Spray-Dried Sodium Zirconate: A Rapid Absorption Powder for CO(2) Capture with Enhanced Cyclic Stability.
Spray-Dried Sodium Zirconate: A Rapid Absorption Powder for CO(2) Capture with Enhanced Cyclic Stability.
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DOI：
10.1002/cssc.201700046
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发表时间：
2017-05-09
期刊：
影响因子：
8.4
通讯作者：
Milne SJ
中科院分区：
文献类型：
--
作者：
Bamiduro F;Ji G;Brown AP;Dupont VA;Zhao M;Milne SJ
在高温下捕获CO2的改进粉末需要用于使用吸附增强蒸汽重整的H2生产。在这里，我们研究了两种类型的Na 2 ZrO 3粉末的颗粒结构和碳酸化速率之间的关系。壁厚为100-300 nm的中空喷雾干燥微粒（对应于主要乙酸盐衍生颗粒的尺寸）在暴露于15 vol % CO2的工艺相关5 min后产生约75 wt %的理论CO2转化率。 通过固态反应制备的常规粉末碳酸化更慢，由于更大比例的反应需要通过致密团聚的颗粒进行本体扩散，仅实现50%的转化率。喷雾干燥粉末的中空颗粒结构在碳酸化后得以保留，但化学偏析导致结晶ZrO 2颗粒基质内的无定形富Na相（Na 2CO 3）的岛。尽管存在这种相分离，但可以通过在N2中将每种粉末加热至900 °C（无停留时间）来实现重新形成Na 2 ZrO 3的逆反应。这导致在40次循环测试中使用热重分析两种粉末的非常稳定的多晶性能。 热重数据的动力学分析表明，碳酸化过程符合Avrami-Erofeyev二维成核和核生长模型，与表面驱动转变的微观结构证据一致。因此，我们证明喷雾干燥是一种可行的工艺路线，以提高碳捕获性能的Na 2 ZrO 3粉末。
Improved powders for capturing CO2 at high temperatures are required for H2 production using sorption‐enhanced steam reforming. Here, we examine the relationship between particle structure and carbonation rate for two types of Na2ZrO3 powders. Hollow spray‐dried microgranules with a wall thickness of 100–300 nm corresponding to the dimensions of the primary acetate‐derived particles gave about 75 wt % theoretical CO2 conversion after a process‐relevant 5 min exposure to 15 vol % CO2. A conventional powder prepared by solid‐state reaction carbonated more slowly, achieving only 50 % conversion owing to a greater proportion of the reaction requiring bulk diffusion through the densely agglomerated particles. The hollow granular structure of the spray‐dried powder was retained postcarbonation but chemical segregation resulted in islands of an amorphous Na‐rich phase (Na2CO3) within a crystalline ZrO2 particle matrix. Despite this phase separation, the reverse reaction to re‐form Na2ZrO3 could be achieved by heating each powder to 900 °C in N2 (no dwell time). This resulted in a very stable multicycle performance in 40 cycle tests using thermogravimetric analysis for both powders. Kinetic analysis of thermogravimetric data showed the carbonation process fits an Avrami–Erofeyev 2 D nucleation and nuclei growth model, consistent with microstructural evidence of a surface‐driven transformation. Thus, we demonstrate that spray drying is a viable processing route to enhance the carbon capture performance of Na2ZrO3 powder.
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影响因子：
3.7
作者：
Koirala, Rajesh;Gunugunuri, Krishna R.;Smirniotis, Panagiotis G.
通讯作者：
Smirniotis, Panagiotis G.
影响因子：
11.4
作者：
Manovic, Vasilije;Anthony, Edward J.
通讯作者：
Anthony, Edward J.
影响因子：
3.7
作者：
Alcerreca-Corte, Itzel;Fregoso-Israel, Esteban;Pfeiffer, Heriberto
通讯作者：
Pfeiffer, Heriberto
影响因子：
15.1
作者：
Ji, Guozhao;Memon, Muhammad Zaki;Zhao, Ming
通讯作者：
Zhao, Ming
影响因子：
5.3
作者：
MacKenzie, A.;Granatstein, D. L.;Abanades, J. C.
通讯作者：
Abanades, J. C.