【摘要】 <正> 负载型钼系催化剂广泛用于加氢脱硫、抗硫甲烷化及部分氧化等,其加氢脱硫活性与低温氧的表面吸附量成正比,活性组分受载体性质的影响。超细粒子是近年来兴起的新型催化材料,由于其表面及体积效应,导致其特殊的表面吸附性能。以超临界法合成NiO/Al₂O₃、Fe₂O₃/SiO₂等超细催化剂已有报道,但该法对MoO₃/Al₂O₃的合成尚未见报道。本文以MoO₃/Al₂O₃超临界法合成超细粒子催化剂,根据超细催化剂分散性与粒径的关系选择了活性与钼表面分散性有依赖关系的临氢重整反应为探针,研究了超细MoO₃/Al₂O₃催化剂的性质。更多还原

【Abstract】 In this paper, the supported MoO3/Al2O3 ultrafine catalysts have been synthesized with the supercritical drying method. The n-heptane reforming reaction has been used as a model reaction, the different qualities between the ultrafine and the conventional catalysts have been discussed, the ultrafine MoO3/Al2O3 catalysts have more stability than the conventional catalysts, this is because there are much more strong reactions between the active component and support as well as less volatility of active component. The ultrafine catalysts have less cracking conversion and selectivity, this is because there are weak acid centers on the Al2O3 surface.更多还原