| 陈莹,贺军辉,田华,王东辉,杨巧文.化学通报,2015,78(3):231-236. |
| 涂覆在堇青石上的负载贵金属催化剂催化氧化甲醛的性能研究 |
| Catalytic oxidation of formaldehyde over supported noble metal catalyst coated on cordierite |
| 投稿时间：2014-07-15 修订日期：2014-07-15 |
| DOI： |
| 中文关键词: 负载贵金属催化剂 蜂窝陶瓷载体 料浆涂覆 涂层 |
| 英文关键词:supported noble metal catalyst honeycomb ceramics slurry coating coating |
| 基金项目:国家自然科学基金项目(21271177)和中国科学院理化技术研究所所长基金资助 |
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| 中文摘要: |
| 将催化性能优异的负载贵金属催化剂与拟薄水铝石溶胶混合,制备得到均匀的料浆,采用料浆涂覆法将其负载到堇青石蜂窝陶瓷基体上,考察了拟薄水铝石(AlOOH)含量对涂层形貌、负载量、涂层牢固度的影响,并对合成的整体式催化剂进行甲醛催化性能测试。研究表明：合成的负载贵金属催化剂Pt粒子粒径为1.14 nm时,可在17℃下完全降解甲醛；涂覆过程中拟薄水铝石含量越高,载体负载量越大,但过高易导致孔道堵塞,涂覆不均和涂层龟裂；超声震荡测试表明拟薄水铝石含量对涂层牢固度影响不大,当拟薄水铝石含量为8%时,负载型蜂窝陶瓷的催化效果和涂覆效果最佳,可以在60℃下完全降解甲醛。 |
| 英文摘要: |
| Supported noble metal catalyst of superior catalytic performance was mixed with pseudoboehmite sol to obtain a homogeneous slurry, and the mixture was then coated on honeycomb ceramic substrate by the method of slurry coating. Effects of pseudoboehmite content were investigated on coating morphology, loading and coating robustness. The synthesized monolithic catalysts were tested for formaldehyde catalytic oxidation. Experimental results showed that the diameter of Pt particles on synthesized noble metal catalysts was ca. 1.14 nm, which could completely oxidize HCHO at 17°C. Higher content of pseudoboehmite resulted in larger loading during the coating process, but uneven coating and coating cracks would occur when the pseudoboehmite content was too high. Ultrasonic vibration tests showed that the proposed content of pseudoboehmite had little effects on the coating robustness. The coated honeycomb ceramics with 8% pseudoboehmite content gave the best catalytic and coating results, which could completely decompose formaldehyde at 60℃. |
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