A TiO₂-SiO₂ support, 90Ti-Si, containing 90 wt.% TiO₂ was synthesized by the sol-gel method. Several supported vanadium oxide (vanadia) catalysts, xV90Ti-Si (x = 2–12.5 wt.%) were synthesized by incipient wetness impregnation method using this support. The catalysts and support were characterized and probed with the propane oxidative dehydrogenation (ODH) reaction. The support possesses no rutile phase and retains 30–40% of its initial surface area even after calcination at 1073 K. The surface area loss is accelerated in the presence of vanadia and the rutile phase appears below 1073 K. Surface vanadia species are present for the supported vanadia catalysts calcined at 673 K and the propane ODH activity and propene yield increases with vanadia loading. The ODH activity of the 2V90Ti-Si sample at 673 K is retained even after the catalyst is pre-calcined at 1023 K. Interestingly, the activity of the 4V90Ti-Si sample at 673 K reaches a maximum at an intermediate pre-calcination temperature. The higher vanadia loading samples deactivate with an increase in calcination temperature. The ODH reactivity reveals that the propene yield at iso-conversion increases with loading. Analysis of kinetic parameters also reveals that the rate constant ratio increases with vanadia loading.

包含90 wt。％TiO _2的TiO ₂ -SiO ₂载体90Ti-Si通过溶胶-凝胶法合成。通过使用该载体的初期湿润浸渍法，合成了几种负载型氧化钒（钒）催化剂xV90Ti-Si（x = 2–12.5 wt。％）。表征催化剂和载体，并用丙烷氧化脱氢（ODH）反应进行探测。该载体不具有金红石相，即使在1073 K下煅烧后仍保留其初始表面积的30％至40％。在存在钒的情况下，表面积损失加快，金红石相出现在1073 K以下。负载的钒催化剂在673 K下煅烧，丙烷ODH活性和丙烯收率随钒载量的增加而增加。即使在1023 K下将催化剂预煅烧后，仍可保留2V90Ti-Si样品在673 K下的ODH活性。在中间预煅烧温度下，4V90Ti-Si样品的673 K活性达到最大值。钒含量较高的样品会随着煅烧温度的升高而失活。ODH反应性表明，等负载量的丙烯收率随负载增加而增加。动力学参数的分析还表明速率常数比随钒含量的增加而增加。