| 徐晓波.Pt/TiO2催化剂的制备及其在氨催化氧化中的应用[J].分子催化,2014,(1):75-81 |
| Pt/TiO2催化剂的制备及其在氨催化氧化中的应用 |
| Preparation and Application of Core-shell Pt/TiO2 Catalyst for Ammonia Oxidation Process |
| 投稿时间：2013-12-10 修订日期：2014-01-09 |
| DOI： |
| 中文关键词: 光还原沉积 Pt/ TiO2催化剂 核壳型催化剂 氨氧化 铂耗 |
| 英文关键词:Photo-reduction deposition, Pt/ TiO2 catalyst, core-shell catalyst, ammonia oxidation, platinum loss |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 二氧化钛具有优良的光催化性能，以其为载体通过光催化还原沉积可在其表面实现单质金属活性组分负载。本研究选择二氧化钛颗粒为载体，通过紫外光照射在二氧化钛颗粒表面还原沉积铂单质，形成Pt/ TiO2核壳结构，并将该新型催化剂用于氨催化氧化反应。所制备的Pt/TiO2催化剂铂负载量减为0.2 gPt/ gTiO2，比表面积增达10 m2/ g。以该催化剂催化氨氧化反应，氨转化率在600-700 篊即可达100 %，低于目前硝酸工业中氨氧化反应温度800-900 篊，也低于PtO2升华温度850 篊。该催化剂经400 h连续反应，其铂载量、及催化活性均无降低，具有工业应用前景。 |
| 英文摘要: |
| Titanium dioxide is an excellent photocatalyst, which can be utilized to load pure metal on its surface with photocatalytic reduction deposition process. In this study, pure metallic platinum was loaded on the surface of TiO2 particles with UV light irradiation to construct Pt/ TiO2 core-shell structure catalyst for ammonia oxidation process. The Pt loading of catalyst is decreased to about 0.2 gPt/gTiO2, ant specific surface area is as large as 10 m2/g. With such catalyst, the ammonia conversion in ammonia oxidation process can reach 100 % at 600-700 oC, which is lower than the application temperature in present nutric acid industry, 800-900 篊, and the sublimation temperature of PtO2, 850 oC. Furthermore, there is no platinum loss and reaction active reduction of catalysts after 400 hours’ continuous running. Therefore, this Pt/ TiO2 core-shell structure catalyst has exhibits a valuable application prospect of precious metal in nitric acid industry. |
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