Browsing by Author "Wang, ChenYeh"

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A comparative investigation on the low-temperature catalytic oxidation of acetone over porous aluminosilicate-supported cerium oxides
(2015-03-15)
Lin, Liang-Yi
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Wang, ChenYeh
;
Bai, Hsunling
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環境工程研究所
;
Institute of Environmental Engineering
The performance of cerium oxide supported on mesoporous aluminosilicate particles (Al-MSPs) with a nominal Ce and Al loading of 2.8 and 1.2 wt.%, respectively, was evaluated for the low-temperature oxidation of acetone. The influence of the preparation methods, including one-step aerosol-assisted self-assembly (AASA) method and post-synthetic wet impregnation method, was examined. The results showed that the surface area and pore diameter of Ce/Al-MSPs(50/25) prepared by AASA method were similar to those of Ce-Al-MSPs made via traditional impregnation method, while a better metallic dispersion of Ce and Al oxide species on Ce/Al-MSP5(50/25) was observed as compared to that of Ce-Al-MSPs. The catalytic performances of Ce/Al-MSPs(50/25) and Ce-Al-MSPs were compared with that of cerium-impregnated H-ZSM-5 (Ce-ZSM-5) zeolite catalyst. The activity of freshly made catalysts followed the order: Ce/Al-MSPs(50/25) > Ce-ZSM-5 > Ce-Al-MSPs. The superior catalytic behavior of the Ce/Al-MSPs(50/25) could be due to the combined effect of strong surface reducibility and high acid property. Although Ce-ZSM-5 and Ce-Al-MSPs presented high activity for acetone removal in the beginning, their activities quickly decreased due to the coking effect. In contrast, Ce/Al-MSP5(50/25) showed a good stability during a 24 h test at the reaction temperature of 150 degrees C. Both surface reducibility and acidity played crucial roles for their high catalytic performance and high stability at low temperatures. (C) 2014 Elsevier B.V. All rights reserved.
Catalytic Incineration of Acetone on Mesoporous Silica Supported Metal Oxides Prepared by One-Step Aerosol Method
(2011-04-06)
Wang, ChenYeh
;
Bai, Hsunling
;
環境工程研究所
;
Institute of Environmental Engineering
Mesoporous silica supported metal oxide catalysts were synthesized by a one-step fast aerosol process based on an evaporation induced self-assembly (EISA) method. They were then applied to the catalytic incineration of VOCs with acetone as the target species. The synthesized metal-MSPs (mesoporous silica particles) were characterized by N(2) adsorption-desorption measurements, X-ray diffraction (XRD), transmission electron microscopy (TEM), and inductively coupled plasma-mass spectrometer (ICP-MS) to understand their physical and chemical properties. Tests on various metals of Ce, Mn, Cu, Fe, and Al supported on MSPs over a temperature range of 150-350 degrees C demonstrated that Ce is the best metal for the catalytic incineration of acetone. The Ce-MSPs(10) has a high Ce loading of 9.76 wt %, but its small specific surface area of 615 m(2)/g, poor pore size distribution, and less-ordered pore structure resulted in a relatively lower acetone removal as compared to the Ce-MSPs(25). The Ce-MSPs (25) catalyst appeared to be the best acetone catalytic incineration performance due to the high specific surface area of 951 m(2)/g with highly ordered pore structure as well as optimal Ce metal content of 3.72 wt % so that CeO(2) particles were well dispersed on the porous surfaces. Near complete acetone destruction via Ce-MSPs(25) catalyst was achieved at a temperature of 250 degrees C, acetone inlet concentration of 1000 ppmv and GHSV of 5000 h(-1). The long-term stability test showed that the acetone destruction efficiency can be kept constant during the 96 h test period.