机械力化学作用对石油焦与CO_2催化气化特性的影响

EFFECT OF MECHANOCHEMICAL TREATMENT ON THE REACTIVITY OF PETROLEUM COKE-CO_2 CATALYTIC GASIFICATION

考察了球磨过程中机械力化学作用对石油焦与CO2催化气化特性的影响。结果表明,机械力作用后石油焦的气化活性显著提高;不论是非催化还是催化气化,湿磨活化的效果都好于干磨活化,而且湿磨可以使催化剂活性金属不易在气化中挥发损失,在较大转化率范围内都能维持较高的催化活性。机械力化学作用对石油焦气化活性的影响存在临界时间,湿磨时间少于2h时,石油焦趋于无定形化,气化活性提高;超过2h后,石油焦又会逐渐形成新的晶体结构,导致气化活性下降。

The effect of mechanochemical treatment during the grinding of petroleum coke on its gasification by CO2 was studied. Results showed that the gasification reactivity of petroleum coke was effectively improved after mechanochemical treatment. The activation by wet grinding was more noticeable than that by dry grinding for both non-catalytic and catalytic gasification. Moreover, in wet grinding, the active metal species in catalyst were not easily volatilized in gasification, keeping a high catalytic reactivity in most of the conversion range. There was a critical time for the improvement of gasification reactivity by mechanochemical treatment. In the first 2 h of wet grinding, a crystalline-amorphous phase transition of petroleum coke occurred, resulting in high gasification reactivity. However, a crystal structure re-formation stage was found with the grinding time of more than 2 h.