Effects of carbon deposition and de-coking treatments on the activation of CH4 and CO2 in CO2 reforming of CH4 over Ni/yttria-doped ceria catalysts

2004 ◽  
Vol 272 (1-2) ◽  
pp. 289-298 ◽  
Author(s):  
Jenshi B Wang ◽  
Yen-Shiun Wu ◽  
Ta-Jen Huang
Keyword(s):  
Carbon Deposition ◽  
Doped Ceria ◽  
Co2 Reforming ◽  
Co2 Reforming Of Ch4 ◽  
Ceria Catalysts ◽  
Yttria Doped Ceria

scholarly journals CO2 Reforming of CH4 Using Coke Oven Gas over Ni/MgO-Al2O3 Catalysts: Effect of the MgO:Al2O3 Ratio

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1468
Author(s):  
Ho-Ryong Park ◽  
Beom-Jun Kim ◽  
Yeol-Lim Lee ◽  
Seon-Yong Ahn ◽  
Kyoung-Jin Kim ◽  
...  
Keyword(s):  
Carbon Deposition ◽  
Active Material ◽  
Coke Oven ◽  
Catalytic Performance ◽  
Ni Catalyst ◽  
Coke Oven Gas ◽  
Co2 Reforming ◽  
Co2 Reforming Of Ch4 ◽  
Supported Ni Catalyst ◽  
Al2o3 Catalyst

Research is being actively conducted to improve the carbon deposition and sintering resistance of Ni-based catalysts. Among them, the Al2O3-supported Ni catalyst has been broadly studied for the dry reforming reaction due to its high CH4 activity at the beginning of the reaction. However, there is a problem of deactivation due to carbon deposition of Ni/Al2O3 catalyst and sintering of Ni, which is a catalytically active material. Supplementing MgO in Ni/Al2O3 catalyst can result in an improved MgAl2O4 spinel structure and basicity, which can be helpful for the activation of methane and carbon dioxide molecules. In order to confirm the optimal supports’ ratio in Ni/MgO-Al2O3 catalysts, the catalysts were prepared by supporting Ni after controlling the MgO:Al2O3 ratio stepwise, and the prepared catalysts were used for CO2 reforming of CH4 (CDR) using coke oven gas (COG). The catalytic reaction was conducted at 800 °C and at a high gas hourly space velocity (GHSV = 1,500,000 h−1) to screen the catalytic performance. The Ni/MgO-Al2O3 (MgO:Al2O3 = 3:7) catalyst showed the best catalytic performance between prepared catalysts. From this study, the ratio of MgO:Al2O3 was confirmed to affect not only the basicity of the catalyst but also the dispersion of the catalyst and the reducing property of the catalyst surface.

Suppression of carbon deposition in the CO2-reforming of CH4 by adding basic metal oxides to a Ni/Al2O3 catalyst

1996 ◽  
Vol 144 (1-2) ◽  
pp. 111-120 ◽  
Author(s):  
Tatsuro Horiuchi ◽  
Kaori Sakuma ◽  
Takehisa Fukui ◽  
Yukio Kubo ◽  
Toshihiko Osaki ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Carbon Deposition ◽  
Basic Metal ◽  
Co2 Reforming ◽  
Co2 Reforming Of Ch4 ◽  
Al2o3 Catalyst

Effect of Zr-Doped Ceria Catalyst on Carbon Deposition on Ni/YSZ Cermets

2007 ◽  
Vol 539-543 ◽  
pp. 2822-2827 ◽  
Author(s):  
Hong Peng He ◽  
Josephine M. Hill
Keyword(s):  
Carbon Deposition ◽  
Doped Ceria ◽  
Weakly Bound ◽  
Filamentous Carbon ◽  
Ceria Catalysts ◽  
Catalyst Pellets

Carbon deposition on Ni/YSZ cermets and the role of Zr-doped ceria catalysts on carbon deposition have been investigated in the present study. Upon exposure to methane, large amounts of filamentous carbon formed on the surface of the cermets. In addition, carbon dissolved into the Ni particles, significantly expanding the dimensions of the entire pellet. The addition of Zr-doped ceria catalyst pellets on each side of the Ni/YSZ cermet significantly reduced the amount of deposited carbon and affected the structure of the deposits. In particular, the carbon was more weakly bound to the surface and appeared only to be deposited on the Ni/YSZ surface and not dissolved into the structure.

Catalyst performance of MoS2 and WS2 for the CO2-reforming of CH4 Suppression of carbon deposition

1997 ◽  
Vol 155 (2) ◽  
pp. 229-238 ◽  
Author(s):  
Toshihiko Osaki ◽  
Tatsuro Horiuchi ◽  
Kenzi Suzuki ◽  
Toshiaki Mori
Keyword(s):  
Carbon Deposition ◽  
Co2 Reforming ◽  
Co2 Reforming Of Ch4
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