XPS surface analysis of V-P mixed oxide catalysts for the selective oxidation of butane.

One-Pot Synthesis of VOHPO4·0.5H2O with High Growth of the (001) Plane: An Important Catalyst Precursor of (VO)2P2O7

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In addition, the (100) plane of (VO) 2 P 2 O 7 , which is an active plane for the selective oxidation, 2,3,7,8,11,13 originates from the (001) plane of VO-HPO 4 ‚0.5H 2 O. [23][24][25] To date, four methods have been reported for the preparation of VOHPO 4 ‚0.5H 2 O: (1) the reduction of V 2 O 5 with alcohols followed by reaction with H 3 -PO 4 , [1][2][3][4]8,12,[14][15][16]21,22,[26][27][28] (2) the reaction of a mixture of V 2 O 5 and H 3 PO 4 with NH 2 OH‚HCl or oxalic acid followed by heat treatment at 403 K, 1,3,5,10,12,25,26,…”

“…8,21,22 Therefore, the easy synthesis of VOHPO 4 ‚0.5H 2 O with a high growth of the (001) plane is interesting from the standpoint of catalyst preparation. [23][24][25] To date, four methods have been reported for the preparation of VOHPO 4 ‚0.5H 2 O: (1) the reduction of V 2 O 5 with alcohols followed by reaction with H 3 -PO 4 , [1][2][3][4]8,12,[14][15][16]21,22,[26][27][28] (2) the reaction of a mixture of V 2 O 5 and H 3 PO 4 with NH 2 OH‚HCl or oxalic acid followed by heat treatment at 403 K, 1,3,5,10,12,25,26,29 (3) the preparation of VOPO 4 ‚2H 2 O followed by reduction with alcohols, 3,8,12,13,21,22,30 and (4) hydrothermal synthesis with V 2 O 4 and H 3 PO 4 at 773 K. 31 Methods 1-3 consist of two steps and method 4 requires a high temperature of 773 K. [23][24][25] To date, four methods have been reported for the preparation of VOHPO 4 ‚0.5H 2 O: (1) the reduction of V 2 O 5 with alcohols followed by reaction with H 3 -PO 4 , [1][2][3][4]8,12,…”

“…VOHPO 4 ·0.5H 2 O is a good catalyst precursor of (VO) 2 P 2 O 7 , which is an active phase or active component for the industrialized oxidation of n -butane into maleic anhydride. − In addition, the (100) plane of (VO) 2 P 2 O 7 , which is an active plane for the selective oxidation, ,,,,, originates from the (001) plane of VOHPO 4 ·0.5H 2 O. ,, Therefore, the easy synthesis of VOHPO 4 ·0.5H 2 O with a high growth of the (001) plane is interesting from the standpoint of catalyst preparation. VOHPO 4 ·0.5H 2 O is also a catalyst precursor of (NH 4 ) 2 [(VO) 3 (P 2 O 7 ) 2 ] active for ammoxidation. − …”

“…VOHPO 4 ‚0.5H 2 O is also a catalyst precursor of (NH 4 ) 2 [(VO) 3 (P 2 O 7 ) 2 ] active for ammoxidation. [23][24][25] To date, four methods have been reported for the preparation of VOHPO 4 ‚0.5H 2 O: (1) the reduction of V 2 O 5 with alcohols followed by reaction with H 3 -PO 4 , [1][2][3][4]8,12,[14][15][16]21,22,[26][27][28] (2) the reaction of a mixture of V 2 O 5 and H 3 PO 4 with NH 2 OH‚HCl or oxalic acid followed by heat treatment at 403 K, 1,3,5,10,12,25,26,29 (3) the preparation of VOPO 4 ‚2H 2 O followed by reduction with alcohols, 3,8,12,13,21,22,30 and (4) hydrothermal synthesis with V 2 O 4 and H 3 PO 4 at 773 K. 31 Methods 1-3 consist of two steps and method 4 requires a high temperature of 773 K.…”