Structural evolution and catalytic performance of DuPont V-P-O/SiO₂ materials designed for fluidized bed applications

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• 作者：Nicholas F. Dummer ; Weihao Weng ; Carol Kiely ; Albert F. Carley ; Jonathan K. Bartley ; Christopher J. Kiely ; Graham J. Hutchings
• 关键词：V-P-O catalyst ; n-Butane oxidation ; Maleic anhydride ; XuM ; Silica shell
• 刊名：Applied Catalysis A: General
• 出版年：2010
• 出版时间：31 March 2010
• 年：2010
• 卷：376
• 期：1-2
• 页码：47-55
• 全文大小：3297 K

文摘

An industrial V-P-O catalyst (DuPont), comprising vanadyl pyrophosphate crystallites encapsulated by a silica shell, has been investigated. Reaction evaluation for butane oxidation was conducted over (i) the catalyst precursor, (ii) the calcined precursor and (iii) equilibrated material (2 years on-line) in a fixed-bed reactor. Characterization was conducted on these three samples by XRD, SEM, TEM and XPS. The core–shell particles have also been examined with a novel X-ray ultramicroscopy (XuM) technique which reveals the internal structure without having to section the material. The microstructural and surface compositional changes that have occurred over the course of its industrial lifespan in a fluidized bed reactor are correlated with the catalytic activity measurements.