Oxidative dehydrogenation of n-butane over LaV catalysts supported on TiO2

The catalytic performance of vanadia catalysts with 15 wt% v supported on tio2 and (15 wt% v + 4.6 wt% la) supported on tio2 in oxidative dehydrogenation (odh) of n-butane was investigated. the catalysts were characterized by means of tpd-nh3,tpr-h2,uv-vis,and bet. testing of samples showed that vanadia catalysts were active for the reaction. it was found that la doping of v/tio2 catalyst had a negative effect on the dispersion of v species and led to formation of v 2o5 clusters. this resulted in a loss of activity. although slight improvement of selectivity was observed in comparison to undoped v/tio2 samples due to lower acidity of la-doped -v/tio2,this could not compensate the loss of activity and finally did not lead to higher butene yields. © 2013 le minh cam et al.