CN113083274A - Molybdenum carbide-based catalyst Ni-MOFs-Mo and preparation method and application thereof - Google Patents
Molybdenum carbide-based catalyst Ni-MOFs-Mo and preparation method and application thereof Download PDFInfo
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- CN113083274A CN113083274A CN202110401839.6A CN202110401839A CN113083274A CN 113083274 A CN113083274 A CN 113083274A CN 202110401839 A CN202110401839 A CN 202110401839A CN 113083274 A CN113083274 A CN 113083274A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
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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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/20—Carbon compounds
- B01J27/22—Carbides
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
- B01J37/0036—Grinding
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/086—Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
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- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
- C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
- C07C29/153—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases characterised by the catalyst used
- C07C29/156—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases characterised by the catalyst used containing iron group metals, platinum group metals or compounds thereof
Abstract
The invention belongs to the technical field of chemical catalyst manufacturing engineering, and particularly discloses a molybdenum carbide-based catalyst Ni-MOFs-Mo, and a preparation method and application thereof, wherein a carbon carrier Ni-MOFs is prepared by a hydrothermal method; then dissolving molybdenum salt to proper amount for removingIn the water, after molybdenum salt is completely dissolved, dispersing Ni-MOFs into the molybdenum salt solution, stirring the mixture into a slurry state, putting the slurry into a drying oven at the temperature of 80 ℃ for drying, and obtaining a catalyst precursor after drying; and grinding the prepared precursor, roasting in a tubular furnace, and naturally cooling to room temperature after roasting to obtain the molybdenum carbide-based catalyst Ni-MOFs-Mo. Compared with the prior art, the molybdenum carbide-based catalyst Ni-MOFs-Mo prepared by the invention has excellent CO/H2The method for preparing the low-carbon alcohol from the synthesis gas has the advantages of low activity, selectivity, operation stability, low cost, convenient preparation, good practical application value and easy large-scale production.
Description
Technical Field
The invention relates to the technical field of chemical catalyst manufacturing engineering, in particular to a molybdenum carbide based catalyst Ni-MOFs-Mo and a preparation method and application thereof.
Background
The energy structure of China is 'more coal, lean oil and less gas', the coal reserves account for 70.4%, the natural gas accounts for 3.3% and the petroleum reserves account for 19.7% of the total reserves in the world in the current Chinese energy exploration reserves, and in the Chinese energy exploration reserves, the coal accounts for 94%, the petroleum accounts for 5.4% and the natural gas accounts for 0.6%. The energy structure determines that the energy production and consumption pattern mainly based on coal in China will dominate for a long time. Sulfur dioxide (SO) discharged from coal combustion2) Carbon dioxide (CO)2) Suspended Particles (TSP), Polycyclic Aromatic Hydrocarbons (PAHs) and Nitrogen Oxides (NO)x) Heavy metals and the like are harmful to human health and are the main causes of climate warming, acid rain increase, atmospheric pollution and ozone layer damage. Energy and environmental problems have become important factors that restrict the realization of sustainable development of our economic society. Under the situation that the dual pressure of energy safety and environmental protection is increasingly intensified, the coal liquefaction technology is vigorously developed, and is a strategic choice for promoting clean and efficient utilization and transformation of coal and a strategic choice for enhancing the national energy safety guarantee capability. The synthesis gas is a mixture of CO and H2, CO2The mixed gas of the components is a transition product which is very important in the chemical industry. Almost all organic resources (e.g., biomass, coal, oil and natural gas) can be utilizedEasily converted to syngas by gasification or reforming. After the industrial production of preparing the methanol from the synthesis gas, the development and the application of the technology for preparing the low-carbon alcohol by taking the synthesis gas as the raw material are the breakthrough progress in the field, and the technology for synthesizing the low-carbon mixed alcohol by taking the coal as the raw material is developed from the energy structure analysis, so that the utilization rate of the coal resource is improved, the pollution to the living environment caused by the unreasonable development and the application of the coal resource can be reduced, and the long-term development of China is facilitated.
The lower mixed alcohol is generally C1-C5 mixed alcohol. The application of the fuel is very wide, although the calorific value is slightly lower than that of gasoline and diesel oil, the power performance of the fuel is not very different, carbon deposition is not easily generated due to the fact that oxygen exists in alcohol in the combustion process, pollutants in clean tail gas of an engine are few, and the fuel is environment-friendly. Secondly, it can also be regarded as the fuel additive, the low carbon alcohol has very high octane number, its explosion-proof, shock resistance are superior, mix with gasoline and can replace tetraethyl lead and methyl tert-butyl ether (MTBE) that has been argued that the toxicity is great, for example, through adding 10% ethanol gasoline, the oxygen content of the gasoline can be increased to 3.5%, the octane number can be increased 3 units, can make the part that can not complete fuel in the oil burn fully, thus has raised calorific value and service efficiency of the fuel. In addition, it is also an important chemical raw material, and can be used as a disinfectant, a solvent for chemical production and an analytical reagent. The preparation of ethanol from synthesis gas is a method for preparing synthesis gas (CO and H)2Mixed gas of (2) into a lower alcohol product, which utilizes chemical technology to realize high-efficiency conversion. In a word, the low-carbon alcohol is applied to the gasoline on a large scale, can relieve the shortage of the traditional fossil energy supply, promote the ecological environment protection, reduce the global carbon dioxide emission, meet the agriculture and forestry development requirements, create new employment opportunities, and therefore face huge requirements.
Therefore, it is highly desirable to prepare a catalyst with good performance capable of converting syngas into lower alcohols with high efficiency.
Disclosure of Invention
The invention aims to provide a molybdenum carbide-based catalyst Ni-MOFs-Mo as well as a preparation method and application thereof.
In order to achieve the purpose, the invention is implemented according to the following technical scheme:
the first purpose of the invention is to provide a preparation method of a molybdenum carbide-based catalyst Ni-MOFs-Mo, which comprises the following steps:
step one, preparing carbon carrier Ni-MOFs by a hydrothermal method;
step two, dissolving molybdenum salt into a proper amount of deionized water, dispersing Ni-MOFs into the molybdenum salt solution after the molybdenum salt is completely dissolved, stirring to be in a slurry state, drying in a drying oven at the temperature of 80 ℃, and drying to obtain a catalyst precursor;
and step three, grinding the prepared precursor, putting the ground precursor into a tubular furnace for roasting, and naturally cooling to room temperature after roasting to obtain the molybdenum carbide-based catalyst Ni-MOFs-Mo.
Further, the first step specifically includes:
1 g of Ni (NO)3)2·6H2Adding 1.66 g of terephthalic acid, 60 ml of DMF (dimethyl formamide) and 4 ml of NaOH solution with the concentration of 4M into a hydrothermal reaction kettle, fully stirring and dissolving, putting into a drying box, setting the temperature at 120 ℃, reacting for 24 hours, and naturally cooling to room temperature after reaction; then washing with ethanol and DMF for three times respectively, and drying the centrifugally separated product at 60 ℃ to obtain the carbon carrier Ni-MOFs.
Preferably, in the second step, the molybdenum salt is Mo7O24(NH4)6·4H2O。
Preferably, in the second step, the rotation speed of centrifugal separation is 10000r/min, and the time is 5 min.
Further, the roasting conditions in the tubular furnace in the third step are as follows: setting the heating rate at 10 deg.C/min, heating to 700 deg.C, maintaining for 2H, and naturally cooling to room temperature under the atmosphere of H with molar ratio of 1:12And CO, the flow rate of the atmosphere being 80 ml/min.
The second purpose of the invention is to provide a molybdenum carbide-based catalyst Ni-MOFs-Mo, which is prepared by the preparation method of the molybdenum carbide-based catalyst Ni-MOFs-Mo.
The third purpose of the invention is to provide an application of a molybdenum carbide-based catalyst Ni-MOFs-Mo, wherein the molybdenum carbide-based catalyst Ni-MOFs-Mo is used for catalyzing synthesis gas to prepare low-carbon alcohol, and the process for preparing the low-carbon alcohol comprises the following steps: fully mixing a molybdenum carbide-based catalyst Ni-MOFs-Mo in a weight ratio of 1:3 with 40-60 meshes of silicon dioxide, putting the mixture into a fixed bed reactor, sealing, checking the air tightness, and after checking, keeping the temperature at 300-400 ℃, the pressure at 5-7 MPa and the airspeed at 5000h-1Activating for 4 hours; and introducing synthesis gas to start reaction after activation, wherein the molar ratio of the synthesis gas is 1: 1H2And CO under the reaction conditions: the temperature is 300--1。
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts Ni-MOFs as the carbon carrier to prepare the molybdenum carbide-based catalyst Ni-MOFs-Mo for the first time, and the material is novel, convenient, high-efficiency and easy for large-scale production.
(2) The catalyst provided by the invention has the characteristics of high activity, high total alcohol and C2+ alcohol selectivity, sintering resistance, carbon deposition resistance and the like in the application of preparing low-carbon alcohol from synthesis gas.
Drawings
FIG. 1 is a scanning electron micrograph of a catalyst precursor in example 1.
FIG. 2 is a scanning electron micrograph of the catalyst of example 1 before reaction.
FIG. 3 is an X-ray diffraction pattern of the catalyst of example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
1 g of Ni (NO)3)2·6H2O, 1.66 g of terephthalic acid, 60 ml of DMF and 4 ml of 4M NaOH solution are added into a hydrothermal reaction kettle and fully stirredAfter stirring and dissolving, putting the mixture into a drying oven, setting the temperature at 120 ℃, reacting for 24 hours, and naturally cooling the mixture to room temperature after the reaction; washing with ethanol and DMF for three times, and drying the product after centrifugal separation (rotation speed of 10000r/min and time of 5 min) at 60 deg.C to obtain carbon carrier Ni-MOFs;
then 1.665g of ammonium molybdate Mo is taken7O24(NH4)6·4H2Dissolving O in deionized water until ammonium molybdate Mo7O24(NH4)6·4H2After complete dissolution of O, 3g of carbon support Ni-MOFs was dispersed to the above ammonium molybdate Mo7O24(NH4)6·4H2And stirring the solution O to be in a slurry state, drying the solution O in a drying box at the temperature of 80 ℃, and drying to obtain the catalyst precursor. The scanning electron micrograph of the catalyst precursor is shown in fig. 1.
Grinding the prepared catalyst precursor, putting the ground catalyst precursor into a tube furnace, setting the heating rate to be 10 ℃/min, heating to 700 ℃, keeping the temperature for 2H, and keeping the atmosphere to be H with the molar ratio of 1:12And CO, the flow rate of the atmosphere being 80 ml/min; naturally cooling to room temperature to obtain the molybdenum carbide based catalyst Ni-MOFs-Mo. The scanning electron micrograph of the molybdenum carbide-based catalyst Ni-MOFs-Mo is shown in figure 2. The X-ray diffraction pattern of the molybdenum carbide-based catalyst Ni-MOFs-Mo is shown in figure 3.
2g of a molybdenum carbide-based catalyst Ni-MOFs-Mo, 6 g of Silica (SiO)240-60 meshes), placing the mixture into a fixed bed reactor, sealing, checking the air tightness, and after checking, controlling the temperature to be 380 ℃, the pressure to be 7 MPa and the space velocity to be 5000h-1Activating for 4 h. Starting the reaction after activation, and the reaction conditions are as follows: the temperature is 300 ℃, the pressure is 7.0 MPa, and the space velocity is 3000 h-1Synthesis gas H2and/CO = 1. The gaseous product was analyzed using an on-line gas chromatograph, and the liquid product was collected in a sample bottle and analyzed using an off-line gas chromatograph.
The performance evaluation of the catalyst shows that under the reaction condition, the CO conversion rate is 5.33%, the total alcohol selectivity is 55.52%, and C is2+The alcohol selectivity was 66.91%, and the total alcohol space-time yield was 54 mg/g/h. At the same time, toCompared with the catalyst after reaction, no obvious coking is found, and the catalyst shows excellent catalytic stability. The data comprehensively embody Mo2The C-based catalyst shows excellent catalytic performance in the field of preparing low-carbon alcohol from synthesis gas.
Example 2
The catalytic reaction temperature in example 1 was adjusted to 320 ℃ under the same conditions as in example 1. The results of the catalytic activity evaluation were: CO conversion 9.53%, total alcohol selectivity 51.02%, C2+The alcohol selectivity was 67.44% and the total alcohol space time yield was 102 mg/g/h.
Example 3
The catalytic reaction temperature of example 1 was adjusted to 340 ℃ under the same conditions as in example 1. The results of the catalytic activity evaluation were: CO conversion 16.80%, total alcohol selectivity 41.95%, C2+The alcohol selectivity was 69.07%, and the total alcohol space-time yield was 134 mg/g/h.
Example 4
The catalytic reaction temperature in example 1 was adjusted to 360 ℃ under the same conditions as in example 1. The results of the catalytic activity evaluation were: CO conversion 30.87%, Total alcohol Selectivity 30.87%, C2+The alcohol selectivity was 72.08% and the total alcohol space-time yield was 194 mg/g/h.
Example 5
The catalytic reaction temperature in example 1 was adjusted to 400 ℃ under the same conditions as in example 1. The results of the catalytic activity evaluation were: CO conversion 59.37%, total alcohol selectivity 12.71%, C2+The alcohol selectivity was 68.53%, and the total alcohol space-time yield was 120 mg/g/h.
Example 6
The catalytic reaction air speed of the example 4 is adjusted to 5000h-1The other conditions were the same as in example 4. The results of the catalytic activity evaluation were: CO conversion 29.83%, total alcohol selectivity 29.50%, C2+The alcohol selectivity was 71.34% and the total alcohol space-time yield was 225 mg/g/h.
Example 7
The catalytic reaction air speed of example 4 was adjusted to 7000 h-1The other conditions were the same as in example 4. The results of the catalytic activity evaluation were: CO conversion 21.72%, total alcohol selectivity 35.20%, C2+Alcohol selectivity 70.80%, total alcohol space time yieldThe rate was 284 mg/g/h.
Example 8
The catalytic reaction pressure in example 6 was adjusted to 6 MPa, and the other conditions were the same as in example 6. The results of the catalytic activity evaluation were: CO conversion 28.53%, total alcohol selectivity 24.95%, C2+The alcohol selectivity was 72.18%, and the total alcohol space-time yield was 166 mg/g/h.
Example 9
The catalytic reaction pressure in example 6 was adjusted to 5 MPa, and the other conditions were the same as in example 6. The results of the catalytic activity evaluation were: CO conversion 25.53%, Total alcohol selectivity 22.14%, C2+The alcohol selectivity was 72.49% and the total alcohol space-time yield was 130 mg/g/h.
In the application of preparing low-carbon alcohol from synthesis gas, the catalyst disclosed by the invention has the characteristics of high activity, high total alcohol and C2+ alcohol selectivity, sintering resistance, carbon deposition resistance and the like.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (8)
1. A preparation method of a molybdenum carbide-based catalyst Ni-MOFs-Mo is characterized by comprising the following steps:
step one, preparing carbon carrier Ni-MOFs by a hydrothermal method;
step two, dissolving molybdenum salt into a proper amount of deionized water, dispersing Ni-MOFs into the molybdenum salt solution after the molybdenum salt is completely dissolved, stirring to be in a slurry state, drying in a drying oven at the temperature of 80 ℃, and drying to obtain a catalyst precursor;
and step three, grinding the prepared precursor, putting the ground precursor into a tubular furnace for roasting, and naturally cooling to room temperature after roasting to obtain the molybdenum carbide-based catalyst Ni-MOFs-Mo.
2. The method for preparing the molybdenum carbide-based catalyst Ni-MOFs-Mo according to claim 1, wherein the first step specifically comprises:
1 g of Ni (NO)3)2·6H2O, 1.66 g of terephthalic acid,adding 60 ml of DMF (dimethyl formamide) and 4 ml of NaOH solution with the concentration of 4M into a hydrothermal reaction kettle, fully stirring and dissolving, putting into a drying box, setting the temperature at 120 ℃, reacting for 24 hours, and naturally cooling to room temperature after reaction; then washing with ethanol and DMF for three times respectively, and drying the centrifugally separated product at 60 ℃ to obtain the carbon carrier Ni-MOFs.
3. The method for preparing the molybdenum carbide-based catalyst Ni-MOFs-Mo according to claim 1, wherein: in the second step, the molybdenum salt is Mo7O24(NH4)6·4H2O。
4. The method for preparing the molybdenum carbide-based catalyst Ni-MOFs-Mo according to claim 1, wherein in the second step, the rotation speed of centrifugal separation is 10000r/min, and the time is 5 min.
5. The method for preparing the molybdenum carbide-based catalyst Ni-MOFs-Mo according to claim 1, wherein the conditions for the calcination in the tube furnace in the third step are as follows: setting the heating rate at 10 deg.C/min, heating to 700 deg.C, maintaining for 2H, and naturally cooling to room temperature under the atmosphere of H with molar ratio of 1:12And CO, the flow rate of the atmosphere being 80 ml/min.
6. A molybdenum carbide-based catalyst Ni-MOFs-Mo is characterized in that: prepared by the method for preparing the molybdenum carbide-based catalyst Ni-MOFs-Mo according to any one of claims 1 to 5.
7. Use of the molybdenum carbide-based catalyst Ni-MOFs-Mo according to claim 6 for catalyzing syngas to make lower alcohols.
8. The use of the molybdenum carbide-based catalyst Ni-MOFs-Mo according to claim 7, characterized in that it comprises the following steps: fully mixing a molybdenum carbide-based catalyst Ni-MOFs-Mo with 40-60 meshes of silicon dioxide in a weight ratio of 1:3,placing into a fixed bed reactor, sealing, checking gas tightness, checking, at the temperature of 300-400 deg.C, the pressure of 5-7 MPa, and the airspeed of 5000h-1Activating for 4 hours; and introducing synthesis gas to start reaction after activation, wherein the molar ratio of the synthesis gas is 1: 1H2And CO under the reaction conditions: the temperature is 300--1。
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| CN108212167A (en) * | 2017-12-31 | 2018-06-29 | 中海油天津化工研究设计院有限公司 | It is a kind of for catalyst of low carbon alcohol by synthetic gas and its preparation method and application |
| CN110075888A (en) * | 2019-04-26 | 2019-08-02 | 中南民族大学 | The preparation method of a kind of MoC@C catalyst and its in CO2Application in synthesizing methanol by hydrogenating reaction |
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