Stabilizing Catalytic Pt-OH-Fe(III) Interfaces by Mesoporous TiO2 with Rich Surface Hydroxyl Groups

doi:10.6023/A18040140

Acta Chim. Sinica ›› 2018, Vol. 76 ›› Issue (8): 617-621.DOI: 10.6023/A18040140 Previous Articles Next Articles

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表面具丰富羟基的介孔TiO₂稳定Pt-OH-Fe(III)催化界面

吴庆远^a, 秦瑞轩^a, 臧丹丹^a, 张无用^a, 吴炳辉^b, 郑南峰^a

a 厦门大学化学化工学院厦门 361005;
b 厦门大学萨本栋微米纳米科学技术研究院厦门 361005

投稿日期:2018-04-16 发布日期:2018-06-22
通讯作者: 吴炳辉, 郑南峰 E-mail:binghuiwu@xmu.edu.cn;nfzheng@xmu.edu.cn
基金资助:
项目受国家重点研发计划（No.2017YFA02073022）、国家自然科学基金（Nos.21731005，21420102001，21333008和21721001）和中央高校基本科研业务费专项资金（No.20720180061）资助.

Stabilizing Catalytic Pt-OH-Fe(III) Interfaces by Mesoporous TiO₂ with Rich Surface Hydroxyl Groups

Wu Qingyuan^a, Qin Ruixuan^a, Zang Dandan^a, Zhang Wuyong^a, Wu Binghui^b, Zheng Nanfeng^a

a Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;
b Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361005, China

Received:2018-04-16 Published:2018-06-22
Contact: 10.6023/A18040140 E-mail:binghuiwu@xmu.edu.cn;nfzheng@xmu.edu.cn
Supported by:
Project supported by the National Key R&D Program of China (No. 2017YFA02073022), the National Natural Science Foundation of China (Nos. 21731005, 21420102001, 21333008, and 21721001), and the fundamental research funds for central universities (No. 20720180061).

1. Stabilizing Catalytic Pt-OH-Fe(III) Interfaces by Mesoporous TiO₂ with Rich Surface Hydroxyl Groups.PDF(1804KB)

Abstract

In supported heterogeneous catalysis, supports are used not only to enhance the metal dispersion and catalytic stability of metal catalysts, but also to create metal-support interfaces for improving their catalytic performance in specific reactions. For the interfaces controlled catalytic system, the construction of abundant and stable interfaces is very important. For this purpose, the physical and chemical properties of the support especially their surface species play the central role. In this work, mesoporous TiO₂ (m-TiO₂) with ultrahigh surface area (490 m²/g) was prepared by the hydrolysis of titanium glycolate complex. Highly dispersed metallic Pt nanoparticles (ca. 2.7 nm) with 1.9 wt% Pt loading were then supported onto the mesoporous TiO₂ by a UV deposition method at room temperature. While, for commercial P25 as the support, following the same protocol, ca. 6.7 nm Pt nanoparticles with only 0.2 wt% Pt loading were obtained. The Pt-OH-Fe(Ⅲ) interfaces were then successfully constructed by a facile deposition-precipitation procedure on both Pt/m-TiO₂ and Pt/P25. The as-prepared catalysts exhibited high activity for low temperature CO oxidation, 100% conversion was achieved at 313 K for the m-TiO₂ supported Fe(OH)_x-Pt catalyst, Fe(OH)_x-Pt/m-TiO₂, under 50% humidity condition with weight hourly space velocity (WHSV), ca. 400 L/g_Pt/h (1 vol% CO). In comparison, under the same conditions the P25 supported Fe(OH)_x-Pt catalyst, Fe(OH)_x-Pt/P25, reached 100% conversion at 323 K in the first light-off test but gradually deactivated in further test cycles. The performance of Pt-OH-Fe(Ⅲ) interfaces on m-TiO₂ were highly relied on the humidity of the feed gas. Despite the low activity under dry feed gas condition, Pt-OH-Fe(Ⅲ) interfaces exhibited robust catalytic performance during the long-time and humid/dry feed gas switch test, and the catalytic activity immediately recovered upon introduction of humid feed gas. It was revealed that, m-TiO₂ possessed rich surface hy-droxyl groups (10.6 mmol/g, 12.5 nm^-2) which were very sensitive to the humidity of feed gas. Through protons transfer on the surface, the rich and sensitive hydroxyl groups on m-TiO₂ maintained the Pt-OH-Fe(Ⅲ) interfaces from irreversible de-hydration. By contrast, for the hydroxyl groups on P25, a much lower density and smaller change were detected under both the dry and humid conditions, which resulted in irreversible deconstruction of the Pt-OH-Fe(Ⅲ) interfaces during the exothermic CO oxidation.

Key words: mesoporous TiO₂, CO oxidation, surface hydroxyl group, catalytic interface, catalytic oxidation

Cite this article

Wu Qingyuan, Qin Ruixuan, Zang Dandan, Zhang Wuyong, Wu Binghui, Zheng Nanfeng. Stabilizing Catalytic Pt-OH-Fe(III) Interfaces by Mesoporous TiO₂ with Rich Surface Hydroxyl Groups[J]. Acta Chim. Sinica, 2018, 76(8): 617-621.

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表面具丰富羟基的介孔TiO₂稳定Pt-OH-Fe(III)催化界面

Stabilizing Catalytic Pt-OH-Fe(III) Interfaces by Mesoporous TiO₂ with Rich Surface Hydroxyl Groups

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表面具丰富羟基的介孔TiO2稳定Pt-OH-Fe(III)催化界面