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Journal of the Japan Institute of Energy Vol. 83 (2004), No. 3

ISIJ International
belloff
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753
Publisher: The Japan Institute of Energy

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Journal of the Japan Institute of Energy Vol. 83 (2004), No. 3

Deactivation of a Presulfided Ni-W/Al2O3 Catalyst for Upgrading of Coal-derived Liquid

Yoshikazu SUGIMOTO, Hiroshi OZAWA

pp. 194-198

DOI:

10.3775/jie.83.194

Abstract

Coal-derived liquid contains a large amount of nitrogen compounds which should be removed for a clean motor fuel. In the coal liquefaction project in Japan, Ni-W/Al2O3 has been developped for the hydrodenitrogenation of coal liquid. The purpose of this paper is to show the high performance of the developped catalyst and to estimate the catalyst life.
A continuos trickeled-bed microreactor was used in this work. The preliminary experiments showed that 1) the catalyst shoud be presulfided at the high temperature such as 400°C under a H2S-H2 stream, 2) the raw coal liquid should be distilled before hydrotreating because of the existence of sludge material, 3) the higher puressure of H2 is preferable for deeper denitrogenation and longer catalyst life.
Based on the above information, the hydrotreatmnet of coal liquid (N; 5600wtppm) was carried out under 12MPa H2 and H2/oil ratio 1000 (L/L) for five months. It was supposed that the Ni-W/Al2O3 catalyst could reduce the nitrogen content from 5600ppm to 10ppm for about one year in the case of LHSV 1h-1.

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Ris

Disk-type Porous Carbon Prepared by Pressurized Carbonization and Methane Adsorption Ability

Akinori MUTO, Shin-ichiro TSUNEISHI, Satoru NISHIMA, Md. Azhar UDDIN, Hiroshi OGASA, Yusaku SAKATA

pp. 199-203

DOI:

10.3775/jie.83.199

Abstract

A natural gas car has been expected as an eco-friendly vehicle, as it is relatively clean burning fuel and economical. The adsorbed natural gas (ANG) is considered to be the most suitable option than the compressed gas (CNG) for vehicles because the ANG is available at the lower storage pressure. The preparative conditions including activation methods are crucial for the development of porous structure suitable for the high storage capacity. In this study, a disk type porous carbon adsorbent was developed by pressurized carbonization process using commercial phenol resin. The weight loss and volumetric reduce of the carbonaceous materials were remarkable at the beginning of the CO2 activation and increased the surface area, pore volume of adsorbent. The methane storage performance of the disk type porous carbon sorbent was evaluated by volumetric methane adsorption capacity of a storage vessel (V/Vs). The storage capacity (V/Vs) reached up to 128 (3.5MPa) when CO2 activation was performed at 600°C for 5h. In addition, the excessive activation deteriorated the development of pore structure and V/Vs. It was also found that not only specific surface area but also bulk density was important for improvement of V/Vs. The relationship between the storage capacity of methane and the preparation conditions of the disk type porous carbon adsorbent was discussed.

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Disk-type Porous Carbon Prepared by Pressurized Carbonization and Methane Adsorption Ability

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Hydrotreating of Three Kinds of Coal-derived Liquids and the Properties of Their Upgraded Oils

Yoshikazu SUGIMOTO, Hiroshi OZAWA

pp. 204-206

DOI:

10.3775/jie.83.204

Abstract

Coal-derived liquids obtained from three different coals were hydrotreated over a presulfided Ni-W/Al2O3 catalyst, and their HDN reactivities were compared with each other. The coal liquid with the lower boiling range and with the lower content of nitrogen has the higher HDN reaction rate because of the smaller retarding effect of polyaromatics and ammonia. The cetane index of the two-step hydrotreated oils were around 36, which indicates that the cetane number would be below 45. Then the coal-derived oils should be mixed with conventional petroleum gas oil fractions for the economical uasage as a diesel fuel.

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Hydrotreating of Three Kinds of Coal-derived Liquids and the Properties of Their Upgraded Oils

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The Developing Strategy and Research for Chinese Energy Resources

Yusheng XIE, Shufeng YE, Kuniyuki KITAGAWA, Kali WANG

pp. 207-211

DOI:

10.3775/jie.83.207

Abstract

The current world energy resource system is changing from the petroleum age to the petroleum natural gas age. The general trend of the energy development in the world is to develop clean, high quality and efficient energy, to pay more attention to the environment issues such as ozone layer depletion, CO2 discharge and acid rain, to devote all efforts to raise the utilization efficiency, and to save energy, i.e. to reduce energy consumption. They have become important basis to formulate the policy and strategy for energy development over the world.
To well coordinate the relationship among sustained development of economy and science, energy supply and environment protection in China, it has been followed with interest by all of the colleagues in the world. Based on that issue and the theory of existence, in this paper we introduce and analyse the status, progress, scientific research and developing strategy for the development and utilization of energy in China. Finally, we have discussed the prospects for the cooperation in science and technology between China and Japan.

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The Developing Strategy and Research for Chinese Energy Resources

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