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Influence of LaNiO3 Shape on Its Solid-Phase Crystallization into Coke-Free Reforming Catalysts
ACS Catalysis ( IF 11.3 ) Pub Date : 2016-06-03 00:00:00 , DOI: 10.1021/acscatal.6b00673 Sarika Singh 1 , Daria Zubenko 1 , Brian A. Rosen 1
ACS Catalysis ( IF 11.3 ) Pub Date : 2016-06-03 00:00:00 , DOI: 10.1021/acscatal.6b00673 Sarika Singh 1 , Daria Zubenko 1 , Brian A. Rosen 1
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Shape-controlled LaNiO3 nanoparticles were prepared by modified hydrothermal and precipitation routes resulting in cubes, spheres, and rods. The solid-phase crystallization of LaNiO3 into its active catalyst form, Ni/La2O3, was found to be highly dependent on the shape and structure of the parent nanoparticle. Factors such as the crystallization pathway and Ni2+-ion depletion are considered as key factors influencing the final material. Catalysts derived from LaNiO3 spheres and rods were found to be free of carbon accumulation after 100 h of reforming, while those derived from cubes showed excessive carbon accumulation and signs of sintering. All three catalysts are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and thermogravimetric analyses (TGA). The presence of defects, particularly stacking faults within the perovskite, may impact the reduction pathway and subsequent catalytic properties. Stable and active catalysts can therefore be designed and tuned by controlling the shape and structure of perovskite precursors.
中文翻译：
LaNiO 3形状对其在无焦重整催化剂中固相结晶的影响
通过改进的水热和沉淀途径制备了形状可控的LaNiO 3纳米颗粒，形成了立方体，球形和棒状。发现LaNiO 3固相结晶成其活性催化剂形式Ni / La 2 O 3高度依赖于母体纳米颗粒的形状和结构。诸如结晶途径和Ni 2+离子耗竭等因素被认为是影响最终材料的关键因素。源自LaNiO 3的催化剂重整100小时后，发现球和棒没有积碳，而来自立方体的球和棒显示出过量的碳积聚和烧结迹象。这三种催化剂的特征均在于X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），程序升温还原（TPR）和热重分析（TGA）。缺陷的存在，尤其是钙钛矿内部的堆积缺陷，可能会影响还原途径和随后的催化性能。因此，可以通过控制钙钛矿前体的形状和结构来设计和调整稳定和活性的催化剂。
更新日期：2016-06-03
中文翻译：
LaNiO 3形状对其在无焦重整催化剂中固相结晶的影响
通过改进的水热和沉淀途径制备了形状可控的LaNiO 3纳米颗粒，形成了立方体，球形和棒状。发现LaNiO 3固相结晶成其活性催化剂形式Ni / La 2 O 3高度依赖于母体纳米颗粒的形状和结构。诸如结晶途径和Ni 2+离子耗竭等因素被认为是影响最终材料的关键因素。源自LaNiO 3的催化剂重整100小时后，发现球和棒没有积碳，而来自立方体的球和棒显示出过量的碳积聚和烧结迹象。这三种催化剂的特征均在于X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），程序升温还原（TPR）和热重分析（TGA）。缺陷的存在，尤其是钙钛矿内部的堆积缺陷，可能会影响还原途径和随后的催化性能。因此，可以通过控制钙钛矿前体的形状和结构来设计和调整稳定和活性的催化剂。
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