Zhang Shihao, Xin Baoping
School of Materials Sciences and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.
Tangshan Research Institute, Beijing Institute of Technology, Tangshan 063000, P. R. China.
ACS Omega. 2025 Apr 9;10(15):15563-15571. doi: 10.1021/acsomega.5c00629. eCollection 2025 Apr 22.
Fluid catalytic cracking (FCC) catalysts play an important role in modern industrial production and are capable of converting heavy oils into light oils. However, in the process of long-term use, the FCC catalyst will reduce its activity due to internal wear and external factors, and it will become a spent catalyst after failing to meet the requirements of use. Approximately one million tons of spent FCC catalysts are generated annually, and improper disposal of this hazardous waste can pose significant harm. In this study, the spent catalyst is treated by the bioleaching method, which restored its activity to some extent, allowing for its reuse in industrial production. This study found that at 58 °C, the biological cleaning of spent catalyst with 5.6% pulp density can increase its activity by about 10%, whereas the corresponding treatment with a mixed acid only achieved a 2% increase. This demonstrates the feasibility of the bioleaching method and provides insights into further enhancing the activity of spent catalysts.
流化催化裂化（FCC）催化剂在现代工业生产中发挥着重要作用，能够将重油转化为轻油。然而，在长期使用过程中，FCC催化剂会由于内部磨损和外部因素而降低其活性，在不符合使用要求后就会成为废催化剂。每年大约产生100万吨废FCC催化剂，对这种危险废物的不当处置会造成重大危害。在本研究中，采用生物浸出法对废催化剂进行处理，在一定程度上恢复了其活性，使其能够在工业生产中再次使用。本研究发现，在58℃下，纸浆密度为5.6%时对废催化剂进行生物清洗可使其活性提高约10%，而用混合酸进行相应处理仅使活性提高了2%。这证明了生物浸出法的可行性，并为进一步提高废催化剂的活性提供了思路。
