Idemitsu Kosan Company, Limited

Hiroto Matsumoto

Hisashi Katsuno

Tadashi Kisen

Kazuhito Saito

Tomoki Yanagino

Hironobu Maeno

Souichi Uchiyama

The invention provides an optimum method for utilizing a desulfurizing agent for liquid hydrocarbons which can efficiently remove sulfur content from kerosene without performing addition of hydrogen to a low sulfur concentration and which has a prolonged lifetime. The invention provides a desulfurization method which includes removing sulfur content from kerosene by use of a metallic desulfurizing agent without performing addition of hydrogen, characterized in that the method employs desulfurization conditions satisfying the following formula (1):1.06&#xd7;&#x3c;1.78&#xd7;&#x2003;&#x2003;(1)(wherein Tis operation temperature (&#xb0; C.); Pis operation pressure (MPa); and Tis a temperature per 50 percent recovered as determined by 'test method for distillation at atmospheric pressure' stipulated in JIS K2254 'Petroleum products&#x2014;Determination of distillation characteristics as revised in 1998').

Method for desulfurization of liquid hydrocarbons and process for production of hydrogen for fuel cells

A ruthenium-on-alumina catalyst including at least a ruthenium component carried by a porous &agr;-alumina material. The catalyst has a specific surface area (S ) of 7-50 m /g, and a ratio S /S of the specific surface area of the ruthenium-on-alumina catalyst (S ) to the surface area of the porous &agr;-alumina material (S ) of 3-50. The catalyst has a micropore structure having a pore diameter distribution profile in which at least one peak falls within the range of 5-1,000 angstroms. The catalyst of the invention has excellent crushing strength, and high activity per unit ruthenium weight. Moreover, the catalyst has remarkable heat resistance, maintaining its high activity even at high temperatures of reaction and firing.

Alumina-supported ruthenium catalyst

A catalyst for reforming a hydrocarbon with steam has a platinum group metal deposited on a carrier having a volume of pores with pore sizes of 500 Angstroms or smaller being 0.15 ml per gram or greater, a volume of pores having pore sizes of more than 500 Angstroms being 0.14 ml per gram or smaller, and an average pore size being 90 Angstroms or greater. The platinum group metal specifically includes rhodium and ruthenium, and the carrier preferably includes zirconia and stabilized zirconia. As a promoter component, at least one metal of cobalt and manganese is used. The catalyst is high in catalytic activity and long in catalytic life.

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Chiba, Japan

Hiroto Matsumoto