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Promoted calcium looping H 2 production via catalytic reforming of polycyclic aromatic hydrocarbon using a synthesized CO 2 absorbent prepared by impregnation
Author(s) -
Han Long,
Ma Kaili,
Wu Yuelun,
Jing Nijie,
Jin Liang,
Wu Pingjiang,
Xu Guoqiang,
Xia Jia,
Zhang Chengkun
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.6528
Subject(s) - carbonation , calcium oxide , chemistry , chemical engineering , catalysis , tar (computing) , calcination , reactivity (psychology) , hydrocarbon , nuclear chemistry , organic chemistry , medicine , alternative medicine , pathology , computer science , engineering , programming language
Summary Promoting multicycle CO 2 absorption ability and mechanical strength while enhancing heavy tar elimination performance of calcium‐based absorbents is a significant challenge for calcium looping gasification (CLG). A synthesized absorbent Fe/Ca‐Al was developed by an impregnation method consisting of two steps, during which an inert support and an iron catalytic component were integrated with calcium oxide (CaO). Fe/Ca‐Al was compared with three other candidate absorbents in terms of their basic properties and performances. Results indicated that the major components of the synthesized Fe/Ca‐Al were CaO, mayenite (Ca 12 Al 14 O 33 ), and Ca 2 Fe 2 O 5 . The CO 2 absorption ability of Fe/Ca‐Al gradually increased within 10 carbonation–calcination cycles and the mechanical strength was apparently promoted by the component Ca 12 Al 14 O 33 . Fe/Ca‐Al approached the largest conversion for the heavy tar model component 1‐methylnaphthalene (70.6%), the highest H 2 yield (0.18 mol/[hr·g]), and the least coke deposition (8.18 mg/g) during reforming. The synergistic effects of Ca 12 Al 14 O 33 and Ca 2 Fe 2 O 5 on the performance of Fe/Ca‐Al were analyzed. The effects of the mass ratio Fe/CaO, temperature of reforming reaction, molar ratio of S/C in tar, and the absorbent particle size on the reforming performance of heavy tar were also explored. The results of this study should provide useful information and possible solutions for CLG to overcome development obstacles. Novelty Statement The present work simultaneously addresses the key challenges of CaO‐based absorbents, including not only cyclic carbonation reactivity and mechanical strength of the absorbents but also heavy tar reduction performance and the influence of different reaction conditions, which are rarely reported in the literature. A synthesized iron‐calcium absorbent is developed by a two‐step impregnation method, which is beneficial to enhance biomass heavy tar (such as PAH) reduction, cyclic CO 2 capture, and mechanical strength of the absorbent for hydrogen production in calcium looping gasification.