Removal of formaldehyde over MnxCe1-xO2 catalysts: Thermal catalytic oxidation versus ozone catalytic oxidation

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Title:	Removal of formaldehyde over MnxCe1-xO2 catalysts: Thermal catalytic oxidation versus ozone catalytic oxidation
Authors:	張木彬;Li, Jia Wei;Pan, Kuan Lun;Yu, Sheng Jen;Yan, Shaw Yi;Chang, Moo Been
Contributors:	工學院環境工程研究所
Keywords:	carbon dioxide;catalysts;catalytic activity;ceric oxide;durability;Formaldehyde;HCHO;Indoor air pollutant;manganese;mineralization;oxidation;ozone;Ozone catalytic oxidation;Pechini法;semiconductors;temperature;Thermal catalytic oxidation;titanium dioxide;Volatile organic compounds;催化剂;分解效率;氧化物半导体;甲醛;耐久性试验;臭氧催化氧化
Date:	2014-01-01
Issue Date:	2026-04-23 15:09:01 (UTC+8)
Publisher:	Chinese Academy of Sciences;Elsevier B.V
Abstract:	摘要： MnxCe1- xO2（x： 0.3–0.9） prepared by Pechini method was used as a catalyst for the thermal catalytic oxidation of formaldehyde（HCHO）. At x = 0.3 and 0.5, most of the manganese was incorporated in the fluorite structure of Ce O2 to form a solid solution. The catalytic activity was best at x = 0.5, at which the temperature of 100% removal rate is the lowest（270°C）. The temperature for 100% removal of HCHO oxidation is reduced by approximately 40°C by loading 5 wt.% Cu Oxinto Mn0.5Ce0.5O2. With ozone catalytic oxidation, HCHO（61 ppm） in gas stream was completely oxidized by adding 506 ppm O3 over Mn0.5Ce0.5O2 catalyst with a GHSV（gas hourly space velocity） of 10,000 hr-1at 25°C. The effect of the molar ratio of O3 to HCHO was also investigated. As O3/HCHO ratio was increased from 3 to 8, the removal efficiency of HCHO was increased from 83.3% to 100%. With O3/HCHO ratio of 8, the mineralization efficiency of HCHO to CO2 was 86.1%. At 25°C, the p-type oxide semiconductor（Mn0.5Ce0.5O2） exhibited an excellent ozone decomposition efficiency of 99.2%,which significantly exceeded that of n-type oxide semiconductors such as Ti O2, which had a low ozone decomposition efficiency（9.81%）. At a GHSV of 10,000 hr-1, [O3]/[HCHO] = 3 and temperature of 25°C, a high HCHO removal efficiency（≥ 81.2%） was maintained throughout the durability test of 80 hr, indicating the long-term stability of the catalyst for HCHO removal. 其他題名： Journal of Environmental Sciences 出版者： Elsevier B.V 出版日期： 2014-12-01 出處： Journal of environmental sciences (China), 2014-12, Vol.26 (12), p.2546-2553 版權： 2014 識別號： ISSN: 1001-0742 識別號： EISSN: 1878-7320 識別號： DOI: 10.1016/j.jes.2014.05.030
Appears in Collections:	[Graduate Institute of Environmental Engineering ] journal & Dissertation

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