Selective removal of ligand in bi-linker MIL-125 by pyrolysis method to improve the oxidative desulfurization

Journal:Fuel

Key Words:MIL-125 Bi-linker Pyrolysis treatment Oxidative desulfurization Ti-OOH

Abstract:Oxidative desulfurization (ODS) has garnered significant interest for its environmentally benign process. Metalorganic frameworks (MOFs) with active sites and tunable structures show promise for sulfur oxidation. A pyrolysis strategy targeting MIL-125 was devised to enhance active sites and create additional mesopores by selectively removing thermally unstable ligands. The synthesized MIL-125-NH2 (10 %) treated by pyrolysis at 250 ◦C for 3 h achieved complete DBT removal from the model oil in 8 min and 96.8 % BT conversion in 15 min. This work systematically examined the structure–activity relationship and found that MOF catalysts with poor crystallinity were kinetically preferred due to their abundant active sites and hierarchical pores. Mechanistic studies identified Ti-OOH as the active group responsible for sulfur oxidation, offering new insights into the ODS system. The pyrolysis strategy is anticipated to provide a straightforward approach to developing various defective MOFs with hierarchical pores and high activity for broad application.

Co-author:Junzhen Guo,Liang Chu,Haibin Yang,Liyan Wang,Zhaokun Wang,Zhaohui Liu

First Author:Zhi Huang

Indexed by:Journal paper

Correspondence Author:Mu Yang,Ge Wang

Volume:380,

Page Number:133224

Translation or Not:no

Date of Publication:2025-01-01

Included Journals:SCI