担载Na、W、Mn的(001)SiO_2单晶模型催化剂的SEM研究一多组分Na、W、Mn的分布形态及其在SiO_2基体中的扩散行为

SEM study on model catalysts of (001) SiO_2 single crystal supported by Na,W,and Mn The morphology and diffusion behavior of Na,W,Mn multi\|component over SiO_2

用浸渍法制备了担载多组分Na、W、Mn的(001)SiO2单晶模型催化剂,并进行了XPS和SEM表征。研究结果表明,Na、W、Mn的多元组合使SiO2转变为SiO32-能力的大小顺序依次为WMn>NaWMn>NaMn>NaW,它们在SiO2表面的形态各不相同,并且在SiO2基体中的扩散程度比单组分强,表明它们之间可能存在着某种相互促进向SiO2基体中扩散的协同效应。

The SiO\-2(001) crystal model catalysts supported by Na,W and Mn have been prepared by means of the impregnation method.The structures and the surface morphologies of the model catalysts have been characterized by using XPS and SEM.The experimental results indicate that the capability of Na,W and Mn multi\|component,for transforming crystal SiO\-2 into SiO\-3 2- ,is W\|Mn>Na\|W\|Mn>Na\|Mn>Na\|W in order.The surface morphologies of the model catalysts supported by Na,W and Mn are different.The diffusion of Na,W,and Mn in the multi\|component catalysts into crystal SiO\-2(001) substrate is stronger than that of their mono\|component.There is a cooperative effect among the Na,W and Mn components to promote their diffusion. 