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Effect of Pd loading on ZrO2 support resulting from pyrolysis of UiO-66: Application to CO oxidation.
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.jcis.2020.03.120
Fukun Bi 1 , Xiaodong Zhang 1 , Shang Xiang 1 , Yunyun Wang 1
Affiliation  

The effect of Pd loading (0.25, 0.5 and 1.0 wt%) and ZrO2 support calcined at diverse temperatures (600, 700 and 800 °C) by pyrolysis of UiO-66 was investigated for CO oxidation in this work, respectively. The physicochemical properties of the samples were characterized by various characterization methods. The XRD results exhibited that all ZrO2 support possessed mixed crystalline phase, the monoclinic ZrO2 and tetragonal ZrO2. And the calcination temperature had a big impact on the composition of ZrO2 supports. Pyrolysis of UiO-66 at high temperature was favorable for the formation of monoclinic ZrO2. Additionally, the introduction of Pd was induced the phase conversion from tetragonal to monoclinic of ZrO2. The order of catalytic efficiency was as follows: 0.5Pd/Zr-700 > 0.5Pd/Zr-600 > 0.5Pd/Zr-800. Moreover, 0.5Pd/Zr-700 presented high stability and great reusability. The good catalytic performance of 0.5Pd/Zr-700 was ascribed to the better reduction ability at low temperature and high Oads/Olat and Pd0/Pd2+ on the surface. Importantly, the reaction pathway of CO oxidation over the 0.5Pd/Zr-700 was exposed.

中文翻译:

Pd负载对UiO-66热解产生的ZrO2载体的影响:在CO氧化中的应用。

在这项工作中,分别研究了通过UiO-66热解在不同温度(600、700和800°C)下煅烧的Pd负载量(0.25、0.5和1.0 wt%)和ZrO2载体对CO氧化的影响。通过各种表征方法表征了样品的理化性质。XRD结果表明,所有ZrO2载体均具有混合晶相,单斜晶ZrO2和四方晶ZrO2。煅烧温度对ZrO2载体的组成影响很大。UiO-66的高温热解有利于单斜晶ZrO2的形成。另外,Pd的引入引起ZrO2从四方晶系到单斜晶系的相转化。催化效率的顺序如下:0.5Pd / Zr-700> 0.5Pd / Zr-600> 0.5Pd / Zr-800。此外,0。5Pd / Zr-700具有很高的稳定性和可重复使用性。0.5Pd / Zr-700的良好催化性能归因于其在低温,高Oads / Olat和Pd0 / Pd2 +的较低表面还原能力。重要的是,暴露了在0.5Pd / Zr-700上CO氧化的反应途径。
更新日期:2020-03-31
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