摘要:
Crystalline silicates and processes for the production thereof are described. These crystalline silicates are of new crystalline structure, which, as determined after calcination in the air at 550.degree. C., have a composition represented by the general formula (I): pM.sub.2/n O.Al.sub.2 O.sub.3.qSiO.sub.2 (the symbols are as defined in the appended claims) and give a X-ray diffraction pattern as shown in Table 2. They are superior in heat resistance and acid resistance, and can be used as catalysts for the conversion of various organic compounds, absorbents, or as catalysts for various reactions. They are produced by reacting an aqueous mixture comprising (a) a silica source, (b) an alumina source, (c) an alkali metal and/or alkaline earth metal source, and monoethanolamine at a temperature of 100.degree. to 300.degree. C. until the desired crystalline silicates are formed. Although monoethanolamine does not remain in the crystalline silicates, it plays an important role in the formation of the desired crystalline structure in the course of the production thereof.
摘要:
Crystalline silicates and processes for the production thereof are described. These crystalline silicates are of new crystalline structure, which, as determined after calcination in the air at 550.degree. C., have a composition represented by the general formula (I): pM.sub.2/n O.Al.sub.2 O.sub.3.qSiO.sub.2 (the symbols are as defined in the appended claims) and give a X-ray diffraction pattern as shown in Table 2. They are superior in heat resistance and acid resistance, and can be used as catalysts for the conversion of various organic compounds, absorbents, or as catalysts for various reactions. They are produced by reacting an aqueous mixture comprising (a) a silica source, (b) an alumina source, (c) an alkali metal and/or alkaline earth metal source, and (d) ethylene glycol or (e) monoethanolamine at a temperature of 100.degree. to 300.degree. C. till the desired crystalline silicates are formed. Although ethylene glycol and monoethanolamine do not remain in the crystalline silicates, they play important roles in the formation of the desired crystalline structure in the course of the production thereof.
摘要:
A method for removing sulfur compounds from a hydrocarbon-containing gas wherein the gas is fed to a desulfurizing bed comprising a desulfurizing agent A comprising zeolite and a desulfurizing agent B comprising at least one selected from the group consisting of a metal element, a metal oxide and a metal component-carried oxide, is provided. Hydrogen for a fuel cell is produced by a method, wherein the gas obtained by the described desulfurization method is contacted with a partial oxidation reforming catalyst, an autothermal reforming catalyst or a steam reforming catalyst.
摘要:
The present invention provides a catalyst precursor substance containing copper, zinc, and aluminum and exhibiting an X-ray diffraction pattern having a broad peak at a specific interplanar spacing d (Å). The present invention also provides a method for producing the catalyst precursor substance by mixing a solution containing a copper salt, a zinc salt, and an aluminum salt with a solution containing an alkali metal hydroxide or an alkaline earth metal hydroxide, thereby forming a precipitate. In the present invention, a catalyst is prepared through calcining of the catalyst precursor; the catalyst is employed for water gas shift reaction; and carbon monoxide conversion is carried out by use of the catalyst. Thus, the present invention also provides a catalyst useful for water gas shift reaction, which exhibits high activity and durability and which, even when applied to a fuel cell, can be used for a long period of time with reduction in activity being suppressed; a carbon monoxide conversion method employing the catalyst; and a fuel cell system employing hydrogen produced through the carbon monoxide conversion method.
摘要:
The invention provides a catalyst for carbon monoxide conversion, comprising from 10 to 90% by mass of a copper oxide ingredient, from 5 to 50% by mass of a zinc oxide ingredient and from 10 to 50% by mass of an aluminum oxide ingredient, and having a specific surface area of from 100 to 300 m2/g, a carbon monoxide adsorption of from 20 to 80 μmol/g, and a copper oxide crystallite diameter of at most 200 angstroms, as a catalyst suitable for carbon monoxide conversion for fully reducing carbon monoxide in the hydrogen gas obtained through reforming of a starting hydrocarbon material, for the purpose of enabling stable long-term operation of a fuel cell which uses hydrogen gas as a fuel and which is frequently and repeatedly started and stopped.
摘要:
The present invention provides a catalyst precursor substance containing copper, zinc, and aluminum and exhibiting an X-ray diffraction pattern having a broad peak at a specific interplanar spacing d (Å). The present invention also provides a method for producing the catalyst precursor substance by mixing a solution containing a copper salt, a zinc salt, and an aluminum salt with a solution containing an alkali metal hydroxide or an alkaline earth metal hydroxide, thereby forming a precipitate. In the present invention, a catalyst is prepared through calcining of the catalyst precursor; the catalyst is employed for water gas shift reaction; and carbon monoxide conversion is carried out by use of the catalyst. Thus, the present invention also provides a catalyst useful for water gas shift reaction, which exhibits high activity and durability and which, even when applied to a fuel cell, can be used for a long period of time with reduction in activity being suppressed; a carbon monoxide conversion method employing the catalyst; and a fuel cell system employing hydrogen produced through the carbon monoxide conversion method.
摘要:
Provided are a coloration agent for carbonyl sulfide which contains a metal oxide, and at least one metal component selected from among a cerium component, a silver component, a copper component, a nickel component, and an iron component, the metal component being supported on the metal oxide, or which contains at least one metal oxide selected from among a cerium oxide, a silver oxide, a copper oxide, a nickel oxide, and an iron oxide; carbonyl sulfide detection means including the coloration agent for carbonyl sulfide; and a fuel cell system including the detection means. The coloration agent for carbonyl sulfide has the ability to develop a color in the presence of carbonyl sulfide even at ambient temperature, exhibits excellent performance in detecting carbonyl sulfide contained in a hydrocarbon fuel, and enables the service life of a desulfurizing agent to be determined through visual observation.
摘要:
The present invention relates to a catalyst for reforming a hydrocarbon comprising a carrier containing manganese oxide and carried thereon (a) at least one component selected from a ruthenium component, a platinum component, a rhodium component, a palladium component, an iridium component and a nickel component and a process for producing the same and to a process for reforming a hydrocarbon (steam reforming, self thermal reforming, partial oxidation reforming and carbon dioxide reforming) using the above catalyst. Provided are a catalyst for reforming a hydrocarbon which comprises ruthenium, platinum, rhodium, palladium, iridium or nickel as an active component and in which a reforming activity is elevated, a process for producing the same, and a steam reforming process, a self thermal reforming process, a partial oxidation reforming process and a carbon dioxide reforming process for a hydrocarbon using the above catalyst.
摘要:
The invention provides a catalyst for carbon monoxide conversion, comprising from 10 to 90% by mass of a copper oxide ingredient, from 5 to 50% by mass of a zinc oxide ingredient and from 10 to 50% by mass of an aluminum oxide ingredient, and having a specific surface area of from 100 to 300 m2/g, a carbon monoxide adsorption of from 20 to 80 μmol/g, and a copper oxide crystallite diameter of at most 200 angstroms, as a catalyst suitable for carbon monoxide conversion for fully reducing carbon monoxide in the hydrogen gas obtained through reforming of a starting hydrocarbon material, for the purpose of enabling stable long-term operation of a fuel cell which uses hydrogen gas as a fuel and which is frequently and repeatedly started and stopped.
摘要:
The present invention provides an adsorbent for removing sulfur compounds, which adsorbent can effectively remove a variety of sulfur compounds contained in a hydrocarbon fuel to a low concentration even at room temperature; a process for effectively producing hydrogen that can be used in a fuel cell; and a fuel cell system employing hydrogen produced through the process.The adsorbent for removing a sulfur compound contained in a hydrocarbon fuel contains cerium oxide. The process for producing hydrogen that can be used in a fuel cell includes desulfurizing a hydrocarbon fuel through removal of a sulfur compound contained in the a hydrocarbon fuel by use of the aforementioned adsorbent and, subsequently, bringing the thus-desulfurized fuel into contact with a partial-oxidation reforming catalyst, an authothermal reforming catalyst, or a steam reforming catalyst. The fuel cell system employs hydrogen produced through the process.