Enhancement of perovskites performance for coal tar decomposition by pore structure and acid-base modification. (1st January 2023)

• Record Type: Journal Article
• Authors: Cui, Xin; Wu, Tong; Gai, Didi; Yang, Chuanjiang; Ding, Yan; Zhao, Peitao
• Is Part Of: Fuel. Volume 331:Part 2(2023)
• Publication Date: 2023-01-01
• Subjects: Coal tar cracking -- Pore structure modification -- Acidity and basicity -- Reactant diffusion; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.125654
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Pore structure modification of LaNi0.8 Fe0.2 O3 perovskites for coal tar removal. LaNi0.8 Fe0.2 O3 prepared by MCM-48 hard template showed the highest activity. Mesoporous perovskites acted as the acid-base bifunctional catalysts. Synergy of acidity and reactant diffusion affected the tarry products selectivity. Abstract: Catalytic cracking is an efficient way to replace conventional combustion to remove coal tar deposited at the gas outlet of COREX melter gasifier. This work prepared a series of LaNi0.8 Fe0.2 O3 perovskites (Ni 0.8) with different pore structures via the hard-template method and applied in the catalytic cracking of coal tar was operated at 700 °C to evaluate the performance of perovskites. Ni 0.8 prepared via MCM-48 template (MCM-0.8) exhibited the high specific surface area (SSA) of 90.2 m 2 /g and pore volume of 0.3 cm 3 /g, accounting for its highest gas yield (51.8 mmol/gcoal ) and complete tar removal. The remarkable oxidation capacity of MCM-0.8 resulted in its highest CO2 yield (11.2 mmol/gcoal ) and selectivity for oxygenated compounds in tar (71.1 %). Three mesoporous Ni 0.8 participated in the catalytic reactions as the acid-base bifunctional catalysts. Ni 0.8 prepared via SBA-15 template (SBA-0.8) showed a great hydrocracking activity due to its strongest acidity of 1.87 mmol/g. All the synthesized perovskites possessed a good reactant selectivity, and the tarry product selectivity over different perovskites was influenced by the synergistic effect of acidity and the reactant diffusion inside the catalyst channels.