Formation of vanadia-titania oxide catalysts

In situ FTIR study of transformation of 3-cyanopyridine on V–Ti–O catalyst

“…A sample containing 20 wt% of V 2 O 5 and 80 wt% of TiO 2 was prepared by mixing a solution of vanadium oxalate with TiO 2 (anatase) followed by its drying and calcination at 400°C in air for 4 h [2]. The catalyst surface area was 100 m 2 /g.…”

“…The catalyst surface area was 100 m 2 /g. The catalyst consisted of octahedrally coordinated vanadium species bound to TiO 2 [2]. TiO 2 was prepared by the sulfate process, which yields a higher surface area and a higher amount of Brönsted acid sites (B.a.s.)…”

Microwave assisted heterogeneous vapor-phase oxidation of 3-picoline to nicotinic acid over vanadium–titanium oxide catalytic system

“…2. Existence of two bulk phases is accompanied by formation of the coherent intergrowth boundaries between crystals of V 2 O 5 and TiO 2 (anatase modification) [6,17]. With the increase in the vanadium content, the microstructure of the catalysts becomes more complicated: strips of V 2 O 5 and TiO 2 phases alternate within one single catalyst particle of ca.…”

“…Hence, the coherent interface without any elastic stress appears between two oxide phases. According to microanalytical study [17], the ratio of vanadium and titanium in the interface is 1:1. …”

“…Binary V Ti O catalysts were prepared by spray drying of a mixture of titanium dioxide (anatase form) and vanadyl oxalate solution followed by calcination in a flowing air at 400-500 • C for 4 h. Vanadium oxide (99.9%, Sigma-Aldrich) was calcinated at 450 C for 4 h. A detailed description of catalysts preparation and characterization can be found in [16][17][18][19][20][21][22][23].…”