Co₃O₄催化剂的不同形态及其在一氧化碳减排中的应用。

Chih-Wei Tang, Hsiang-Yu Shih, Ruei-Ci Wu, Chih-Chia Wang, Chen-Bin Wang
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引用次数: 1

摘要

不完全燃烧引起的有害一氧化碳(CO)的增加会影响人体健康,甚至导致窒息。因此,减少汽车或工厂排放的一氧化碳是改善空气质量的迫切需要。尖晶石钴(II, III)氧化物(Co₃O₄)是Co减排的活性催化剂。本研究以乙酸、甲酸、草酸为螯合分散剂,采用分散-沉淀法制备分散型Co₃O₄。然后,将制备好的样品在300℃下煅烧4 h,得到活性催化剂,分别指定为Co(A)、Co(F)和Co(O),分散剂的用量分别标记为I(0.12摩尔)、II(0.03摩尔)和III(0.01摩尔)。为了比较,另一种CoAP样品通过碱诱导沉淀法制备,并在300℃下煅烧。通过x射线衍射(XRD)、程序升温还原(TPR)、扫描电镜(SEM)和氮气吸附/解吸系统对样品进行了表征,结果表明,样品的催化活性主要集中在CO的氧化上。研究了螯合分散剂对CO去除性能的影响。结果表明,螯合分散剂对CO减排的催化活性有明显的影响。优化分散剂配比可以提高催化剂的性能,而过量的分散剂会降低催化剂的表面积和催化性能。该系列Co(O)样品由于Co-O键的不稳定,可以很容易地提供活性氧,表现出比Co(A)和Co(F)样品更优的性能。纳米棒Co(O)-II更有利于Co的氧化,T50和T90分别接近96和127℃。此外,Co(O)-II样品的良好耐久性在130℃下保持95%的转化率50小时,不会出现失活现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Different Morphology of Co₃O₄ Catalysts and Application in the Abatement of Carbon Monoxide.

The increase of harmful carbon monoxide (CO) caused by incomplete combustion can affect human health even lead to suffocation. Therefore reducing the CO discharged by vehicles or factories is urgent to improve the air quality. The spinel cobalt (II, III) oxide (Co₃O₄) is an active catalyst for CO abatement. In this study, we tried to fabricate dispersing Co₃O₄ via the dispersion-precipitation method with acetic acid, formic acid, and oxalic acid as the chelating dispersants. Then, the asprepared samples were calcined at 300 ºC for 4 h to obtain active catalysts, and assigned as Co(A), Co(F) and Co(O) respectively, the amount of the dispersants used are labeled as I (0.12 mole), II (0.03 mole) and III (0.01 mole). For comparison, another CoAP sample was prepared via alkaliinduced precipitation and calcined at 300 ºC. All samples were characterized by X-ray diffraction (XRD), temperature-programmed reduction (TPR), scanning electron microscope (SEM), and nitrogen adsorption/desorption system, and the catalytic activity focused on the CO oxidation. The influence of chelating dispersant on the performance of abatement of CO was pursued in this study. Apparently, the results showed that the chelating dispersant can influence the catalytic activity of CO abatement. An optimized ratio of dispersant can improve the performance, while excess dispersant lessens the surface area and catalytic performance. The series of Co(O) samples can easily donate the active oxygen since the labile Co-O bonding and indicated the preferential performance than both Co(A) and Co(F) samples. The nanorod Co(O)-II showed preferential for CO oxidation, T50 and T90 approached 96 and 127 ºC, respectively. Also, the favorable durability of Co(O)-II sample maintains 95% conversion still for 50 h at 130 ºC and does not emerge deactivation.

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来源期刊
Journal of nanoscience and nanotechnology
Journal of nanoscience and nanotechnology 工程技术-材料科学:综合
自引率
0.00%
发文量
0
审稿时长
3.6 months
期刊介绍: JNN is a multidisciplinary peer-reviewed journal covering fundamental and applied research in all disciplines of science, engineering and medicine. JNN publishes all aspects of nanoscale science and technology dealing with materials synthesis, processing, nanofabrication, nanoprobes, spectroscopy, properties, biological systems, nanostructures, theory and computation, nanoelectronics, nano-optics, nano-mechanics, nanodevices, nanobiotechnology, nanomedicine, nanotoxicology.
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