Metal modified Cu / MgO catalyst, preparation method thereof and application of metal modified Cu / MgO catalyst in preparation of pentanediol from furfural

Abstract

The invention discloses a metal modified Cu / MgO catalyst, a preparation method thereof and application of the metal modified Cu / MgO catalyst in preparation of pentanediol from furfural, and belongs to the technical field of catalysts. The metal modified Cu / MgO catalyst is composed of Cu, MgO and M, Cu serves as a metal active center to play a main catalytic role and is applied to furfural hydrogenation, MgO and M serve as carriers together, on one hand, Cu is loaded, and on the other hand, reaction substrates are loaded and alkaline sites are provided; a metal carrier M is added on the basis of a Cu / MgO catalyst, the alkaline site of the carrier can be further improved through the metal carrier M, in the preparation process of the catalyst, the metal carrier M can be partially reduced, oxygen vacancies are formed on the surface, adsorption of a substrate on the catalyst is facilitated, and then the selectivity of the catalyst is improved; the catalyst has good hydrogenolysis activity and selectivity on furfural under mild conditions, and does not produce obvious polymers.

Description

Technical Field

[0001] The invention belongs to the technical field of catalysts, and in particular relates to a metal-modified Cu / MgO catalyst, a preparation method thereof, and application thereof in preparing pentanediol from furfural. Background Art

[0002] Biomass is a renewable carbon resource with the advantages of low price, abundant resources and short renewable cycle. It is often used as a reliable source to replace fossil resources to produce fuels and chemicals, and can be converted into high value-added compounds, chemical platform molecules, etc. Among them, furfural, as an important organic chemical raw material obtained by hydrolysis of biomass, is the most important derivative of the furan ring system. At present, furfural is produced by acidic hydrolysis of hemicellulose in agricultural and forestry wastes, with an annual global output of more than 650,000 tons. Furfural has active chemical properties and can be converted into a variety of chemicals. It is widely used in industries such as medicine and pesticides. Furfural hydrogenation can produce important industrial products such as furfuryl alcohol, 2-methylfuran, 2-methyltetrahydrofuran, tetrahydrofurfuryl alcohol, 1,5-pentanediol, 1,2-pentanediol, etc. Among them, pentanediol is an important chemical raw material.

[0003] 1,2-Pentanediol is an important organic raw material. 80% of the world's 1,2-pentanediol is used in the synthesis of the fungicide propiconazole. At the same time, due to its excellent moisturizing and antiseptic properties, it is also widely used in various cosmetic products such as high-end skin care, baby care, and sunscreen. In addition, 1,2-pentanediol is also often used in polyester fibers, surfactants, medicines and other related fields. 1,5-Pentanediol is an important pharmaceutical intermediate and has broad application prospects in many fields such as plasticizers, cosmetics and synthetic fragrances. In industry, 1,2-pentanediol and 1,5-pentanediol are mainly obtained through the selective redox reaction of petroleum. However, this process has problems such as complex routes, low yield of target products, and non-renewable petroleum, making it difficult to expand production on a large scale. Therefore, the selective hydrogenolysis of furfural to produce 1,2-pentanediol and 1,5-pentanediol has considerable advantages. In this reaction, first, furfural is hydrogenated to furfuryl alcohol, and then furanol undergoes hydrogenolysis, and the C5-O1 bonds are broken to form 1,2-pentanediol, and the C2-O1 bonds are broken to form 1,5-pentanediol. Since all the reactant atoms are utilized, the atomic utilization rate of this process is very high.

[0004] However, the hydrogenolysis of furfural has multiple parallel or series reaction pathways, with multiple chain breaks and hydrogenations at C=C bonds, CO bonds, COC bonds, etc., and numerous by-products. Therefore, it is challenging to selectively hydrogenate and open the ring to prepare 1,2-pentanediol and 1,5-pentanediol. At present, the hydrogenolysis of furfural to prepare 1,2-pentanediol and 1,5-pentanediol generally adopts precious metal catalysts such as Ru, Pt, Pd, etc., which have problems such as low yield of target product, harsh reaction conditions, and high catalyst preparation price. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a metal-modified Cu / MgO catalyst, a preparation method thereof and an application thereof in the preparation of pentanediol from furfural.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The invention provides a metal-modified Cu / MgO catalyst. The composition of the metal-modified Cu / MgO catalyst is Cu / MgO-M, wherein M is any one of Ca, Zn and Co, the mass of M is 2-15% of the mass of magnesium oxide, and the loading amount of Cu is 5-35% of the mass of the metal-modified Cu / MgO catalyst.

[0008] Technical principle: The metal-modified Cu / MgO catalyst provided by the present invention is composed of Cu, MgO and M. Cu plays a major catalytic role as a metal active center and is applied to furfural hydrogenation. MgO and M are used as carriers, which are used to load Cu on the one hand and to load reaction substrates and provide alkaline sites on the other hand. By adding a metal carrier M to the Cu / MgO catalyst, the metal carrier M can further improve the alkaline site of the carrier, and in the preparation process of the catalyst, the metal carrier M can be partially reduced to form oxygen vacancies on the surface, which is beneficial to the adsorption of the substrate on the catalyst, thereby improving the selectivity of the catalyst. The metal-modified Cu / MgO catalyst provided by the present invention has good hydrogenolysis activity and selectivity for furfural under relatively mild conditions, and does not produce obvious polymers.

[0009] Furthermore, the M is Ca or Zn, the mass of M is 10-15% of the mass of magnesium oxide, and the loading amount of Cu is 15-30% of the mass of the metal-modified Cu / MgO catalyst.

[0010] The present invention provides a method for preparing the metal-modified Cu / MgO catalyst described in the above technical solution, comprising the following steps:

[0011] S1. Dissolve the copper salt, magnesium salt and M salt in water and stir to obtain a salt solution;

[0012] S2. Dissolve sodium hydroxide and sodium carbonate in water and stir to obtain an alkaline solution;

[0013] S3. Under stirring, the salt solution obtained in step S1 is added to the alkaline solution obtained in step S2, and then aged, filtered, washed and dried to obtain a precursor;

[0014] S4. The precursor obtained in step S3 is sequentially calcined and reduced to obtain the metal-modified Cu / MgO catalyst;

[0015] There is no order between step S1 and step S2.

[0016] Furthermore, in step S1, the copper salt is copper nitrate, the magnesium salt is magnesium nitrate, and the M salt is calcium nitrate, zinc nitrate or cobalt nitrate.

[0017] Furthermore, in step S1, the molar ratio of copper in the copper salt, magnesium in the magnesium salt and M in the M salt is 5:72:(1-5).

[0018] Furthermore, in step S2, the molar concentration of sodium hydroxide in the alkaline solution is 1.8 times the molar concentration of all metal cations in the salt solution, and the molar concentration of sodium carbonate is 1.8 times the molar concentration of Cu in the salt solution. 2+ twice the molar concentration.

[0019] Further, in step S3, the amount of the salt solution obtained in step S1 is added until the pH value of the alkaline solution obtained in step S2 is 10±0.5; and / or,

[0020] The aging temperature is 70° C. and the aging time is 4 h.

[0021] Further, in step S4, the calcination temperature is 500° C. and the calcination time is 4 hours; and / or,

[0022] The reduction temperature is 260° C., the reduction time is 2 h, and the reduction atmosphere is hydrogen.

[0023] The present invention also provides the use of the metal-modified Cu / MgO catalyst described in the above technical solution in the preparation of pentanediol from furfural.

[0024] Furthermore, the reaction temperature of furfural to pentanediol is 160° C., the initial pressure is 5 MPa, the reaction time is 8 h, and the reaction solvent is ethanol; and / or,

[0025] The pentanediol is one or both of 1,2-pentanediol and 1,5-pentanediol.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] 1. The metal-modified Cu / MgO catalyst provided by the present invention has the advantages of high activity and high selectivity for the reaction of furfural to pentanediol, and uses non-precious metals.

[0028] 2. The preparation method of the metal-modified Cu / MgO catalyst provided by the present invention is simple to operate, easy to recycle, and the product is easy to separate and can be recycled.

[0029] 3. The reaction solvent for preparing pentanediol from furfural in the present invention is ethanol, which is cheap and widely available. It is a green solvent with the advantages of low production cost and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 XRD diagrams of the Cu / MgO-10%Ca catalyst prepared in Example 2 and the Cu / MgO catalyst prepared in Comparative Example 1. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] An embodiment of the present invention provides a metal-modified Cu / MgO catalyst, wherein the composition of the metal-modified Cu / MgO catalyst is Cu / MgO-M, wherein M is any one of Ca, Zn and Co, the mass of M is 2 to 15% of the mass of magnesium oxide, and the loading amount of Cu is 5 to 35% of the mass of the metal-modified Cu / MgO catalyst.

[0035] In a preferred embodiment, the Cu loading refers to the mass percentage of Cu.

[0036] In a preferred embodiment, M is any one of Ca, Zn and Co, preferably Ca or Zn, and more preferably Ca. The present invention adopts the above metal-modified Cu / MgO catalyst because alkaline metals can inhibit side reactions and carbon deposition and improve the selectivity of pentanediol.

[0037] In a preferred embodiment, the mass of M is 2-15% of the mass of magnesium oxide, preferably 10-15%, and more preferably 10%. In the present invention, the content of M will affect the selectivity of the catalyst. If the content of M is too low, the adsorption amount of the substrate on the catalyst will be reduced, and the conversion of furfural cannot be effectively achieved. If the content of M is too high, the active sites will be covered, reducing the contact between the reaction substrate and the active center, resulting in a decrease in catalytic activity.

[0038] In a preferred embodiment, the Cu loading is 5-35% of the mass of the metal-modified Cu / MgO catalyst, preferably 15-30%, and more preferably 30%. The Cu in the present invention is an active component, and its loading has a great influence on the hydrogenolysis activity and selectivity of the catalyst. If the Cu loading is too low, the hydrogenolysis activity of the catalyst is low. If the Cu loading is too high, the dispersion of Cu decreases, the exposure of the active center decreases, and the furfural conversion rate decreases.

[0039] The present invention provides a method for preparing the metal-modified Cu / MgO catalyst described in the above technical solution, comprising the following steps:

[0040] S1. Dissolve the copper salt, magnesium salt and M salt in water and stir to obtain a salt solution;

[0041] S2. Dissolve sodium hydroxide and sodium carbonate in water and stir to obtain an alkaline solution;

[0042] S3. Under stirring, the salt solution obtained in step S1 is added to the alkaline solution obtained in step S2, and then aged, filtered, washed and dried to obtain a precursor;

[0043] S4. The precursor obtained in step S3 is sequentially calcined and reduced to obtain the metal-modified Cu / MgO catalyst;

[0044] There is no order between step S1 and step S2.

[0045] In a preferred embodiment, in step S1, the copper salt is copper nitrate, the magnesium salt is magnesium nitrate, and the M salt is calcium nitrate, zinc nitrate or cobalt nitrate.

[0046] In a preferred embodiment, in step S1, the molar ratio of copper in the copper salt, magnesium in the magnesium salt and M in the M salt is 5:72:(1-5).

[0047] In a preferred embodiment, in step S2, the molar concentration of sodium hydroxide in the alkaline solution is 1.8 times the molar concentration of all metal cations in the salt solution, and the molar concentration of sodium carbonate is 1.8 times the molar concentration of Cu in the salt solution. 2+ The reason why the molar concentration of sodium hydroxide and the molar concentration of sodium carbonate in the alkaline solution are controlled within the above range is to regulate the precipitation rate and control the particle size and distribution at the same time. The concentration of the precipitant directly affects the precipitation rate of the metal precursor ions. Too high a concentration will lead to too fast precipitation and may form uneven particles, while too low a concentration will lead to too slow precipitation.

[0048] In a preferred embodiment, in step S3, the amount of the salt solution obtained in step S1 added is such that the pH value of the alkaline solution obtained in step S2 reaches 10±0.5.

[0049] In a preferred embodiment, in step S3, the aging temperature is 70° C. and the aging time is 4 hours.

[0050] In a preferred embodiment, in step S4, the calcination temperature is 500°C and the calcination time is 4 hours. During the calcination process, precursors such as carbonates and hydroxides decompose to generate corresponding oxides; controlling the calcination temperature and time within the above range is conducive to obtaining a catalyst with good hydrogenolysis activity and selectivity, while too high a calcination temperature will cause the copper species to sinter and destroy the carrier structure, too low a calcination temperature will not fully decompose the precursor, and sufficient surface alkaline sites may not be formed, affecting the catalytic performance, and too long a calcination time will induce phase change or crystallization, forming a crystalline phase with no catalytic activity, reducing the catalytic effect, and too short a calcination time may not form an ideal pore structure, affecting the diffusion of reactants and products.

[0051] In a preferred embodiment, in step S4, the reduction temperature is 260°C, the reduction time is 2 hours, and the reduction atmosphere is hydrogen. During the reduction process, copper oxide is reduced to Cu 0 or Cu + Controlling the reduction temperature and time within the above range is conducive to obtaining a catalyst with good hydrogenolysis activity and selectivity. However, if the reduction temperature is too high, the copper particles will sinter, resulting in an increase in particle size, a decrease in specific surface area, a decrease in active sites, and a decrease in catalyst activity. If the reduction temperature is too low, the reduction is incomplete and the copper oxide cannot be completely reduced to the active metal Cu. 0 , the activity of the catalyst is reduced, and if the reduction time is too long, the copper particles will sinter or over-reduced, causing the copper particles to aggregate or react with the carrier, thereby reducing the activity of the catalyst. If the reduction time is too short, the reduction is insufficient, the catalyst stability is weakened, and the number of active sites is reduced.

[0052] The present invention also provides the use of the metal-modified Cu / MgO catalyst described in the above technical solution in the preparation of pentanediol from furfural.

[0053] In a preferred embodiment, the reaction temperature for preparing pentanediol from furfural is 160° C., the initial pressure is 5 MPa, the reaction time is 8 h, and the reaction solvent is ethanol.

[0054] In a preferred embodiment, the pentanediol is one or both of 1,2-pentanediol and 1,5-pentanediol.

[0055] The room temperature in the embodiments of the present invention refers to "25±2°C".

[0056] Unless otherwise specified, the raw materials in the examples of the present invention were purchased from commercial sources.

[0057] Example 1

[0058] A metal-modified Cu / MgO catalyst, comprising Cu / MgO-Ca, wherein the mass of Ca is 2% of the mass of magnesium oxide, and the loading amount of Cu is 30% of the mass of the metal-modified Cu / MgO catalyst;

[0059] The preparation method of the metal-modified Cu / MgO catalyst comprises the following specific steps:

[0060] S1. Dissolve copper nitrate, magnesium nitrate and calcium nitrate in a molar ratio of Cu, Mg and Ca of 5:72:1 in 100 mL of deionized water and stir to obtain a homogeneous salt solution;

[0061] S2. Dissolve sodium hydroxide and sodium carbonate in 100 mL of deionized water to obtain a homogeneous alkaline solution; wherein the molar concentration of sodium hydroxide in the homogeneous alkaline solution is 1.8 times the molar concentration of all metal cations in the homogeneous salt solution in step S1, and the molar concentration of sodium carbonate is 1.8 times the molar concentration of Cu in the homogeneous salt solution in step S1. 2+ 2 times the molar concentration;

[0062] S3. Under stirring, the homogeneous salt solution obtained in step S1 is dripped into the homogeneous alkaline solution obtained in step S2 at a uniform rate until the pH of the solution is 10±0.5 and maintained, and then aged at 70°C for 4h, then cooled to room temperature, filtered, washed and precipitated to neutrality, and dried to obtain a precursor;

[0063] S4. The precursor obtained in step S3 is placed in a muffle furnace and calcined at 500° C. for 4 h, and then reduced in a hydrogen atmosphere at 260° C. for 2 h to obtain a metal-modified Cu / MgO catalyst, which is recorded as Cu / MgO-2%Ca.

[0064] Example 2

[0065] The difference from Example 1 is that in step S1, copper nitrate, magnesium nitrate and calcium nitrate with a molar ratio of Cu, Mg and Ca of 5:72:5 are dissolved in 100 mL of deionized water and stirred evenly, recorded as Cu / MgO-10%Ca, wherein the mass of Ca is 10% of the mass of magnesium oxide, and the loading amount of Cu is 30% of the mass of the metal-modified Cu / MgO catalyst.

[0066] Example 3

[0067] The difference from Example 1 is that in step S1, copper nitrate, magnesium nitrate and zinc nitrate with a molar ratio of Cu, Mg and Zn of 5:72:1 are dissolved in 100 mL of deionized water and stirred evenly, recorded as Cu / MgO-10%Zn, wherein the mass of Zn is 10% of the mass of magnesium oxide, and the loading amount of Cu is 30% of the mass of the metal-modified Cu / MgO catalyst.

[0068] Example 4

[0069] The difference from Example 1 is that in step S1, copper nitrate, magnesium nitrate and cobalt nitrate with a molar ratio of Cu, Mg and Co of 5:72:1 are dissolved in 100 mL of deionized water and stirred evenly, recorded as Cu / MgO-10%Co, wherein the mass of Co is 10% of the mass of magnesium oxide, and the loading amount of Cu is 30% of the mass of the metal-modified Cu / MgO catalyst.

[0070] Comparative Example 1

[0071] The difference from Example 1 is that in step S1, copper nitrate and magnesium nitrate with a Cu:Mg molar ratio of 5:72 are dissolved in 100 mL of deionized water and stirred evenly, that is, no third metal is added, which is recorded as Cu / MgO.

[0072] Comparative Example 2

[0073] The difference from Example 1 is that in step S1, copper nitrate, magnesium nitrate and zirconium chloride with a molar ratio of Cu, Mg and Zr of 5:72:1 are dissolved in 100 mL of deionized water and stirred evenly, recorded as Cu / MgO-10%Zr, wherein the mass of Zr is 10% of the mass of magnesium oxide, and the loading amount of Cu is 30% of the mass of the metal-modified Cu / MgO catalyst.

[0074] Comparative Example 3

[0075] The difference from Example 1 is that in step S1, copper nitrate, magnesium nitrate and cerium nitrate with a molar ratio of Cu, Mg and Ce of 5:72:1 are dissolved in 100 mL of deionized water and stirred evenly, recorded as Cu / MgO-10%Ce, wherein the mass of Ce is 10% of the mass of magnesium oxide, and the loading amount of Cu is 30% of the mass of the metal-modified Cu / MgO catalyst.

[0076] Comparative Example 4

[0077] The difference from Example 1 is that in step S1, copper nitrate, magnesium nitrate and ferric nitrate with a molar ratio of Cu, Mg and Fe of 5:72:1 are dissolved in 100 mL of deionized water and stirred evenly, recorded as Cu / MgO-10%Fe, wherein the mass of Fe is 10% of the mass of magnesium oxide, and the loading amount of Cu is 30% of the mass of the metal-modified Cu / MgO catalyst.

[0078] Figure 1 The XRD patterns of the Cu / MgO-10%Ca catalyst prepared in Example 2 and the Cu / MgO catalyst prepared in Comparative Example 1 are shown in FIG. Figure 1It can be seen that the catalysts prepared in Example 2 and Comparative Example 1 both have obvious CuO and MgO diffraction peaks (copper oxide and magnesium oxide have similar reflection characteristic peak positions), but the diffraction peak of the Cu / MgO-10%Ca catalyst is sharper and has good crystallinity. In addition, no obvious diffraction peak related to Ca is observed in the XRD spectrum of the Cu / MgO-10%Ca catalyst, mainly due to its low content.

[0079] The catalysts prepared in Examples 1 to 4 and Comparative Examples 1 to 4 were put into a 25 mL high-pressure mechanical reactor for furfural hydrogenation reaction, specifically: 0.1 g of catalyst, 0.5 g of furfural and 12 mL of ethanol were placed in a high-pressure mechanical reactor, and the air in the reactor was replaced with high-purity hydrogen after leak detection, and the reaction was continued for 8 hours under the conditions of reaction temperature of 160 ° C, initial pressure of 5 MPa, and stirring speed of 800 rpm. After the reaction was completed, until the reaction system was cooled to room temperature, the remaining gas in the reactor was discharged, the liquid phase product was taken out, and the liquid phase and solid phase catalyst were obtained by centrifugation. The liquid phase was qualitatively and quantitatively analyzed by gas chromatography-mass spectrometry and gas chromatography, and the results are shown in Table 1.

[0080] Table 1

[0081]

[0082]

[0083] As can be seen from Table 1, the metal-modified Cu / MgO catalyst prepared in the embodiment of the present invention has a selectivity of 70.13% for pentanediol, while in Comparative Example 1, no third metal is added, and the selectivity of the obtained catalyst for pentanediol is only 48.77%. Comparative Examples 2 to 4 change the type of the third metal, and the selectivity of the obtained catalyst for pentanediol also decreases.

[0084] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A metal-modified Cu / MgO catalyst, characterized in that: The composition of the metal-modified Cu / MgO catalyst is Cu / MgO-M, wherein M is any one of Ca, Zn and Co, the mass of M is 2-15% of the mass of magnesium oxide, and the loading amount of Cu is 5-35% of the mass of the metal-modified Cu / MgO catalyst.

2. The metal-modified Cu / MgO catalyst according to claim 1, characterized in that: The M is Ca or Zn, the mass of M is 10-15% of the mass of magnesium oxide, and the loading amount of Cu is 15-30% of the mass of the metal-modified Cu / MgO catalyst.

3. The method for preparing the metal-modified Cu / MgO catalyst according to any one of claims 1 to 2, characterized in that: The steps include: S1. Dissolve the copper salt, magnesium salt and M salt in water and stir to obtain a salt solution; S2. Dissolve sodium hydroxide and sodium carbonate in water and stir to obtain an alkaline solution; S3. Under stirring, the salt solution obtained in step S1 is added to the alkaline solution obtained in step S2, and then aged, filtered, washed and dried to obtain a precursor; S4. The precursor obtained in step S3 is sequentially calcined and reduced to obtain the metal-modified Cu / MgO catalyst; There is no order between step S1 and step S2.

4. The method for preparing the metal-modified Cu / MgO catalyst according to claim 3, characterized in that: In step S1, the copper salt is copper nitrate, the magnesium salt is magnesium nitrate, and the M salt is calcium nitrate, zinc nitrate or cobalt nitrate.

5. The method for preparing the metal-modified Cu / MgO catalyst according to claim 3, characterized in that: In step S1, the molar ratio of copper in the copper salt, magnesium in the magnesium salt and M in the M salt is 5:72:(1-5).

6. The method for preparing the metal-modified Cu / MgO catalyst according to claim 3, characterized in that: In step S2, the molar concentration of sodium hydroxide in the alkaline solution is 1.8 times the molar concentration of all metal cations in the salt solution, and the molar concentration of sodium carbonate is 2+ twice the molar concentration.

7. The method for preparing the metal-modified Cu / MgO catalyst according to claim 3, characterized in that: In step S3, the amount of the salt solution obtained in step S1 added is such that the pH value of the alkaline solution obtained in step S2 reaches 10±0.5; and / or, The aging temperature is 70° C. and the aging time is 4 h.

8. The method for preparing the metal-modified Cu / MgO catalyst according to claim 3, characterized in that: In step S4, the calcination temperature is 500° C. and the calcination time is 4 hours; and / or, The reduction temperature is 260° C., the reduction time is 2 h, and the reduction atmosphere is hydrogen.

9. Use of the metal-modified Cu / MgO catalyst according to any one of claims 1 to 2 in the preparation of pentanediol from furfural.

10. The use of the metal-modified Cu / MgO catalyst in the preparation of pentanediol from furfural according to claim 9, characterized in that: The reaction temperature for preparing pentanediol from furfural is 160° C., the initial pressure is 5 MPa, the reaction time is 8 h, and the reaction solvent is ethanol; and / or, The pentanediol is one or both of 1,2-pentanediol and 1,5-pentanediol.

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