Oxidative regeneration of spent molybdate and tungstate hydrotreating catalysts
Oxidative regeneration of spent molybdate and tungstate hydrotreating catalysts
复制标题
废钼酸盐和钨酸盐加氢处理催化剂的氧化再生
DOI：
10.1021/ef00044a023
复制
发表时间：
1994
期刊：
影响因子：
5.3
通讯作者：
H. Yanase
中科院分区：
文献类型：
--
作者：
Y. Yoshimura;Takafumi Sato;H. Shimada;N. Matsubayashi;M. Imamura;A. Nishijima;S. Yoshitomi;T. Kameoka;H. Yanase
在热重法和固定床反应器中对减压蜡油和煤制油加氢精制的NiMo、CoMo和NiW加氢精制催化剂进行了程序升温氧化。试图阐明氧化脱除废催化剂中碳和硫的机理，并研究再生过程中活性金属的结构变化以及活性金属与熔敷金属之间的某些固相相互作用，以便将这些性质与再生催化剂的催化活性相关联。用EXAFS和XPS分析了负载金属的化学状态和结构的变化。用热力学相图对这些结构变化进行了分析。这场演讲将讨论钼和钨废催化剂氧化再生严重程度的差异，载体金属在氧化和硫化过程中的结构变化，以及热力学对预先预测再生和随后硫化行为的有效性。
Temperature-programmed oxidation of NiMo, CoMo and NiW hydrotreating catalysts from hydrotreatment of vacuum gas oil and coal-derived oils was carried out in thermogravimetric and fixed-bed reactors. Attempts were made to elucidate the mechanism of oxidative removal of carbon and sulfur from spent catalysts, and to investigate the structural changes of active metals and some solid-phase interactions between active metals and deposited metals during regeneration in order to correlate these resulting properties with the catalytic activities of regenerated catalysts. Changes in chemical states and structure of supported metals were analyzed by EXAFS and XPS. These structural changes were also analyzed by using the thermodynamical phase diagrams. This talk will discuss the differences in the oxidative regeneration severity between Mo and W spent catalysts, structural changes of supported metals during oxidation and following sulfidation, and effectiveness of the thermodynamics to predict a priori the regeneration and following sulfidation behavior.