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Promotional role of MgO on sorption‐enhanced steam reforming of ethanol over Ni/CaO catalysts
Author(s) -
Sang Sier,
Zhao ZhiJian,
Tian Hao,
Sun Zhao,
Li Hongfang,
Assabumrungrat Suttichai,
Muhammad Tahir,
Zeng Liang,
Gong Jinlong
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16877
Subject(s) - catalysis , steam reforming , sintering , sorption , dispersion (optics) , chemical engineering , metal , chemistry , hydrogen production , inorganic chemistry , ethanol , hydrogen , materials science , organic chemistry , adsorption , engineering , physics , optics
This article describes the design and synthesis of MgO‐modified Ni/CaO catalysts for sorption‐enhanced steam reforming of ethanol. The results show that the introduction of MgO effectively increases the dispersion of CaO via forming MgCa(CO 3 ) 2 precursor. In the prepared MgO‐modified Ni/CaO catalysts, metallic Ni exists around MgO supported on CaO. Both 100% ethanol conversion and >96% hydrogen purity can be stabilized in 10 cycles over the catalyst containing 20 wt% MgO. The interaction between metallic Ni and MgO enhances the sintering resistance of the catalyst. More importantly, reaction pathway studies have confirmed that the formation of CaCO 3 hinders the activation of H 2 O on the Ni/CaO catalyst surface, and thus inhibits the conversion of the reaction intermediates including HCO* and CH x *. MgO can dissociate H 2 O to form hydroxyl groups which participate in the conversion of the reaction intermediates, thereby the MgO‐modified Ni/CaO catalysts have better catalytic performance and carbon deposition resistance.