CN112916022A - Selective hydrogenation catalyst, preparation method and application thereof - Google Patents

Selective hydrogenation catalyst, preparation method and application thereof Download PDF

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Publication number
CN112916022A
CN112916022A CN202110079249.6A CN202110079249A CN112916022A CN 112916022 A CN112916022 A CN 112916022A CN 202110079249 A CN202110079249 A CN 202110079249A CN 112916022 A CN112916022 A CN 112916022A
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catalyst
carrier
solution
selective hydrogenation
hydrogenation catalyst
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宋元江
李文龙
李扬
刘亚华
王雪峰
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Southwest Research and Desigin Institute of Chemical Industry
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    • B01J23/8933—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/894—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
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    • C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
    • C07C67/303—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by hydrogenation of unsaturated carbon-to-carbon bonds
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Abstract

The invention provides a selective hydrogenation catalyst, and belongs to the technical field of catalytic hydrogenation catalysts. The selective hydrogenation catalyst comprises a carrier accounting for 97.5-99.7% of the total mass of the catalyst, a main catalyst accounting for 0.1-1.0% of the total mass of the catalyst and a cocatalyst accounting for 0.2-1.5% of the total mass of the catalyst, wherein the carrier is gamma-Al2O3One or two of active carbon, titanium dioxide and silicon dioxide; the main catalyst is one or more of Rh, Pt, Pd and Ru; the cocatalyst isCe. One or more of Cu, La, Ni, Fe, Zr, Co and Mn. The invention also provides a preparation method and application of the selective hydrogenation catalyst. The selective hydrogenation catalyst has low content of the main catalyst and the cocatalyst, and low cost and price; the reaction condition is mild, the catalytic activity and stability are high, and the selectivity of a target product is good; the preparation method is simple, raw materials are easy to obtain, and the catalyst is convenient and quick to reduce and fill, and can be applied to the reaction of hydrogenation-C-C-bond generation-C-C-bond.

Description

Selective hydrogenation catalyst, preparation method and application thereof
Technical Field
The invention belongs to the technical field of hydrogenation catalysts, and particularly relates to a selective hydrogenation catalyst, and a preparation method and application thereof.
Background
The selective hydrogenation reaction is an important process in the field of chemical industry and plays an irreplaceable role in the production of various important chemicals, and the technical core of the selective hydrogenation reaction is the selection of the type of a selective hydrogenation catalyst and the preparation of the catalyst. How to develop a catalyst with high activity, high selectivity and good stability is always favored by catalyst researchers, and the application of the selective hydrogenation catalyst is very wide.
The selective hydrogenation catalyst is mainly divided into non-noble metal and noble metal. The non-noble metal of the former is the most common Ni-based catalyst, but the preparation method is complicated, the technological parameters of the preparation process are difficult to control, the activity uniformity of the catalyst is poor, the hydrogenation selectivity is poor, the loading capacity of a single catalyst is large, the catalyst is troublesome to replace, the waste catalyst is difficult to treat and the like. The latter noble metal mainly takes Pt and Pd as the main catalysts, and because the noble metal has strong dissociative hydrogen absorption capacity, under mild reaction conditions, the noble metal catalyst has the advantages of good hydrogenation activity, long service life, small catalyst consumption, quick and convenient catalyst replacement and the like, and the selective hydrogenation catalyst with high selectivity, good activity and good stability can be prepared by properly adjusting the catalyst components.
Disclosure of Invention
The invention aims to provide a selective hydrogenation catalyst which has good catalytic activity, high stability, good selectivity to target products and long service life under mild reaction conditions, and a preparation method and application thereof. The catalyst can be used for preparing Methyl Propionate (MP) by selective hydrogenation of Methyl Acrylate (MA) or for the reaction of hydrogenation-C-C-bond to generate-C-C-bond.
The purpose of the invention is realized by the following technical scheme:
a selective hydrogenation catalyst comprises a carrier, a main catalyst and a cocatalyst, wherein the carrier accounts for 97.5-99.7% of the total mass of the catalyst; the main catalyst accounts for 0.1-1.0% of the total mass of the catalyst; the cocatalyst accounts for 0.2-1.5% of the total mass of the catalyst.
Further, the carrier is gamma-Al2O3One or two of active carbon, titanium dioxide and silicon dioxide; the main catalyst is one or more of Rh, Pt, Pd and Ru; the catalyst promoter is one or more of Ce, Cu, La, Ni, Fe, Zr, Co and Mn.
Further, the mass fraction of each component of the carrier is gamma-Al based on the total mass of the catalyst2O3: 0-99.7%, activated carbon: 0-99.7%, titanium dioxide: 0-99.7%, silica: 0 to 99.7 percent; the mass fraction of each component of the main catalyst is Rh: 0-0.6%, Pt: 0-0.6%, Pd: 0-0.8%, Ru: 0 to 0.8 percent; the mass fraction of each component of the cocatalyst is Ce: 0-0.5%, Cu: 0-1.0%, La: 0-0.5%, Ni: 0-1.0%, Fe: 0-0.8%, Zr: 0-0.5%, Co: 0-0.8%, Mn: 0 to 0.5 percent.
A preparation method of a selective hydrogenation catalyst comprises the following steps:
1) taking part of the carrier, adding the part of the carrier into deionized water until the carrier is just adsorbed and saturated, and recording the weight of the consumed deionized water to obtain the water absorption capacity of the carrier per unit mass, namely the saturated water absorption X of the carrier;
2) preparing a main catalyst metal salt solution into a solution with the total metal ion concentration of 15-40 g/L, heating in a water bath, and stirring, wherein the solution is marked as a solution A;
3) preparing a water-soluble salt of a promoter metal into a solution with the total metal ion concentration of 10-45 g/L, heating in a water bath, and stirring, wherein the solution is marked as a solution B;
4) uniformly mixing the solution A and the solution B, diluting, naturally cooling for later use, and marking as an impregnation liquid C, wherein the weight of the impregnation liquid C is equal to the weight of the carrier for impregnation multiplied by the saturated water absorption X of the carrier;
5) weighing a carrier with a certain weight, dropwise adding the impregnation liquid C onto the carrier, continuously stirring for 40-60 min, and standing and aging for 2-4 h; drying and roasting to obtain the selective hydrogenation catalyst.
Further, in the step 2), the water bath heating temperature is 20-50 ℃, and the time is 30-50 min.
Further, in the step 3), the water bath heating temperature is 20-60 ℃, and the time is 30-90 min.
Further, in the step 4), the natural cooling temperature is 10-30 ℃, and the time is 0.5-3 h.
Further, in the step 5), the drying temperature is 60-150 ℃, and the drying time is 2-8 hours; the roasting temperature is 300-550 ℃, and the roasting time is 3-6 h.
The application of a selective hydrogenation catalyst is applied to the reaction of preparing methyl propionate by hydrogenating methyl acrylate or generating-C-C-bond by hydrogenating-C-C-bond.
Compared with the prior art, the invention has the following beneficial effects:
1. the selective hydrogenation catalyst has low content of the main catalyst and the cocatalyst, low cost and price and good economic benefit to enterprises.
2. Under mild reaction conditions, the selective hydrogenation catalyst has high catalytic activity and stability for selectively hydrogenating Methyl Acrylate (MA) to generate Methyl Propionate (MP) and good selectivity for a target product MP, and effectively solves the problem that the raw material MA is easy to polymerize to block a reactor and a pipeline in the reaction process.
3. The selective hydrogenation catalyst has the advantages of simple preparation method, easily obtained raw materials, convenient catalyst filling and reduction, high catalytic activity and long service life, and can be applied to the reaction of hydrogenation-C-bond generation-C-C-bond.
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. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The components and their contents (based on the total mass of the catalyst) of the selective hydrogenation catalyst of this example are shown in the following table:
composition (I) Rh Ce Cu Ni Zr Mn Carrier
Content% 0.40 0.05 0.10 0.10 0.05 0.10 99.20
The preparation method of the selective hydrogenation catalyst of the embodiment specifically comprises the following steps:
1) weighing gamma-Al2O310.0g of the carrier was placed in a beaker,under the condition of stirring, dripping deionized water until the carrier in the beaker is just adsorbed and saturated, and recording that the weight of the consumed deionized water is 5.50g, namely the saturated water absorption X of the carrier is 0.55;
2) 1.132g of Rh (NO) were taken3)3Dissolving the solution in 3.0g of deionized water, heating to 30 ℃ in a water bath, stirring for 30min, and marking as solution A;
3) 0.031g of Ce (NO) is taken3)3·6H2O、0.077g Cu(NO3)2·3H2O、0.100g Ni(NO3)2·6H2O、0.047g Zr(NO3)4·5H2O、0.131g Mn(NO3)2Dissolving the solution in 3.0g deionized water, heating to 45 deg.C in water bath, stirring for 50min, and labeling as solution B;
4) uniformly mixing the solution A and the solution B, adding 3.74g of deionized water for dilution, and naturally cooling for 0.5h, wherein the solution temperature is 20 ℃, and the label is solution C;
5) weighing gamma-Al2O3And (3) placing 20.0g of a carrier in a beaker, dropwise adding the solution C onto the carrier, continuously stirring for 50min, standing and aging for 3h, transferring to a drying oven at 130 ℃ for drying for 5h, and roasting in a muffle furnace at 450 ℃ for 5h to obtain the selective hydrogenation catalyst, wherein the serial number of the selective hydrogenation catalyst is Cat.1.
Example 2
The components and their contents (based on the total mass of the catalyst) of the selective hydrogenation catalyst of this example are shown in the following table:
composition (I) Pt Pd Ce Ni Zr Co Carrier
Content% 0.10 0.20 0.10 0.10 0.10 0.05 99.35
The preparation method of the selective hydrogenation catalyst of the embodiment specifically comprises the following steps:
1) weighing gamma-Al2O3Placing 10.0g of mixed carrier with titanium dioxide in a beaker, dripping deionized water until the carrier in the beaker is just adsorbed and saturated under the stirring condition, and recording that the weight of the consumed deionized water is 4.80g, namely the saturated water absorption X of the carrier is 0.48;
2) 0.165g of Pt (NO) was taken3)2Solution, 0.436g Pd (NO)3)2Dissolving the solution in 2.0g of deionized water, heating to 30 ℃ in a water bath, stirring for 30min, and marking as solution A;
3) taking 0.062g Ce (NO)3)3·6H2O、0.100g Ni(NO3)2·6H2O、0.095g Zr(NO3)4·5H2O、0.050g Co(NO3)2·6H2Dissolving O in 4.0g of deionized water, heating to 45 ℃ in a water bath, stirring for 50min, and marking as a solution B;
4) uniformly mixing the solution A and the solution B, adding 3.0g of deionized water for dilution, and naturally cooling for 0.5h, wherein the solution temperature is 20 ℃, and the label is solution C;
5) weighing gamma-Al2O3And (3) placing 20.0g of mixed carrier with titanium dioxide in a beaker, dropwise adding the solution C on the carrier, continuously stirring for 50min, standing and aging for 3h, transferring to a drying oven at 130 ℃ for drying for 5h, and roasting in a muffle furnace at 400 ℃ for 5h to obtain the selective hydrogenation catalyst, which is numbered Cat.2.
Example 3
The components and their contents (based on the total mass of the catalyst) of the selective hydrogenation catalyst of this example are shown in the following table:
composition (I) Pt Ru Cu La Fe Mn Carrier
Content% 0.30 0.10 0.20 0.10 0.10 0.10 99.10
The preparation method of the selective hydrogenation catalyst of the embodiment specifically comprises the following steps:
1) weighing 10.0g of activated carbon carrier, placing the activated carbon carrier in a beaker, dripping deionized water until the carrier in the beaker is just adsorbed and saturated under the stirring condition, and recording the weight of the consumed deionized water as 5.0g, namely the saturated water absorption X of the carrier as 0.50;
2) 0.495g of Pt (NO) was taken3)2Solution, 0.316g Ru (NO)3)3Dissolving the solution in 3.0g of deionized water, heating to 30 ℃ in a water bath, stirring for 30min, and marking as solution A;
3) 0.154g of Cu (NO) was taken3)2·3H2O、0.063g La(NO3)3·6H2O、0.146g Fe(NO3)3·9H2O、0.050g Mn(NO3)2Dissolving the solution in 4.0g of deionized water, heating to 45 ℃ in a water bath, stirring for 50min, and marking as a solution B;
4) uniformly mixing the solution A and the solution B, adding 2.19g of deionized water for dilution, and naturally cooling for 0.5h, wherein the solution temperature is 20 ℃, and the label is solution C;
5) and weighing 20.0g of the activated carbon carrier, placing the activated carbon carrier in a beaker, dropwise adding the solution C onto the carrier, continuously stirring for 50min, standing and aging for 3h, transferring the mixture into a drying oven at 130 ℃ for drying for 5h, and roasting in a muffle furnace at 400 ℃ for 5h to obtain the selective hydrogenation catalyst, wherein the serial number of the selective hydrogenation catalyst is Cat.3.
Example 4
The components and their contents (based on the total mass of the catalyst) of the selective hydrogenation catalyst of this example are shown in the following table:
composition (I) Rh Ru Ce Ni Fe Co Carrier
Content% 0.25 0.20 0.20 0.20 0.10 0.10 98.95
The preparation method of the selective hydrogenation catalyst of the embodiment specifically comprises the following steps:
1) weighing gamma-Al2O3Putting 10.0g of mixed carrier with the activated carbon into a beaker, dripping deionized water until the carrier in the beaker is just adsorbed and saturated under the stirring condition, and recording that the weight of the consumed deionized water is 5.35g, namely the saturated water absorption X of the carrier is 0.535;
2) 0.709g of Rh (NO) was taken3)3Solution, 0.634g Ru (NO)3)3Dissolving the solution in 3.0g of deionized water, heating to 30 ℃ in a water bath, stirring for 30min, and marking as solution A;
3) 0.125g of Ce (NO) is taken3)3·6H2O、0.200g Ni(NO3)2·6H2O、0.146g Fe(NO3)3·9H2O、0.100g Co(NO3)2·6H2Dissolving O in 4.0g of deionized water, heating to 45 ℃ in a water bath, stirring for 50min, and marking as a solution B;
4) uniformly mixing the solution A and the solution B, adding 2.36g of deionized water for dilution, and naturally cooling for 1h, wherein the solution temperature is 20 ℃, and the label is solution C;
5) weighing gamma-Al2O3And (3) placing 20.0g of mixed carrier with the activated carbon in a beaker, dropwise adding the solution C on the carrier, continuously stirring for 50min, standing and aging for 3h, transferring to an oven at 85 ℃ for drying for 6h, and roasting for 5h in a muffle furnace at 350 ℃ under the nitrogen atmosphere to obtain the selective hydrogenation catalyst, which is numbered Cat.4.
Example 5
The components and their contents (based on the total mass of the catalyst) of the selective hydrogenation catalyst of this example are shown in the following table:
composition (I) Rh Pt Pd Cu La Ni Zr Carrier
Content% 0.10 0.10 0.20 0.20 0.10 0.05 0.10 99.15
The preparation method of the selective hydrogenation catalyst of the embodiment specifically comprises the following steps:
1) weighing gamma-Al2O3Putting 10.0g of carrier into a beaker, dripping deionized water under the stirring condition until the carrier in the beaker is just adsorbed and saturated, and recording the weight of the consumed deionized water as 5.50g, namely the saturated water absorption X of the carrier as 0.55;
2) 0.283g of Rh (NO) is taken3)3Solution, 0.165g Pt (NO)3)2Solution, 0.437g Pd (NO)3)2Dissolving the solution in 4.0g of deionized water, heating to 30 ℃ in a water bath, stirring for 30min, and marking as solution A;
3) 0.153g of Cu (NO)3)2·3H2O、0.063g La(NO3)3·6H2O、0.050g Ni(NO3)2·6H2O、0.095g Zr(NO3)4·5H2Dissolving O in 4.0g of deionized water, heating to 45 ℃ in a water bath, stirring for 50min, and marking as a solution B;
4) uniformly mixing the solution A and the solution B, adding 2.12g of deionized water for dilution, and naturally cooling for 1h, wherein the solution temperature is 20 ℃, and the label is solution C;
5) weighing gamma-Al2O3Placing 20.0g of carrier in a beaker, adding solution C dropwise onto the carrier, stirring for 50min, standing and aging for 3 hr, transferring to a 130 deg.C oven, drying for 5 hr, and heating to 450 deg.CAnd roasting for 5 hours in a muffle furnace to obtain the selective hydrogenation catalyst with the serial number of Cat.5.
Example 6
The components and their contents (based on the total mass of the catalyst) of the selective hydrogenation catalyst of this example are shown in the following table:
composition (I) Rh Pd Ce La Co Mn Carrier
Content% 0.20 0.30 0.10 0.10 0.10 0.05 99.15
The preparation method of the selective hydrogenation catalyst of the embodiment specifically comprises the following steps:
1) weighingγ-Al2O3Placing 10.0g of mixed carrier with silicon dioxide in a beaker, dripping deionized water until the carrier in the beaker is just adsorbed and saturated under the stirring condition, and recording that the weight of the consumed deionized water is 5.10g, namely the saturated water absorption X of the carrier is 0.51;
2) 0.566g of Rh (NO) was taken3)3Solution, 0.655g Pd (NO)3)2Dissolving the solution in 3.0g of deionized water, heating to 30 ℃ in a water bath, stirring for 30min, and marking as solution A;
3) 0.063g of Ce (NO) is taken3)3·6H2O、0.063g La(NO3)3·6H2O、0.100g Co(NO3)2·6H2O、0.066g Mn(NO3)2Dissolving the solution in 3.0g deionized water, heating to 45 deg.C in water bath, stirring for 50min, and labeling as solution B;
4) uniformly mixing the solution A and the solution B, adding 2.91g of deionized water for dilution, and naturally cooling for 1h, wherein the solution temperature is 20 ℃, and the label is solution C;
5) weighing gamma-Al2O3And (3) placing 20.0g of mixed carrier with silicon dioxide in a beaker, dropwise adding the solution C on the carrier, continuously stirring for 50min, standing and aging for 3h, transferring to a 130 ℃ oven for drying for 5h, and roasting in a 450 ℃ muffle furnace for 5h to obtain the selective hydrogenation catalyst, which is numbered Cat.6.
Example 7
The components and their contents (based on the total mass of the catalyst) of the selective hydrogenation catalyst of this example are shown in the following table:
composition (I) Pd Ce La Mn Carrier
Content% 0.30 0.10 0.10 0.05 99.45
The preparation method of the selective hydrogenation catalyst of the embodiment specifically comprises the following steps:
1) weighing 10.0g of silicon dioxide carrier, placing the silicon dioxide carrier in a beaker, dripping deionized water until the carrier in the beaker adsorbs excessive water under the stirring condition, and recording the weight of the consumed deionized water as 5.50g, namely the water absorption X of the carrier as 0.55;
2) 0.653g of Pd (NO)3)2Dissolving the solution in 3.0g of deionized water, heating to 30 ℃ in a water bath, stirring for 30min, and marking as solution A;
3) 0.063g of Ce (NO) is taken3)3·6H2O、0.063g La(NO3)3·6H2O、0.066g Mn(NO3)2Dissolving the solution in 3.0g deionized water, heating to 45 deg.C in water bath, stirring for 50min, and labeling as solution B;
4) uniformly mixing the solution A and the solution B, adding 4.28g of deionized water for dilution, and naturally cooling for 1h, wherein the solution temperature is 20 ℃, and the label is solution C;
5) weighing 20.0g of silicon dioxide carrier, placing the silicon dioxide carrier in a beaker, dropwise adding the solution C on the carrier, continuously stirring for 50min, standing and aging for 3h, transferring to a drying oven at 130 ℃ for drying for 5h, and then roasting in a muffle furnace at 450 ℃ for 5h to obtain the selective hydrogenation catalyst, wherein the number of the selective hydrogenation catalyst is Cat.7.
Examples Selective hydrogenation catalyst Activity and stability testing
Activity and stability test conditions:
the reaction temperature is 80 ℃, the reaction pressure is 1.0Mp, and the gas space velocity is 2000h-1、H2The reaction product, Methyl Propionate (MP), was measured by liquid and gas chromatography at a ratio of 20:1 with the amount of Methyl Acrylate (MA) species.
The activity and stability test results of the catalysts prepared in examples 1 to 7 are shown in tables 1 and 2 below, respectively.
Table 1 examples 1 to 7 catalyst activity test results
Figure BDA0002908617940000091
Figure BDA0002908617940000101
Table 2 examples 1 to 7 catalyst stability test results
Figure BDA0002908617940000102
Figure BDA0002908617940000111
As shown in table 1 and table 2 above: under the mild hydrogenation reaction condition, the selective hydrogenation catalyst has high catalytic activity on the MP prepared by the MA selective hydrogenation, when the reaction temperature is 80 ℃ and the pressure is 1.0Mp, the raw material MA can be completely converted, and the selectivity of the product MP is more than 99.6 percent; after 1600 hours of reaction, the conversion rate of the raw material MA of the selective hydrogenation catalyst is still kept above 90.3%, and the catalyst has good stability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The selective hydrogenation catalyst is characterized by comprising a carrier, a main catalyst and a cocatalyst, wherein the carrier accounts for 97.5-99.7% of the total mass of the catalyst; the main catalyst accounts for 0.1-1.0% of the total mass of the catalyst; the cocatalyst accounts for 0.2-1.5% of the total mass of the catalyst.
2. The selective hydrogenation catalyst of claim 1, wherein the support is γ -Al2O3One or two of active carbon, titanium dioxide and silicon dioxide; the main catalyst is one or more of Rh, Pt, Pd and Ru; the catalyst promoter is one or more of Ce, Cu, La, Ni, Fe, Zr, Co and Mn.
3. The selective hydrogenation catalyst of claim 1, wherein the support comprises γ -Al in the mass fraction based on the total mass of the catalyst2O3: 0-99.7%, activated carbon: 0-99.7%, titanium dioxide: 0-99.7%, silica: 0 to 99.7 percent; the mass fraction of each component of the main catalyst is Rh: 0-0.6%, Pt: 0-0.6%, Pd: 0-0.8%, Ru: 0 to 0.8 percent; the mass fraction of each component of the cocatalyst is Ce: 0-0.5%, Cu: 0-1.0%, La: 0-0.5%, Ni: 0-1.0%, Fe: 0-0.8%, Zr: 0-0.5%, Co: 0-0.8%, Mn: 0 to 0.5 percent.
4. A process for the preparation of a selective hydrogenation catalyst as claimed in any one of claims 1 to 3, characterized in that it comprises the following steps:
1) taking part of the carrier, adding the part of the carrier into deionized water until the carrier is just adsorbed and saturated, and recording the weight of the consumed deionized water to obtain the water absorption capacity of the carrier per unit mass, namely the saturated water absorption X of the carrier;
2) preparing a main catalyst metal salt solution into a solution with the total metal ion concentration of 15-40 g/L, heating in a water bath, and stirring, wherein the solution is marked as a solution A;
3) preparing a water-soluble salt of a promoter metal into a solution with the total metal ion concentration of 10-45 g/L, heating in a water bath, and stirring, wherein the solution is marked as a solution B;
4) uniformly mixing the solution A and the solution B, diluting, naturally cooling for later use, and marking as an impregnation liquid C, wherein the weight of the impregnation liquid C is equal to the weight of the carrier for impregnation multiplied by the saturated water absorption X of the carrier;
5) weighing a carrier with a certain weight, dropwise adding the impregnation liquid C onto the carrier, continuously stirring for 40-60 min, standing and aging for 2-4 h, drying, and roasting to obtain the selective hydrogenation catalyst.
5. The method for preparing the selective hydrogenation catalyst according to claim 4, wherein in the step 2), the water bath heating temperature is 20-50 ℃ and the time is 30-50 min.
6. The method for preparing the selective hydrogenation catalyst according to claim 4, wherein in the step 3), the water bath heating temperature is 20-60 ℃ and the time is 30-90 min.
7. The method for preparing the selective hydrogenation catalyst according to claim 4, wherein in the step 4), the natural cooling temperature is 10-30 ℃ and the natural cooling time is 0.5-3 h.
8. The method for preparing the selective hydrogenation catalyst according to claim 4, wherein in the step 5), the drying temperature is 60-150 ℃ and the drying time is 2-8 h; the roasting temperature is 300-550 ℃, and the roasting time is 3-6 h.
9. Use of a selective hydrogenation catalyst as claimed in any one of claims 1 to 3 wherein the catalyst is used in the hydrogenation of methyl acrylate to produce methyl propionate or in reactions containing the hydrogenation of-C-bonds to form-C-C-bonds.
CN202110079249.6A 2021-01-21 2021-01-21 Selective hydrogenation catalyst, preparation method and application thereof Pending CN112916022A (en)

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