TY - JOUR
T1 - In situ generation of COx-free H2 by catalytic ammonia decomposition over Ru-Al-monoliths
AU - Armenise, Sabino
AU - Cazaña, Fernando
AU - Monzón, Antonio
AU - García-Bordejé, Enrique
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Ru catalysts supported on alumina coated monoliths has been prepared employing three different precursor, which are ruthenium chloride, ruthenium nitrosyl nitrate and ruthenium acetyl acetonate, by an equilibrium adsorption method. The Ru particle sizes could be controlled varying the metal precursor salt. Among the prepared catalysts, Ru catalyst prepared from nytrosyl nitrate exhibited the highest activity which is concomitant to the largest mean Ru particle size of 3.5 nm. The values of the apparent activation energy calculated from the Arrhenius equation are according to the Temkin-Phyzev model, indicating that the recombinative desorption of N ad-atoms is the rate-determining step of the reaction. However, the ratio between the kinetic orders with respect to ammonia and hydrogen (−α/β), is not in agreement to the valued predict by Temkin formalism. This fact could be related to the different operational conditions used during the reaction, and/or catalyst nature, but not to any change on the controlling step of the reaction.
AB - Ru catalysts supported on alumina coated monoliths has been prepared employing three different precursor, which are ruthenium chloride, ruthenium nitrosyl nitrate and ruthenium acetyl acetonate, by an equilibrium adsorption method. The Ru particle sizes could be controlled varying the metal precursor salt. Among the prepared catalysts, Ru catalyst prepared from nytrosyl nitrate exhibited the highest activity which is concomitant to the largest mean Ru particle size of 3.5 nm. The values of the apparent activation energy calculated from the Arrhenius equation are according to the Temkin-Phyzev model, indicating that the recombinative desorption of N ad-atoms is the rate-determining step of the reaction. However, the ratio between the kinetic orders with respect to ammonia and hydrogen (−α/β), is not in agreement to the valued predict by Temkin formalism. This fact could be related to the different operational conditions used during the reaction, and/or catalyst nature, but not to any change on the controlling step of the reaction.
KW - Ammonia decomposition
KW - CO-free
KW - Kinetics
KW - Nanoparticle
KW - Ru-catalyst
KW - Structured reactors
UR - http://www.scopus.com/inward/record.url?scp=85049459454&partnerID=8YFLogxK
U2 - 10.1016/j.fuel.2018.06.129
DO - 10.1016/j.fuel.2018.06.129
M3 - Article
AN - SCOPUS:85049459454
SN - 0016-2361
VL - 233
SP - 851
EP - 859
JO - Fuel
JF - Fuel
ER -