Recovery and regeneration preparation of aluminum-based spent catalyst support
Aluminum-based catalyst is the most demanding and widely used catalyst in petroleum refining industry.The comprehensive economic benefits of industrial catalytic process can be greatly improved by recycling the discarded aluminum-based spent catalyst support that can not be used any more.In this study,the aluminum support from spent Pt-Sn/Al2O3 catalyst was recovered by"sodium roasting-weak alkaline leaching"to obtain NaAlO2 solution,and NaAlO2 was prepared into mesoporous alumina with high specific surface area and large pore volume by reverse precipitation.By changing the parameters such as roasting temperature,mass ratio of raw materials and leaching pH,the leaching rate of aluminum was optimized.Under the conditions of roasting temperature of 450℃,mass ratio of 1.2 and leaching pH of 8.5,the leaching rate of aluminum could reach 99.9％.Mesoporous alumina was prepared from recovered NaAlO2 solution,and prepared samples were characterized by X-ray diffraction(XRD),Brunner-Emmet-Teller(BET)and particle size analyzer.The results show that under the conditions of calcination temperature of 500℃,aging time of 12h and reaction pH of 10,the specific surface area of mesoporous alumina synthesized is 284.19m2/g,the pore volume is 0.47cm3/g,and the average pore diameter is 6.65nm.The pore size distribution is uniform and the particle uniformity is good.The specific surface area and particle size of the regenerated alumina meet the national standard of alumina(GB/T24487-2022).
catalyst supportweak alkaline leachingNaAlO2inverse precipitation methodregenerationaluminaphysical and chemical index regulation
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