Pt/CexZr1-xO2 Catalysts for Total Oxidation of Propane

被引：0

作者：

Liao W. ^{[1
]}

Lu Y. ^{[1
]}

Zhao P. ^{[1
]}

Song Y. ^{[2
]}

Wang Y. ^{[1
]}

Luo M. ^{[1
]}

机构：

[1] Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua

[2] Jinhua Polytechnic, Jinhua

来源：

Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2020年 / 38卷 / 01期

关键词：

Active sites; Cerium-zirconium solid solution; Oxidation states of Pt species; Propane total oxidation; Pt catalysts;

D O I：

10.11785/S1000-4343.20200104

中图分类号：

学科分类号：

摘要：

Three supports (ZrO2, CeO2 and Ce0.7Zr0.3O2) were prepared using a precipitation method, and supported Pt catalysts were prepared using an impregnation method. These catalysts were tested for total oxidation of propane and the effects of water vapor on the catalytic behaviors were investigated. For the catalysts calcined at 500 ℃, the activities followed an order of Pt/ZrO2-500>Pt/CeO2-500>Pt/Ce0.7Zr0.3O2-500. For those calcined at 900 ℃, the activities followed an order of Pt/ZrO2-900>Pt/Ce0.7Zr0.3O2-900>Pt/CeO2-900. When 2.5 vol.% water vapor was added in the feed stream, the activities of the Pt/ZrO2 catalysts were suppressed (with the T50 increased by 10~25 ℃); the activity of the Pt/CeO2-500 was suppressed (with the T50 increased by 10 ℃) while that of the Pt/CeO2-900 was improved (with the T50 decreased by 25 ℃); the activities of the Pt/Ce0.7Zr0.3O2 catalysts were improved (with the T50 decreased by 5~25 ℃). It is concluded that the presence of metallic Pt species is beneficial to the improvement of catalytic activity. The Pt/Ce0.7Zr0.3O2-500 catalyst contains exclusively oxidized surface Pt species (Pt2+) while the Pt/Ce0.7Zr0.3O2-900 catalyst contains some metallic surface Pt species, which explains the improved activity observed on the Pt/Ce0.7Zr0.3O2-900. © 2020, Editorial Office of Journal of the Chinese Society of Rare Earths. All right reserved.

引用

页码：31 / 39

页数：8

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