| 张可欣,唐彤,李粉吉,夏福婷,贾丽娟,张秋林.沉淀剂和Ag含量变化对甲醛降解性能的影响[J].分子催化,2019,33(4):355-362 |
| 沉淀剂和Ag含量变化对甲醛降解性能的影响 |
| Effects of Precipitant and Ag Content on Formaldehyde Degradation Properties |
| 投稿时间：2019-07-10 修订日期：2019-07-23 |
| DOI： |
| 中文关键词: 甲醛 复合金属氧化物 银负载 共沉淀 |
| 英文关键词:formaldehyde mixed metal oxide silver load co-precipitation |
| 基金项目:国家自然科学基金（21567030，11447191） |
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| 摘要点击次数: 1475 |
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| 中文摘要: |
| 采用不同沉淀剂制备CeO2-Co3O4复合金属氧化物载体，通过浸渍负载不同含量Ag获得Ag/CeO2-Co3O4催化剂.借助氮气物理吸附、XRD、Raman和H2-TPR等手段研究了催化剂的物理化学性质.结果表明：当WHSV=30 000 mL·g-1·h-1时，催化剂能表现出良好的催化氧化甲醛性能，在≤ 90℃时实现甲醛的完全转化.草酸沉淀能有效降低Ce-Co氧化物的结晶度，使得Co2+含量增加，提供更多的氧空位，促进了氧分子的活化与迁移，从而提高了催化活性.随着Ag含量增加，使得由草酸沉淀制备的Ag/CeO2-Co3O4催化剂的活性增强，且金属与载体间的相互作用也增强，当Ag负载量为1%（重量百分比）时活性最佳. |
| 英文摘要: |
| CeO2-Co3O4 composite metal oxide support was prepared with different precipitants, and Ag/CeO2-Co3O4 catalyst was obtained by impregnating and loading Ag with different content. The physicochemical properties of the catalyst were studied by means of nitrogen physical adsorption, XRD, Raman and H2-TPR. The results show thatwhen WHSV=30 000 mL·g-1·h-1, the catalysts could achieve the complete purification of formaldehyde at ≤ 90℃ and showed excellent catalytic performance for the oxidative degradation of formaldehyde. Oxalic acid precipitation reduce the crystallinity of Ce-Co oxide, increase the content of Co2+, provide more oxygen vacancies, and promotes the activation and migration of oxygen molecules and increase the catalytic activity. With the increase of Ag content, the activity of Ag/CeO2-Co3O4 catalyst prepared by oxalic acid precipitation was enhanced, and the interaction between metal and support was also enhanced, and the activity was best when the Ag load was 1%(Weight percentage). |
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