TY - JOUR
T1 - Combination of hydrotalcite-like-compound-derived Ni-Fe/Mg/Al and ceria-supported Rh catalysts for fuel reforming in exhaust gas recirculation system of gasoline engine
AU - Betchaku, Mii
AU - Nakagawa, Yoshinao
AU - Tamura, Masazumi
AU - Yabushita, Mizuho
AU - Miura, Yasutomo
AU - Iida, Shinya
AU - Tomishige, Keiichi
N1 - Funding Information:
This work was supported by JSPS KAKENHI 18H05247 and JST.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/1
Y1 - 2022/1
N2 - Hydrotalcite-like-compound-derived Ni-Fe/Mg/Al catalyst, which is known to have high catalytic performance on reforming when activated by pre-reduction with H2, was combined with small amount of noble metal to obtain self-activation ability (startability) in toluene reforming with model exhaust gas of gasoline engine of automobiles. Rh is found to be the most effective noble metal from the viewpoints of the inherent reforming activity, good promotion of reduction of Ni[sbnd]Fe, and stability. Physical mixing of Rh/CeO2 and Ni-Fe/Mg/Al powders before shaping to granules gave higher activity in the startability test (reaction without pre-reduction) than other combination methods of Rh/CeO2 + Ni-Fe/Mg/Al, although the activity increase from Rh/CeO2 was much smaller than the potential activity of Ni-Fe/Mg/Al catalyst induced by pre-reduction with H2. Direct addition of Rh to Ni-Fe/Mg/Al by impregnation gave inferior performance to the mixture catalyst, because of the lower activity of Rh on hydrotalcite-derived oxide support than that of Rh on CeO2 support. The characterization with XRD, TEM-EDX and XAS showed that the reduction degrees of Ni, Fe and even Rh were small during the startability test. The Ni and Fe species only located near Rh species were probably reduced by reforming products from toluene formed over Rh.
AB - Hydrotalcite-like-compound-derived Ni-Fe/Mg/Al catalyst, which is known to have high catalytic performance on reforming when activated by pre-reduction with H2, was combined with small amount of noble metal to obtain self-activation ability (startability) in toluene reforming with model exhaust gas of gasoline engine of automobiles. Rh is found to be the most effective noble metal from the viewpoints of the inherent reforming activity, good promotion of reduction of Ni[sbnd]Fe, and stability. Physical mixing of Rh/CeO2 and Ni-Fe/Mg/Al powders before shaping to granules gave higher activity in the startability test (reaction without pre-reduction) than other combination methods of Rh/CeO2 + Ni-Fe/Mg/Al, although the activity increase from Rh/CeO2 was much smaller than the potential activity of Ni-Fe/Mg/Al catalyst induced by pre-reduction with H2. Direct addition of Rh to Ni-Fe/Mg/Al by impregnation gave inferior performance to the mixture catalyst, because of the lower activity of Rh on hydrotalcite-derived oxide support than that of Rh on CeO2 support. The characterization with XRD, TEM-EDX and XAS showed that the reduction degrees of Ni, Fe and even Rh were small during the startability test. The Ni and Fe species only located near Rh species were probably reduced by reforming products from toluene formed over Rh.
KW - Exhaust gas recirculation
KW - Nickel
KW - Self-activation
KW - Steam reforming
KW - Toluene
UR - http://www.scopus.com/inward/record.url?scp=85117401524&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85117401524&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2021.107061
DO - 10.1016/j.fuproc.2021.107061
M3 - Article
AN - SCOPUS:85117401524
SN - 0378-3820
VL - 225
JO - Fuel Processing Technology
JF - Fuel Processing Technology
M1 - 107061
ER -