Efficient Synthesis of Rare-earth-based KFI from Spent Fluid Catalytic Cracking Catalyst

doi:10.1007/s40242-026-6065-5

Abstract

Abstract: Cu-KFI zeolite with 8-membered rings has been recognized as a highly promising catalyst for the ammonia selective catalytic reduction (NH₃-SCR), but the Al-rich feature for this zeolite strongly influences its hydrothermal stability. One of the effective strategies for solving this issue is to introduce rare earth elements in the zeolite. Herein, we showed an efficient synthesis of LaCe-KFI zeolite from a spent fluid catalytic cracking (FCC) catalyst containing La and Ce species as the raw material under solventfree conditions. Interestingly, the introduction of rare-earth elements in KFI zeolite could maintain the stability of active copper species and zeolite framework under hydrothermal aging conditions at 800 ℃ for 12 h, resulting in excellent hydrothermal stability and superior catalytic performance in NH₃-SCR reaction. This novel method for zeolite production not only boosts catalytic efficiency but also facilitates the sustainable recycling of industrial solid waste, in good agreement with the tenets of green chemistry.

Key words: KFI zeolite, Efficient synthesis, Rare-earth, Ammonia selective catalytic reduction (NH₃-SCR), Spent fluid catalytic cracking catalyst, Solvent-free

GUAN Linjie, LIU Pei, WU Qinming, XIAO Feng-Shou. Efficient Synthesis of Rare-earth-based KFI from Spent Fluid Catalytic Cracking Catalyst[J]. Chemical Research in Chinese Universities, 2026, 42(4): 1245-1250.

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