Faculty Profiles - NAGAOKA Katsutoshi

Papers - NAGAOKA Katsutoshi

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Co/TiO2 catalyst for high pressure dry reforming of methane and its modification by other metals Reviewed

Nagaoka K, Takanabe K, Aika KI

NATURAL GAS CONVERSION VII Vol. 147 page： 187 - 192 2004

Influence of the reduction temperature on catalytic activity of Co/TiO2 (anatase-type) for high pressure dry reforming of methane Reviewed

K Nagaoka, K Takanabe, K Aika

APPLIED CATALYSIS A-GENERAL Vol. 255 ( 1 ) page： 13 - 21 2003.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCIENCE BV

0.5 wt.% Co/TiO2 was prepared by incipient wetness impregnation with Co(NO3)(2)(.)6H(2)O and TiO2, which contains only anatase as crystal structure. The influence of reduction temperature (973-1223 K) on the catalytic activity of the 0.5 wt.% Co/TiO2 was investigated for the CH4/CO2 reaction under 2.0 MPa mainly at a space velocity (SV) of 6000 ml g(-1) h(-1). Co/TiO2 reduced below 1123 K lost its activity completely at the beginning of the reaction. The results of TPO revealed that large amounts of coke (greater than or equal to2.9 wt.% carbon for 24 h) were deposited on the catalysts during the CH4/CO2 reaction. On the other hand, Co/TiO2 reduced at and above 1123 K kept relatively stable activity for 24 h and did not show significant amounts of deposited coke (less than or equal to0.25 wt.% carbon). The natures causing different catalytic behavior among the catalysts were discussed with the results of TEM, XRD, and TPR. In addition, slow deactivation of the Co/TiO2 reduced at 1123 K, probably due to the oxidation of the metallic cobalt, was inhibited by the addition of small amount of ruthenium (Ru/Co = 0.05) and it was found that the strong resistance to the coking of the Co/TiO2 reduced at 1123 K was retained after the addition of ruthenium. (C) 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/S0926-860X(03)00631-8

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Other Link： http://orcid.org/0000-0003-1774-1537

Influence of the phase composition of titania on catalytic behavior of Co/TiO2 for the dry reforming of methane Reviewed

K Nagaoka, K Takanabe, K Aika

CHEMICAL COMMUNICATIONS ( 9 ) page： 1006 - 1007 2002

Language：English Publishing type：Research paper (scientific journal) Publisher：ROYAL SOC CHEMISTRY

The phase transfer of TiO2 from anatase to rutile for a 10wt% Co/TiO2 catalyst during the reduction causes serious disappearance of activity at 0.1 MPa during CH4/CO2 reforming, whereas the transfer for 0.5wt% Co/TiO2 brings about relatively stable activity at 2 MPa.

DOI： 10.1039/b201717m

Other Link： http://orcid.org/0000-0003-1774-1537

Effect of additives on the stability of Pd/Al2O3 for carbon dioxide reforming of methane Reviewed

Nagaoka K, Aika K

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN Vol. 74 ( 10 ) page： 1841 - 1846 2001.10

Mechanism of carbon deposit/removal in methane dry reforming on supported metal catalysts Reviewed

Nagaoka K, Seshan K, Lercher J.A, Aika K

Studies in Surface Science and Catalysis Vol. 136 page： 129 - 134 2001

Titania supported ruthenium as a coking-resistant catalyst for high pressure dry reforming of methane Reviewed

Katsutoshi Nagaoka, Masato Okamura, Ken-Ichi Aika

Catalysis Communications Vol. 2 ( 8 ) page： 255 - 260 2001

Language：English Publishing type：Research paper (scientific journal)

Support (SiO2, Al2O3, MgO, and TiO2) effects on catalytic behavior of Ru catalysts for the CH4/CO2 reforming were investigated under 2 (industrial condition) and 0.1 MPa at 1023 K. The order of the catalytic activity of the four catalysts investigated was dependent on the reaction pressure. High coking rate was observed at high pressure. 2 wt% Ru/TiO2, showing a low coking extent, is a promising candidate for industrial use. © 2001 Elsevier Science B.V. All rights reserved.

DOI： 10.1016/S1566-7367(01)00043-7

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Other Link： http://orcid.org/0000-0003-1774-1537

Activation mechanism of methane-derived coke (CHx) by CO2 during dry reforming of methane - comparison for Pt/Al2O3 and Pt/ZrO2 Reviewed

Nagaoka K, Seshan K, Lercher JA, Aika K

CATALYSIS LETTERS Vol. 70 ( 3-4 ) page： 109 - 116 2000

The effect of SnO2 addition to Li/MgO catalysts for the oxidative coupling of methane Reviewed

Nagaoka K, Karasuda T, Aika K

JOURNAL OF CATALYSIS Vol. 181 ( 1 ) page： 160 - 164 1999.1

The effect of SnO2 addition to Li/MgO catalysts for the oxidative coupling of methane Reviewed

K Nagaoka, T Karasuda, K Aika

JOURNAL OF CATALYSIS Vol. 181 ( 1 ) page： 160 - 164 1999.1

Active site generation by water for the activation of methane over non-reducible oxide catalysts: A study of MgO system Reviewed

Karasuda T, Nagaoka K, Aika K

NATURAL GAS CONVERSION V Vol. 119 page： 283-288 1998

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Papers - NAGAOKA Katsutoshi