钴钼硫化物催化剂的机械强度优化

Optimization of the Mechanical Strength of a PCoMo/Al_2O_3 Hydrotreating Catalyst

应用响应面方法论建立了PCoMo/Al2 O3加氢催化剂机械强度及其可靠性在浸渍、干燥、煅烧和硫化过程中的数学模型 ,采用中心复合旋转设计、中心复合正交设计和Doehlert设计分别考察了各过程中主要因素对催化剂强度均值、Weibull模量和颗粒密度的影响。结果表明 ,浸渍、干燥、煅烧和硫化均是影响催化剂强度及可靠性的重要过程。煅烧过程总是有利于提高强度及可靠性。催化剂颗粒密度只与浸渍和干燥过程有关 ,而与煅烧和硫化过程无关。钴钼催化剂的机械强度及可靠性的生产过程优化具有巨大潜力 ;

Mathematical models for the mechanical properties of a PCoMo/Al 2O 3 hydrotreating catalyst in the impregnation, drying, calcination and sulfidation processes were developed using a response surface methodology. The central composite rotatable design, central composite orthogonal design and Doehlert design were performed to study simultaneously the effects of the process parameters on the mean strength, Weibull modulus and pellet density. Results reveal that the impregnation, drying, calcination and sulfidation are all important processes for the mechanical strength and reliability. The calcination is of great advantage to the mechanical properties. There is a great potential in increasing the mechanical properties of the catalyst by monitoring its production processes. The pellet density is only dependent on the impregnation and drying, but independent on the calcination and sulfidation. It is also concluded that the response surface methodology is an effective technique for the factor analyses and process optimizations of the mechanical properties of solid catalysts.