TY - JOUR
T1 - Closing the Waste Loop
T2 - A Sustainable Process of Extracting Lanthanum, Mullite, Silica, and Alumina from Spent Fluidized Cracking Catalysts
AU - Shetty, Rohit R.
AU - Tay, Boon Ying
AU - Goh, Wayne
AU - Min, Shixiong
AU - Tan, Davin
AU - Ye, Suming
AU - Bu, Jie
AU - Huang, Kuo Wei
AU - Hengne, Amol M.
N1 - Publisher Copyright:
© 2025 American Chemical Society.
PY - 2025/2/26
Y1 - 2025/2/26
N2 - A sustainable process for the utilization of spent fluid catalytic cracking (FCC) to the rare earth element (REE) lanthanum, silica (SiO2), alumina (Al2O3), and mullite has been developed. The solid catalyst waste obtained from refineries is generally dumped into landfills, which subsequently creates not only land claiming but also environmental concerns related to air and water pollution. Here, the developed process involves acid/base leaching followed by selective precipitation. Also, it involves the recovery of silica using CO2 precipitation under atmospheric conditions and finally the recovery of solid alumina using recycled acid and base solutions, which generates CO2 for the next cycle. The obtained solution mainly contains a metal salt; the base metal hydroxide can be regenerated using calcium hydroxide treatment. This indicates no solid landfill material, a CO2-neutral process, zero waste, and no wastewater.
AB - A sustainable process for the utilization of spent fluid catalytic cracking (FCC) to the rare earth element (REE) lanthanum, silica (SiO2), alumina (Al2O3), and mullite has been developed. The solid catalyst waste obtained from refineries is generally dumped into landfills, which subsequently creates not only land claiming but also environmental concerns related to air and water pollution. Here, the developed process involves acid/base leaching followed by selective precipitation. Also, it involves the recovery of silica using CO2 precipitation under atmospheric conditions and finally the recovery of solid alumina using recycled acid and base solutions, which generates CO2 for the next cycle. The obtained solution mainly contains a metal salt; the base metal hydroxide can be regenerated using calcium hydroxide treatment. This indicates no solid landfill material, a CO2-neutral process, zero waste, and no wastewater.
UR - http://www.scopus.com/inward/record.url?scp=85217733476&partnerID=8YFLogxK
U2 - 10.1021/acs.iecr.4c04053
DO - 10.1021/acs.iecr.4c04053
M3 - Article
AN - SCOPUS:85217733476
SN - 0888-5885
VL - 64
SP - 4250
EP - 4259
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 8
ER -
