A molybdenum-doped nano-zinc oxide loaded ordered mesoporous carbon adsorbent, a preparation method thereof and a flue gas desulfurization application

Abstract

The application discloses a molybdenum-doped nano-zinc oxide loaded ordered mesoporous carbon adsorbent and a preparation method and flue gas desulfurization application thereof, and belongs to the technical field of ordered mesoporous carbon composite material preparation.The application selects ordered micro-mesoporous carbon nanospheres with high specific surface area as a carrier, and molybdenum-doped nano-zinc oxide as an active component, and can efficiently remove hydrogen sulfide gas remaining in the pores.The preparation method has simple and controllable preparation conditions, the prepared molybdenum-doped nano-zinc oxide loaded ordered mesoporous carbon adsorbent breaks through the defects of traditional zinc oxide desulfurizers, such as small sulfur capacity, unsatisfactory desulfurization precision and short service life, and has high efficiency, economy and stability, and therefore can be widely applied to the field of flue gas desulfurization.

Description

Technical Field

[0001] This invention belongs to the field of ordered mesoporous carbon composite material preparation technology, specifically relating to a molybdenum-doped nano zinc oxide supported ordered mesoporous carbon adsorbent that can be applied to industrial waste gas treatment and environmental protection, its preparation method, and its application in flue gas desulfurization. Background Technology

[0002] In typical coal gasification processes, the exhaust gas from the purification unit contains trace amounts of sulfides, which, if directly released into the atmosphere, will cause varying degrees of environmental pollution. Simultaneously, the sulfur and water vapor present in the exhaust gas components can easily attack the catalysts used in exhaust gas treatment, causing catalyst poisoning and ultimately leading to catalyst deactivation. Currently, zinc oxide is the main desulfurizing agent used for coal chemical exhaust gas treatment both domestically and internationally; however, its efficiency needs further improvement. Therefore, modifying zinc oxide to construct composite materials has certain application prospects and scientific research significance.

[0003] Metal doping is generally an effective strategy to improve the room-temperature desulfurization performance of ZnO. For example, Bezverkhyy et al. found that Cu... + During desulfurization, doped ZnO increases the concentration of sulfur vacancies in ZnS due to the "charge compensation effect," thus accelerating the desulfurization of sulfur. 2- With O 2- The exchange rate of Ni is increased, thereby improving the desulfurization performance of ZnO. Yang et al. found that Ni 2+ Doping ZnO can increase the concentration of oxygen vacancies, promote hydroxylation and H+ sulfide formation on the ZnO surface. - / S 2- With O 2- The exchange rate. Co 2+ Co is also frequently used as a dopant to modulate the desulfurization performance of ZnO. Baird et al. prepared Co-doped ZnO desulfurizers using impregnation and co-precipitation methods. Through breakthrough experiments, they showed that Co doping can improve the dispersibility of ZnO and increase its specific surface area, thereby enhancing ZnO's ability to remove H2S. Wang D et al. significantly increased the breakthrough time of hydrogen sulfide adsorption by using Mo-doped iron-based adsorbents. Chen Y et al. improved the H2S removal ability of ZnO by using ordered mesoporous carbon doped with zinc oxide / nitrogen at room temperature and pressure.

[0004] As can be seen from the above, although there are already many novel zinc oxide-based desulfurization adsorbents, given the technical problems of low sulfur capacity, unsatisfactory desulfurization accuracy, and short lifespan of pre-desulfurizing agents in coal conversion and purification units, it is necessary to develop desulfurization materials specifically suited to the above application scenarios. Identifying the binding mechanism between pre-desulfurizing agents and sulfur, understanding the key factors for improving the sulfur capacity and extending the lifespan of pre-desulfurizing agents, and developing efficient and stable desulfurization materials remain key technical problems to be solved. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the purpose of the present application is to provide a molybdenum-doped nano-zinc oxide loaded ordered mesoporous carbon adsorbent and a preparation method and flue gas desulfurization application thereof, so as to solve the technical problems of small sulfur capacity, unsatisfactory desulfurization precision and short service life of the existing zinc oxide-based adsorbent materials.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The present application discloses a preparation method of a molybdenum-doped nano-zinc oxide loaded ordered mesoporous carbon adsorbent, comprising the following steps:

[0008] 1) preparing ordered micro-mesoporous carbon nanospheres OM-CNS;

[0009] 2) dissolving a zinc source and a molybdenum source in water respectively to obtain corresponding aqueous solutions, mixing the two aqueous solutions, and then adding urea to prepare a mixed solution;

[0010] 3) adding the ordered micro-mesoporous carbon nanospheres OM-CNS prepared in step 1) to the mixed solution, then performing hydrothermal treatment, and then performing uniform precipitation treatment to prepare the molybdenum-doped nano-zinc oxide loaded ordered mesoporous carbon adsorbent.

[0011] Preferably, in step 1), the ordered micro-mesoporous carbon nanospheres OM-CNS are prepared by a soft template method, comprising:

[0012] Preparation of a low molecular weight phenolic resin, addition of an aqueous solution containing a temperature-sensitive hydrogel Pluronic F127, sufficient stirring, dilution with water and continued stirring until sedimentation occurs, and stopping the reaction;

[0013] Heat treatment of the reaction solution at 120-140℃ for 24h, filtration to collect the precipitate, washing, drying, and then carbonization treatment to remove the copolymer template to prepare the ordered micro-mesoporous carbon nanospheres OM-CNS.

[0014] Further preferably, the low molecular weight phenolic resin refers to a phenolic resin with a molecular weight of 800-1200Da.

[0015] Further preferably, the low molecular weight phenolic resin is prepared by the following method:

[0016] Mixing phenol, aqueous formaldehyde solution and aqueous NaOH solution according to a volume ratio of 3:10:70-80, stirring uniformly at 60-80℃ to prepare a low molecular weight phenolic resin.

[0017] Further preferably, the use amount ratio of the Pluronic F127 to water in the aqueous solution containing the temperature-sensitive hydrogel Pluronic F127 is 0.96 g:(10-20) mL; the sufficient stirring is 2 h of stirring treatment at 60-70℃ at a rotation speed of 300-400 rpm; the solution is diluted with water under stirring, and then continuously stirred at 60-70℃ until a small amount of sedimentation appears, i.e. the reaction is stopped.

[0018] Still further preferably, the stirring treatment at 66℃ provides energy to accelerate the reaction speed without destroying the material.

[0019] Further preferably, in step 2), the zinc source is Zn(NO3)2·6H2O and the molybdenum source is Mo(NO3)3·5H2O; wherein the use amount ratio of Zn(NO3)2·6H2O to water is 0.002 mol:100 mL, and the use amount ratio of Mo(NO3)3·5H2O to water is (0.0002-0.001) mol:100 mL.

[0020] Preferably, in step 2), the mole ratio of urea to total metal ions (Zn, Mo) is (3.40-3.50):1.

[0021] Preferably, in step 3), the hydrothermal treatment is 16-24 h of treatment at 120-150℃; the carbonization treatment for removing the copolymer template Pluronic F127 (polyethylene glycol-polypropylene glycol-polyethylene glycol (PEG-PPO-PEG) triblock copolymer) is 2 h of carbonization at 700℃ under the condition of a N2 flow of 200 mL / min.

[0022] The application discloses a molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon adsorbent prepared by the preparation method.

[0023] Preferably, the adsorbent is denoted as MoxZn1-x / OM, wherein Mo and Zn respectively represent MoO3 and ZnO, OM represents an ordered mesoporous carbon nanosphere carrier, and x represents the molar ratio of Mo / (Mo+Zn).

[0024] Further preferably, the gradient is provided with Mo 0.1 Zn 0.9 / OM, Mo 0.2 Zn 0.8 / OM, Mo 0.3 Zn 0.7 / OM, Mo 0.4 Zn 0.6 / OM and Mo 0.5 Zn 0.5 / OM.

[0025] The application discloses application of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon adsorbent in flue gas desulfurization.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] The preparation method of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon composite material disclosed by the application selects ordered micro-mesoporous carbon nanospheres with high specific surface area as a carrier, can maximally adsorb hydrogen sulfide gas generated in coal chemical industry, and uses molybdenum-doped nano zinc oxide as an active component, which can efficiently remove the hydrogen sulfide gas remaining in pores, and the preparation condition is simple and controllable. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a real object diagram of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon prepared in Example 3.

[0029] Figure 2 It is a real object diagram of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon prepared in Example 3.

[0030] Figure 3-1 It is a volume concentration change result of the activity test diagram of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon prepared in Example 3 for adsorbing hydrogen sulfide.

[0031] Figure 3-2 It is a mass concentration change result of the activity test diagram of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon prepared in Example 3 for adsorbing hydrogen sulfide.

[0032] Figure 3-3 It is a sulfur capacity change result of the activity test diagram of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon prepared in Example 3 for adsorbing hydrogen sulfide.

[0033] Figure 4 It is an SEM diagram of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon in Example 3. DETAILED DESCRIPTION

[0034] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the protection scope of the present application.

[0035] It has to be noted that the terms "first", "second", etc. as used in the description and the claims and the above figures of the present application are used to describe different objects, not to describe a particular sequential or chronological order. It is to be understood that the data so described can be interchanged, under appropriate circumstances, such that the embodiments of the application described herein can be practiced in other than the order illustrated or described herein. Moreover, the terms "comprising", "having", "including" and "containing" are to be construed open-ended, i.e. meaning "including, but not limited to", as contrasted to closed-ended terms such as "consisting of only" or "consisting of", which are used to exclude any element not specified. It is to be understood that where the application, or portions thereof, is / are described with

[0036] The application will be further described with reference to the drawings, in which:

[0037] A method for preparing a Mo-doped nano-ZnO loaded on ordered mesoporous carbon according to the present application comprises the following steps:

[0038] 1) Using a soft template method and a homogeneous precipitation method, 0.6 mL of phenol, 2.0 mL of an aqueous formaldehyde solution, and 15 mL of an aqueous NaOH solution (0.1 M) are mixed, and stirred at 70°C for 0.5 h to obtain a low molecular weight (800-1200 Da) phenolic resin.

[0039] 2) Then, a solution containing 0.96 g of F127 and 15 mL of H2O is added, and stirred at 66°C for 2 h at a rotation speed of 350 rpm. Then, 50 mL of water is added to dilute the solution under stirring. The obtained solution is continuously stirred at 66°C for 12 h until a small amount of sedimentation appears, and then the reaction is immediately stopped.

[0040] 3) 20 mL of the obtained solution and 60 mL of water are transferred into a high-pressure reaction kettle, heated at 130°C for 24 h, collected by filtration, washed with distilled water for several times, and dried at room temperature. Carbonization is performed at 700°C for 2 h under a N2 flow (200 mL / min) to remove the triblock copolymer template F127 (polyethylene glycol-polypropylene glycol-polyethylene glycol (PEG-PPO-PEG) triblock copolymer). Finally, an ordered mesoporous carbon sample (OM-CNS) is obtained.

[0041] 4) A homogeneous precipitation method was used to prepare the adsorbents. 0.1 g of Mo(N03)3.5H20 and 0.73 g of Zn(N03)2.6H20 were dissolved in 100 mL of deionized water, respectively. Then, 0.56 g of urea was added into the above solution. The molar ratio of urea to total metal ions was 3.45:1. After the above solution was mixed well, 0.8 g of ordered micro-mesoporous carbon nanospheres (OM-CNS) was added into the solution. The mixture was placed in a high-pressure reactor and heated to 108°C for 1 h. After aging for 1 h, the obtained precursor was filtered, washed, and dried at 120°C for 2 h. Then, the Mo-modified ZnO as the active component and the ordered micro-mesoporous carbon nanospheres as the support were obtained by calcining the precursor at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-Mo03 co-supported ordered micro-mesoporous carbon nanospheres adsorbents with a fixed loading of 20 wt.% were synthesized.

[0042] 5) The synthesized adsorbents were denoted as MoxZni-x / OM, where Mo, Zn, and OM represent Mo03, ZnO, and ordered micro-mesoporous carbon nanospheres, respectively, and x represents the molar ratio of Mo / (Mo+Zn). A gradient was set as (Mo0Zn1 / OM, Mo 0.1 Zn 0.9 / OM, Mo 0.2 Zn 0.8 / OM, Mo 0.3 Zn 0.7 / OM, Mo 0.4 Zn 0.6 / OM, Mo 0.5 Zn 0.5 / OM, Mo1Zn0 / OM).

[0043] Example 1

[0044] (1) 0.1 g of Mo(N03)3.5H20 and 0.73 g of Zn(N03)2.6H20 were dissolved in 100 mL of deionized water, respectively. Then, 0.56 g of urea was added into the above solution. The molar ratio of urea to total metal ions was 3.45:1. After the above solution was mixed well, 0.8 g of ordered micro-mesoporous carbon nanospheres (OM-CNS) was added into the solution. The mixture was placed in a high-pressure reactor and heated to 108°C for 1 h. After aging for 1 h, the obtained precursor was filtered, washed, and dried at 120°C for 2 h. Then, the Mo-modified ZnO as the active component and the ordered micro-mesoporous carbon nanospheres as the support were obtained by calcining the precursor at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-Mo03 co-supported ordered micro-mesoporous carbon nanospheres adsorbents with a fixed loading of 20 wt.% were synthesized.

[0045] (2) The synthesized adsorbents were denoted as Mo x Zn 1-x / OM, wherein Mo, Zn represent MoO3 and ZnO respectively, OM represents ordered micro-mesoporous carbon nanospheres support. The desulfurizer prepared this time is named Mo 0.1 Zn 0.9 / OM.

[0046] Example 2

[0047] (1) 0.23 g of Mo(NO3)3·5H2O and 0.73 g of Zn(NO3)2·6H2O were weighed and dissolved in 100 mL of deionized water respectively, then 0.64 g of urea was added after the above solutions were mixed thoroughly. The molar ratio of urea to total metal ions was 3.45:1. After the above solution was mixed thoroughly, 0.8 g of ordered micro-mesoporous carbon nanospheres (OM-CNS) was added, and the mixed solution was placed in a high-pressure reaction kettle, heated to 108°C for 1 h, aged for 1 h, and then the prepared precursor was filtered, washed, and dried at 120°C for 2 h. The desulfurizer with Mo modified nano-ZnO as the active component and ordered micro-mesoporous carbon nanospheres as the support was obtained by calcining at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-MoO3 co-loaded ordered micro-mesoporous carbon nanosphere adsorbents with a fixed loading of 20 wt.% were synthesized.

[0048] (2) The synthesized adsorbent is denoted as Mo x Zn 1-x / OM, wherein Mo, Zn represent MoO3 and ZnO respectively, OM represents ordered micro-mesoporous carbon nanospheres support. The desulfurizer prepared this time is named Mo 0.2 Zn 0.8 / OM.

[0049] Example 3

[0050] (1) 0.40 g of Mo(NO3)3·5H2O and 0.73 g of Zn(NO3)2·6H2O were weighed and dissolved in 100 mL of deionized water respectively, then 0.73 g of urea was added after the above solutions were mixed thoroughly. The molar ratio of urea to total metal ions was 3.45:1. After the above solution was mixed thoroughly, 0.8 g of ordered micro-mesoporous carbon nanospheres (OM-CNS) was added, and the mixed solution was placed in a high-pressure reaction kettle, heated to 108°C for 1 h, aged for 1 h, and then the prepared precursor was filtered, washed, and dried at 120°C for 2 h. The desulfurizer with Mo modified nano-ZnO as the active component and ordered micro-mesoporous carbon nanospheres as the support was obtained by calcining at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-MoO3 co-loaded ordered micro-mesoporous carbon nanosphere adsorbents with a fixed loading of 20 wt.% were synthesized.

[0051] (2) The synthesized adsorbent is denoted as Mo x Zn 1-x / OM, wherein Mo, Zn represent MoO3 and ZnO respectively, OM represents ordered mesoporous carbon nanospheres carrier. The desulfurizer prepared this time is named Mo 0.3 Zn 0.7 / OM.

[0052] The actual figure of the molybdenum-doped nano zinc oxide loaded with ordered mesoporous carbon prepared in this example is shown in Figure 1 and Figure 2 The SEM image is shown in Figure 4 .

[0053] Example 4

[0054] (1) 0.61 g of Mo(NO3)3·5H2O and 0.73 g of Zn(NO3)2·6H2O were weighed and dissolved in 100 mL of deionized water respectively. After the above solutions were mixed thoroughly, 0.85 g of urea was added. The molar ratio of urea to total metal ions was 3.45:1. After the above solution was mixed thoroughly, 0.8 g of ordered mesoporous carbon nanospheres (OM-CNS) was added. The mixture was placed in a high-pressure reaction kettle and heated to 108°C for 1 h, aged for 1 h. The prepared precursor was filtered, washed, and then dried at 120°C for 2 h. The desulfurizer with Mo modified nano ZnO as the active component and ordered mesoporous carbon nanospheres as the carrier was obtained by calcining at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-MoO3 co-loaded ordered mesoporous carbon nanosphere adsorbents with a fixed loading of 20wt.% were synthesized.

[0055] (2) The synthesized adsorbent is denoted as Mo x Zn 1-x / OM, wherein Mo, Zn represent MoO3 and ZnO respectively, OM represents ordered mesoporous carbon nanospheres carrier. The desulfurizer prepared this time is named Mo 0.4 Zn 0.6 / OM.

[0056] Example 5

[0057] (1) 0.92 g of Mo(N03)3.5H20 and 0.73 g of Zn(N03)2.6H20 were weighed and dissolved in 100 mL of deionized water, respectively. After the above solutions were mixed thoroughly, 1.02 g of urea was added. The molar ratio of urea to total metal ions was 3.45:1. After the above solution was mixed thoroughly, 0.8 g of ordered micro-mesoporous carbon nanospheres (OM-CNS) was added. The mixture was placed in a high-pressure reaction kettle and heated to 108°C for 1 h, aged for 1 h. The prepared precursor was filtered, washed, and dried at 120°C for 2 h. The desulfurizer with Mo modified nano-ZnO as the active component and ordered micro-mesoporous carbon nanospheres as the carrier was obtained by calcining at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-Mo03 co-loaded ordered micro-mesoporous carbon nanosphere adsorbents with a fixed loading of 20 wt.% were synthesized.

[0058] (2) The synthesized adsorbent is denoted as Mo x Zn 1-x / OM, wherein Mo and Zn represent Mo03 and ZnO, respectively, and OM represents the ordered micro-mesoporous carbon nanosphere carrier. The desulfurizer prepared this time is named Mo 0.5 Zn 0.5 / OM.

[0059] Comparative Example 1

[0060] (1) 0.92 g of Mo(N03)3.5H20 and 0.73 g of Zn(N03)2.6H20 were weighed and dissolved in 100 mL of deionized water, respectively. After the above solutions were mixed thoroughly, 1.02 g of urea was added. The molar ratio of urea to total metal ions was 3.45:1. After the above solution was mixed thoroughly, 0.8 g of ordered micro-mesoporous carbon nanospheres (OM-CNS) was added. The mixture was placed in a high-pressure reaction kettle and heated to 108°C for 1 h, aged for 1 h. The prepared precursor was filtered, washed, and dried at 120°C for 2 h. The desulfurizer with Mo modified nano-ZnO as the active component and ordered micro-mesoporous carbon nanospheres as the carrier was obtained by calcining at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-Mo03 co-loaded ordered micro-mesoporous carbon nanosphere adsorbents with a fixed loading of 20 wt.% were synthesized.

[0061] (2) The synthesized adsorbent is denoted as Mo x Zn 1-x / OM, wherein Mo and Zn represent Mo03 and ZnO, respectively, and OM represents the ordered micro-mesoporous carbon nanosphere carrier. The desulfurizer prepared this time is named Mo

[0062] Comparative Example 2

[0063] (1) 0.52 g of Mo(N03)3.5H20 and 0 g of Zn(N03)2.6H20 were weighed and dissolved in 100 mL of deionized water, respectively. After mixing the above solutions, 0.29 g of urea was added. The molar ratio of urea to total metal ions was 3.45:1. After mixing the above solution, 0.8 g of ordered micro-mesoporous carbon nanospheres (OM-CNS) was added. The mixture was placed in a high-pressure reaction kettle and heated to 108°C for 1 h, aged for 1 h. The prepared precursor was filtered, washed, and dried at 120°C for 2 h. Mo-modified ZnO as an active component and ordered micro-mesoporous carbon nanospheres as a carrier were obtained by calcining at 270°C for 1 h under N2 protection in a muffle furnace. A series of ZnO-Mo03 co-loaded ordered micro-mesoporous carbon nanosphere adsorbents with a fixed loading of 20 wt.% were synthesized.

[0064] (2) The synthesized adsorbent is denoted as Mo x Zn 1-x / OM, wherein Mo and Zn represent Mo03 and ZnO, respectively, and OM represents an ordered micro-mesoporous carbon nanosphere carrier. The desulfurizer prepared this time is named Mo1Zn0 / OM.

[0065] The desulfurizers prepared in Example 3, Comparative Example 1, and Comparative Example 2 were selected for activity testing of molybdenum-doped nano-zinc oxide loaded on ordered mesoporous carbon for adsorbing hydrogen sulfide, mainly for testing desulfurization performance.

[0066] The desulfurization test of the desulfurizer was performed in a VOCs generation and reaction device of TianDaxiBeiYang Chemical Experiment Equipment Company. The inner diameter of the reactor was 8 mm. The prepared sample was ground and sieved, and the sample with a particle size of 40-60 mesh was selected and loaded into the reactor. The sample loading mass was 0.2 g. The desulfurization reaction conditions were normal temperature and pressure. The inlet H2S concentration was 100 ppm (0.2% H2S and carrier gas N2). The gas flow rate was 200 mL / min. When the outlet H2S concentration reached 10 ppm of the inlet concentration, it was considered to be breakthrough. When the H2S concentrations in the inlet and outlet gases were the same, the sample reached adsorption saturation, and the experiment was stopped. The H2S concentrations at the inlet and outlet were detected and analyzed by using a Fuli gas chromatograph GC9790II. The breakthrough sulfur capacity and the saturation sulfur capacity of the desulfurizer were calculated by integrating the breakthrough curve of the desulfurizer.

[0067] As Figure 3-1 , Figure 3-2 and Figure 3-3 shown, from the desulfurization curve and the sulfur capacity graph, compared with the desulfurizer Mo0Zn1 / OM (Comparative Example 1) and Mo1Zn0 / OM (Comparative Example 2), Mo 0.3 Zn 0.7 / OM has better desulfurization performance. Mo 0.3 Zn 0.7The breakthrough of / OM desulfurizer was at 30 min and the complete breakthrough was at 80 min, and the saturated sulfur capacity reached 7.38 mg / g and the breakthrough sulfur capacity was 4.56 mg / g. The desulfurization performance of Mo0Zn1 / OM in the comparative example was slightly stronger than that of Mo1Zn0 / OM.

[0068] The above is only to illustrate the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical scheme falls within the protection scope of the present application.

Claims

1. Use of a molybdenum-doped nanocrystalline zinc oxide supported ordered mesoporous carbon adsorbent for adsorbing hydrogen sulfide in flue gas, characterized in that, The molybdenum-doped nano-zinc oxide loaded ordered mesoporous carbon adsorbent is denoted as MoxZn1-x / OM, wherein Mo, Zn respectively represent MoO3 and ZnO, OM represents an ordered micro-mesoporous carbon nanosphere carrier, and x represents a molar ratio of Mo / (Mo+Zn); x is 0.3, and the adsorbent is denoted as Mo 0.3 Zn 0.7 / OM; The preparation method of the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon adsorbent comprises the following steps: 1) preparing ordered micro-mesoporous carbon nanospheres OM-CNS; 2) using a homogeneous precipitation method, weighing appropriate amounts of Zn(NO3)2·6H2O and Mo(NO3)3·5H2O, respectively dissolving in 100 mL of deionized water, then mixing the two solutions above, adding an appropriate amount of urea to obtain a mixed solution; wherein the molar ratio of urea to total metal ions is 3.45:1; 3) adding 0.8 g of ordered micro-mesoporous carbon nanospheres OM-CNS to the mixed solution above, then placing it in a high-pressure reaction kettle, heating to 108 ℃ and reacting for 1 h, aging for 1 h, preparing the precursor, then filtering, washing, and then drying at 120 ℃ for 2 h, and then calcining in a muffle furnace under N2 protection at 270 ℃ for 1 h, to obtain Mo-modified nano ZnO as an active component, i.e. to obtain the molybdenum-doped nano zinc oxide loaded ordered mesoporous carbon adsorbent, which is loaded with 20wt% ZnO-MoO3.

2. Use according to claim 1, characterized in that, In step 1), the ordered micro-mesoporous carbon nanospheres OM-CNS are prepared by a soft template method, comprising: Preparation of a low molecular weight phenolic resin, adding an aqueous solution containing a temperature-sensitive hydrogel Pluronic F127, stirring uniformly, diluting with water and continuing to stir until sedimentation occurs, stopping the reaction; Heat treating the reaction liquid at 120-140 ℃ for 24 h, filtering and collecting the precipitate, washing, drying, and then carbonizing to remove the copolymer template to obtain ordered micro-mesoporous carbon nanospheres OM-CNS.

3. Use according to claim 2, characterized in that, The low molecular weight phenolic resin is prepared by the following method: Mix phenol, formaldehyde aqueous solution and NaOH aqueous solution according to a volume ratio of 3:10:70-80, stir uniformly at 60-80 ℃ to obtain a low molecular weight phenolic resin.

4. Use according to claim 2, characterized in that, The aqueous solution containing the temperature-sensitive hydrogel Pluronic F127 has a Pluronic F127 to water dosage ratio of 0.96 g:(10-20) mL; the uniform stirring is stirring treatment at 60-70 ℃ for 2 h at a speed of 300-400 rpm; the solution is diluted with water under stirring, and then continuously stirred at 60-70 ℃ until sedimentation occurs, and the reaction is stopped.

5. Use according to claim 2, characterized in that, The carbonization treatment to remove the copolymer template Pluronic F127 is carbonization at 700 ℃ under a N2 flow of 200 mL / min for 2 h.

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