CN111974382B - Application of low-temperature CO oxidation or ADN decomposition platinum-based catalyst - Google Patents

Application of low-temperature CO oxidation or ADN decomposition platinum-based catalyst Download PDF

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CN111974382B
CN111974382B CN201910427727.0A CN201910427727A CN111974382B CN 111974382 B CN111974382 B CN 111974382B CN 201910427727 A CN201910427727 A CN 201910427727A CN 111974382 B CN111974382 B CN 111974382B
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CN111974382A (en
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王晓东
陈洋
林坚
吕飞
夏连根
张涛
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Dalian Institute of Chemical Physics of CAS
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Abstract

The invention relates to an alumina-supported platinum (Pt) catalyst, and a preparation method and application thereof. In particular to a composite catalyst which takes a single component Pt as an active center and takes inert alumina as a carrier. Wherein the platinum content is 0.5-5% of the total mass of the catalyst, the platinum is highly dispersed on the alumina in the form of clusters, and the cluster size is 0.5-3.0 nm. The catalyst is used for the oxidation elimination of carbon monoxide (CO) in an ultralow temperature environment (minus 80-0 ℃) and the purification of hydrogen sources used by a proton exchange membrane fuel cell power generation system. In particular, the catalyst of the present invention is also suitable for catalytically decomposing Ammonium Dinitramide (ADN) at low temperatures. The catalyst provided by the invention has the characteristics of simple preparation method, high selectivity and high stability, and has a good industrial application prospect.

Description

Application of low-temperature CO oxidation or ADN decomposition platinum-based catalyst
Technical Field
The invention relates to an alumina-supported platinum cluster catalyst and preparation and application thereof, wherein platinum is highly dispersed on alumina in a cluster form of 0.5-3.0 nm and is used as a unique active center to show higher catalytic performance in the oxidation of ultralow temperature carbon monoxide (CO) and the selective elimination of trace CO in a hydrogen source. The catalyst achieves Ammonium Dinitramide (ADN) decomposition at low temperature.
Background
CO oxidation is one of the most important and most widely studied catalytic processes. Wide CO source, high toxicity and wide explosion limit (12.5-74%), so it is environmentally friendly and suitable for use in industrial production 2 Laser, CO gas respirator, industrial application, elimination of CO in enclosed space and development of new energyThe method has very important application value in the aspects of fuel cell technology and the like. This reaction is particularly important for the catalytic conversion of automobile exhaust gases. However, the oxidation temperature of CO involved in the conversion process is often higher than 200 ℃, and most pollutants in the automobile exhaust are emitted within 30s of cold start at present, so that the development of a catalyst with low temperature and high activity is required. The U.S. department of energy has established a goal to reduce automotive processing temperatures below 150 ℃. The method aims to synthesize the CO oxidation catalyst with low temperature and high activity and has important practical application value. Meanwhile, with the development and popularization of new energy electric vehicles, the demand on power batteries is increasing day by day, and hydrogen energy fuel batteries have the advantages of wide sources, cleanness, no pollution, long one-time endurance and the like, and are competitive high points in the technical field of the future automobile industry. At present, the hydrogen source is mainly from industrial reforming process, wherein a small amount of CO can poison the electrode catalyst of the fuel cell, and the selective oxidation elimination of the visible CO has important significance for the development of the fuel cell and the improvement of the performance.
Platinum-based catalysts, being the most widely used catalysts, have important roles both in basic research and industrial applications, consuming 37-50% of the Pt world reserves annually (catalysts.2017, 7, 58). Researchers believe that high dispersion of Pt particles is the key to achieving high activity, but the catalyst prepared by the traditional wet chemical method has the complete CO conversion temperature higher than 60 ℃ and poor low-temperature activity. The preparation of the low-temperature CO oxidation catalyst with high dispersion, uniform size and high activity through the optimization of the preparation method and the modulation of the catalyst structure is still one of the hot spots and difficulties of the current catalytic research.
Selectxo was first developed and commercialized by Engelhard in 1963 TM (Pt/Al 2 O 3 ) The catalyst is used for purifying CO in hydrogen in ammonia synthesis industry, and then Pt/Al is treated 2 O 3 Catalysts have been extensively studied. Manasilp et Al Pt/Al prepared by the sol-gel method (appl.Catal.B: environmental.2002,37 2 O 3 Catalyst, study showed 2% of Pt/Al 2 O 3 The catalyst has CO converting rate up to 80% and selectivity up to 50% at 170 deg.c. Aluminum oxideThe supported single component Pt-based catalyst has a high optimum reaction temperature, and therefore, attempts have been made to add a second component to activate oxygen, thereby achieving CO oxidation under low temperature conditions. There are studies showing that the addition of transition metals Fe (science.2010, 328, 1141-1144.), ni (J.Am.chem.Soc.2011, 133, 1978-1986), co (Angew.chem.int.Ed.2007, 46, 734-737) to Pt/Al 2 O 3 The catalytic activity is promoted. In addition, minemura et Al (Chem Commun.2005, 1429-1431.) study found alkali metal ion addition to Pt/Al 2 O 3 The catalytic activity also has a remarkable promoting effect, but simultaneously brings about the problems of catalyst repeatability, corrosion to equipment in the practical application process and the like. While reducing noble metal loading to monoatomic dispersion increases metal utilization, it does not achieve oxidative elimination of CO at room temperature (Nature chemistry.2011,3, 634-641).
Therefore, attention has been directed to single metal active-center catalysts, primarily to inert support-supported Pt-based catalysts. Zhu et al (nat. Commun.2017,8 15291) found that complete conversion of CO can be achieved at 67 ℃ by making the BN surface vacancy rich and thus modulating the electronic properties of the Pt nanoparticles at the interface. In SiO 2 On supported Pt-based catalysts, studies have shown that complete conversion of CO is only achieved at 150 ℃ (science 2010,328,1141-1144. Peterson et Al (nat. Commun.2014,5 2 O 3 The carrier is beneficial to improving the catalytic activity and stability of Pt, but the complete CO conversion temperature is still higher than 150 ℃. Recently, newton et Al (nat. Commun.2015,6, 8675-9675, j.am. Chem.soc.2016,138, 13930-13940) found commercial 5% pt/Al 2 O 3 Catalyst for adsorbing CO and O 2 The Pt carbonate has low-temperature CO oxidation activity when being formed, but has poor room-temperature activity on the whole, and the carbonate can be completely decomposed by needing higher temperature. Therefore, no matter the Pt is modified by adding alkali metal and transition metal, or the carrier is modified by electronic regulation and doping, the complete oxidation of CO on the single Pt catalyst loaded by the inert carrier at room temperature or even ultralow temperature can not be realized.
At present, a propellant with high performance, environmental protection, no toxicity and low cost has wide application prospects in the fields of military affairs and aerospace, ADN (ammonium dinitramide) as one of novel high-energy green propellants represents a new research direction and development trend of space chemistry propulsion technology, and compared with a conventional AP (ammonium perchlorate) based propellant, the propellant has the advantages of high energy density, environmental protection, no toxicity, low characteristic signal, good safety performance, good thermal decomposition performance and the like, thereby causing high attention of people and becoming a research hotspot in the field of propellants in recent years. (researches on catalysis and surface modification of warrior ammonium dinitramide [ D ]. Nanjing: nanjing university of physical Engineers, 2006.) ADN catalytic decomposition technology is one of the key technologies, and simultaneously faces some difficulties, so that the popularization and the use of the novel environment-friendly propellant are determined. The invention reports the preparation of the inert alumina-supported platinum catalyst for the first time, and investigates the low-temperature CO (selective oxidation) oxidation elimination and ADN catalytic decomposition performance.
Disclosure of Invention
The invention aims to provide an inert carrier Al 2 O 3 The supported Pt catalyst has Pt highly dispersed on a carrier in a cluster form of 0.5-3.0 nm and is used as the only active center for CO oxidation, trace CO elimination in a hydrogen source and ADN catalytic decomposition at room temperature and in an extremely low temperature environment.
In order to achieve the purpose, the invention adopts the technical scheme that:
the CO oxidizing catalyst in room temperature and very low temperature environment consists of alumina and noble metal Pt in the Pt content of 0.1-5 wt%. The noble metal Pt is highly dispersed on the alumina.
The catalyst is prepared by adopting a colloid-deposition method, wherein a glycol solution of a Pt precursor is stirred and slowly added into a glycol solution of alumina, the volume ratio of the two solutions is 1.
The Pt precursor is preferably a chloroplatinic acid solution of Pt.
The carrier is alumina.
The required precipitation and aging temperature is preferably 70-80 ℃; the pH of the solution is preferably 8 to 10; the drying temperature of the catalyst is preferably 80 ℃ and the drying time is preferably 12 hours.
The catalyst can be used for CO oxidation elimination in low-temperature environment, realizes complete CO conversion at-20 ℃ and selectively oxidizes CO in hydrogen-rich atmosphere into CO at the temperature range of 0-200 DEG C 2 。
The catalyst is used for catalytic decomposition of ADN, realizes ADN decomposition at 25 ℃, and has good low-temperature activity.
The method for testing the CO oxidation activity of the catalyst comprises the following steps:
will contain 0.1 to 5vol.% CO,0.5 to 20vol.% O 2 At a space velocity of 1X 10 4 ～1×10 5 mL g cat . -1 h -1 Introducing the mixture into a fixed bed reactor filled with a catalyst, and measuring the activity of the catalyst for CO oxidation from-80 ℃ temperature programming under normal pressure.
The rapid decomposition test method for ADN of the catalyst of the present invention is as follows:
injecting 100 mu LADN propellant on the catalyst in the reactor at the low temperature of 25 ℃, decomposing ADN fuel, recording the change data of temperature and pressure along with time, injecting again after the temperature is reduced to 25 ℃, carrying out reaction for 4 times, and counting the decomposition process, thereby evaluating the stability of the catalyst.
Compared with the prior art, the invention has the substantive characteristics that:
1. the catalyst prepared by the invention has the characteristic of high dispersion of the active component, and the obtained Pt cluster has controllable size and uniform dispersion, thereby being beneficial to improving the activity of the catalyst and improving the utilization rate of the active component Pt. The content of the noble metal Pt is reduced, so that the cost of the catalyst is reduced.
2. The catalyst uses inert alumina as a support with Pt as the only active center.
3. The catalyst has excellent low-temperature catalytic oxidation performance, and is firstly in Pt/Al 2 O 3 The complete oxidation of CO at the temperature of minus 20 ℃ is realized, the conversion rate of CO in the hydrogen-rich atmosphere is 100 percent within the temperature range of 0 to 200 ℃, and the method has important significance for the oxidation elimination of trace CO in the automobile exhaust and the hydrogen source under the actual condition。
4. The catalyst has good activity in the catalytic decomposition of ADN aqueous solution, realizes the ADN catalytic decomposition at 25 ℃, and has good low-temperature activity.
Drawings
FIG. 1 is a comparison of the CO oxidation activity of the catalysts prepared in examples 1, 2, 7 of the present invention with the commercial catalyst in comparative example 1.
FIG. 2 shows the catalysts prepared in examples 1, 7, 9 and 10 of the present invention and the standard Au/Al in comparative example 2 2 O 3 CO oxidation activity of the catalysts was compared.
FIG. 3 is a TOF comparison of catalysts prepared in examples 1 and 7 of the present invention with commercial catalysts in comparative examples 1 and 2.
FIG. 4 shows the catalysts prepared in examples 1 and 7 of the present invention and commercial Pt/Al catalyst in comparative example 1 2 O 3 The CO selective oxidation reactivity of the catalyst.
FIG. 5 shows the stability of the selective CO oxidation reaction at 80 ℃ for the catalyst prepared in example 7 of the present invention.
FIG. 6 is a graph of CO conversion as a function of oxygen concentration for a catalyst prepared in example 7 of the present invention FIG. 6A and CO 2 Alternative fig. 6B.
FIG. 7 shows commercial Pt/Al in example 7 of the present invention and comparative example 1 2 O 3 And (5) catalyst XRD result.
FIG. 8 shows commercial Pt/Al in examples 1, 2, and 7 of the present invention and comparative example 1 2 O 3 HAADF-STEM pictures and particle size statistics of the catalyst.
FIG. 9 is 2.5wt% Pt/Al prepared in example 7 of the present invention 2 O 3 The catalyst is used for ADN catalytic decomposition at 25 ℃.
Detailed Description
The following examples are intended to illustrate the invention in more detail and are not intended to limit the scope of the invention.
Example 1:
dissolving 1g of chloroplatinic acid in 50ml of ethylene glycol solution, adding the solution into a three-neck flask under the protection of Ar gas, adding NaOH (50ml, 0.5M) into the alcoholic solution of the chloroplatinic acid (1 g), stirring to obtain a transparent yellow Pt colloidal solution, then heating to 140 ℃ for 3 hours, and carrying water and organic by-products away in the system through Ar gas and condensation reflux. Obtaining the dark brown Pt cluster colloidal solution with the uniform size of 0.5-1.3 nm, wherein the concentration of Pt in the sol is 3.7mg/ml.
Example 2:
except for example 1 where the added NaOH was 50ml and 0.3M, the other conditions and materials were the same as in example 1, and the Pt cluster sol size was 2.7. + -. 0.6nm. The test conditions for the catalyst used for low temperature CO oxidation were consistent with example 15.
Example 3:
except for the difference from example 1 in that the heating temperature was 160 ℃ and the mass of chloroplatinic acid was 0.27g, the other conditions and materials were the same as in example 1, and the size of the Pt cluster sol was 0.5. + -. 0.3nm.
Example 4:
except for dissolving platinum tetraammine nitrate in the ethylene glycol solution as in example 1, the other conditions and materials were the same as in example 1, to obtain a dark brown Pt cluster colloidal solution of 0.5 to 1.3nm in size.
Example 5: except that tetraammineplatinum hydroxide was dissolved in an ethylene glycol solution as in example 1, and the other conditions and materials were the same as in example 1, a dark brown Pt cluster colloidal solution having a size of 0.5 to 1.3nm was obtained.
Example 6:
except that acetylacetone platinum was dissolved in an ethylene glycol solution, and other conditions and materials were the same as in example 1, to obtain a dark brown Pt cluster colloidal solution having a size of 0.5 to 1.3 nm.
Example 7:
dispersing 1g of gamma-alumina carrier in 100mL of glycol solution, stirring in 80 ℃ water bath, taking 6.76mL of the Pt cluster colloidal solution of 3.7mg/mL of example 1, adding 100mL of glycol for dilution, slowly adding the Pt cluster colloidal solution into the carrier alcohol solution under strong stirring, adjusting the pH value to 9.5 by 0.1M NaOH, stirring for 3h at 80 ℃, standing for 1h, carrying out suction filtration, washing by hot ultrapure water, and drying for 16h in an oven at 80 ℃ to obtain 2.5wt.% of Pt/gamma-Al 2 O 3 Catalyst used for the oxidation evaluation of carbon monoxide at very low temperatureThe test results show that 2.5wt.% Pt/γ -Al prepared by this method 2 O 3 The catalyst has excellent low-temperature performance and realizes complete CO conversion at-20 ℃. The test conditions were: the catalyst was used in an amount of 100mg and the gas volume composition was 1vol.% CO +1vol.% O 2 + He, total gas flow 30ml/min (STP), mass space velocity 1.8X 10 4 mL g cat -1 h -1 Catalyst pre-test at 10vol.% H 2 Reducing at 200 ℃ for 0.5h under the atmosphere of/He, purging with He to reduce to room temperature, keeping the temperature of each temperature point to be detected constant for 20min, sampling, detecting the gas composition at the outlet of the reactor by adopting chromatography, and calculating the conversion rate.
Example 8:
except for taking 1.35mL of 3.7mg/mL Pt cluster colloidal solution of example 1 as in example 7, the other conditions and materials were the same as in example 7 to give 0.5wt.% Pt/Al 2 O 3 A catalyst.
Example 9:
different from example 7 in that 2.16mL of the 3.7mg/mL Pt cluster colloid solution of example 1 was used, and other conditions and materials were the same as example 7, 0.8wt.% Pt/Al was obtained 2 O 3 A catalyst. The test conditions for the catalyst used for low temperature CO oxidation were consistent with example 15.
Example 10:
in contrast to example 7, taking 13.5mL of the 3.7mg/mL Pt cluster colloid solution of example 1, the other conditions and materials were the same as in example 7, 5wt.% Pt/Al was obtained 2 O 3 A catalyst. The test conditions for the catalyst used for low temperature CO oxidation were in accordance with example 15.
Example 11:
in contrast to example 7, the pH of the solution was adjusted to 13 using 0.5M NaOH, and the other conditions and materials were the same as in example 7, to give 2.5wt.% Pt/Al 2 O 3 A catalyst.
Example 12:
in contrast to example 7, in which no NaOH was added after loading and the pH was 7, the other conditions and materials were the same as in example 7, giving 2.5wt.% Pt/Al 2 O 3 A catalyst.
Example 13:
in contrast to example 7, 0.1M sodium carbonate (Na) was used 2 CO 3 ) The pH of the solution was adjusted to 9.5 and the other conditions and materials were the same as in example 7 to give 2.5wt.% Pt/Al 2 O 3 A catalyst.
Example 14:
in contrast to example 7, 0.1M ammonia was used to adjust the pH of the solution to 9.5, and the other conditions and materials were the same as in example 7 to obtain 2.5wt.% Pt/Al 2 O 3 A catalyst.
Comparative example 1:
commercial 5wt% of Pt/Al 2 O 3 (Sigma-Aldrich) catalyst. The results of the selective oxidation reaction evaluation of this catalyst for low temperature carbon monoxide oxidation and trace CO in hydrogen source are shown in FIGS. 1 and 4, and the test results show commercial 5wt% Pt/Al 2 O 3 The catalyst was to achieve complete conversion of CO at 140 ℃ and 2.5wt% Pt/Al as prepared in our example 7 2 O 3 Catalyst CO complete conversion temperature 160 ℃ lower than commercial catalyst, indicating commercial 5wt% 2 O 3 The catalyst activity is poor. The test conditions of FIG. 1 were identical to those of example 15. The test conditions of FIG. 4 are in accordance with those of example 17.
Comparative example 2:
standard 0.7wt% of Au/Al purchased 2 O 3 (Haruta Company) catalyst. The results of the evaluation of the catalyst for low-temperature carbon monoxide oxidation reaction are shown in FIG. 2, and the results of the test show that 0.7wt% of standard Au/Al 2 O 3 (Haruta Company) catalyst achieved complete conversion of CO at 50 ℃ while the near loading, 0.8wt% of our example 9 preparation 2 O 3 The catalyst can realize complete conversion of CO at 40 ℃, which shows that the low-temperature catalytic activity of the catalyst is equivalent to that of the Au catalyst. The test conditions were identical to those of example 15.
Example 15:
and (3) carrying out CO oxidation activity test on the catalyst by adopting a fixed bed micro-reverse evaluation device. The test conditions were: the catalyst was used in an amount of 100mg and the gas volume composition was 1vol.% CO +1vol.% O 2 + He, total gas flow 30ml/min (STP), mass space velocity 1.8X 10 4 mL g cat -1 h -1 Catalyst pre-test at 10vol.% H 2 Reducing at 200 ℃ for 0.5h under the atmosphere of/He, purging with He to reduce to room temperature, keeping the temperature of each temperature point to be measured constant for 20min, sampling, detecting the gas composition at the outlet of the reactor by adopting chromatography, and calculating the conversion rate.
The CO conversion was calculated as follows:
CO Conversion(％)＝{([CO]in–[CO]out)/[CO]in}×100％
wherein: [ CO ] in, [ CO ] out are the CO chromatographic peak areas of the feed and the reactor outlet, respectively.
Example 16: investigating the influence of the Pt loading of the noble metal on the CO oxidation activity
Taking 100mg of 0.5 to 5wt% of example 7, example 9, example 10 and comparative example 2 2 O 3 And 0.7wt% of Au/Al 2 O 3 The catalysts were separately placed in quartz reaction tubes, and the catalysts were made to be 10vol% H before the reaction was carried out 2 Reducing for 0.5h at 200 ℃ under the atmosphere of/He, blowing to room temperature by He, and evaluating the carbon monoxide oxidation reaction of the pretreated catalyst. The result is shown in figure 2, and the test result shows that the low-temperature activity of the catalyst is improved by increasing the Pt loading amount, the complete CO conversion at-60 ℃ is realized when the Pt loading amount is 5wt%, and the catalyst has good low-temperature CO oxidation performance.
Example 17: investigating the carbon monoxide selective oxidation performance of the catalyst
100mg of the catalysts of example 7 and comparative example 1 were each placed in a quartz reaction tube with a gas volume composition of 1vol.% CO +1vol.% O 2 +40vol％H 2 + He, total gas flow 33.3ml/min (STP), mass space velocity 2.0X 10 4 mL g cat -1 h -1 Catalyst pre-test at 10vol.% H 2 Reducing for 0.5h at 200 ℃ under the atmosphere of/He, blowing the He to reduce to the room temperature, and using the pretreated catalyst for evaluating the selective oxidation reaction of the carbon monoxide. The results are shown in FIG. 4, which shows that the catalyst prepared by us can realize complete CO conversion at the temperature range of 0-200 ℃, while the commercial catalyst is at 140-220 DEG CThe conversion rate of CO is 100%, the complete conversion temperature range of the commercial catalyst CO is narrow, and the reaction temperature is high.
Example 18: investigating CO/O in the reaction atmosphere 2 Effect of the ratio on the Activity
Taking 100mg of 2.5wt% of example 7, pt/Al 2 O 3 Catalyst in quartz reactor tube, pre-catalyst at 10vol.% H 2 Reducing for 0.5h at 200 ℃ under the atmosphere of/He, blowing the He to reduce to the room temperature, and using the pretreated catalyst for the evaluation of the selective oxidation reaction of carbon monoxide under the condition of CO/O 2 The ratio is 0.8-2, he is balance gas, the total flow rate of the reaction gas is 33.3ml/min, the evaluation result is shown in figure 4, when CO/O 2 In ratio 2, CO 2 The selectivity was 100% at a temperature range of-30 to 200 ℃ indicating that we prepared 2.5wt% Pt/Al 2 O 3 The catalyst has good catalytic activity and selectivity.
Example 19: evaluation of catalyst stability
Taking 100mg of 2.5wt% of example 7, pt/Al 2 O 3 The catalyst was placed in a quartz reaction tube, and the catalyst was calculated at 10vol% before the reaction 2 Reducing the catalyst for 0.5h at 200 ℃ in a/He atmosphere, purging the catalyst for room temperature by He, and evaluating the selectivity oxidation reaction of the carbon monoxide by using the pretreated catalyst, wherein the stability test result of the catalyst is shown in figure 5, and the activity of the catalyst is not obviously changed within 20h, which shows that the catalyst has good stability.
Example 20: ADN catalytic decomposition test 2.5wt% of Pt/Al of example 7 into a reactor at a Low temperature of 25 ℃ 2 O 3 Injecting 100 mu LADN propellant on the catalyst, decomposing ADN fuel, recording the change data of temperature and pressure along with time, injecting again after the temperature is reduced to 25 ℃, reacting for 4 times, counting the decomposition process, and evaluating the stability of the catalyst. The test result is shown in fig. 9, and it can be seen from the figure that the catalyst realizes ADN decomposition at a low temperature of 25 ℃, indicating that the catalyst has good low-temperature activity.

Claims (6)

1. The application of a platinum-based catalyst for low-temperature CO oxidation or ADN decomposition is characterized in that:
the platinum-based catalyst is used for CO oxidation: the complete conversion of CO can be realized when the catalytic temperature is-20-100 ℃;
alternatively, platinum-based catalysts are used for the selective oxidation of CO: and CO is selectively eliminated in hydrogen-rich atmosphere with the volume content of 40 vol% of H at the temperature range of 0-200 DEG C 2 And the above hydrogen-containing atmosphere;
alternatively, platinum-based catalysts are used for the catalytic decomposition of ammonium dinitramide ADN: the decomposition of ADN can be realized at the catalytic temperature of 25-200 ℃;
the platinum-based catalyst is prepared by adopting a colloid-deposition two-step method, and the specific process comprises the following steps:
(1) Reduction of Pt precursor by ethylene glycol in inert atmosphere: dissolving a Pt precursor in an ethylene glycol solution, adding alkali to adjust the pH value to 10-13, stirring and reacting at 120-160 ℃, and heating for 1-3 h to obtain a dark brown Pt sol solution;
(2) Dispersing alumina into ethylene glycol, then slowly adding a Pt sol solution, adjusting the pH value to 8-10 by adding an alkali solution according to the volume ratio of 1-1;
the reduction treatment comprises the following steps: through 1-100 vol% of H 2 He, reducing for 0.5-3 h at 200-400 ℃;
platinum is uniformly dispersed on the alumina carrier in a cluster form, and the cluster size is 0.5-1.3 nm.
2. Use according to claim 1, characterized in that:
when the platinum-based catalyst is used for CO oxidation, the complete conversion of CO can be realized at the catalytic temperature of-20-60 ℃;
when the platinum-based catalyst is used for CO selective oxidation, CO in a hydrogen-rich atmosphere is selectively eliminated within the temperature range of 0-120 ℃;
when the platinum-based catalyst is used for catalytic decomposition of Ammonium Dinitramide (ADN), the decomposition of the ADN can be realized at the catalytic temperature of 25-100 ℃.
3. Use according to claim 1, characterized in that:
when the platinum-based catalyst is used for CO selective oxidation, CO in a hydrogen-rich atmosphere is selectively eliminated within the temperature range of 0-90 ℃.
4. Use according to claim 1, characterized in that: the platinum-based catalyst consists of alumina and noble metal platinum, wherein the alumina is a carrier, the platinum is a unique active component, and the platinum content accounts for 0.5-5% of the total mass of the catalyst.
5. Use of a catalyst according to claim 1, characterized in that: the Pt precursor is chloroplatinic acid, tetramine platinum nitrate, tetramine platinum hydroxide or acetylacetone platinum; the concentration of Pt in the Pt sol solution is 0.1-5 mg/mL;
the alkali solution is 0.1-0.5M sodium hydroxide, 0.1-1.0M sodium carbonate or 5-18M ammonia solution.
6. Use of a catalyst according to claim 1, characterized in that: the catalyst is subjected to 1-100 vol% of H 2 The gas flow rate is 20-100 mL/min during the reduction of the/He.
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