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Physical mixtures as simple and efficient alternative to alloy carriers in chemical looping processes
Author(s) -
More Amey,
Veser Götz
Publication year - 2017
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.15380
Subject(s) - chemical looping combustion , alloy , methane , oxide , chemical engineering , combustion , chemistry , chemical reaction , carbon fibers , phase (matter) , materials science , metallurgy , organic chemistry , composite material , composite number , engineering
Chemical looping combustion is a clean combustion technology for fossil or renewable fuels. In a previous demonstration, chemical looping was applied to CO 2 activation via reduction to CO with concurrent production of synthesis gas (CO + H 2 ) from CH 4 via rationally designed Fe‐Ni alloys. Here, it is demonstrated that that a simple physical mixture can even outperform the equivalent alloy based on an intricate gas phase mediated coupling between the two metals: Ni cracks methane to carbon and H 2 . The latter then reduces iron oxide carrier, forming steam, which gasifies the carbon deposits on Ni to produce a mixture of CO + H 2 , thus regenerating the active Ni surface. It was suggested that the principle demonstrated here—the gas phase‐mediated coupling of two solid reactants with distinct functionalities—should be applicable broadly toward oxidation reactions and hence opens a new avenue for rational design of chemical looping processes. © 2016 American Institute of Chemical Engineers AIChE J , 63: 51–59, 2017