CN104667952A

CN104667952A - Pt/SiC catalyst and preparation method thereof

Info

Publication number: CN104667952A
Application number: CN201310672256.2A
Authority: CN
Inventors: 林南
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-02
Filing date: 2013-12-02
Publication date: 2015-06-03

Abstract

The invention discloses a Pt/SiC catalyst and a preparation method thereof, belonging to the field of chemical catalysts. The catalyst is that SiC is used as a carrier and metal Pt is used as an active ingredient, wherein the catalyst contains 5 to 10% by mass of Pt. According to the catalyst, SiC has outstanding characteristics of being high in heat conductivity, high in heat stability, high in mechanical strength and resistant to chemical corrosion, so that the catalyst is particularly suitable for a reaction system under the conditions of high temperature, high radiating/ heat absorbing and corrosive medium. The catalyst prepared by the method is high in heat conductivity and mechanical performance; a hot point can be avoided during methanation reaction; meanwhile, the catalyst is high in wear resistance, so that the service life is greatly prolonged; the catalyst is relatively high in stability; in addition, the process is simple, consumed time is short, and the energy consumption is small.

Description

Pt/SiC Catalysts and its preparation method

Technical field

The invention belongs to catalytic field, be specifically related to a kind of preparation method of catalyst.

Background technology

In recent years, in order to meet the Natural Gas Demand day by day increased, ensure domestic energy security, alleviate the capacity usage ratio of environmental pollution and raising coal, coal synthetic natural gas technology has been a great concern. and coal preparing natural gas mainly comprises the steps such as coal gasification, raw gas conversion, purified synthesis gas and methanation, and wherein the research and development of high-performance methanation catalyst are the most key.Synthesis gas methanation is strong exothermic process, and technique adds steam usually to reduce temperature rise and to suppress carbon distribution, this requires that catalyst has high activity and stability.Nickel-base catalyst activity is higher, advantage of lower cost, and having better methane selectively with other Metal Phase ratio, is investigation and application methanation catalyst the most widely.But, the methanation catalyst of current report is mostly carrier with oxide, its thermal conductivity is poor, a large amount of reaction heat is easily accumulated in bed regional area thus forms focus, very easily cause sintering of catalyst, under serious conditions, even can impel methane cracking carbon distribution. adopt the good high-temperature resistant carrier material of thermal conductivity to carry out Kaolinite Preparation of Catalyst, the localized heat buildup of bed can be reduced, reducing local temperature rise, is one of effective ways solved the problem.

Summary of the invention

The present invention is directed to the problems referred to above, providing a kind of take carborundum as the Pt metallic catalyst of carrier.

In order to solve above technical problem, the present invention is achieved by the following technical programs:

Pt/SiC catalyst S iC is carrier, Pt metal is active component, and wherein Pt mass percentage is in the catalyst 5%-10%.Its preparation method mainly comprises the steps:

1) SiC carrier is prepared;

2) Pt metallic solution is configured;

3) be impregnated on SiC carrier by the Pt metallic solution of equivalent, dry 6-10h under the condition of 100-200 DEG C, then reduction treatment 3-6h in 500-800 DEG C of H2, obtain the Pt catalyst be carried on carborundum.

In the present invention, preferably, described Carboround is Powdered, order number is 30-80 order, add the direct combination reaction synthesis of deionized water by the silica flour of equivalent and activated carbon powder, then dry 24h under the condition of 100-150 DEG C, and under the condition of 1200-1500 DEG C, calcine 2-4h obtain.

In the present invention, preferably, described Pt metallic solution is platinum nitrate or platinum chloride solution, and concentration is 0.5-2mol/L.

Because SiC has, thermal conductivity is high, Heat stability is good, mechanical strength are high and the good characteristic such as resistance to chemical attack, be specially adapted to the reaction system that high temperature, strong exothermic/endothermic and the medium that is corrosive exist, so the catalyst prepared by method of the present invention, there is following beneficial effect:

1) catalyst has good heat conductivility and mechanical performance, can avoid the appearance of focus in methanation reaction process, has good antiwear property simultaneously, greatly extends the life-span of catalyst.

2) this catalyst has good stability;

3) technical process of this catalyst is simple, and takes short, and energy consumption is low.

Detailed description of the invention

Embodiment 1

1) silica flour of 20 grams mixed with 20 grams of activated carbon powders add deionized water and stirring, dry 24h at 100 DEG C, at 1200 DEG C, then calcine 4h obtain SiC carrier, grind screening, get order number be 40 SiC powder 20g for subsequent use;

2) platinum nitrate being dissolved in obtained concentration in deionized water is the platinum nitrate solution 20ml of 1.5mol/L;

3) by step 1) SiC powder add step 2) in solution in, then dry 6h at 100 DEG C, and in H2 environment, temperature is reduce 4h under the condition of 500 DEG C, obtain Pt/SiC catalyst, wherein Pt accounts for the mass percent of catalyst is 8%.

Embodiment 2

1) silica flour of 50 grams mixed with 50 grams of activated carbon powders add deionized water and stirring, dry 24h at 120 DEG C, at 1400 DEG C, then calcine 3h obtain SiC carrier, grind screening, get order number be 80 SiC powder 40g for subsequent use;

2) platinum nitrate being dissolved in obtained concentration in deionized water is the platinum nitrate solution 40ml of 0.5mol/L;

3) by step 1) SiC powder add step 2) in solution in, then dry 6h at 100 DEG C, and in H2 environment, temperature is reduce 3h under the condition of 800 DEG C, obtain Pt/SiC catalyst, wherein Pt accounts for the mass percent of catalyst is 9%.

Embodiment 3

1) silica flour of 40 grams mixed with 40 grams of activated carbon powders add deionized water and stirring, dry 24h at 110 DEG C, at 1500 DEG C, then calcine 2h obtain SiC carrier, grind screening, get order number be 60 SiC powder 30g for subsequent use;

2) platinum nitrate being dissolved in obtained concentration in deionized water is the platinum nitrate solution 30ml of 1.0mol/L;

3) by step 1) SiC powder add step 2) in solution in, then dry 6h at 120 DEG C, and in H2 environment, temperature is reduce 6h under the condition of 600 DEG C, obtain Pt/SiC catalyst, wherein Pt accounts for the mass percent of catalyst is 7.5%.

The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.

Claims

1.Pt/SiC catalyst, is characterized in that, described catalyst take SiC as carrier, Pt metal is active component, and wherein Pt mass percentage is in the catalyst 5%-10%.

2. the preparation method of Pt/SiC catalyst according to claim 1, is characterized in that, comprise the steps:

1) SiC carrier is prepared;

2) Pt metallic solution is configured;

3. the preparation method of a kind of Pt/SiC catalyst according to claim 2, it is characterized in that, described Carboround is Powdered, order number is 30-80 order, the direct combination reaction synthesis of deionized water is added by the silica flour of equivalent and activated carbon powder, then dry 24h under the condition of 100-150 DEG C, and under the condition of 1200-1500 DEG C, calcine 2-4h obtain.

4. the preparation method of a kind of Pt/SiC catalyst according to claim 2, is characterized in that, described Pt metallic solution is platinum nitrate or platinum chloride solution, and concentration is 0.5-2mol/L.