G;Brown AP;Dupont VA;Zhao M;Milne SJ
通讯作者：
Milne SJ