嵌入Y型沸石中Pd簇的合成及其催化性能

以［Ｐｄ（ＮＨ３）４］（ＮＯ３）２·Ｈ２Ｏ作为离子交换前驱物，应用微波交换－氢还原法合成了嵌入Ｙ型沸石中的Ｐｄ簇合物。ＸＲＤ和ＰＸＳ测试结果表明，在合成过程中，焙烧阶段的温度是影响Ｐｄ原子进入沸石体相形成Ｐｄ簇的主要因素。在焙烧温度２４０℃和还原温度２１０℃的制备条件下，Ｐｄ含量高达６．１３％（质量分数）也能进入Ｙ型沸石体相形成Ｐｄ簇。在相同条件下制得Ｐｄ含量仅为０．４１０％（质量分数）的样品，在

The Synthesis and Catalytic Performance of Pd Cluster Encaged in Y-type Zeolite

The palladium cluster encaged in Y-type zeolite has been synthesized by the method of microwave radiation ion exchange-hydrogen reduction with Pd (NH3)4](NO3).H2O as precursor of ion exchange. The results of XRD and XPS show that calcination tem-perature has an important influence on the Pd atoms encaging into zeolite NaY and the for-mation of Pd clusters. When the Pd content in zeolite Y is 6.13%, Pd can be also encaged in zeolite Y and form cluster under the condition of preparation at 240 C of calcination temper-ature and 210 C of reduction temperature. Using the sample of Pd content 0.410% obtained under the same conditions, the conversion on CO complete oxidation is 100% at room tem-perature and at 2 000 h-1 (space velocity). Therefor, Pd cluster encaged Y-type zeolite is an excellent catalyst for complete oxidation of carbon monoxide.