JP2003129073A - Fuel gas-treating agent and method for removing impurities in fuel gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fuel gas-treating agent which efficiently removes sulfur compounds in a fuel gas and also provide a method for treating the fuel gas with the treating agent concerned. SOLUTION: The fuel gas-treating agent is characterized in that it contains a composite compound consisting of metal components and an inorganic oxide and/or activated carbon. In this case, the metal components represent one or more metals selected from the group consisting of Ag, Cu, Zn, Sn, Pb, Cd, Bi, Hg, Pt, Pd, Ni, Fe, Co, Ru, Rh, Au and Mn, and the inorganic oxide represents one or more oxides of the element selected from the group consisting of Ti, Zr, Ce, Si, Al, Mg, Nb, Mo, W, Ca, Ba and P. Further, the composite compound is of one or more moldings selected from the group consisting of particles having average particle size of 3 nm to 3 mm, sphere, cube or rectangular parallelepiped, pellet, plate, needle and honeycomb.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for removing impurities in fuel gas and a fuel gas treating agent. In particular, the present invention relates to a method for removing impurities in a fuel gas and a fuel gas treating agent capable of treating a small-scale fuel gas to reduce the sulfur content in the fuel gas.

[0002]

BACKGROUND OF THE INVENTION In recent years, fuel cells have been attracting attention as a power generation system using clean hydrogen as an energy source, which is highly efficient, pollution-free, and does not generate greenhouse gases such as CO ₂ . Such fuel cells are under full-scale development research for the purpose of use in fixed facilities such as homes and businesses, and mobile facilities such as automobiles.

Examples of fuels used in this fuel cell include hydrocarbon fuels such as natural gas, LP gas, city gas, alcohol, gasoline, kerosene, light oil, and other biomass. Such a hydrocarbon fuel is first converted into hydrogen gas and CO gas by reactions such as steam reforming and partial oxidation, and CO gas that poisons the anode described later and deteriorates power generation performance is removed to remove hydrogen gas. To get This hydrogen is supplied to the anode, dissociated into hydrogen ions and electrons by the metal catalyst of the anode, the electrons flow to the cathode while working through the external circuit, and the hydrogen ions diffuse through the electrolyte membrane and move to the cathode, At, the free electrons react with the supplied oxygen to become water. That is, the fuel cell has a mechanism of extracting an electric current in the process of generating water by supplying oxygen and hydrogen derived from the fuel gas.

However, in the CO gas removing step, a noble metal such as Ru, Pt, Ni, Fe, or a metal catalyst is usually used. However, if sulfur components are present in the fuel even in the ppm order, the CO removing catalyst is poisoned. There has been a problem that the activity is reduced and CO gas remains, resulting in a reduction in the performance of the fuel cell. Therefore, when the fuel used in the fuel cell contains a sulfur component, it has been considered to remove the sulfur by a hydrodesulfurization method (usually under high temperature and hydrogen pressure) before use. However, this method requires a separate step to remove the hydrogen sulfide produced as a by-product, and when the sulfur content in the fuel oil is small, the hydrodesulfurization cost (equipment, running cost, etc.) relative to the amount of sulfur removed is high and economical. I had a problem with.

The applicant of the present application has proposed a removal method and an adsorbent by an efficient adsorption method when the sulfur component in a consumer fuel oil has a low concentration (Japanese Patent Application No. 2001-505).
No. 98). By the way, generally, for fuel such as LP gas and city gas, a predetermined amount (1 to 50 ppm) is added from the viewpoint of safety.
It is obligatory by law to add sulfur compounds such as benzothiophene and dibenzothiophene, and use them with odor.

Therefore, when using LP gas, city gas or the like as a fuel for a fuel cell, it is necessary to remove this sulfur compound before use. The present inventors have conducted intensive studies on a removal method capable of efficiently removing a sulfur compound in a gas, and as a result, have found that the use of a novel sulfur compound adsorbent enables extremely efficient removal to complete the present invention. Came to.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fuel gas treating agent capable of efficiently removing a sulfur compound in a fuel gas and a fuel gas oil treating method using the treating agent.

[0008]

SUMMARY OF THE INVENTION The fuel gas treating agent according to the present invention is characterized by containing a composite compound consisting of a metal component, an inorganic oxide and / or activated carbon. The metal component is
Ag, Cu, Zn, Sn, Pb, Cd, Bi, Hg, Pt, Pd,
One or more selected from the group consisting of Ni, Fe, Co, Ru, Rh, Au and Mn are preferable, and the inorganic oxides are Ti, Zr, Ce, Si, Al, Mg and N.
An oxide of one or more elements selected from the group consisting of b, Mo, W, Ca, Ba and P is preferable.

In the present invention, the composite compound is preferably in the form of particles having an average particle size of 3 nm to 3 mm, or spherical, cubic or rectangular parallelepiped, pellet, plate, needle, or honeycomb. It is used in the form of one or more moldings selected from the group. Further, in the present invention, the particulate composite compound may be contained or supported in one or more molded bodies selected from the group consisting of fibers, inorganic oxides, metals, resins and ceramics.

The method for removing impurities in fuel gas according to the present invention is characterized in that the fuel gas treating agent is brought into contact with the fuel gas. The temperature at which the fuel gas treating agent is brought into contact with the fuel gas is preferably in the range of -30 ° C to 50 ° C.

[0011]

DETAILED DESCRIPTION OF THE INVENTION First, a fuel gas treating agent according to the present invention will be described. [Fuel Gas Treatment Agent] The fuel gas treatment agent according to the present invention contains a composite compound including a metal component, an inorganic oxide, and / or activated carbon.

Metal Component As a metal component, Ag, Cu, Zn, Sn, Pb, Cd, B
i, Hg, Pt, Pd, Ni, Fe, Co, Ru, Rh, Au, M
It is preferably one or more selected from n. When the treating agent contains such a metal component, the sulfur compound (sulfur-containing hydrocarbon) contained as an impurity in the fuel gas can be adsorbed and removed.

In particular, the metal components are Ag, Cu, Zn, Sn and N.
When it is at least one selected from i and Pb, the adsorption amount of the sulfur compound is high, the concentration of the sulfur compound can be further reduced, and the fuel gas of 0.1 volppm or less can be obtained. The amount of the treating agent itself used can be reduced, and further, the treating agent can be repeatedly used.

The inorganic oxide and / or activated carbon inorganic oxide is not particularly limited as long as it does not react with the above-mentioned metal component or denatures the metal component to impair its function, and Ti, Zr, Ce, Si, Al, Mg, Nb,
It is preferably an oxide of one or more elements selected from the group consisting of Mo, W, Ca, Ba and P. It should be noted that the oxide of two or more elements is 2 even if it is a mixture of each oxide.
It may be a composite oxide of one or more elements.

Specifically, MgO, ZnO, Al ₂ O ₃ , B ₂
O ₃ , CeO ₂ , SiO ₂ , SnO ₂ , TiO ₂ , ZrO ₂ , P ₂ O
₅ , Sb ₂ O ₅ , Nb ₂ O ₅ , MoO ₃ , WO ₃ , MnO ₂ and other crystalline or amorphous oxides, SiO ₂ -Al ₂ O ₃ , Al ₂ O
_{3 -B 2 O 3, Al 2} O 3 -MgO, SiO 2 -TiO 2, SiO 2 -Zr
Examples thereof include crystalline or amorphous composite oxides such as O ₂ . Examples of crystalline complex oxides include porous crystalline aluminosilicate zeolite and clay minerals.

The inorganic oxide may contain the above-mentioned components as the main components, and may contain components other than the main components.
In the case of the above-mentioned complex oxide, if the alkali metal, the alkaline earth metal, etc. are contained, the metal component may be supported uniformly. Among the above, the inorganic oxide used in the present invention is preferably an oxide of one or more elements selected from Ti, Zr, Ce, Si and Al.

In the present invention, activated carbon, carbon nanotubes or the like can be preferably used together with the inorganic oxide or instead of the inorganic oxide. As the activated carbon, one having a high specific surface area such as coconut shell activated carbon is suitable because it can support a larger amount of metal components. The inorganic oxide and activated carbon used in the present invention may vary depending on the fuel gas treatment method, but may increase the amount of adsorption of sulfur, etc.,
A high specific surface area is preferred in order to accelerate the adsorption rate. Therefore, it is preferable that the particles are porous.

The specific surface area is 100 to 2000 m ² /
g, preferably in the range of 200 to 1500 m ² / g. Further, in this case, the average particle diameter of the particles is preferably in the range of 3 to 800 nm, and further preferably 3 to 500 nm. When the average particle size of the inorganic oxide and the activated carbon used is less than 3 nm, it is easy to sinter due to high-temperature heat treatment during preparation of the treating agent, and the specific surface area of the finally obtained treating agent decreases, resulting in sulfur content. When the average particle diameter exceeds 800 nm, the particles constituting the treating agent are too large and a treating agent having a high specific surface area may not be obtained.

When the average particle diameter of the inorganic oxide and / or the activated carbon is in the above range which is the colloidal particle region, it can be easily and uniformly loaded on the carrier described later,
Furthermore, molding can be easily performed, and a molded product having excellent strength can be obtained. Complex Compound The complex compound used in the present invention comprises the metal component and the inorganic oxide and / or activated carbon, and a predetermined amount of the metal component is supported on the inorganic oxide and / or activated carbon. The content of the metal component in the composite compound is 0.1 to 50.
It is preferably in the range of 1% to 30% by weight, more preferably 1 to 30% by weight. If the amount of the metal component in the composite compound is less than 0.1% by weight, the ability to adsorb sulfur is insufficient and
Even if it exceeds 0% by weight, the ability to adsorb sulfur content does not further improve, but tends to decrease.

The metal component preferably has an average particle size of 3n.
It is obtained as composite compound particles by being supported on the inorganic oxide particles and / or activated carbon particles in the range of m to 3 mm. Composite compound particles using an inorganic oxide can be prepared by producing inorganic oxide particles by a conventionally known method and then supporting a metal component.
Examples of the method for producing the inorganic oxide particles include silica-based composite oxide sols described in JP-A-5-132309 and JP-A-7-133105, and JP-A-63-45114. Silica sol,
The titania sol described in JP-A-63-229139,
For example, the method for producing titania / ceria sol described in JP-A-1-301517 and silica / alumina sol described in JP-A-5-132309 may be employed.

The inorganic oxide particles having an average particle size of about 1 μm or more can be obtained by the method described in Japanese Patent Publication No. 43201/1993 and Japanese Patent Publication No. 61406/1990 by the applicant of the present application. Specifically, the sol or gel obtained by the above method may be spray-dried or freeze-dried. Further, for the inorganic oxide particles having an average particle diameter of about 1 mm or more, for example, after drying the sol or gel obtained by any of the above methods, these dry powders are molded into a desired size by a known method. It is obtained by doing.

The inorganic oxide particles or activated carbon particles obtained by such a method are allowed to absorb an aqueous solution of the salt of the metal component, dried, and optionally calcined,
It is possible to obtain composite compound particles having a desired particle size. Further, according to the method disclosed in JP-A-5-132309, composite compound particles having an average particle diameter in the range of 3 to 500 nm can be produced. That is,
A silicate of an alkali metal, ammonium or an organic base, an alkali-soluble inorganic compound, and an aqueous solution of the salt of the metal component are added to an alkaline aqueous solution having a pH of 10 or more, and heated if necessary, so that the metal component It is possible to obtain composite compound particles carrying. Further, the composite compound particles having an average particle size in the range of 3 to 500 nm can be prepared according to the production method described in JP-A-63-270620. That is, by subjecting an aqueous solution of titanic acid obtained by adding hydrogen peroxide to a hydrous titanic acid gel or sol and an aqueous solution of a salt of the metal component to heat treatment, composite compound particles carrying a metal component can be obtained. .

Further, water is added to the composite compound particles having an average particle diameter in the range of 3 nm to 3 mm obtained as described above, and a molding aid or the like is added as necessary to suspend the composite compound particles. A liquid or paste is prepared, which is molded into a desired shape and size using an extruder or the like, dried, and fired if necessary, to obtain a spherical shape, a cubic shape or a rectangular parallelepiped shape, a pellet shape, a plate shape, It is possible to obtain a compound compound molded body having a needle shape, a honeycomb shape, or the like.

In addition to the activated carbon for supporting the metal component, activated carbon may be used as the carrier for supporting the composite compound. The particle size of the activated carbon used in this case is not particularly limited. Fuel gas treatment agent The fuel gas treatment agent according to the present invention is composed of only the above-described composite compound, or the composite compound is a fiber, or spherical, cubic or rectangular parallelepiped, pellet-shaped, plate-shaped, needle-shaped, honeycomb-shaped or the like as appropriate. Contained in and / or carried by the molded body.

The composite compound has an average particle size of 3 nm to 3 m.
It may be molded into an appropriate molded body such as m in the form of particles, spheres, cubes or cuboids, pellets, plates, needles, or honeycombs. In this case, the molded body preferably has a maximum diameter or maximum length of 0.5 mm to 10 cm. With such a specific shape, it is easy to fill or remove the treatment agent into the treatment container described later, or a certain amount can be filled with good reproducibility without irregularity in filling. In particular, the pressure difference between the inlet and outlet of the processing vessel can be kept small and constant when gas is passed through the processing vessel, and when used in mobile equipment, fluctuations in the filling state of the processing agent due to vibration are small. Therefore, the fuel gas with a reduced sulfur content can be stably obtained.

The shape of the treatment agent depends on the treatment amount used,
It can be appropriately selected in consideration of the processing conditions such as the processing speed and the shape of the processing container. Examples of the above-mentioned spherical and other shaped articles carrying the composite compound include molded articles made of ceramics, inorganic oxides, fibers, various resins, metals and the like. As various resins, polyethylene, polypropylene, polystyrene, polyacrylate, vinyl chloride, polyacrylonitrile, polyester, polyamide, silicone resin, natural rubber, cellulose and the like are used. Usually, a fuel gas treating agent is obtained by coating the surface of these molded bodies with a slurry of a composite compound by a method such as coating, drying and firing.

The fibers are not particularly limited, and examples thereof include natural or synthetic organic fibers and inorganic fibers. Examples of the organic fiber include cotton, flax, vegetable fiber such as pulp, wool, animal fiber such as silk, nylon, vinylon, vinylidene, polyester, acrylic, polyurethane, synthetic fiber such as acetate, and inorganic fiber such as alumina, Examples of the fibers include alumina / silica, zirconia, and asbestos. Further, the form of the fiber is not particularly limited, and examples thereof include a fibrous form of twisted yarn, a spun yarn form, a long fiber, a short fiber and a monofilament, and examples of the processed products thereof include a woven fabric and a non-woven fabric.

The method of supporting the composite compound particles on the fibers is not particularly limited as long as the composite compound particles can be supported so as not to fall off. For example, the method for producing an antibacterial fiber disclosed in JP-A-7-109674 by the applicant of the present application can be preferably applied. Specifically, the fibers are immersed in a water and / or organic solvent dispersion liquid of the composite compound particles, or the fibers are attached by a method such as spraying the dispersion liquid, then dried, and heated if necessary. It can be manufactured by fusing. The average particle size of the composite compound particles at this time is preferably in the range of 3 to 500 nm. If the average particle size exceeds 500 nm, the adhesiveness to the fiber may decrease and the desired amount of composite compound particles may not be able to adhere, although it depends on the material and thickness of the fiber. May fall off when contacted with gas for processing. The amount of the composite compound attached is preferably as large as possible without falling off, and is preferably 1 to 60% by weight, preferably 5 to 40% by weight.
Selected from the range. The fuel gas treating agent in which the composite compound particles having the average particle diameter in the above range are adhered in the above-described range of the adhering amount, the composite compound particles are fine particles and have a high specific surface area, so that the adsorption capacity of the sulfur compound etc. is high, Since it is supported in a highly dispersed state, it can exhibit a sufficient adsorption capacity and is excellent in processing capacity.

[Method for Removing Impurities] In the method for removing impurities in fuel gas according to the present invention, the above-mentioned fuel gas treating agent is brought into contact with fuel gas. The contact method is not particularly limited as long as the sulfur content in the fuel gas can be reduced to a predetermined concentration (0.1 volppm) or less. For example, it is mounted on a fixed storage / supply container containing fuel gas or a device using a mobile body. When the fuel gas is taken out from the treated container, there is a method of bringing the processing container filled with the fuel gas processing agent into contact with the fuel gas processing agent through the fuel gas.

Fuel Gas Examples of the fuel gas used in the present invention include natural gas, city gas, LNG and LPG. The untreated fuel gas treated in the present invention desirably has a sulfur compound concentration of less than 50 volppm, preferably less than 30 volppm. If the sulfur content in the fuel gas is higher than the upper limit of the above range, the sulfur compound concentration in the produced fuel gas may not be able to reach a desired low concentration (less than 0.1 volppm) because the sulfur content is too high. Even if it is possible, the amount of the treating agent of the present invention used increases, and the economical efficiency decreases.

The present invention is particularly preferably applied to a gas having a sulfur content of 4 volppm or less, which is stipulated in the city gas under the Gas Utility Act for general heating and the like. The fuel gas treating agent has an average particle size of 3 nm to 3 mm, particularly 500
In the case of the composite compound particles in the range of nm to 3 mm, they can be used as they are in contact with fuel oil as they are, but they can be filled in a pack (bag) such as a woven fabric or a non-woven fabric, or a metal or resin net or basket. The filled one may be filled in the above-mentioned processing container and brought into contact with the fuel gas.

The pressure at which the fuel gas treating agent and the fuel gas are brought into contact with each other is not particularly limited, but it does not have to be under increased pressure or reduced pressure, and normal pressure (atmospheric pressure) is sufficient. There is almost no difference in the ability to reduce impurities even if it is carried out under pressure or under reduced pressure. Further, the temperature at which the fuel gas treating agent and the fuel gas are brought into contact with each other is preferably in the range of -30 ° C to 50 ° C. Since this temperature range is a normal temperature range in cold regions and warm regions, it is not necessary to specially cool or heat. In addition, if the temperature is within the above range, there is almost no difference in the ability to remove the sulfur content even if it is cooled or heated. However, for safety, it is possible to adjust the temperature as needed.

The fuel gas treating agent after treating the above-mentioned amount of the fuel gas per unit treating agent is removed while desorbing, extracting, etc., the adsorbed sulfur content while being filled in the processing container or taken out. Can be used again.

[0034]

The fuel gas treating agent according to the present invention contains a composite oxide composed of a metal component and an inorganic oxide and / or activated carbon, and has an "average particle size of 3 to 800 nm".
Since it contains particles in the colloidal region, a large amount of sulfur content in the fuel gas can be adsorbed, so that the sulfur content is substantially removed, and a fuel gas suitable for use in fuel cells and the like is produced. can do.

According to the method for treating fuel gas of the present invention, the fuel gas treating agent contains a complex oxide composed of a metal component and an inorganic oxide and / or activated carbon, and has an appropriate shape and shape depending on the needs of the processing container and the like. The size can be selected, and the filling can be performed uniformly and with good reproducibility and easily. Therefore, the fuel in which the sulfur content is substantially removed is stable without causing a pressure difference or a large fluctuation. Gas can be produced.

[0036]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

[0037]

Example 1 Preparation of Fuel Gas Treatment Agent Colloidal particle dispersion of composite compound having a solid content concentration of 3.0% by weight (Catalyst Chemical Co., Ltd .: ATOMYBALL-S, inorganic oxide =
400 g of TiO ₂ .SiO ₂ and Ag content = 4.2% by weight, average particle size = 10 nm) were dried at 130 ° C. for 24 hours and then calcined at 350 ° C. for 2 hours. The powder obtained by firing was pressure-molded (molding pressure 50 Kg / cm ² ) and pulverized to prepare a fuel gas treating agent (A) having an average particle diameter of 2 mm.

Treatment of Fuel Gas (1) 2.5 g of the fuel gas treating agent (A) was charged in a reaction tube having an inner diameter of 0.8 mm, and at a temperature of 25 ° C., 1250 cc / hr of butane gas (containing 8 ppm of dimethyl sulfide). Was continuously fed at the rate of 1., and the time until the content of dimethyl sulfide at the outlet during the reaction exceeded 0.5 ppm (breakthrough time) was measured. The results are shown in Table 1.

At this time, the sulfur content in the fuel gas was measured by a gas chromatography (chemiluminescence detector) method. Treatment of fuel gas (2) 2.5 g of the fuel gas treating agent (A) was charged into a reaction tube having an inner diameter of 0.8 mm, and after vibrating with a vibrator to close the mixture, butane gas ( Dimethyl sulfide (8 ppm content) was continuously supplied at a rate of 1250 cc / hr, and the time (breakthrough time) until the content of dimethyl sulfide at the outlet of the reaction exceeded 0.5 ppm was measured. Shown in 1.

[0040]

[Example 2] Composite compound colloidal particle dispersion liquid having a solid content concentration of 3.0% by weight (Catalyst Kasei Co., Ltd .: ATOMYBALL-U)
A, inorganic oxide = SiO ₂ .Al ₂ O ₃ , Ag content = 4.2% by weight, average particle size = 20 nm) 400 g at 130 ° C.
It was dried for 4 hours and then calcined at 350 ° C. for 2 hours. Powder obtained by firing is pressure-molded (molding pressure 50 Kg / cm ² ).
Then, this was pulverized to prepare a fuel gas treating agent (B) having an average particle diameter of 2 mm.

Fuel Gas Treatment (1) and (2) Fuel oil was treated in the same manner as in Example 1. The results are shown in Table 1.

[0042]

[Example 3] Composite compound colloidal particle dispersion liquid having a solid content concentration of 3.0% by weight (manufactured by Catalysts & Chemicals Co., Ltd .: ATOMYBALL-UA
C, inorganic oxide = SiO ₂ .Al ₂ O ₃ , Cu content = 4.2% by weight, average particle diameter = 20 nm) 400 g at 130 ° C.
It was dried for 4 hours and then calcined at 350 ° C. for 2 hours. Powder obtained by firing is pressure-molded (molding pressure 50 Kg / cm ² ).
Then, this was pulverized to prepare a fuel gas treating agent (C) having an average particle diameter of 2 mm.

Fuel Gas Treatment (1) and (2) Fuel oil was treated in the same manner as in Example 1. The results are shown in Table 1.

[0044]

[Example 4] Composite compound colloidal particle dispersion having a solid content concentration of 3.0% by weight (manufactured by Catalysts & Chemicals Co., Ltd .: ATOMYBALL-U)
A, inorganic oxide = SiO ₂ .Al ₂ O ₃ , Ag content = 4.2% by weight, average particle diameter = 20 nm) 400 g was repeatedly absorbed by 10 g of pulp nonwoven fabric (Texel Oji Paper Co., Ltd.), and room temperature After being left at 30 ° C. for 30 minutes, it was dried at 130 ° C. for 24 hours to prepare a fuel gas treating agent (D).

Fuel gas treatment (1) and (2) Fuel oil was treated in the same manner as in Example 1 except that 4.7 g of the treating agent was charged. The results are shown in Table 1.

[0046]

Example 5 17.64 g of an aqueous silver nitrate solution having a concentration of 5% by weight
Was heated to a temperature of 80 ° C. to obtain a composite compound colloidal particle dispersion liquid having a solid content concentration of 3.0% by weight (manufactured by Catalysts & Chemicals Co., Ltd .: AT
OMYBALL-S, Inorganic oxide = TiO ₂ · SiO ₂ , Ag content =
4.2% by weight, average particle size = 10 nm) was added to 667 g with stirring. This solution was impregnated with 10 g of activated carbon (manufactured by Takeda Yakuhin Kogyo Co., Ltd .: Shirasagi, average particle size 4 μm) by repeatedly evaporating to dryness, followed by firing at 250 ° C. for 5 hours in nitrogen to prepare a fuel gas treatment agent. (E) was prepared.

Fuel gas treatment (1) and (2) Fuel oil was treated in the same manner as in Example 1 except that 3.9 g of the treating agent was charged. The results are shown in Table 1.

[0048]

Example 6 17.64 g of an aqueous silver nitrate solution having a concentration of 5% by weight
Was heated to a temperature of 80 ° C. to obtain a silica colloidal particle dispersion having a solid content concentration of 10.0% by weight (manufactured by Catalysts & Chemicals Co., Ltd.
(taloido, inorganic oxide = SiO ₂ , average particle size = 8 nm)
200 g was added with stirring. This solution was added with 10 g of activated carbon (manufactured by Takeda Pharmaceutical Co., Ltd .: Shirasagi, average particle size 4 μm).
m) was repeatedly impregnated by evaporation to dryness, and then 250
The fuel gas treating agent (F) was prepared by firing in nitrogen at 5 ° C. for 5 hours.

Fuel Gas Treatment (1) and (2) Fuel oil was treated in the same manner as in Example 1 except that 3.9 g of the treating agent was charged. The results are shown in Table 1.

[0050]

Comparative Example 1 68.2 g of an aqueous silver nitrate solution having a concentration of 4.7% by weight
Silica / alumina (manufactured by Catalysts & Chemicals Co., Ltd .: HA, A
l ₂ O ₃ 28% by weight, average diameter 65 μm) absorbed into 50 g,
Then, after drying at 130 ° C. for 24 hours, it was baked at 350 ° C. for 2 hours to prepare a fuel gas treating agent (G).

Fuel Gas Treatment (1) and (2) Fuel oil was treated in the same manner as in Example 1. The results are shown in Table 1.

[0052]

[Table 1]

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 4D012 BA01 BA03 CA07 CB02 CB09                       CE03 CF04 CG01 CG03 CG04                       CG05                 4G066 AA02B AA05B AA16B AA17B                       AA20B AA20C AA22B AA22C                       AA23B AA23C AA24B AA25B                       AA27B AA72B AC02C AC11B                       BA01 BA02 BA03 BA07 BA09                       BA10 BA16 BA20 CA25 DA04

Claims (8)

[Claims] 1. A fuel gas treating agent comprising a composite compound comprising a metal component and an inorganic oxide and / or activated carbon. 2. The metal component is Ag, Cu, Zn, Sn, P
b, Cd, Bi, Hg, Pt, Pd, Ni, Fe, Co, Ru, R
The fuel gas treating agent according to claim 1, which is one or more selected from the group consisting of h, Au, and Mn. 3. The inorganic oxide is Ti, Zr, Ce, Si, A
The fuel gas treating agent according to claim 1, which is an oxide of one or more elements selected from the group consisting of 1, Mg, Nb, Mo, W, Ca, Ba, and P. 4. The composite compound has an average particle diameter of 3 nm to
A particle having a particle size of 3 mm.
The fuel gas treating agent according to any one of 1 to 3. 5. The composite compound is one or more moldings selected from the group consisting of spherical, cubic or rectangular parallelepiped, pellet, plate, needle and honeycomb shapes. 4. The fuel gas treating agent according to any one of 3 above. 6. The particulate composite compound is contained or carried in one or more molded products selected from the group consisting of fibers, inorganic oxides, metals, resins and ceramics. The fuel gas treating agent described in. 7. A method for removing impurities from a fuel gas, which comprises bringing the fuel gas treating agent according to claim 1 into contact with the fuel gas. 8. The method for removing impurities in a fuel gas according to claim 7, wherein the temperature at which the fuel gas treating agent is brought into contact with the fuel gas is in the range of −30 ° C. to 50 ° C.