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Catalytic Toluene Reforming with In Situ CO 2 Capture via an Iron–Calcium Hybrid Absorbent for Promoted Hydrogen Production
Author(s) -
Han Long,
Liu Qi,
Zhang Yuan,
Wang Qinhui,
Rong Nai,
Liang Xiaorui,
Feng Yi,
Ma Kaili,
Yan Mi,
Hu Yanjun
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.202000083
Subject(s) - toluene , catalysis , hydrogen production , carbonation , syngas , chemistry , reactivity (psychology) , chemical engineering , inorganic chemistry , hydrogen , calcium oxide , materials science , calcium looping , calcination , organic chemistry , medicine , alternative medicine , pathology , engineering
A two‐step sol–gel method is adopted to prepare an iron–calcium hybrid absorbent (Ca–Al–Fe) integrating iron catalysis component and inert support with CaO for calcium looping gasification. Effects of Ca–Al–Fe on cyclic CO 2 capture reactivity, mechanical strength, and enhanced reforming of biomass tar model component (toluene) are investigated by comparing with three reference absorbents. Results show that main components of Ca–Al–Fe are CaO, mayenite (Ca 12 Al 14 O 33 ), and brownmillerite (Ca 2 Fe 2 O 5 ). Ca 12 Al 14 O 33 plays key roles in keeping stable cyclic carbonation reactivity and significantly promotes mechanical strength of the novel absorbent. In comparison with other absorbents without coupling Ca 12 Al 14 O 33 or Ca 2 Fe 2 O 5 , Ca–Al–Fe approaches the highest toluene conversion (around 60%) and has the lowest coke deposition (12.2 mg g −1 ), due to the synergetic influences of Ca 2 Fe 2 O 5 and Ca 12 Al 14 O 33 , which significantly promotes hydrogen production while reducing CO 2 yield in reforming syngas. In addition, influences of reaction conditions such as iron loading, reaction temperature, molar ratio of H 2 O to carbon in toluene, and absorbent particle size on toluene reforming are examined in the presence of Ca–Al–Fe. Potential reaction routes of toluene reforming are also analyzed and discussed.