Lanthanum induced lattice strain improves hydrogen sulfide capacities of copper oxide adsorbents
Lanthanum induced lattice strain improves hydrogen sulfide capacities of copper oxide adsorbents
复制标题
镧引起的晶格应变提高了氧化铜吸附剂的硫化氢容量
DOI：
10.1002/aic.17484
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Simonetti, Dante A.
中科院分区：
文献类型：
--
作者：
Canning, Griffin A.;Azzam, Sara A.;Hoffman, Adam S.;Boubnov, Alexey;Alshafei, Faisal H.;Ghosh, Richa;Ko, Brian;Datye, Abhaya;Bare, Simon R.;Simonetti, Dante A.
这项工作探讨了La对涉及CuO吸附剂和气体流中的H2S的反应的影响。具有1：2的标称La/Cu原子比的La-CuO吸附剂与CuO吸附剂（25 g H2S/100 g吸附剂）相比实现了更高的容量（27和36 g H2S/100 g吸附剂）。使用能量色散X射线光谱和La L3-edge XAS对La-CuO吸附剂进行的比较表明，容量的增加是由于La在CuO相中更均匀的分散（3.3重量%）。相对于1.0重量% La）。X射线吸收近边结构分析表明La-CuO样品中有更多的富电子Cu物种，而扩展的X射线吸收精细结构模型显示相邻和近邻原子的单散射路径长度增加。这些变化表明La在Cu-O晶格中诱导应变，从而通过减少与氧原子和吸附的H2S分子之间的表面反应相关的能垒来增加H2S容量。
This work probes the effects of La on reactions involving CuO sorbents and H2S in gaseous streams. La‐CuO sorbents with nominal La/Cu atomic ratios of 1:2 achieved higher capacities (27 and 36 g H2S per 100 g sorbent) compared to CuO sorbents (25 g H2S per 100 g sorbent). Comparison of the La‐CuO sorbents using energy dispersive x‐ray spectroscopy and La L3‐edge XAS suggested that increased capacity resulted from more uniform dispersion of La within the CuO phase (3.3 wt.% vs. 1.0 wt.% La). X‐Ray absorption near edge structure analysis suggested more electron‐rich Cu species in La‐CuO samples, while extended X‐ray absorption fine structure modeling showed an increase in single‐scattering path lengths for neighboring and near‐neighbor atoms. These changes suggest that La induces strain in the Cu‐O lattice, thereby increasing H2S capacity by reducing energy barriers associated with surface reactions between oxygen atoms and adsorbed H2S molecules.