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室内空气VOCs吸附-电热催化耦合功能组件及在空气净化器中应用研究
姜风
Thesis Advisor陈运法
2018-07
Degree Grantor中国科学院研究生院
Degree Name硕士
Degree Discipline化学工程
KeywordVocs催化氧化,Ptc恒温加热电阻,空气净化器
Abstract

挥发性有机物(volatile organic compounds, VOCs)是室内空气的主要污染物之一,其主要来源于建筑材料、室内装饰材料以及办公用品等。对比现有VOCs的处理技术,热催化氧化技术可以将VOCs氧化分解,热催化氧化技术中使用的催化剂分为贵金属和非贵金属两种,其中贵金属催化剂催化分解VOCs的T90温度普遍比非贵金属催化剂低。但是传统的热催化技术加热组件和贵金属催化剂组件是两个独立的组件,加热温度高,超出了家用空气净化器的工作温度,安全性差,因此限制了其在室内空气净化中的应用。本论文研究了一种VOCs吸附-电热催化耦合功能组件,将贵金属催化剂粉末直接涂覆到蜂窝状PTC恒温加热电阻上,将传统加热组件和贵金属催化剂组件合二为一,降低了热催化氧化温度,提升了安全性,组件体积大幅减小,同时将热催化氧化VOCs组件安装到空气净化器内,并做了性能测试。本论文研究内容和成果如下:1.采用浸渍法合成了2wt.%Pt/γ-Al2O3粉末催化剂,并通过XRD、SEM、EDS测试表征手段对其物理化学性质进行了分析,考察了对邻二甲苯在不同温度下催化氧化性能,2wt. %Pt/γ-Al2O3粉末催化剂T90转化温度为178℃。2.研究了Pt/γ-Al2O3粉末催化剂涂覆到蜂窝状PTC恒温加热电阻表面的涂覆工艺,通过对PTC恒温电阻表面处理、涂覆基底涂层和催化剂涂层,制成PTC催化氧化VOCs部件。上述部件测试了在不同温度下邻二甲苯转化率,邻二甲苯的T90转化温度200 ℃,PTC恒温加热电阻居里温度250℃,可以满足要求。实现了在200℃到300℃温度范围内直接热催化分解VOCs。3.将多个PTC催化氧化VOCs部件组合成净化组件并安装到空气净化器内,在密闭实验舱内测试净化邻二甲苯性能, 211.2ml PTC催化剂的VOCs吸附-电热催化耦合功能组件对邻二甲苯1小时净化效率约32.9%,6个小时约90.8%;对甲醛1个小时净化效率51%,4个小时效率约91%,对室内VOCs有净化效果。;AbstractVolatile organic compounds (VOCs) are the main pollutants in indoor air, which come from building materials, indoor decorating materials and office supplies. Among different VOCs-abating technologies, thermocatalytic oxidation is an effective way to solve VOCs pollution. The catalysts used in thermocatalytic oxidation of VOCs contain noble-metal catalysts and non-noble metal catalysts. And the T90 of noble catalysts is much lower than that of non-noble catalysts. The traditional heating and noble metal catalysts are two separate components, which are difficult to be applied in household air purifiers. Therefore thermocatalytic oxidation is limited in the usage in household air purifiers. In this paper, a VOCs adsorption-thermocatalytic oxidation coupling component was studied. The noble metal catalyst powder was coated directly on the PTC heating component to combine traditional heating component and the noble metal catalyst. As a result, the temperature of the thermal catalytic oxidation was reduced, and the volume of the component was greatly reduced. Finally, the thermal catalytic oxidation VOCs component were installed in the air purifier and the performance test was performed.The contents and results are as follows: 1. Pt/γ-Al2O3(2wt.%) powder catalyst was prepared by impregnation method and characterized by XRD、SEM、EDS. The conversion rate of o-xylene at different temperatures was tested. The T90 of 2wt.% Pt/γ-Al2O3 is 178oC, lower than the Curie temperature of PTC(250oC). 2. The coating method of Pt/γ-Al2O3 powder catalyst on the surface of the honeycomb PTC heating resistor was studied. A series of procedures including treating the PTC heating resistor surface, coating the substrate, coating the catalyst was conducted to produce the PTC catalytic component. The final product was tested for the catalytic oxidation o-xylene at different temperatures. The T90 of PTC catalytic component is 200℃, lower than the Curie temperature of PTC(250oC). The temperature of direct thermal catalytic of o-xylene is between 200 ℃and 300 ℃. 3. Several PTC catalytic components were installed into air purifiers, and tested the performance curve of the decontamination O-xylene in a closed laboratory chamber. 211.2ml PTC catalytic components has a purification efficiency of about 32.9% for o-xylene in 1 hour, 90.8% in 6 hours, and a purification efficiency of about 91% for formaldehyde in 4 hours.

Language中文
Document Type学位论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/26908
Collection中国科学院过程工程研究所
研究所(批量导入)
Recommended Citation
GB/T 7714
姜风. 室内空气VOCs吸附-电热催化耦合功能组件及在空气净化器中应用研究[D]. 中国科学院研究生院,2018.
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