Acquiring an Efficient Warm-CO2 Sorbent from Advanced Pyrolysis of Magnesium Oxalate

Acquiring an Efficient Warm-CO2 Sorbent from Advanced Pyrolysis of Magnesium Oxalate
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通过草酸镁的高级热解获得高效的温二氧化碳吸附剂

DOI:
10.1002/cnma.201700183
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发表时间:
2017-11
期刊:
影响因子:
3.8
通讯作者:
Zhu Jian Hua
Zhu Jian Hua
中科院分区:
材料科学4区
文献类型:
--
作者:
Li Yan Yan;Sun Xiao Dan;Dong Xin Yu Ming;Wang Ying;Zhu Jian Hua

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第一次,Brunauer-Emmett-Teller(BET)表面积超过200 m2 g − 1的多孔MgO可以在没有任何溶剂或添加剂的情况下从普通草酸镁的热解中简单地获得。 所得多孔MgO具有278.5 m2 g − 1的大表面积,在473 K的瞬时吸附中捕获30.8 mg g− 1的CO2,与通过复杂程序制备的许多MgO基吸附剂相当。   使用U形管式炉沿着特定的氮气载气“全程”吹扫模式,可以以简单的方式制造这种高效的温CO2吸附剂。研究了前驱体盐与流动气体的接触方式、流动气体的流速、气体和盐的种类等因素对MgO样品孔结构和吸附特性的影响。MgO样品在473 K下除具有捕集CO2、SO2和NO的能力外,还具有较高的强碱位暴露率(70.5%),这为烟气中CO2的控制提供了一种有用的固体强碱。
For the first time, porous MgO with a Brunauer–Emmett–Teller (BET) surface area over 200 m2g−1can be simply obtained from pyrolysis of common magnesium oxalate without any solvent or additive. The obtained porous MgO had a large surface area of 278.5 m2g−1and captured 30.8 mg g−1of CO2in the instantaneous adsorption at 473 K, comparable with many MgO‐based sorbents prepared through complex procedures. Use of a U‐pipe furnace along with the specific “throughout” sweeping mode of nitrogen carrier gas enable this efficient warm‐CO2sorbent to be fabricated in a simple way. Factors including contacting modes between precursor salt and flowing gas, flow rate, type of gas and salt were carefully studied, and related to the pore structure and adsorption character of the MgO samples. Apart from the capability of trapping CO2mixed with SO2and NO at 473 K, the MgO sample showed a high ratio of exposed strong basic sites (70.5 %), which provides a useful solid strong base for control of CO2in flue gas.
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