摘要
This article investigated the deactivation caused by hydrothermal treatment and metal contamination of two cracking catalysts containing the Y and ZRP- 1 zeolites aimed at maximization of light olefin yield.Test results had shown that the hydrothermal stability and resistance to metal contamination of the ZRP-1zeolite were apparently better than those of the Y zeolite. Hydrothermal treatment and metal contamination had not only changed the catalytic cracking performance of respective zeolites, but at the same time had also modified to a definite degree of the relative proportions of effective components in these two zeolites and affected the synergistic effects between them, resulting in a relative enhancement of secondary cracking ability of the catalyst and increased olefin selectivity in the FCC products. In the course of application of catalyst for maximization of light olefins yield appropriate adjustment of the relative proportion of two active components can help to alleviate the products distribution and selectivity changes caused by deactivationof FCC catalysts.
This article investigated the deactivation caused by hydrothermal treatmentand metal contamination of two cracking catalysts containing the Y and ZRP-1 zeolites aimed atmaximization of light olefin yield.Test results had shown that the hydrothermal stability andresistance to metal contamination of the ZRP-1 zeolite were apparently better than those of the Yzeolite.Hydrothermal treatment and metal contamination had not only changed the catalytic crackingperformance of respective zeolites,but at the same time had also modified to a definite degree ofthe relative proportions of effective components in these two zeolites and affected the synergisticeffects between them,resulting in a relative enhancement of secondary cracking ability of thecatalyst and increased olefin selectivity in the FCC products.In the course of application ofcatalyst for maximization of light olefins yield appropriate adjustment of the relative proportionof two active components can help to alleviate the products distribution and selectivity changescaused by deactivation of FCC catalysts.
