活化气氛对钒磷氧催化剂物性的影响

EFFECTS OF ACTIVATION ATMOSPHERE ON THE PHYSICAL PROPERTIES OF VPO CATALYSTS

关键词:  活化气氛 钒磷氧催化剂 物性 影响 VOP催化剂

Key words:  activation atmosphere, VPO catalysts, physical properties

摘要:

采用超临界流体干燥法制备VPO催化剂，并在N2气氛或反应气氛（1．5％n-C4H10/17.0%O2/N2,体积比）下进行活化，应用BET、XRD、XPS等表征手段，考察了各VPO催化剂粒子的比表面积、晶相结合、表面性质。实验表明，活化气氛不同，对催化剂物理性质影响也不同。在N2气氛中活化的样品比表面积大于反应气氛中活化的样品；活化气氛对催化剂的晶相组成影响不大；在N2气氛中活化的样品V的2p电子结合能较反应气氛中活化有所降低，但表面P／V原子比却有所提高。

Abstract:

VPO catalysts were prepared by the supercritical fluid drying (SCFD) and were activated in the reactant mixture or in nitrogen after SCFD. BET, XRD and XPS techniques were used to investigate the surface area, the phase composition and the oxidation state