Physicochemical properties of vanadia/MCM-41 catalysts and their catalytic activity in oxidative dehydrogenation of propane
- Physicochemical properties of vanadia/MCM-41 catalysts and their catalytic activity in oxidative dehydrogenation of propane
- 안인영; 서영웅; 윤지선; Stanislaw Dzwigaj; Yannick Millot; Frederic Averseng; 서동진
- Vanadia; MCM-41; Catalyst; Oxidative dehydrogenation; Propane
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- Diffuse reflectance (DR) UV-vis and 51V MAS NMR investigations showed that mainly isolated tetrahedral and/or octahedral V(V) species were present in V/MCM-41 catalysts. However, EPR investigations performed at 25 and −196 °C evidenced that V(IV) species also appeared in all V/MCM-41 catalysts mainly as stable and isolated VO2+ species. Contrary to V/MCM-41 catalysts with low vanadium contents, the catalysts containing 15 wt % vanadia suffered from drastic decrease in specific surface area and total pore volume due to the collapse and blocking of pores, which was detrimental to catalytic performance.
Particularly, isolated tetrahedral V(V) species was present in the largest amount on the 5V/MCM-41 catalyst, resulting in the highest propylene yield as shown in Fig. 2. With increasing the vanadium content, isolated mononuclear and polynuclear vanadium species simultaneously existed on 10V/MCM-41, as shown by DR UV-vis, 51V MAS NMR and EPR. At 15 wt % of vanadia content, the very low activity and propylene yield were obtained due to the presence of high amount of polynuclear vanadium species and probably some amount of vanadium oxide.
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