Abstract This work focuses on the reactivation of fluid catalytic cracking (FCC) catalyst via mixed acid to leach out pollutant Ni and Fe oxides and reserve acidic sites provider Al2O3 in zeolite. The micro-structure, morphology and chemical composition of reactivated catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray analysis (EDXA), respectively. The change of micro-structure and catalytic performance of the catalyst after reactivation were discussed. The blocked micro- and meso-pores in the spent catalyst are opened by acid leaching, and the specific surface area is doubled, which is close to that of fresh catalyst. The catalytic performance of the reactivated catalyst is evaluated in heavy oil micro-reactor. It results in 6.3% increase of conversion than the spent catalyst, and 2.31% increase of gasoline yield and 11.60% increase of diesel yield. This method for spent FCC catalyst reactivation has strong practicability and is of great significance for environment protection and resources recycling.

中文翻译：

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用混酸浸出再生废 FCC 催化剂以实现高效催化裂化

摘要 这项工作的重点是通过混合酸对流化催化裂化 (FCC) 催化剂进行再活化，以浸出污染物 Ni 和 Fe 氧化物，并在沸石中保留酸性位提供者 Al2O3。分别通过X射线衍射（XRD）、扫描电子显微镜（SEM）和能量色散X射线分析（EDXA）表征了再活化催化剂的微观结构、形貌和化学成分。讨论了催化剂再活化后微观结构和催化性能的变化。废催化剂中堵塞的微孔和中孔通过酸浸打开，比表面积增加一倍，接近新鲜催化剂。在重油微反应器中评价了再活化催化剂的催化性能。与废催化剂相比，转化率提高了 6.3%，汽油收率提高2.31%，柴油收率提高11.60%。这种FCC废催化剂再活化方法具有很强的实用性，对环境保护和资源循环利用具有重要意义。