Catalytic performance of Pd-NiCo2O4/SiO2 in lean methane combustion at low temperature
Catalytic performance of Pd-NiCo2O4/SiO2 in lean methane combustion at low temperature
复制标题
Pd-NiCo 2 O 4 /SiO 2 在贫甲烷低温燃烧中的催化性能
DOI：
10.1016/j.joei.2017.05.008
复制
发表时间：
2018-10-01
影响因子：
5.7
通讯作者：
Zhang, Haitao
中科院分区：
文献类型：
--
作者：
Huang, Qifu;Li, Wenzhi;Zhang, Haitao
本文制备了Pd-NiCo 2 O 4/SiO2催化剂，并将其应用于贫甲烷催化燃烧。Pd和NiCo 2 O 4纳米颗粒均匀地分布在SiO2载体上，使得每个Pd或NiCo 2 O 4纳米颗粒通过另一组分彼此分离。与Co 3 O 4/SiO2、NiCo 2 O 4/SiO2、Pd-Co 3 O 4/SiO2和Pd#NiCo2O4/SiO2（没有Pd和NiCo 2 O 4纳米颗粒均匀分布的催化剂）相比，Pd-NiCo 2 O 4/SiO2在贫甲烷催化燃烧中具有最高的催化活性，甲烷全转化温度为378 ℃。此外，高活性在长时间反应中不降低，表现出良好的热稳定性。TEM和BET结果表明，Pd和NiCo 2 O 4的粒径很小。XRD分析表明，Pd纳米粒子高度分散在SiO2表面。XPS分析表明，催化剂表面形成了NiCO_2O_4，存在足够的活性氧物种和较高的PdO/Pd-0比值。对比试验也证明了Ni的引入对催化剂性能的增强作用。这些结果表明，Pd-NiCo 2 O 4/SiO2催化剂的高催化活性主要来源于纳米粒子的分布和Ni阳离子的增强。(C)2017年能源研究所。由爱思唯尔有限公司出版。保留所有权利。
In this paper, the catalyst of Pd-NiCo2O4/SiO2 was prepared and applied to the catalytic combustion of lean methane. Pd and NiCo2O4 nanoparticles were uniformly distributed on the SiO2 support, so that every Pd or NiCo2O4 nanoparticle was separated from each other by another component. Comparing with Co3O4/SiO2, NiCo2O4/SiO2, Pd-Co3O4/SiO2 and Pd#NiCo2O4/SiO2 (catalysts without uniform distribution of Pd and NiCo2O4 nanoparticles), Pd-NiCo2O4/SiO2 had the highest catalytic activity in the catalytic combustion of lean methane, with a methane total conversion temperature at 378 degrees C. In addition, the high activity did not decrease during the long time reaction, which showed good thermal stability. TEM and BET results showed that the nanoparticle sizes of Pd and NiCo2O4 were very small. The XRD patterns indicated that the Pd nanoparticles were highly dispersed on the surface of SiO2. The XPS spectra demonstrated the formation of NiCO2O4, the presence of enough active oxygen species on the catalyst surface and the high ratio of PdO/Pd-0 . The enhanced influence of Ni introduction was also proved by comparison tests. All these results indicated that the high catalytic activity of Pd-NiCo2O4/SiO2 mainly comes from the nanoparticle distribution and the Ni cation enhancement. (C) 2017 Energy Institute. Published by Elsevier Ltd. All rights reserved.