The present investigation is focused on improving the performance of molybdenum dioxide (MoO₂) by doping with Ti for the partial oxidation (POX) of n-dodecane. Ti-doped MoO₂ nanoparticles were synthesized via solvothermal cracking of polycrystalline MoO₃ microparticles prepared by ultrasonic spray pyrolysis in the presence of a Ti precursor. Partial oxidation of n-dodecane was conducted at 850 °C with an O₂/C ratio of 0.5. The 6 at% Ti-doped MoO₂ was fully converted into orthorhombic carbide phase (β-Mo₂C) during the reaction. This carbide sample showed high catalytic activity and stability with conversion and H₂ yield of 94.4% and 86.3% after 24 h on stream, respectively. On the other hand, un-doped MoO₂ was partially converted into the carbide phase during the reaction, which led to mixed oxide and carbide phases. This mixed phase showed poor catalytic activity and rapid deactivation after only 6 h of operation. Our ammonia temperature programmed desorption (TPD) and pyridine diffuse reflectance infrared Fourier transform (DRIFT) tests suggest that the addition of Ti to MoO₂ improves both the density and strength of Lewis acid sites, and hence improves hydrocarbon activation. This increased surface carbon activation would enhance the carburization process of the Ti-doped MoO₂ catalyst and retain the carbide phase under the POX condition.

本研究的重点是通过掺杂Ti对正十二烷的部分氧化（POX）来提高二氧化钼（MoO ₂）的性能。通过在Ti前体的存在下通过超声喷雾热解制备的多晶MoO ₃微粒的溶剂热裂解来合成Ti掺杂的MoO ₂纳米微粒。正十二烷的部分氧化在850°C下进行，O ₂ / C比为0.5。6原子％Ti掺杂的MoO ₂被完全转化为斜方晶碳化物相（β-沫₂在反应期间C）。该碳化物样品显示出高催化活性和对转化率和H _2的稳定性运转24小时后，产率分别为94.4％和86.3％。另一方面，未掺杂的MoO ₂在反应过程中部分转化为碳化物相，这导致了氧化物和碳化物相的混合。仅运行6小时后，该混合相显示出较差的催化活性和快速失活。我们的氨程序升温脱附（TPD）和吡啶漫反射红外傅里叶变换（DRIFT）测试表明，向MoO _2中添加Ti可以提高路易斯酸位的密度和强度，从而改善烃的活化。这种增加的表面碳活化将增强掺杂Ti的MoO ₂催化剂的渗碳过程，并在POX条件下保留碳化物相。