Re: Extensive Pelvic Malacoplakia: Observations on Management, by P. N. Matthews, R. N. Greenwood, W. F. Hendry and W. R. Cattell, J. Urol., 135: 132–134, 1986

Resource‐Efficient Alkane Selective Oxidation on New Crystalline Solids: Searching for Novel Catalyst Materials

“…The crystal structure of the new vanadium borate phosphate (V IV O) 2 4 ] is closely related to that of a I -V V OPO 4 (Fig. 3c and d) with a doubled c-axis.…”

“…3). Samples of (V IV O) 2 [B(OH) 4 ][PO 4 ] for catalytic testing were synthesized hydrothermally. For this purpose a mixture of VO 2 , BPO 4 and water (total weight 26 g, molar ratio 1:2:77) was filled into a teflon autoclave (V = 50 mL; filling degree 50 %) and heated at 170°C for five days.…”

“…The product was separated from the mother liquor by vacuum filtration, washed with water and dried at 60°C. Thermo-gravimetric studies of (V IV O) 2 5 ], which is isotypic to Fe III [B 2 P 2 O 7 (OH) 5 ] according to its XRPD pattern [41]. Its crystal structure (cf.…”

“…2). Cat-3, (V IV O) 2 [46,47]. The dihydrate and the a I -phase show similar chemical shifts in 31 P-MAS-NMR and are difficult to distinguish.…”

“…First reports on the use of vanadium phosphorus oxide (VPO) catalysts for the selective oxidation of butane can be traced back to 1966 when Bergman and Frisch reported maleic anhydride yields of up to 31 mol % at reaction temperatures of 550°C [2]. Optimization of the catalyst composition and synthesis in combination with advances in process engineering allowed further improvement of maleic anhydride yields to 55 -60 mol % [3].…”