AuPd/3DOM TiO2 Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene

Three-dimensionally ordered macroporous (3DOM) TiO2-supported AuPd alloy (xAuyPd/3DOM TiO2 (x = 0.87⁻0.91 wt%; y = 0.51⁻1.86)) catalyst...

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Main Authors:	Xing Zhang, Yuxi Liu, Jiguang Deng, Kunfeng Zhang, Jun Yang, Zhuo Han, Hongxing Dai
Format:	Article
Language:	English
Published:	MDPI AG 2018-12-01
Series:	Catalysts
Subjects:	3D ordered macroporous titanium dioxide AuPd alloy nanoparticle supported AuPd catalyst chlorine-containing volatile organic compounds trichloroethylene oxidation
Online Access:	https://www.mdpi.com/2073-4344/8/12/666

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record_format	Article
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Xing Zhang Yuxi Liu Jiguang Deng Kunfeng Zhang Jun Yang Zhuo Han Hongxing Dai
spellingShingle	Xing Zhang Yuxi Liu Jiguang Deng Kunfeng Zhang Jun Yang Zhuo Han Hongxing Dai AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene Catalysts 3D ordered macroporous titanium dioxide AuPd alloy nanoparticle supported AuPd catalyst chlorine-containing volatile organic compounds trichloroethylene oxidation
author_facet	Xing Zhang Yuxi Liu Jiguang Deng Kunfeng Zhang Jun Yang Zhuo Han Hongxing Dai
author_sort	Xing Zhang
title	AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene
title_short	AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene
title_full	AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene
title_fullStr	AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene
title_full_unstemmed	AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene
title_sort	aupd/3dom tio<sub>2</sub> catalysts: good activity and stability for the oxidation of trichloroethylene
publisher	MDPI AG
series	Catalysts
issn	2073-4344
publishDate	2018-12-01
description	Three-dimensionally ordered macroporous (3DOM) TiO<sub>2</sub>-supported AuPd alloy (<i>x</i>Au<i><sub>y</sub></i>Pd/3DOM TiO<sub>2</sub> (<i>x</i> = 0.87⁻0.91 wt%; <i>y</i> = 0.51⁻1.86)) catalysts for trichloroethylene (TCE) oxidation were prepared using the polymethyl methacrylate-templating and polyvinyl alcohol-protected reduction methods. The as-prepared materials possessed a good-quality 3DOM structure and a surface area of 49⁻53 m<sup>2</sup>/g. The noble metal nanoparticles (NPs) with a size of 3⁻4 nm were uniformly dispersed on the surface of 3DOM TiO<sub>2</sub>. The 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> sample showed the highest catalytic activity with the temperature at a TCE conversion of 90% being 400 °C at a space velocity of 20,000 mL/(g h). Furthermore, the 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> sample possessed better catalytic stability and moisture-resistant ability than the supported Au or Pd sample. The partial deactivation induced by H<sub>2</sub>O introduction of 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> was reversible, while that induced by CO<sub>2</sub> addition was irreversible. No significant influence on TCE conversion was observed after introduction of 100 ppm HCl to the reaction system over 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub>. The lowest apparent activation energy (51.7 kJ/mol) was obtained over the 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> sample. The doping of Au to Pd changed the TCE oxidation pathway, thus reducing formation of perchloroethylene. It is concluded that the high adsorbed oxygen species concentration, good low-temperature reducibility, and strong interaction between AuPd NPs and 3DOM TiO<sub>2</sub> as well as more amount of strong acid sites were responsible for the good catalytic activity, stability, and water- and HCl-resistant ability of 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub>. We believe that 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> may be a promising catalyst for the oxidative elimination of chlorine-containing volatile organics.
topic	3D ordered macroporous titanium dioxide AuPd alloy nanoparticle supported AuPd catalyst chlorine-containing volatile organic compounds trichloroethylene oxidation
url	https://www.mdpi.com/2073-4344/8/12/666
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spelling	doaj-caa083412b384a83b12999cf4d337d4c2020-11-25T00:44:15ZengMDPI AGCatalysts2073-43442018-12-0181266610.3390/catal8120666catal8120666AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of TrichloroethyleneXing Zhang0Yuxi Liu1Jiguang Deng2Kunfeng Zhang3Jun Yang4Zhuo Han5Hongxing Dai6Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaBeijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaBeijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaBeijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaBeijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaBeijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaBeijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, ChinaThree-dimensionally ordered macroporous (3DOM) TiO<sub>2</sub>-supported AuPd alloy (<i>x</i>Au<i><sub>y</sub></i>Pd/3DOM TiO<sub>2</sub> (<i>x</i> = 0.87⁻0.91 wt%; <i>y</i> = 0.51⁻1.86)) catalysts for trichloroethylene (TCE) oxidation were prepared using the polymethyl methacrylate-templating and polyvinyl alcohol-protected reduction methods. The as-prepared materials possessed a good-quality 3DOM structure and a surface area of 49⁻53 m<sup>2</sup>/g. The noble metal nanoparticles (NPs) with a size of 3⁻4 nm were uniformly dispersed on the surface of 3DOM TiO<sub>2</sub>. The 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> sample showed the highest catalytic activity with the temperature at a TCE conversion of 90% being 400 °C at a space velocity of 20,000 mL/(g h). Furthermore, the 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> sample possessed better catalytic stability and moisture-resistant ability than the supported Au or Pd sample. The partial deactivation induced by H<sub>2</sub>O introduction of 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> was reversible, while that induced by CO<sub>2</sub> addition was irreversible. No significant influence on TCE conversion was observed after introduction of 100 ppm HCl to the reaction system over 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub>. The lowest apparent activation energy (51.7 kJ/mol) was obtained over the 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> sample. The doping of Au to Pd changed the TCE oxidation pathway, thus reducing formation of perchloroethylene. It is concluded that the high adsorbed oxygen species concentration, good low-temperature reducibility, and strong interaction between AuPd NPs and 3DOM TiO<sub>2</sub> as well as more amount of strong acid sites were responsible for the good catalytic activity, stability, and water- and HCl-resistant ability of 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub>. We believe that 0.91Au<sub>0.51</sub>Pd/3DOM TiO<sub>2</sub> may be a promising catalyst for the oxidative elimination of chlorine-containing volatile organics.https://www.mdpi.com/2073-4344/8/12/6663D ordered macroporous titanium dioxideAuPd alloy nanoparticlesupported AuPd catalystchlorine-containing volatile organic compoundstrichloroethylene oxidation

AuPd/3DOM TiO<sub>2</sub> Catalysts: Good Activity and Stability for the Oxidation of Trichloroethylene

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