CN108452798B - High-temperature-resistant sintering supported noble metal catalyst for catalytic oxidation of carbon monoxide and preparation method thereof - Google Patents
High-temperature-resistant sintering supported noble metal catalyst for catalytic oxidation of carbon monoxide and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high-temperature-resistant sintering load type noble metal catalyst for catalytic oxidation of carbon monoxide and a preparation method thereof2Or CeO2A nanoparticle; the active component is a noble metal Au, Pt or Pd nano-particle; the active component is loaded on the surface of the carrier; the surface of the carrier nano-particles and the periphery of the active component noble metal nano-particles are coated with a coating shell layer which is SiO2And (4) shell layer. The method is simple, mild in condition, short in period, suitable for large-scale synthesis and small in influence on environment.
Description
Technical Field
The invention relates to a high-temperature-resistant sintering supported noble metal catalyst for catalytic oxidation of carbon monoxide and a preparation method thereof, belonging to the field of nano materials.
Background
Carbon monoxide (CO) is one of the common atmospheric pollutants, mainly derived from fossil fuel combustion, industrial waste gas, automobile exhaust, and the like. There are various methods for eliminating CO, among them, the catalytic oxidation method is to oxidize CO into pollution-free carbon dioxide (CO) under the action of catalyst2). The conversion mode has the advantages of low operation temperature and high conversion efficiency, has small influence on the environment, can be used for environmental protection, also widely relates to the fields of energy, protection, industry and the like, and becomes the most important CO elimination method. The supported noble metal catalyst (including gold, silver and platinum metals) has high CO catalytic oxidation activity, but the surface energy of noble metal particles is high, and agglomeration is easy to occur in the reaction process to cause activity reduction, and the phenomenon is particularly obvious at high temperature, and good catalytic stability is difficult to maintain. Therefore, finding a suitable method to improve the high temperature sintering resistance of the supported noble metal catalyst becomes the key to improve the stability and the service performance of the supported noble metal catalyst.
Methods for improving the high-temperature sintering resistance of the supported noble metal catalyst mainly fall into two categories. One is a physical method, namely, the special shapes of carriers such as mesoporous carbon, zeolite molecular sieves and the like are utilized to limit noble metal particles in a pore channel and prevent the noble metal particles from migrating and agglomerating at high temperature, so that the method is also called as a pore channel confinement effect. Laursen et al dispersed Au nanoparticles into amorphous SiO2Then amorphous SiO is crystallized2Conversion to the zeolite phase achieved the limiting effect of zeolite molecular sieves on Au nanoparticles (Anders b. laursen et al. angelw. chem. int.ed.2010,122, 3582-3585.). The method has high requirements on the carrier and does not have universality. The other is a chemical method, namely, the strong interaction between metal and a carrier is utilized, and even the semi-coating effect of the carrier on metal particles is utilized to improve the high-temperature sintering resistance of the noble metal particles. Tang et al use hydroxyapatite composite titanium dioxide as a carrier to prepare an Au catalyst, and use the half-coating effect of hydroxyapatite on Au to prepare a high-stability supported Au catalyst (Haili)an Tang et al, Angew. chem. int.Ed.2016,55, 1-7). The method has high universality, but the high-temperature sintering resistance for a long time is difficult to form only by the strong interaction of metal-carrier, and the activity of the catalyst is inevitably influenced by the semi-coating effect. In summary, it has been difficult to prepare a supported noble metal catalyst having both high activity and high-temperature sintering resistance as a result of previous research, and particularly in the CO catalytic oxidation reaction, the service performance of the catalyst needs to be further improved.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant sintering supported noble metal catalyst for catalytic oxidation of carbon monoxide and a preparation method thereof. The catalyst can still maintain good catalytic oxidation activity after being roasted at 500 ℃, can realize complete CO conversion at normal temperature, and shows good high-temperature sintering resistance.
The specific technical scheme of the invention is as follows: a high-temp sintered load-type noble metal catalyst for catalytic oxidation of CO is composed of carrier (TiO), active component and coated shell layer2Or CeO2Nanoparticles, the active component being a noble metal (Au, Pt, Pd) and in TiO2The surface and the periphery of the noble metal are selectively coated with a layer of SiO2The shell layer plays a role in limiting and protecting the noble metal particles.
The invention aims to provide a high-temperature-resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide, wherein a carrier is TiO2Or CeO2The nano-particles have a particle size of 5-100 nm.
The invention aims to provide a high-temperature-resistant sintering supported noble metal catalyst for catalytic oxidation of carbon monoxide, wherein the active component is noble metal (Au, Pt and Pd) nanoparticles, the size is uniform, and the loading amount is 0.01-25 wt%.
Hair brushIt is an object of the invention to provide a high temperature resistant sintered supported noble metal catalyst for the catalytic oxidation of carbon monoxide, the SiO2The shell layer is coated on the TiO2The thickness of the carrier surface and the periphery of the noble metal nano particles is 1-20 nm, and the carrier surface and the periphery of the noble metal nano particles are not covered with the noble metal nano particles.
The invention provides a preparation method of a high-temperature-resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide, which belongs to a liquid phase method and comprises the following specific steps: firstly, the deposition-precipitation method is adopted to load noble metal nano particles on TiO2The above step (1); then protecting the noble metal particles by using a protective agent; finally SiO using Tetraethylorthosilicate (TEOS)2And coating the shell layer, and removing the protective agent by roasting, thereby preparing the high-temperature sintering resistant catalyst material.
The invention provides a preparation method of a high-temperature-resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide, belonging to a method of first loading and post-treatment.
The invention provides a preparation method of a high-temperature-resistant sintering load type noble metal catalyst for catalytic oxidation of carbon monoxide, wherein the noble metal protective agent can adopt n-dodecyl mercaptan, n-octadecyl mercaptan, oil ammonium and the like.
The invention provides a preparation method of a high-temperature-resistant sintering load type noble metal catalyst for catalytic oxidation of carbon monoxide, which has the following advantages:
1. the whole process is a liquid phase method, the method is simple, the condition is mild, the period is short, and the method is suitable for large-scale synthesis and has small influence on the environment.
2. The method belongs to a method of loading first and post-processing, and the post-processing method can be applied to various loaded noble metal catalysts, so that the method has universality and practicability.
3. The obtained supported noble metal catalyst has high activity and high-temperature sintering resistance, and the characteristic is derived from the combination of a physical method and a chemical method in the post-treatment process: SiO 22Selective coating of shellIn TiO2The surface and the periphery of the noble metal not only form a limiting effect on noble metal particles, but also can not cover the noble metal particles, thereby avoiding the influence on the activity; noble metal particles and TiO in the process of removing the protective agent by roasting2Strong interaction is formed between the carriers, and the sintering resistance is further improved.
4. The obtained catalyst still has good catalytic activity after being roasted at 500 ℃, can realize complete CO conversion at normal temperature, shows good sintering resistance, and can be widely applied to the industrial catalysis fields of automobile exhaust treatment and the like.
Drawings
FIG. 1 is a transmission electron microscope image of a high temperature resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide prepared by the invention. Wherein (a) represents an intermediate Au/TiO2Catalyst, (b) diagram shows the SiO coating2The finished product SiO obtained after the shell layer2/Au/TiO2Catalyst, SiO in the figure2The shell layer is clearly visible.
FIG. 2 is a transmission electron microscope image of a high temperature-resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide prepared by the invention after high temperature calcination. Wherein (a) represents an intermediate Au/TiO2Catalyst, (b) diagram shows the SiO coating2The finished product SiO obtained after the shell layer2/Au/TiO2A catalyst.
FIG. 3 shows the results of CO catalytic oxidation performance tests of the supported noble metal catalyst prepared by the present invention before and after high temperature calcination. Wherein (a) represents an intermediate Au/TiO2Catalyst, (b) diagram shows the SiO coating2The finished product SiO obtained after the shell layer2/Au/TiO2A catalyst.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings and examples, but the scope of the present invention should not be limited thereby.
The "ranges" disclosed herein are in the form of lower and upper limits. There may be one or more lower limits, and one or more upper limits, respectively. The given range is defined by the selection of a lower limit and an upper limit. The selected lower and upper limits define the boundaries of the particular range. All ranges that can be defined in this manner are inclusive and combinable, i.e., any lower limit can be combined with any upper limit to form a range. For example, ranges of 60-120 and 80-110 are listed for particular parameters, with the understanding that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if the minimum range values 1 and 2 are listed, and if the maximum ranges 3, 4, and 5 are listed, the following ranges are all contemplated: 1-2, 1-4, 1-5, 2-3, 2-4 and 2-5.
In the present invention, unless otherwise stated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "0 to 5" indicates that all real numbers between "0 to 5" have been listed herein, and "0 to 5" is only a shorthand representation of the combination of these numbers.
In the present invention, all embodiments and preferred embodiments mentioned herein may be combined with each other to form a new technical solution, if not specifically stated.
In the present invention, all the technical features mentioned herein and preferred features may be combined with each other to form new technical solutions, if not specifically mentioned.
The preferred embodiments of the present invention will be described in detail with reference to the following examples, but it should be understood that those skilled in the art can reasonably change, modify and combine the examples to obtain new embodiments without departing from the scope defined by the claims, and that the new embodiments obtained by changing, modifying and combining the examples are also included in the protection scope of the present invention.
The invention provides a high-temperature-resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide, which consists of a carrier, an active component and a coating shell layer. Wherein the carrier is TiO2Nanoparticles having a particle size of about 25 nm; the active component is noble metal (Au, Pt and Pd) nano particles, and the loading amount is about 1 wt%; the coating shell layer is SiO2Is relatively expensiveThe metal particles act as a confinement and protection.
The preparation method of the high-temperature-resistant sintering supported noble metal catalyst for catalytic oxidation of carbon monoxide comprises the following steps:
1. preparing a precursor of an active component noble metal (M) into 0.1mol L by deionized water-1508. mu.L of the solution was pipetted into a 100mL beaker, and 40mL of deionized water was added thereto and stirred well. With 0.1mol L- 1NaOH solution is used for adjusting the pH value of the solution to be approximately equal to 9, and 1g of carrier TiO is added under stirring2And with 0.1mol of L-1The NaOH solution maintained the pH of the solution approximately at 9 and held for 1 h. Heating to 65 deg.C, stirring for 1 hr, stopping stirring, centrifuging, washing the obtained product with deionized water for 3 times, drying in 60 deg.C oven for 24 hr to obtain M/TiO2A catalyst.
2. Measuring 40mL of absolute ethyl alcohol in a measuring cylinder, putting the absolute ethyl alcohol in a 100mL beaker, and sequentially adding 1mmol of protective agent and 0.2g M/TiO under stirring2Heating the catalyst to 60 deg.C, stirring for 30min, centrifuging, washing the obtained product with ethanol for 3 times, drying in 60 deg.C oven for 6 hr to obtain M/TiO adsorbed by the protectant2A catalyst.
3. 80mL of absolute ethyl alcohol and 20mL of deionized water are weighed by a measuring cylinder and put into a 250mL beaker, 1mL of 28 wt% ammonia water and 0.1g of catalyst are added, and the mixture is subjected to ultrasonic treatment for 30 min. Adding 10 μ L TEOS under stirring, stirring for 6 hr, centrifuging, washing the obtained product with ethanol for 3 times, drying in 0 deg.C oven for 6 hr to obtain SiO2/M/TiO2A catalyst.
The performance of the supported noble metal catalyst prepared by the invention is evaluated by combining a common fixed bed reactor with gas chromatography, and the composition of the raw material gas is 1 percent of CO +20 percent of O2+ 79% Ar (volume percentage), 50mg of the catalyst used and 500mg of quartz sand doped are charged into a fixed-bed reactor, and the composition analysis is carried out by gas chromatography on the gases passing through the reactor, and the CO conversion is calculated therefrom.
The following describes embodiments of the method of the invention:
example 1: SiO 22/Au/TiO2Catalyst and process for preparing same
HAuCl precursor of active component Au is added with deionized water4·3H2O is prepared into 0.1mol L-1508. mu.L of the solution was pipetted into a 100mL beaker, and 40mL of deionized water was added thereto and stirred well. With 0.1mol L-1NaOH solution is used for adjusting the pH value of the solution to be approximately equal to 9, and 1g of carrier TiO is added under stirring2And with 0.1mol of L-1The NaOH solution maintained the pH of the solution approximately at 9 and held for 1 h. Heating to 65 ℃, continuing stirring for 1h, stopping stirring, centrifuging, washing the obtained product with deionized water for 3 times, and drying in an oven at 60 ℃ for 24h to obtain Au/TiO2A catalyst. Measuring 40mL of absolute ethyl alcohol in a measuring cylinder, putting the absolute ethyl alcohol in a 100mL beaker, and sequentially adding 1mmol of n-dodecyl mercaptan and 0.2g of Au/TiO under stirring2Heating the catalyst to 60 ℃, keeping stirring for 30min, centrifuging, washing the obtained product with ethanol for 3 times, and drying in a 60 ℃ oven for 6h to obtain the mercaptan adsorbed Au/TiO2A catalyst. 80mL of absolute ethyl alcohol and 20mL of deionized water are weighed by a measuring cylinder and put into a 250mL beaker, 1mL of 28 wt% ammonia water and 0.1g of catalyst are added, and the mixture is subjected to ultrasonic treatment for 30 min. Adding 10 μ L TEOS under stirring, stirring for 6 hr, centrifuging, washing the obtained product with ethanol for 3 times, drying in 0 deg.C oven for 6 hr to obtain SiO2/Au/TiO2A catalyst.
Fig. 1 is a transmission electron microscope image of a high temperature resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide prepared by the present invention. Wherein (a) represents an intermediate Au/TiO2Catalyst, (b) diagram shows the SiO coating2The finished product SiO obtained after the shell layer2/Au/TiO2Catalyst, SiO in the figure2The shell layer is clearly visible.
FIG. 2 is a transmission electron microscope image of a high temperature-resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide prepared by the invention after high temperature calcination. Wherein (a) represents an intermediate Au/TiO2Catalyst, (b) diagram shows the SiO coating2The finished product SiO obtained after the shell layer2/Au/TiO2A catalyst.
FIG. 3 shows the reactivity of the supported noble metal catalyst prepared by the invention before and after high-temperature roasting for CO catalytic oxidationThe results can be tested. Wherein (a) represents an intermediate Au/TiO2Catalyst, (b) diagram shows the SiO coating2The finished product SiO obtained after the shell layer2/Au/TiO2A catalyst.
Example 2: SiO 22/Pt/TiO2Catalyst and process for preparing same
Using deionized water to prepare precursor H of active component Au2PtCI6·6H2O is prepared into 0.1mol L-1508. mu.L of the solution was pipetted into a 100mL beaker, and 40mL of deionized water was added thereto and stirred well. With 0.1mol L-1NaOH solution is used for adjusting the pH value of the solution to be approximately equal to 9, and 1g of carrier TiO is added under stirring2And with 0.1mol of L-1The NaOH solution maintained the pH of the solution approximately at 9 and held for 1 h. Heating to 65 ℃, continuing stirring for 1h, stopping stirring, centrifuging, washing the obtained product with deionized water for 3 times, and drying in a 60 ℃ oven for 24h to obtain Pt/TiO2A catalyst. Measuring 40mL of absolute ethyl alcohol in a measuring cylinder, putting the absolute ethyl alcohol in a 100mL beaker, and sequentially adding 1mmol of oily ammonium and 0.2g of Pt/TiO under stirring2Heating the catalyst to 60 ℃, keeping stirring for 30min, centrifuging, washing the obtained product with ethanol for 3 times, and drying in a 60 ℃ oven for 6h to obtain the Pt/TiO adsorbed by the oil ammonium2A catalyst. 80mL of absolute ethyl alcohol and 20mL of deionized water are weighed by a measuring cylinder and put into a 250mL beaker, 1mL of 28 wt% ammonia water and 0.1g of catalyst are added, and the mixture is subjected to ultrasonic treatment for 30 min. Adding 10 μ L TEOS under stirring, stirring for 6 hr, centrifuging, washing the obtained product with ethanol for 3 times, drying in 0 deg.C oven for 6 hr to obtain SiO2/Pt/TiO2A catalyst.
Example 3: SiO 22/Pd/TiO2Catalyst and process for preparing same
Using deionized water to prepare a precursor Na of an active component Au2PdCl40.1mol of L was prepared-1940. mu.L of the solution was pipetted into a 100mL beaker, and 40mL of deionized water was added thereto and stirred well. With 0.1mol L- 1NaOH solution is used for adjusting the pH value of the solution to be approximately equal to 9, and 1g of carrier TiO is added under stirring2And with 0.1mol of L-1The NaOH solution maintained the pH of the solution approximately at 9 and held for 1 h. Heating to 65 deg.C, andstirring for 1h, stopping stirring, centrifuging, washing the obtained product with deionized water for 3 times, and drying in an oven at 60 deg.C for 24h to obtain Pd/TiO2A catalyst. Measuring 40mL of absolute ethyl alcohol in a measuring cylinder, putting the absolute ethyl alcohol in a 100mL beaker, and sequentially adding 1mmol of oily ammonium and 0.2g of Pt/TiO under stirring2Heating the catalyst to 60 ℃ and keeping stirring for 30min, centrifuging, washing the obtained product with ethanol for 3 times, and drying in a 60 ℃ oven for 6h to obtain the oil ammonium adsorbed Pd/TiO2A catalyst. 80mL of absolute ethyl alcohol and 20mL of deionized water are weighed by a measuring cylinder and put into a 250mL beaker, 1mL of 28 wt% ammonia water and 0.1g of catalyst are added, and the mixture is subjected to ultrasonic treatment for 30 min. Adding 10 μ L TEOS under stirring, stirring for 6 hr, centrifuging, washing the obtained product with ethanol for 3 times, drying in 0 deg.C oven for 6 hr to obtain SiO2/Pd/TiO2A catalyst.
Example 4: SiO 22/Au/CeO2Catalyst and process for preparing same
HAuCl precursor of active component Au is added with deionized water4·3H2O is prepared into 0.1mol L-1508. mu.L of the solution was pipetted into a 100mL beaker, and 40mL of deionized water was added thereto and stirred well. With 0.1mol L-1NaOH solution is used for adjusting the pH value of the solution to be approximately equal to 9, and 1g of carrier CeO is added under stirring2And with 0.1mol of L-1The NaOH solution maintained the pH of the solution approximately at 9 and held for 1 h. Heating to 65 ℃, continuing stirring for 1h, stopping stirring, centrifuging, washing the obtained product with deionized water for 3 times, and drying in an oven at 60 ℃ for 24h to obtain Au/CeO2A catalyst. Measuring 40mL of absolute ethyl alcohol in a measuring cylinder, putting the absolute ethyl alcohol in a 100mL beaker, and sequentially adding 1mmol of n-dodecyl mercaptan and 0.2g of Au/CeO under stirring2Heating the catalyst to 60 ℃, keeping stirring for 30min, centrifuging, washing the obtained product with ethanol for 3 times, and drying in a 60 ℃ oven for 6h to obtain the mercaptan adsorbed Au/CeO2A catalyst. 80mL of absolute ethyl alcohol and 20mL of deionized water are weighed by a measuring cylinder and put into a 250mL beaker, 1mL of 28 wt% ammonia water and 0.1g of catalyst are added, and the mixture is subjected to ultrasonic treatment for 30 min. Adding 10 μ L TEOS under stirring, stirring for 6 hr, centrifuging, washing the obtained product with ethanol for 3 times, drying in 0 deg.C oven for 6 hr to obtain SiO2/Au/CeO2A catalyst.
Example 5: SiO 22/Pt/CeO2Catalyst and process for preparing same
Using deionized water to prepare precursor H of active component Au2PtCI6·6H2O is prepared into 0.1mol L-1508. mu.L of the solution was pipetted into a 100mL beaker, and 40mL of deionized water was added thereto and stirred well. With 0.1mol L-1NaOH solution is used for adjusting the pH value of the solution to be approximately equal to 9, and 1g of carrier CeO is added under stirring2And with 0.1mol of L-1The NaOH solution maintained the pH of the solution approximately at 9 and held for 1 h. Heating to 65 ℃, continuing stirring for 1h, stopping stirring, centrifuging, washing the obtained product with deionized water for 3 times, and drying in a 60 ℃ oven for 24h to obtain Pt/CeO2A catalyst. Measuring 40mL of absolute ethyl alcohol in a measuring cylinder, putting the absolute ethyl alcohol in a 100mL beaker, and sequentially adding 1mmol of oily ammonium and 0.2g of Pt/CeO under stirring2Heating the catalyst to 60 ℃, keeping stirring for 30min, centrifuging, washing the obtained product with ethanol for 3 times, and drying in a 60 ℃ oven for 6h to obtain oil ammonium adsorbed Pt/CeO2A catalyst. 80mL of absolute ethyl alcohol and 20mL of deionized water are weighed by a measuring cylinder and put into a 250mL beaker, 1mL of 28 wt% ammonia water and 0.1g of catalyst are added, and the mixture is subjected to ultrasonic treatment for 30 min. Adding 10 μ L TEOS under stirring, stirring for 6 hr, centrifuging, washing the obtained product with ethanol for 3 times, drying in 0 deg.C oven for 6 hr to obtain SiO2/Pt/CeO2A catalyst.
Example 3: SiO 22/Pd/CeO2Catalyst and process for preparing same
Using deionized water to prepare a precursor Na of an active component Au2PdCl40.1mol of L was prepared-1940. mu.L of the solution was pipetted into a 100mL beaker, and 40mL of deionized water was added thereto and stirred well. With 0.1mol L- 1NaOH solution is used for adjusting the pH value of the solution to be approximately equal to 9, and 1g of carrier CeO is added under stirring2And with 0.1mol of L-1The NaOH solution maintained the pH of the solution approximately at 9 and held for 1 h. Heating to 65 ℃, continuing stirring for 1h, stopping stirring, centrifuging, washing the obtained product with deionized water for 3 times, and drying in an oven at 60 ℃ for 24h to obtain Pd/CeO2A catalyst. 40mL of absolute ethyl alcohol is measured by a measuring cylinder and put in a 100mL beaker, and the absolute ethyl alcohol is stirred,adding 1mmol of oily ammonium and 0.2g of Pt/CeO in sequence2Heating the catalyst to 60 ℃, keeping stirring for 30min, centrifuging, washing the obtained product with ethanol for 3 times, and drying in a 60 ℃ oven for 6h to obtain the oil ammonium adsorbed Pd/CeO2A catalyst. 80mL of absolute ethyl alcohol and 20mL of deionized water are weighed by a measuring cylinder and put into a 250mL beaker, 1mL of 28 wt% ammonia water and 0.1g of catalyst are added, and the mixture is subjected to ultrasonic treatment for 30 min. Adding 10 μ L TEOS under stirring, stirring for 6 hr, centrifuging, washing the obtained product with ethanol for 3 times, drying in 0 deg.C oven for 6 hr to obtain SiO2/Pd/CeO2A catalyst.
Claims (4)
1. The high temperature sintering resistant supported noble metal catalyst for catalytic oxidation of carbon monoxide consists of carrier, active component and coated shell layer, and features that the carrier is TiO2Or CeO2A nanoparticle; the active component is a noble metal Au, Pt or Pd nano-particle; the active component is loaded on the surface of the carrier; the surface of the carrier nano-particles and the periphery of the active component noble metal nano-particles are coated with a coating shell layer which is SiO2A shell layer;
the preparation method of the high-temperature-resistant sintered supported noble metal catalyst belongs to a liquid phase method and comprises the following specific steps:
(1) the active component is noble metal Au, Pt or Pd nano-particles loaded on the TiO carrier by a deposition-precipitation method2Or CeO2On the nanoparticles;
(2) protecting the active component noble metal particles by using a protective agent; the protective agent adopts n-dodecyl mercaptan, n-octadecyl mercaptan or oleyl amine;
(3) SiO Using tetraethylorthosilicate2Coating a shell layer, and removing a protective agent by roasting to prepare the high-temperature-resistant sintered supported noble metal catalyst;
the adopted precursors are chloroauric acid, chloroplatinic acid or chloropalladic acid respectively.
2. The high temperature-resistant sintered supported noble metal catalyst for the catalytic oxidation of carbon monoxide according to claim 1, wherein the high temperature-resistant sintered supported noble metal catalyst is characterized in thatSaid support being TiO2Or CeO2The particle size of the nano-particles is 5-100 nm.
3. The high-temperature-resistant sintered supported noble metal catalyst for catalytic oxidation of carbon monoxide as claimed in claim 1, wherein the active component noble metal Au, Pt or Pd nanoparticles have uniform size and are loaded in an amount of 0.01-25 wt%.
4. The refractory sintered supported noble metal catalyst of claim 1, wherein the SiO is in the form of a powder2The thickness of the shell layer is 1-20 nm.
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