改性VOx/MSU-1催化剂上CO2氧化异丁烷脱氢反应

Oxidative Dehydrogenation of Isobutane with CO2 Catalyzed by Modified VOx/MSU-1 Catalysts

摘要:

以MSU-1为载体制备了一系列改性的VOx/MSU-1催化剂，并在CO2氧化异丁烷脱氢制异丁烯的反应中评价了催化剂的性能，发现稀土元素La、Ce的加入能提高催化剂的活性。采用XRD、H2-TPR及NH3-TPD方法对催化剂La2O3-VOx/MSU-1进行了深入的表征，发现La2O3的加入提高了载体MSU-1上活性组分VOx的分散度，同时也改善了催化剂表面的酸碱性，更加有利于异丁烷氧化脱氢反应的进行。优化了反应条件，在最佳反应条件下，异丁烷的转化率为63.6%，异丁烯的产率为52.3%。最后，通过8 h的稳定性实验，发现与VOx/MSU-1相比，催化剂La2O3-VOx/MSU-1具有更好的催化稳定性。

Abstract:

A series of modified VOx/MSU-1 catalysts were prepared using MSU-1 as the supports, and then were used to catalyze the oxidative dehydrogenation of isobutane to isobutene with CO2. The reaction results showed that the addition of La or Ce could increase the catalytic activity of VOx/MSU-1. La2O3-VOx/MSU-1 was systematically characterized by XRD, H2-TPR and NH3-TPD methods and it was found that the La2O3 addition could improve not only the dispersion of VOx species, active components, over MSU-1 support but also the acid-base properties of catalysts surface, which was favorable to the oxidative dehydrogenation of isobutane. The optimal reaciton conditions were obtained, under which isobutane conversion was 63.6% and isobutene yield was 52.3%. At last, It was demonstrated by the stability experiments of 8 h that La2O3-VOx/MSU-1 possessed higher catalytic stability than VOx/MSU-1.