嵌入Y型沸石中Pd簇的合成及其催化性能

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

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XPS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240C和还原温度210C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，在空速2000h－1及室温的反应条件下，CO氧化的转化率即可达100％．因此，嵌入Pd簇后的Y型沸石是极好的低温CO氧化催化剂．

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.