CN115582147A - Catalyst and preparation method and application thereof - Google Patents
Catalyst and preparation method and application thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title abstract description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 54
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 239000012621 metal-organic framework Substances 0.000 claims abstract description 19
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
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- 238000003756 stirring Methods 0.000 claims description 40
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- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 33
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 claims description 22
- 238000007254 oxidation reaction Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/1691—Coordination polymers, e.g. metal-organic frameworks [MOF]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/22—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/502—Carbon monoxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
- B01J2231/70—Oxidation reactions, e.g. epoxidation, (di)hydroxylation, dehydrogenation and analogues
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/60—Complexes comprising metals of Group VI (VIA or VIB) as the central metal
- B01J2531/62—Chromium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The application relates to a catalyst, a preparation method and application thereof. A catalyst, metal platinum and metal nickel are loaded on a metal organic framework material. The introduction of the second metal Ni can improve the catalytic capability, reduce the consumption of noble metal and save the cost of the catalyst. The catalyst is simple to operate, the reaction conditions are mild, and compared with other Pt-based catalysts, the catalyst does not need a high-temperature calcination process.
Description
Technical Field
The application relates to the technical field of purification of gaseous pollutants, in particular to a catalyst and a preparation method and application thereof.
Background
The pollutant carbon monoxide (CO) is an invisible killer and widely comes from occasions such as automobile exhaust emission, industrial production, mine exploitation and the like. When the content of the active ingredients in the air is higher than 0.1%, the human body can be poisoned. On the other hand, H 2 Is the main fuel of the proton exchange membrane fuel cell when H 2 In the presence of a trace amount of CO, the Pt electrode is poisoned or deactivated, and the CO and H are mixed 2 Compete for O 2 The fuel cell performance is reduced. Therefore, the elimination of CO is extremely important for environmental protection, human health, and the development of new energy. Among the existing methods for eliminating CO, the catalytic oxidation method under the action of a catalyst is the most convenient and effective method at present. In addition, the CO catalytic oxidation reaction is also a probe reaction for researching the catalyst structure. Therefore, the research on CO catalytic oxidation has important theoretical significance and practical significance.
Noble metals are considered the first catalysts for catalytic oxidation of CO due to their high catalytic activity. Among them, the Pt catalyst is the one which was used at the earliest and widely used, but activation of oxygen is inhibited by strong chemisorption of CO to Pt, so that O is generated 2 Is inhibited, resulting in poor catalytic activity at low temperatures, and is therefore widely used in high temperature CO oxidation (c)>200 deg.C). The Pt is used as a main active component, and the second metal element is doped, so that the activity and the anti-poisoning capability of the catalyst can be improved. The doping cost of the noble metal is higher, while the doping of the base metal can greatly reduce the cost of the catalyst and improve the utilization rate of Pt. On the other hand, the larger the specific surface area of the support, the larger the pore volume, the better the dispersion of the active component and the better the catalytic performance. The metal-organic framework material MIL-101 (Cr) has extremely large specific surface area and pore volume and can be stably stored in airThe catalyst carrier is a good catalyst carrier.
Disclosure of Invention
The application aims to provide a preparation method of a metal organic framework material MIL-101 (Cr) loaded Pt and Ni catalyst and an application thereof in CO oxidation reaction, and particularly to improve the low-temperature activity of the catalyst. The method takes MIL-101 (Cr) as a carrier to prepare the supported Pt catalyst, basically adopts a dual-function mechanism, and adds second metal Ni to change the surface chemical property of Pt, so that the low-temperature CO catalytic oxidation activity of the catalyst is improved.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a catalyst is prepared through loading Pt and Ni on the metal-organic skeleton.
The total amount of the platinum and the nickel loaded on each 100mg of the metal organic framework material of the catalyst is 0.005-0.025 mmol.
The catalyst is preferably MIL-101 (Cr) which is a metal organic framework material.
The mole ratio of the metal platinum to the metal nickel is preferably (3-7) to (7-3).
The mole ratio of the metal platinum to the metal nickel is preferably 3:7 or 1: 3.
the catalyst is preferably prepared by the following two-solvent impregnation method,
adding the activated metal organic framework into a methylcyclohexane solution, uniformly dispersing, and adding H 2 PtCl 6 ·6H 2 O solution and C 4 H 6 NiO 4 ·4H 2 O solution, stirring at room temperature, decanting to separate, drying the bottom product, and adding NaBH 4 Stirring the solution, centrifugally separating, washing and drying.
Said catalyst, preferably NaBH 4 The solution concentration is 0.6 mol.L -1 。
The catalyst is preferably prepared by adding the activated metal organic framework into 40mL of methylcyclohexane solution, performing ultrasonic treatment for 20min, and adding H under the conditions of room temperature and stirring 2 PtCl 6 ·6H 2 O and C 4 H 6 NiO 4 ·4H 2 O precursor solution is stirred for 120min, separated by decantation, and the bottom product is dried in vacuum at 150 ℃ overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Stirring the solution for 60min, centrifuging, washing with deionized water for 3 times, and vacuum drying at 120 deg.C for 6h.
The catalyst is applied to the oxidation reaction of carbon monoxide.
The catalyst is used as a catalyst in the oxidation reaction of carbon monoxide.
The beneficial effect of this application:
the supported Pt-based catalyst is prepared by selecting a metal organic framework material MIL-101 (Cr) with large specific surface area and rich pore channel structure as a carrier. The carrier with large specific surface area can better disperse the active components and obtain good catalytic effect in the reaction.
The supported Pt catalyst has better oxidation activity, but the catalytic activity at low temperature is poor, the conversion rate at 120 ℃ is only 8 percent, and Pt obtained by introducing second metal Ni 0.5 Ni 0.5 The MIL-101 (Cr) catalyst also obtains good catalytic activity, and obviously improves the low-temperature catalytic activity, and the conversion rate at 120 ℃ can reach 55%.
The introduction of the second metal Ni can improve the catalytic capability, reduce the consumption of noble metal and save the cost of the catalyst.
The catalyst is simple to operate, the reaction conditions are mild, and compared with other Pt-based catalysts, the catalyst does not need a high-temperature calcination process.
Drawings
FIG. 1 shows the MIL-101 (Cr) support prepared in example 1 of the present application and Pt/MIL-101 (Cr), pt prepared in examples 2 to 4 0.5 Ni 0.5 XRD patterns of/MIL-101 (Cr), ni/MIL-101 (Cr) catalysts;
FIG. 2 (a) is a Scanning Electron Microscope (SEM) of the MIL-101 (Cr) carrier prepared in example 1; (b) Scanning Electron Microscope (SEM) for Pt/MIL-101 (Cr) prepared in example 2; (c) Pt prepared for example 3 0.5 Ni 0.5 Scanning Electron Microscope (SEM) for MIL-101 (Cr); (d) Scan electrode for Ni/MIL-101 (Cr) catalyst prepared in example 4A mirror (SEM) view;
FIG. 3 shows Pt/MIL-101 (Cr) and Pt prepared in examples 2 to 6 of the present application 0.5 Ni 0.5 /MIL-101(Cr)、Ni/MIL-101(Cr)、Pt 0.7 Ni 0.3 /MIL-101(Cr)、Pt 0.3 Ni 0.7 CO oxidation reaction performance test chart of/MIL-101 (Cr) target catalyst;
FIG. 4 is a graph of Pt for different total metal contents prepared in examples 3, 7 and 8 of the present application 0.5 Ni 0.5 /MIL-101(Cr)、0.5Pt 0.5 Ni 0.5 MIL-101 (Cr) and 0.2Pt 0.5 Ni 0.5 A CO oxidation reaction performance test chart of the MIL-101 (Cr) target catalyst;
FIG. 5 shows Pt prepared in example 3 of the present application 0.5 Ni 0.5 CO oxidation stability test chart of MIL-101 (Cr) catalyst;
FIG. 6 shows Pt/MIL-101 (Cr) prepared in example 2 and Pt prepared in example 3 of the present application 0.5 Ni 0.5 CO adsorption in situ IR spectrum of/MIL-101 (Cr) catalyst.
Detailed Description
The following examples are provided to describe the present application in detail, but the present application is not limited to these examples.
Example 1: obtaining MIL-101 (Cr) carrier
The MIL-101 (Cr) carrier used in the scheme of the application can be purchased from commercial products or prepared by self, and the MIL-101 (Cr) carrier obtained by two ways has no difference in use for the technical scheme of the application. The following illustrates the preparation process in the case of self-preparation.
Weighing Cr (NO) 3 ) 3 ·9H 2 O、H 2 BDC, HF and H 2 O(Cr(NO 3 ) 3 ·9H 2 O：H 2 BDC：HF：H 2 O =1:1:1:265 Placing the mixture into a beaker, stirring and mixing the mixture at room temperature uniformly, then pouring the mixed solution into a hydrothermal kettle, and sealing the kettle; crystallizing in a 220 ℃ oven at constant temperature for 8h, naturally cooling to room temperature, taking out, filtering the product, and washing to obtain a crude product; the crude product is sequentially subjected to thermal treatment with 100 ℃ ethanol solvent for 20h and 60 ℃ NH 4 Stirring the solution F for 10 hours, filtering and washingWashing, and drying at 60 ℃ in vacuum overnight to obtain the MIL-101 (Cr) carrier. The XRD test of the carrier is carried out, as shown in figure 1, and the obtained spectrogram is consistent with the simulated spectrogram, which shows that the material has a high-purity MIL-101 (Cr) crystal structure. The material was subjected to SEM test, and as shown in FIG. 2 (a), the sample had an octahedral morphology, a smooth surface and a size of about 0.5. Mu.m.
Example 2: preparation of Pt/MIL-101 (Cr) catalyst
The activated MIL-101 (Cr) carrier is added into 40mL of methylcyclohexane solution and subjected to ultrasonic treatment for 20min. To this suspension H was added with stirring at room temperature 2 PtCl 6 ·6H 2 O precursor solution with total metal content of 0.025mmol/100mg MOF, stirring for 120min, decanting for separation, and vacuum drying the bottom product at 150 deg.C overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Solution, naBH 4 The solution concentration is 0.6 mol.L -1 And continuously stirring for 60min, centrifugally separating, washing for 3 times by using deionized water, and performing vacuum drying for 6h at 120 ℃ to obtain the target catalyst.
When the target catalyst is subjected to XRD test, as shown in the test of figure 1, the obtained spectrogram is consistent with the spectrogram of the MIL-101 (Cr) carrier, and no obvious metal diffraction peak appears, so that the loading of metal nano particles does not influence the crystal structure of the MIL-101 (Cr) and small-particle nano particles are highly dispersed on the MIL-101 (Cr) carrier. SEM test was performed, and the result is shown in FIG. 2 (b), where the sample surface was smooth and the morphology and size were close to those of the carrier.
Example 3: preparation of Pt 0.5 Ni 0.5 MIL-101 (Cr) catalyst
The activated MIL-101 (Cr) carrier is added into 40mL of methylcyclohexane solution and subjected to ultrasonic treatment for 20min. To this suspension H was added with stirring at room temperature 2 PtCl 6 ·6H 2 O and C 4 H 6 NiO 4 ·4H 2 O precursor solution, the total content of metal is 0.025mmol/100mg MOF, the content ratio (molar ratio) of Pt to Ni is 0.5:0.5, stirring for 120min, decanting and separating, and vacuum drying the bottom product at 150 deg.C overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Solution, naBH 4 The solution concentration is 0.6 mol.L -1 And continuously stirring for 60min, centrifugally separating, washing for 3 times by using deionized water, and performing vacuum drying for 6h at 120 ℃ to obtain the target catalyst.
When the target catalyst is subjected to XRD test, as shown in figure 1, the obtained spectrogram is consistent with the spectrogram of the MIL-101 (Cr) carrier, and no obvious metal diffraction peak appears, which indicates that the loading of the metal nano particles does not influence the crystal structure of the MIL-101 (Cr) and small particles of the nano particles are highly dispersed on the MIL-101 (Cr) carrier. SEM test was conducted, and the result is shown in FIG. 2 (c), where the sample surface was smooth and the morphology and size were close to those of the carrier.
Example 4: preparation of Ni/MIL-101 (Cr) catalyst
The activated MIL-101 (Cr) carrier is added into 40mL of methylcyclohexane solution and subjected to ultrasonic treatment for 20min. To this suspension C was added with stirring at room temperature 4 H 6 NiO 4 ·4H 2 O precursor solution with total metal content of 0.025mmol/100mg MOF, stirring for 120min, decanting to separate, and vacuum drying the bottom product at 150 deg.C overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Solution, naBH 4 The solution concentration is 0.6 mol.L -1 And continuously stirring for 60min, performing centrifugal separation, washing for 3 times by using deionized water, and performing vacuum drying for 6h at 120 ℃ to obtain the target catalyst.
When the target catalyst is subjected to XRD test, as shown in the test of figure 1, the obtained spectrogram is consistent with the spectrogram of the MIL-101 (Cr) carrier, and no obvious metal diffraction peak appears, so that the loading of metal nano particles does not influence the crystal structure of the MIL-101 (Cr) and small-particle nano particles are highly dispersed on the MIL-101 (Cr) carrier. SEM test was performed, and the result is shown in FIG. 2 (d), where the sample surface was smooth and the morphology and size were close to those of the carrier.
Example 5: preparation of Pt 0.7 Ni 0.3 MIL-101 (Cr) catalyst
The activated MIL-101 (Cr) carrier is added into 40mL of methylcyclohexane solution and subjected to ultrasonic treatment for 20min. To this suspension H was added with stirring at room temperature 2 PtCl 6 ·6H 2 O and C 4 H 6 NiO 4 ·4H 2 O precursorSolution, total content of metals 0.025mmol/100mg mof, content ratio (molar ratio) of pt to Ni 0.7:0.3, continuing to stir for 120min, decanting and separating, and vacuum drying the bottom product at 150 ℃ overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Solution, naBH 4 The solution concentration is 0.6 mol.L -1 And continuously stirring for 60min, performing centrifugal separation, washing for 3 times by using deionized water, and performing vacuum drying for 6h at 120 ℃ to obtain the target catalyst.
Example 6: preparation of Pt 0.3 Ni 0.7 MIL-101 (Cr) catalyst
The activated MIL-101 (Cr) carrier is added into 40mL of methylcyclohexane solution and subjected to ultrasonic treatment for 20min. To this suspension H was added with stirring at room temperature 2 PtCl 6 ·6H 2 O and C 4 H 6 NiO 4 ·4H 2 O precursor solution, the total content of metal is 0.025mmol/100mg MOF, the content ratio (molar ratio) of Pt to Ni is 0.3:0.7, stirring for 120min, decanting, and vacuum drying the bottom product at 150 deg.C overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Solution, naBH 4 The solution concentration is 0.6 mol.L -1 And continuously stirring for 60min, centrifugally separating, washing for 3 times by using deionized water, and performing vacuum drying for 6h at 120 ℃ to obtain the target catalyst.
Example 7: preparation of 0.5Pt 0.5 Ni 0.5 MIL-101 (Cr) catalyst
The activated MIL-101 (Cr) carrier was added to 40mL of methylcyclohexane solution and sonicated for 20min. To this suspension H was added with stirring at room temperature 2 PtCl 6 ·6H 2 O and C 4 H 6 NiO 4 ·4H 2 O precursor solution, the total content of metal is 0.0125mmol/100mg MOF, the content ratio (molar ratio) of Pt and Ni is 0.5:0.5, stirring for 120min, decanting, and vacuum drying the bottom product at 150 deg.C overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Solution, naBH 4 The solution concentration is 0.6 mol.L -1 And continuously stirring for 60min, centrifugally separating, washing for 3 times by using deionized water, and performing vacuum drying for 6h at 120 ℃ to obtain the target catalyst.
Example 8: preparation of 0.2Pt 0.5 Ni 0.5 MIL-101 (Cr) -C catalyst
The activated MIL-101 (Cr) carrier is added into 40mL of methylcyclohexane solution and subjected to ultrasonic treatment for 20min. To this suspension H was added with stirring at room temperature 2 PtCl 6 ·6H 2 O and C 4 H 6 NiO 4 ·4H 2 O precursor solution, the total content of metal is 0.005mmol/100mg MOF, the content ratio (molar ratio) of Pt to Ni is 0.5:0.5, stirring for 120min, decanting, and vacuum drying the bottom product at 150 deg.C overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Solution, naBH 4 The solution concentration is 0.6 mol.L -1 And continuously stirring for 60min, centrifugally separating, washing for 3 times by using deionized water, and performing vacuum drying for 6h at 120 ℃ to obtain the target catalyst.
Example 9: CO Oxidation reaction Performance test and stability test
The performance test and the stability test of the CO oxidation reaction are carried out on a fixed bed reaction device, a quartz tube reactor with the inner diameter of 6mm is adopted, and the reaction pressure is normal pressure. The catalysts prepared in examples 2 to 8 were mixed with a small amount of quartz sand and charged into a U-shaped reactor, first in a hydrogen atmosphere at 5 ℃ for min -1 The heating rate is increased from room temperature to 180 ℃ for in-situ pretreatment for 2 hours, and then the temperature is reduced in an argon atmosphere; then switched to 3% CO/8% 2 Reaction gas mixture of/Ar at space velocity of 114000mL g cat -1 ·h -1 The CO oxidation reaction is carried out under the condition. The reaction product was analyzed by gas chromatography equipped with a TCD detector.
The results of the catalyst reaction performance test are shown in fig. 3 and 4. From FIG. 3 (a), it can be seen that the catalytic activity of PtNi bimetallic catalysts with different molar ratios is significantly changed compared with Pt/MIL-101 (Cr) catalyst. Wherein, pt 0.5 Ni 0.5 The complete conversion temperatures of/MIL-101 (Cr) and Pt/MIL-101 (Cr) are close to each other, but the addition of Ni obviously improves the low-temperature catalytic activity of the Pt/MIL-101 (Cr) catalyst, and meanwhile, the cost of the noble metal catalyst can be reduced by reducing the dosage of the noble metal by half. From 3 (b) it can be seen that the Ni/MIL-101 (Cr) catalyst catalyzes oxygen for COThe reaction is essentially inactive. FIG. 4 shows the ratio of Pt to Ni in a molar ratio of 0.5: the CO oxidation reaction performance test chart of the catalyst with different total metal contents at 0.5 shows that the catalytic activity is increased along with the increase of the total metal content, which shows that the more active components of the catalyst under a certain condition, the better the catalytic effect.
Pt prepared in example 3 0.5 Ni 0.5 The CO oxidation stability test result of the/MIL-101 (Cr) catalyst is shown in FIG. 5 at 114000mL g cat -1 ·h -1 No reduction in activity was observed even when the catalyst was maintained at space velocity for 10 hours, indicating that the catalyst has a certain industrial application value.
Example 10:
for Pt/MIL-101 (Cr) prepared in example 2 and Pt prepared in example 3 0.5 Ni 0.5 the/MIL-101 (Cr) catalyst was subjected to in situ infrared CO adsorption testing. Before testing, the catalyst is pretreated in situ at 180 ℃ for 2h in a hydrogen atmosphere, then is cooled to 25 ℃ in an argon atmosphere, CO gas is introduced to adsorb for 30min to saturation after background collection, then the catalyst is switched to Ar atmosphere to purge for 20min for removing CO physically adsorbed, and an infrared spectrogram is collected. The test results are shown in FIG. 6, and it can be seen that the adsorption of CO on Pt sites by adding Ni is red-shifted by 5cm -1 It is shown that electron transfer exists between Pt and Ni, and Ni serves as an electron donor, so that the adsorption of CO is weakened, the CO poisoning phenomenon is avoided, and the catalytic performance is improved.
Claims (10)
1. A catalyst is characterized in that metal platinum and metal nickel are loaded on a metal organic framework material.
2. The catalyst according to claim 1, wherein the total amount of the supported metal platinum and the supported metal nickel is 0.005 to 0.025mmol per 100mg of the metal-organic framework material.
3. The catalyst according to claim 1, characterized in that the metal organic framework material is MIL-101 (Cr).
4. The catalyst according to claim 1, wherein the molar ratio of the metal platinum to the metal nickel is (3-7) to (7-3).
5. The catalyst according to claim 1, characterized in that the molar ratio of metallic platinum to metallic nickel is 3:7 or 1: 3.
6. the catalyst according to any one of claims 1 to 5, characterized in that it is prepared by a two-solvent impregnation method,
adding the activated metal organic framework into a methylcyclohexane solution, uniformly dispersing, and adding H 2 PtCl 6 ·6H 2 O solution and C 4 H 6 NiO 4 ·4H 2 O solution, stirring at room temperature, separating by decantation, adding NaBH after the bottom product is dried 4 Stirring the solution, centrifugally separating, washing and drying.
7. The catalyst of claim 6, wherein the NaBH is 4 The solution concentration is 0.6 mol.L -1 。
8. The catalyst according to claim 6, characterized in that the activated metal organic framework is added to 40mL of methylcyclohexane solution, sonicated for 20min, and H is added at room temperature with stirring 2 PtCl 6 ·6H 2 O and C 4 H 6 NiO 4 ·4H 2 O precursor solution is stirred for 120min, separated by decantation, and the bottom product is dried in vacuum at 150 ℃ overnight; dropwise adding fresh NaBH into the dried product under the conditions of ice bath and stirring 4 Stirring the solution for 60min, centrifuging, washing with deionized water for 3 times, and vacuum drying at 120 deg.C for 6h.
9. Use of a catalyst according to any one of claims 1 to 8 in a carbon monoxide oxidation reaction.
10. Use according to claim 9, characterized in that the catalyst according to any one of claims 1 to 8 is used as a catalyst in carbon monoxide oxidation reactions.
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