Oil removal of spent hydrotreating catalyst CoMo/Al2O3 via a facile method with enhanced metal recovery

Yue Yang, Shengming Xu, Zhen Li, Jianlong Wang, Zhongwei Zhao, Zhenghe Xu

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Deoiling process is a key issue for recovering metal values from spent hydrotreating catalysts. The oils can be removed with organic solvents, but the industrialized application of this method is greatly hampered by the high cost and complex processes. Despite the roasting method is simple and low-cost, it generates hardest-to-recycle impurities (CoMoO4 or NiMoO4) and enormous toxic gases. In this study, a novel and facile approach to remove oils from the spent hydrotreating catalysts is developed. Firstly, surface properties of spent catalysts are characterized to reveal the possibility of oil removal. And then, oils are removed with water solution under the conditions of 90 °C, 0.1 wt% SDS, 2.0 wt% NaOH and 10 ml/g L/S ratio for 4 h. Finally, thermal treatment and leaching tests are carried out to further explore the advantages of oil removal. The results show that no hardest-to-recycle impurity CoMoO4 is found in XPS spectra of thermally treated samples after deoiling and molybdenum is leached completely with sodium carbonate solution. It means that the proposed deoiling method can not only remove oils simply and without enormous harmful gases generating, but also avoid the generation of detrimental impurity and promote recycling of valuable metals from spent hydrotreating catalysts.
Original languageEnglish (US)
Pages (from-to)723-731
Number of pages9
JournalJournal of hazardous materials
Volume318
DOIs
StatePublished - Nov 15 2016
Externally publishedYes

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