...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Structural characteristics and catalytic performance of alumina-supported nanosized ceria-lantfaana solid solutions
【24h】

Structural characteristics and catalytic performance of alumina-supported nanosized ceria-lantfaana solid solutions

机译：氧化铝支持的纳米式陶瓷固体溶液的结构特性和催化性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Alumina-supported nanosized ceria-lanthana solid solutions (CeO2-La2O3/Al2O3 (CLA) = 80:20:100 mol% based on oxides) were synthesized by a modified deposition coprecipitation method from ultra-high dilute aqueous solutions. The synthesized materials were subjected to various calcination temperatures from 773 to 1073 K to understand the surface structure and the thermal stability. Structural and redox properties were deeply investigated by different characterization techniques, namely, X-ray diffraction (XRD), Raman spectroscopy (RS), transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), temperature programmed reduction (H2-TPR), and Brunauer-Emmett-Teller (BET) surface area. The catalytic efficiency was evaluated for CO oxidation at normal atmospheric pressure. BET surface area measurements revealed that synthesized samples exhibit reasonably high specific surface area. As revealed by XRD measurements, samples maintain structural integrity up to 1073 K without any disproportionation of phases. XPS results suggested that there is no significant change in the Ce~(3 +) amount during thermal treatments due to the absence of undesirable cerium aluminate formation. A significant number of oxygen vacancies were confirmed from Raman and UV-vis DRS measurements. The CLA 773 sample exhibited superior CO oxidation activity. The better activity of the catalyst was proved to be due to a high dispersion in the form of nanosized ceria-lanthana solid solutions over the alumina support, facile reduction, and a high oxygen storage capacity.
机译：氧化铝支持的纳米纳米式谷物溶液（CEO2-LA2O3/AL2O3（CLA）= 80：20：20：20：100 mol％基于氧化物的基于氧化物）通过改良的沉积沉积子沉淀方法从超高的稀释水溶液中进行。将合成的材料从773至1073 K处进行各种钙化温度，以了解表面结构和热稳定性。通过不同的表征技术，即X射线衍射（XRD），拉曼光谱法（RS），透射电子显微镜（TEM），UV-可见性弥漫性反射光谱光谱（UV-VIS DRS），X--- X---VIS DRS，X--------VIS DRS，X-----Vis DRS，X--射线光电子光谱（XPS），温度编程还原（H2-TPR）和Brunauer-Emmett-Teller（BET）表面积。评估了在正常大气压下的催化效率。 BET表面积测量结果表明，合成样品表现出相当高的特异性表面积。如XRD测量结果所示，样品保持了最高1073 K的结构完整性，而没有任何相位。 XPS的结果表明，由于没有不良的铝制形成，在热处理过程中CE〜（3 +）量没有显着变化。从拉曼和UV-VIS DRS测量中确认了大量的氧空位。 CLA 773样品表现出优质的CO氧化活性。事实证明，催化剂的更好活性是由于氧化铝二下溶液的形式很高，而氧化铝的固体溶液比氧化铝载体，便捷的降低和高氧储存能力所致。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号