Preparation method and application of a MoS2 catalyst with regionally distributed sulfur vacancies

Abstract

This invention relates to a method for preparing and applying a MoS2 catalyst with regionally distributed sulfur vacancies. A molybdenum source and a sulfur source are stirred uniformly in deionized water to form a precursor mixture. Tetramethylammonium bromide is directly added to the mixture and stirred until homogeneous. When the stirring time is 5–30 min, an in-plane sulfur vacancy-dominated MoS2 catalyst is synthesized. When the stirring time is higher than 60–360 min, an edge sulfur vacancy-dominated MoS2 catalyst is synthesized. The catalyst is then reacted, washed, dried, and annealed to obtain the final catalyst. It is used for the hydrodeoxygenation of palmitic acid to produce alcohols or alkanes. It achieves full-chain hydrodeoxygenation of palmitic acid to hexadecane with a product selectivity of 99%. The edge sulfur vacancy-dominated MoS2(E)-A precisely controls the selective partial hydrodeoxygenation to produce hexadecane with a selectivity as high as 80%, while avoiding excessive hydrogenation and the formation of byproducts. This enables the on-demand preparation of alkanes / alcohols.

Description

Technical Field

[0001] This invention relates to the field of biomass energy utilization technology, specifically to a method for preparing a regionally distributed sulfur vacancy MoS2 catalyst and its application in the hydrogenation and deoxygenation of palmitic acid to produce alcohols or alkanes. Background Technology

[0002] Palmitic acid is a widely available, abundant, and readily available renewable raw material. Essentially a long-chain organic compound composed of carbon, hydrogen, and oxygen, its structure typically includes a long carbon chain and a carboxyl group (–COOH). Value-added chemicals can be produced through the hydrodeoxygenation reaction of palmitic acid. Initial hydrodeoxygenation yields hexadecyl alcohol, an important ingredient in cosmetics and pharmaceutical formulations; while complete hydrogenation produces hexadecane, which has a higher energy density and is a sustainable alternative to traditional aviation fuels. However, the hydrodeoxygenation reaction of palmitic acid involves multiple intermediates, resulting in low yields of individual products. This complexity necessitates that the hydrodeoxygenation catalyst precisely control the reaction steps, guiding it towards the formation of alcohols or complete hydrogenation to alkanes.

[0003] Numerous studies have shown that noble metals (Pt, Pd, Ru, etc.) exhibit high catalytic activity and selectivity for the hydrogenation of palmitic acid, but their high cost hinders their large-scale application. Non-noble metals, such as Ni, are low-cost and highly active. Chinese patent CN 115739097A discloses a Ni-supported Ti3C2 catalyst (reaction temperature 300℃, reaction hydrogen pressure 4MPa, reaction time 4h, total alkane yield 78.11%, pentadecane selectivity 56.51%); Chinese patent CN113262789A discloses a Ni / RM catalyst (reaction temperature 480℃, reaction hydrogen pressure 4.5MPa, reaction time 10h, pentadecane selectivity 71.37%, hexadecane selectivity 28.63%). However, these catalysts not only require high temperature and high pressure reaction conditions but also suffer from side reactions such as decarboxylation and decarbonylation, resulting in low hexadecane yield and reduced carbon economy.

[0004] Therefore, this invention addresses the above-mentioned problems by preparing a metal-free, sulfur-vacancy-regionally distributed MoS2 catalyst, which achieves excellent catalytic activity and single-product selectivity in the hydrodeoxygenation reaction of palmitic acid, with carbon economy approaching 100%. Summary of the Invention

[0005] To address the problems existing in existing hydrodeoxygenation catalysts, a method for preparing a regionally distributed sulfur vacancy MoS2 catalyst is proposed. The second objective of this invention is to provide a highly efficient method for hydrodeoxygenating palmitic acid into alcohols or alkanes using a regionally distributed sulfur vacancy MoS2 catalyst.

[0006] The regionally distributed sulfur vacancy MoS2 catalyst designed in this study can efficiently convert palmitic acid into alcohols or alkanes and has good cycle stability.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] Step 1. Stir the molybdenum source and sulfur source in deionized water until homogeneous to form a precursor mixture;

[0009] Step 2. Add tetramethylammonium bromide directly to the mixture from Step 1 and stir until homogeneous to obtain a mixture; when the stirring time is 5 to 30 min, a MoS2 catalyst dominated by in-plane sulfur vacancies is synthesized; when the stirring time is higher than 60 to 360 min, a MoS2 catalyst dominated by edge sulfur vacancies is synthesized.

[0010] Step 3. Transfer the mixture from Step 2 to a 100-500 mL reactor and react at 160-220 °C for 3-12 h to obtain the mixture;

[0011] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 4 to 8 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0012] Step 5. Anneal the solid powder under an inert atmosphere.

[0013] In step 1, the molybdenum source is ammonium molybdate or sodium molybdate, and the sulfur source is thioacetamide or thiourea.

[0014] Preferably, the molybdenum source in step 1 is ammonium molybdate, and the sulfur source is thioacetamide. In step 1, the mixture is stirred until homogeneous to form a precursor solution. The stirring time is 5–10 min, and the molar ratio of S / Mo in the mixture is 1.5–3:1. Preferably, the stirring time in step 1 is 5 min, and the molar ratio of S / Mo in the mixture is 2.47.

[0015] In step 2, the concentration of tetramethylammonium bromide is 0.1–0.6 mol / mL. Preferably, the concentration of tetramethylammonium bromide in step 2 is 0.42 mol / mL.

[0016] In step 5, the solid powder is annealed in an inert atmosphere. The annealing conditions are as follows: the annealing atmosphere is inert, the annealing temperature is 300–700℃, the annealing time is 1–6 h, and the heating rate is 1–10℃ / min. Preferably, the annealing temperature is 600℃, the annealing time is 3 h, and the heating rate is 2℃ / min.

[0017] The sulfur vacancy regionally distributed MoS2 catalyst prepared in this invention is used for the hydrodeoxygenation of palmitic acid to produce alcohols or alkanes.

[0018] The reaction temperature for hydrodeoxygenation is 230–270℃, the H2 reaction pressure is 1–4 MPa, and the mass ratio of fatty acids to catalyst is 5–10.

[0019] This invention achieves the directional construction of sulfur vacancies by controlling the seed nucleation time, preparing a MoS2 catalyst with regional distribution of sulfur vacancies. Its structural characteristics were verified using a multi-scale characterization system. X-ray diffraction (XRD) pattern (…) Figure 1 The characteristic diffraction peaks of the (002), (100), and (110) crystal planes of MoS2 were observed at 2θ = 13.8°, 33.5°, and 58.3° (PDF#37-1492), confirming that the catalysts obtained in Examples 1 and 5 are both hexagonal 2H-MoS2 crystal structures. Electron paramagnetic resonance (EPR) spectroscopy (EPR) Figure 2 A significant anisotropic signal was detected at g = 2.003, revealing the presence of high-density defect sites on the surface of the catalysts prepared in Examples 1 and 5. Further analysis using in-situ diffuse reflectance infrared Fourier transform spectroscopy (O2-In situ DRIFTS) was conducted. Figure 3 ), observed at 700–880 cm -1 The Mo-O-Mo bridging vibration peak at 900–1000 cm⁻¹ and the Mo=O end-group stretching vibration peak at 900–1000 cm⁻¹ correspond to oxygen adsorption sites induced by in-plane sulfur vacancies and coordinated unsaturated sites at edge sulfur vacancies, respectively. This indicates that the catalyst prepared in Example 1 is a MoS₂(P)-A catalyst dominated by in-plane sulfur vacancies, while the catalyst prepared in Example 5 is a MoS₂(E)-A catalyst dominated by edge sulfur vacancies. This regional distribution characteristic is attributed to the synergistic effect of the regulation of tetramethylammonium bromide in the precursor solution and the gradient thermal treatment process, which achieves the regional specific construction of active sites.

[0020] The sulfur vacancy regionally distributed MoS2 catalyst prepared by the above method is used for the hydrodeoxygenation of palmitic acid to produce alcohols or alkanes.

[0021] Preferably, in the continuous hydrodeoxygenation reaction of palmitic acid (palmitic acid → hexadecaldehyde → hexadecyl alcohol → hexadecene → hexadecane), the regional distribution of sulfur vacancies in the MoS2 catalyst significantly affects the product selectivity. Figure 4) Studies have found that catalysts rich in in-plane sulfur vacancies are effective in long-chain alkanes (C14-C2 ... 16 The catalyst exhibits superior catalytic activity in the formation of C, while the catalyst enriched with marginal sulfur vacancies shows better catalytic activity for the intermediate product C. 16-OH exhibits higher selectivity. This phenomenon stems from the high-density distribution of in-plane sulfur vacancies: their abundant alcohol adsorption sites effectively activate CO bonds, thereby efficiently driving the deep conversion of alcohols to alkanes; while peripheral sulfur vacancies, due to their weaker activation ability for CO bonds, tend to retain hydroxyl intermediates, leading to a shift in the reaction pathway towards C. 16 -OH enrichment shift.

[0022] MoS₂ with regionally distributed sulfur vacancies was added to 50 mL of n-decane solution containing 0.5 g of palmitic acid. The reaction conditions were set as follows: temperature 260 °C, pressure 2.5 MPa, and reaction time 5 h. After the reaction was completed, the liquid product was collected, and the conversion rate of palmitic acid and alkane products were qualitatively and quantitatively analyzed by gas chromatography.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. MoS2 materials synthesized by tetramethylammonium bromide are more likely to form a large number of regionally distributed sulfur vacancies after annealing, and the preparation method is simple.

[0025] 2. In the hydrodeoxygenation reaction of palmitic acid, the in-plane sulfur vacancy-dominated MoS2(P)-A can completely hydrodeoxygenate palmitic acid to hexadecane, while the edge sulfur vacancy-dominated MoS2(E)-A can selectively hydrodeoxygenate palmitic acid to hexadecyl alcohol. The catalytic performance of MoS2(P)-A and MoS2(E)-A is superior to existing catalysts. The in-plane sulfur vacancy-dominated MoS2(P)-A achieves the full-chain hydrodeoxygenation (HDO) of palmitic acid to hexadecane (C6H2O). 16 H 34 The product selectivity reached 99% (Table 1), breaking through the alkane yield limitation caused by excessive decarboxylation in existing catalysts (Table 1). Furthermore, the edge sulfur vacancy-dominated MoS2(E)-A precisely controlled selective partial hydrogenation deoxygenation to generate cetyl alcohol (C... 16 H 33 The selectivity of OH is as high as 80%, which is significantly better than existing catalysts (Table 1), and avoids the formation of byproducts by excessive hydrogenation.

[0026] 3. By simply adjusting the seed nucleation temperature and time, the directional construction of sulfur vacancies was achieved, enabling the on-demand preparation of alkanes / alcohols in the same reactor. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0028] Figure 1XRD spectra of the in-plane sulfur vacancy-dominated (MoS2(P)-A) catalyst in Example 1 and the edge-site-dominated (MoS2(E)-A) catalyst in Example 5;

[0029] Figure 2 EPR spectra of the in-plane sulfur vacancy-dominated (MoS2(P)-A) catalyst in Example 1 and the edge-site-dominated (MoS2(E)-A) catalyst in Example 5;

[0030] Figure 3 In-situ O2-DRIFTS spectra of the (MoS2(P)-A) catalyst dominated by in-plane sulfur vacancies in Example 1 and the (MoS2(E)-A) catalyst dominated by edge sites in Example 5;

[0031] Figure 4. The catalytic performance of palmitic acid hydrodeoxygenation of the in-plane sulfur vacancy-dominated (MoS2(P)-A) catalyst in Example 1 and the edge-site-dominated (MoS2(E)-A) catalyst in Example 5. Detailed Implementation

[0032] The present invention will be further described in detail below through embodiments, but the scope of protection of the present invention is not limited to the content described herein;

[0033] Example 1

[0034] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.42 mol / L (1.893 g) of thioacetamide according to the S / Mo molar ratio of 2.47:1, disperse them in 60 mL of deionized water and stir for 5 min to form a homogeneous precursor mixture.

[0035] Step 2. Add 3.882 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.35 mol / L relative to the total mixture, and stir for 10 min to obtain the mixture solution;

[0036] Step 3. Transfer the mixture solution from Step 2 to a 100 mL reaction vessel and react at 200 °C for 6 h to obtain a mixed solution;

[0037] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0038] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 600℃ for 3 hours at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by in-plane sulfur vacancies, named MoS2(P)-A.

[0039] Example 2

[0040] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.51 mol / L (2.299 g) of thioacetamide according to the S / Mo molar ratio of 3:1, disperse them in 60 mL of deionized water and stir for 5 min to form a homogeneous precursor mixture.

[0041] Step 2. Add 6.655 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.6 mol / L relative to the total mixture, and stir for 5 min to obtain the mixture solution;

[0042] Step 3. Transfer the mixture from Step 2 to a 100 mL reactor and react at 220 °C for 3 h to obtain the mixture;

[0043] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0044] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 300℃ for 6 hours at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by in-plane sulfur vacancies, named MoS2(P)-A.

[0045] Example 3

[0046] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.255 mol / L (1.149 g) of thioacetamide according to an S / Mo molar ratio of 1.5:1, disperse them in 60 mL of deionized water and stir for 5 min to form a homogeneous precursor mixture.

[0047] Step 2. Add 3.882 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.35 mol / L relative to the total mixture, and stir for 30 min to obtain the mixture solution;

[0048] Step 3. Transfer the mixture from Step 2 to a 100 mL reactor and react at 200 °C for 6 h to obtain the mixture;

[0049] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0050] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 600℃ for 3 hours at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by in-plane sulfur vacancies, named MoS2(P)-A.

[0051] Example 4

[0052] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.42 mol / L (1.893 g) of thioacetamide according to the S / Mo molar ratio of 2.47:1, disperse them in 60 mL of deionized water and stir for 10 min to form a homogeneous precursor mixture.

[0053] Step 2. Add 1.1091 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.1 mol / L relative to the total mixture, and stir for 10 min to obtain the mixture solution;

[0054] Step 3. Transfer the mixture from Step 2 to a 100 mL reactor and react at 160 °C for 12 h to obtain the mixture;

[0055] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0056] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 700℃ for 1 h at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by in-plane sulfur vacancies, named MoS2(P)-A.

[0057] Example 5

[0058] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.42 mol / L (1.893 g) of thioacetamide according to the S / Mo molar ratio of 2.47:1, disperse them in 60 mL of deionized water and stir for 10 min to form a homogeneous precursor mixture.

[0059] Step 2. Add 3.882 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.35 mol / L relative to the total mixture, and stir for 180 min to obtain the mixture solution;

[0060] Step 3. Transfer the mixture solution from Step 2 to a 100 mL reaction vessel and react at 200 °C for 6 h to obtain a mixed solution;

[0061] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0062] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 600℃ for 3 hours at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by edge sulfur vacancies, named MoS2(E)-A.

[0063] Example 6

[0064] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.42 mol / L (1.893 g) of thioacetamide according to the S / Mo molar ratio of 2.47:1, disperse them in 60 mL of deionized water and stir for 10 min to form a homogeneous precursor mixture.

[0065] Step 2. Add 1.1091 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.1 mol / L relative to the total mixture, and stir for 360 min to obtain the mixture solution;

[0066] Step 3. Transfer the mixture from Step 2 to a 100 mL reactor and react at 220 °C for 3 h to obtain the mixture;

[0067] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0068] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 700℃ for 1 h at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by edge sulfur vacancies, named MoS2(E)-A.

[0069] Example 7

[0070] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.51 mol / L (2.299 g) of thioacetamide according to the S / Mo molar ratio of 3:1, disperse them in 60 mL of deionized water and stir for 10 min to form a homogeneous precursor mixture.

[0071] Step 2. Add 6.6549 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.6 mol / L relative to the total mixture, and stir for 60 min to obtain the mixture solution;

[0072] Step 3. Transfer the mixture from Step 2 to a 100 mL reactor and react at 220 °C for 6 h to obtain the mixture;

[0073] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0074] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 300℃ for 6 hours at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by edge sulfur vacancies, named MoS2(E)-A.

[0075] Example 8

[0076] Step 1. Weigh 0.17 mol / L (1.999 g) of ammonium molybdate and 0.255 mol / L (1.149 g) of thioacetamide according to an S / Mo molar ratio of 1.5:1, disperse them in 60 mL of deionized water and stir for 10 min to form a homogeneous precursor mixture.

[0077] Step 2. Add 3.882 g of tetramethylammonium bromide to the mixture from Step 1, with a concentration of 0.35 mol / L relative to the total mixture, and stir for 360 min to obtain the mixture solution;

[0078] Step 3. Transfer the mixture from Step 2 to a 100 mL reactor and react at 160 °C for 12 h to obtain the mixture;

[0079] Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 6 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder.

[0080] Step 5. Anneal the dried powder under a N2 atmosphere at a temperature of 600℃ for 3 hours at a heating rate of 2℃ / min. This yields a MoS2 catalyst dominated by edge sulfur vacancies, named MoS2(E)-A.

[0081] The series of regionally distributed sulfur vacancy MoS2 catalysts obtained above were applied to the palmitic acid hydrodeoxygenation catalytic reaction system. The reaction conditions for performance evaluation were set as follows: temperature 260℃, pressure 2.5MPa, and reaction time 5h.

[0082] The specific reaction conditions are as follows:

[0083] 0.5 g of palmitic acid was ultrasonically dissolved in 50 mL of n-decane solvent and mixed thoroughly. The mixture was then added to a 100 mL reactor, along with 0.1 g of sulfur-rich vacancy MoS2 catalyst. The air inside the sealed reactor was replaced three times with H2 at 0.2 MPa. Finally, the H2 pressure was increased to 2.5 MPa, and the reactor was sealed. The rotation speed was adjusted to 300 rpm, the reaction time was 5 h, and the temperature was 260 °C to begin the reaction. After the reaction was complete and cooled to room temperature, the supernatant was collected by centrifugation. The filtered sample, after water removal, was subjected to qualitative and quantitative analysis by gas chromatography using an HP-INNOWAX column. The gas chromatographic inlet and detector temperatures were set to 325 °C, and the column oven temperature program was set to an initial temperature of 120 °C for 2 min, followed by increments of 10 °C per min. -1 The temperature was increased to 260°C at a rate of [missing information] and held for 20 min. The results show the catalytic performance graphs of the two catalysts in Examples 1 and 5. Figure 4)In comparison with existing catalysts, both MoS2(P)-A and MoS2(E)-A can achieve 100% conversion of palmitic acid, with MoS2(P)-A yielding 99% hexadecane and MoS2(E)-A yielding 80% hexadecyl alcohol.

[0084] Table 1. Reaction conditions and catalytic performance of palmitic acid hydrodeoxygenation catalyst.

[0085]

[0086]

[0087] The technical solutions disclosed and proposed in this invention can be implemented by those skilled in the art by appropriately modifying the conditions and routes, etc. Although the methods and preparation techniques of this invention have been described through preferred embodiments, those skilled in the art can obviously modify or recombine the methods and technical routes described herein without departing from the content, spirit, and scope of this invention to achieve the final preparation technique. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included within the spirit, scope, and content of this invention.

Claims

1. A method for preparing a MoS2 catalyst with regionally distributed sulfur vacancies, characterized in that, Includes the following steps: Step 1. Stir the molybdenum source and sulfur source in deionized water to form a precursor mixture; the molar ratio of S / Mo in the mixture is 1.5~3:1; Step 2. Add tetramethylammonium bromide directly to the mixture from Step 1 and stir until homogeneous to obtain a mixture; when the stirring time is 5~30 min, a MoS2 catalyst dominated by in-plane sulfur vacancies is synthesized. When the stirring time is higher than 60~360 min, a MoS2 catalyst dominated by edge sulfur vacancies is synthesized. Step 3. Transfer the mixture from Step 2 to a 100-500 mL reactor and react at 160-220 °C for 3-12 h to obtain the mixture; Step 4. Cool the mixture from Step 3 to room temperature, wash with deionized water and centrifuge 4-8 times. Dry the precipitate after washing in a refrigerated dryer to obtain a solid powder. Step 5. Anneal the solid powder under an inert atmosphere; the annealing temperature is 300~700 ℃, and the annealing time is 1~6h.

2. The method for preparing the regionally distributed sulfur vacancy MoS2 catalyst as described in claim 1, characterized in that, In step 1, the molybdenum source is ammonium molybdate or sodium molybdate, and the sulfur source is thioacetamide or thiourea.

3. The method for preparing the regionally distributed sulfur vacancy MoS2 catalyst as described in claim 1, characterized in that, In step 2, the concentration of tetramethylammonium bromide is 0.1~0.6 mol / L.

4. The method for preparing the regionally distributed sulfur vacancy MoS2 catalyst as described in claim 1, characterized in that, In step 5, the annealing conditions refer to an inert annealing atmosphere and a heating rate of 1~10 ℃ / min.

5. The regionally distributed sulfur vacancy MoS2 catalyst prepared according to claim 1 is used for the hydrodeoxygenation of palmitic acid to produce alcohols or alkanes.

6. The application of the regionally distributed sulfur vacancy MoS2 catalyst prepared according to claim 5, characterized in that, The reaction temperature for hydrodeoxygenation is 230 ~ 270℃, the H2 reaction pressure is 1 ~ 4MPa, and the mass ratio of fatty acids to catalyst is 5 ~ 10.

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