Crystal Imperfections of Industrial Vanadium Phosphorous Oxide Catalysts

This study presents information about crystal imperfections in the main phase of industrial vanadium phosphorous oxide catalysts that are used to catalyze oxidation n-butane maleic anhydride, being an important intermediate chemical industry. The mechanism this reaction is still debated, and catalytically active selective surface centers have not yet been identified. results presented based on X-ray diffraction data obtained by both laboratory-scale synchrotron powder experiments, as well single-crystal experiments. It has proven pronounced Bragg reflection broadening effects found patterns VPO real due insufficient 2-? resolution apparatus. In framework work, a full profile fitting strategy was developed using TOPAS software, which applied analyze four differently activated catalyst samples, originating from one batch after they had tested. mainly caused anisotropic size, platelet-shaped crystallites vanadyl pyrophosphate. A further contribution reflex broadening, especially for (111), be result stacking faults perpendicular direction structure These were elaborate possible correlations between structural proxies catalytic performance. direct correlation extension coherently scattering domains z catalyst’s selectivity could proven, whereas activity turned out dependent crystallite shape. Regarding contents, it shown sample containing higher amount ?-VO(PO3)2 showed increased activity.