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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.
Pd clusters embedded in Y zeolite were synthesized by microwave exchange-hydrogen reduction using [Pd (NH3) 4] (NO3) 2 · H2O as the ion exchange precursor. The results of XRD and XPS indicate that the temperature of the calcination stage is the main factor affecting the formation of Pd clusters in the zeolite during the synthesis. Under the conditions of calcination temperature 240C and reduction temperature 210C, the content of Pd is up to 6.13% (mass fraction), and it can enter the bulk of Y-type zeolite to form Pd clusters. Under the same conditions, a sample with Pd content of only 0.410% (mass fraction) was obtained. Under the reaction conditions of space velocity 2000h-1 and room temperature, the conversion of CO oxidation could reach 100%. Therefore, the Y-type zeolite embedded with Pd clusters is an excellent low-temperature CO oxidation catalyst.