CN111569821A - Composite adsorbent for methane desulfurization and decarburization and preparation method and application thereof - Google Patents
Composite adsorbent for methane desulfurization and decarburization and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a composite adsorbent for methane desulfurization and decarburization and a preparation method and application thereof, belonging to the technical field of methane impurity removal and purification. The metal oxide auxiliary agent is loaded in the hierarchical pore structure of the alkaline oxide solid waste carrier subjected to negative pressure degassing, and the metal oxide and the alkaline oxide solid waste can cooperatively play roles in desulfurization and decarburization, so that the CO content can be effectively improved2And H2The removal rate of S improves the concentration of the prepared biomass natural gas product. Effectively improves the utilization rate of the solid waste of the alkaline oxide, improves the activity and the capacity of the composite desulfurization and decarbonization adsorbent, prolongs the service life of the composite desulfurization and decarbonization adsorbent, accelerates the reaction rate, can simultaneously remove carbon dioxide and hydrogen sulfide in the methane, has no secondary pollution, and is efficient and low-costThe technology for purifying the biogas.
Description
Technical Field
The invention belongs to the technical field of impurity removal and purification of biogas, and particularly relates to a composite adsorbent for desulfurization and decarburization of biogas, and a preparation method and application thereof.
Background
The biogas is a combustible mixed gas produced by organic matters through the fermentation of microorganisms under the anaerobic condition, the main components of the biogas are methane and carbon dioxide, in addition, a small amount of hydrogen, nitrogen, carbon monoxide, hydrogen sulfide, ammonia and the like are also contained, and the volume content of the carbon dioxide is 25-40%. The concentration of hydrogen sulfide in the biogas is influenced by fermentation raw materials or fermentation processes, the content of the hydrogen sulfide is greatly changed, generally the content is 1% -3%, the value exceeds the national standard, and therefore before the biogas is used, the biogas must be firstly subjected to impurity removal and purification treatment. Through impurity removal, purification and purification of the biogas, energy can be recycled to replace traditional energy, the influence of carbon emission on greenhouse effect can be greatly reduced, and ideal carbon emission reduction benefits are achieved.
Desulfurization and decarburization are core processes for impurity removal and purification. The desulfurization is to avoid hydrogen sulfide from corroding a compressor, a gas storage tank, a pipeline and an engine and from causing catalyst poisoning; the decarburization is that the heat value, energy density and combustion speed of the biogas are reduced by the carbon dioxide, and the ignition temperature of the biogas is increased; the dehydration is to avoid the corrosion of the compressor, the gas storage tank, the pipeline and the engine caused by the dissolved gases such as hydrogen sulfide and ammonia gas after the water is accumulated in the gas guide pipeline, and to prevent the condensation or the icing of the marsh gas during the pressurized storage.
Removing CO from methane2And H2The existing methods for removing impurities and purifying the methane mainly adopt a solvent method for desulfurization and decarburization, and alcohol amine solvents are adopted for removing CO contained in natural gas2And H2S and other harmful components are removed. As the alcohol amine used in the industry, ethanolamine (MEA), Diethanolamine (DEA), Diisopropanolamine (DIPA), N-Methyldiethanolamine (MDEA) and the like are mainly used. The solvent method for desulfurization and decarburization has the problems of no selectivity, easy foaming, degradation and deterioration of the solvent, strong corrosivity, high steam pressure, large evaporation loss and the like.
The membrane separation desulfurization and decarburization technology has more advantages, but is not widely applied to the industry at present. The main reasons are the high production cost caused by the complex film-making process, and the poor performance stability of the film due to the limitation of the current industrial production level. At present, the membrane separation technology cannot ensure that the purification degree of the natural gas reaches the pipeline standard under any condition, so the traditional treatment technology is added as a final purification step.
Disclosure of Invention
In order to solve the problems, the invention discloses a composite adsorbent for methane desulfurization and decarburization and a preparation method and application thereof, which effectively improve the utilization rate of alkaline oxide solid waste, improve the activity and capacity of the composite desulfurization and decarburization adsorbent, prolong the service life of the composite desulfurization and decarburization adsorbent, accelerate the reaction rate, remove carbon dioxide and hydrogen sulfide in methane at the same time, have no secondary pollution and are a high-efficiency and low-cost methane purification technology.
The invention is realized by the following technical scheme:
the invention discloses a composite adsorbent for methane desulfurization and decarburization, wherein a metal oxide auxiliary agent is loaded in a hierarchical pore structure of an alkaline oxide solid waste carrier subjected to negative pressure degassing, and the mass ratio of the metal oxide auxiliary agent to the alkaline oxide solid waste carrier is (1-5): 20.
the invention discloses a preparation method of the composite adsorbent for methane desulfurization and decarburization, which comprises the following steps:
step 1: screening the solid waste of the alkaline oxide with particle size for later use; preparing a metal oxide into a salt solution for later use;
step 2: negative pressure degassing is carried out on the alkaline oxide solid waste under the pressure of 1-4 kPa, the negative pressure is continuously kept after degassing, and the alkaline oxide solid waste is immersed in a salt solution of a metal oxide;
and step 3: and standing at normal temperature and normal pressure after the dropwise addition is finished, drying, fully grinding and calcining to obtain the composite adsorbent.
Preferably, in the step 1, the screened alkaline oxide solid waste is irregular particles with the particle size of 90-300 microns; the salt solution is prepared by dissolving a metal oxide auxiliary agent in acid and then adding deionized water, wherein the mass concentration of the metal oxide auxiliary agent is 1-15%.
Preferably, in the step 2, the negative pressure degassing time is 1-5 h.
Preferably, in the step 3, the standing time is 1-24 h, and the drying temperature is 100 ℃.
Preferably, in step 3, the temperature rising rate of the calcination and the temperature reduction rate after the calcination are both 5 ℃/min, and the calcination time is 2 h.
Preferably, the metal oxide is potassium oxide, sodium oxide, iron oxide, calcium oxide, copper oxide, zinc oxide or cerium oxide.
Preferably, the solid waste of alkaline oxides is fly ash, carbide slag, steel slag or waste cement.
The invention discloses an application of the composite adsorbent for methane desulfurization and decarburization to methane desulfurization and decarburization, which is characterized in that the composite adsorbent and alkali liquor are prepared into suspension with the pH value of 8-10 according to the feed-liquor ratio of 50-500 g of composite adsorbent to L of alkali liquor, and methane is introduced into the suspension under a closed condition at the temperature of 60-150 ℃ to perform desulfurization and decarburization reaction.
Preferably, the alkali solution is ammonia, sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, sodium bicarbonate solution, potassium carbonate solution or potassium bicarbonate solution.
Compared with the prior art, the invention has the following beneficial technical effects:
the composite adsorbent for methane desulfurization and decarburization, disclosed by the invention, has the advantages that the metal oxide auxiliary agent is loaded in the hierarchical pore structure of the alkaline oxide solid waste carrier subjected to negative pressure degassing, the metal oxide and the alkaline oxide solid waste can cooperatively play roles in desulfurization and decarburization, and the CO can be effectively improved2And H2The removal rate of S improves the concentration of the prepared biomass natural gas product.
The preparation method of the composite adsorbent for methane desulfurization and decarburization comprises the steps of firstly carrying out negative pressure degassing on alkaline oxide solid waste particles serving as a carrier, and forming a hierarchical pore structure after degassing the carrier, so that the carrier and a metal oxide auxiliary agent are combined more tightly, the dispersion degree of the metal oxide auxiliary agent on the carrier is improved, the agglomeration of the metal oxide auxiliary agent in the reaction process is reduced, the activity and the capacity of the composite adsorbent are improved, and the service life of the composite desulfurization and decarburization adsorbent is prolonged. Meanwhile, the preparation conditions are simple, the reaction is mild, and the cost is low due to the fact that the waste is used as the raw material.
Furthermore, the alkaline oxide solid waste adopts irregular particles with the particle size of 90-300 microns after drying, so that the transportation is facilitated, and the reaction rate is improved. The mass concentration of the metal oxide auxiliary agent in the salt solution is 1-15%, the ion concentration in the solution is too high, ion agglomeration is easy to occur during loading, and the dispersion of the metal oxide on the carrier is not facilitated; the mass concentration is too low, the salt solution amount required by loading is large, and the loading efficiency is low; the solvent of the salt solution adopts deionized water, so that the influence of other impurity ions can be reduced, and the performance of the product is improved.
Furthermore, the negative pressure degassing time is 1-5 hours, so that air in the pore structure of the carrier can be sufficiently removed, the metal ion loading is facilitated, and the combination of the carrier and the metal oxide auxiliary agent is tighter.
Further, the standing time is 1-24 hours, so that the metal salt solution can enter the carrier pore channel structure under the action of pressure difference. The drying temperature was 100 ℃ and the water content of the solution was removed.
Furthermore, the temperature rise rate of the calcination and the temperature reduction rate after the calcination are both 5 ℃/min, too slow temperature rise and fall rates take too long time, and metal oxides with too fast temperature rise and fall rates are easy to generate crystallization phase change and are not beneficial to the dispersion of the metal oxides on the carrier; the calcination time is 2h, which is favorable for the conversion of the metal salt to the oxide.
Furthermore, the metal oxide adopts potassium oxide, sodium oxide, iron oxide, calcium oxide, copper oxide, zinc oxide or cerium oxide, has wide sources, and is beneficial to improving the desulfurization activity of the adsorbent.
Furthermore, the solid waste of the alkaline oxides is made of fly ash, carbide slag, steel slag or waste cement, contains a large amount of iron, magnesium, calcium and the like, is suitable for desulfurization and decarburization of the biogas, can change waste into valuable and saves resources.
The invention discloses an application of the composite adsorbent for methane desulfurization and decarburization, iron in the solid waste of alkaline oxide reacts with hydrogen sulfide under alkaline conditions to generate iron sulfide salts, and calcium, magnesium and the like in the solid waste of alkaline oxide can react with carbon dioxide under alkaline conditions to generate carbonates. The pore structure of the alkaline oxide solid waste raw material which is used as an absorbent is activated by alkali liquor, the temperature condition required by desulfurization and decarburization reactions is reduced by using solid waste slurry containing the alkali liquor, and the alkali liquor can form a liquid film on the surface of the alkaline oxide solid waste raw material, so that CO is enhanced2And H2The mobility of S molecules on the surface and inside of the adsorbent is favorable for the diffusion process, the gas-solid mass transfer is converted into the gas-liquid mass transfer, and the CO is improved2And H2The adsorption rate of S further increases the mass transfer driving force of the desulfurization and decarburization reaction, reduces the reaction temperature, improves the reaction rate and greatly shortens the reaction time. The reaction is exothermic and reduces the need for heat. Permanently to CO2And H2S, sealing and storing are carried out, leakage and later-period monitoring are avoided, the method is environment-friendly, and compared with geological sealing and storing, risks are reduced; the raw materials are simple and easy to obtain, can be recycled, and the desulfurization and decarburization process flow is simple, so that the method has a good application prospect.
Furthermore, the alkali liquor adopts ammonia water, sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, sodium bicarbonate solution, potassium carbonate solution or potassium bicarbonate solution, the source is wide, the cost is low, the reaction efficiency is high, part of the alkali liquor can be industrial waste alkali liquor, the waste can be changed into valuable, and the resources are fully utilized.
Detailed Description
The invention is further illustrated by the following specific examples and comparative examples, given with reference to different parameters, which are intended to illustrate the invention without limiting it.
Example 1
Carrying out desulfurization and decarburization reaction by using simulated methane containing 40% of carbon dioxide by volume and 3% of hydrogen sulfide by volume and the balance of methane, respectively screening to obtain 90-300 micron-sized fly ash, carbide slag, steel slag and irregular waste cement particles as carriers of the composite adsorbent, selecting iron oxide as an auxiliary agent, wherein the mass ratio of the iron oxide to different alkaline oxide solid waste carriers is 15:100, dissolving the iron oxide in nitric acid to prepare an iron nitrate solution, preparing the iron nitrate solution into a 10 wt% saline solution, placing the saline solution and the carriers in a closed device, and controlling the flow rate of the saline solution by using a valve between the salt solution and the carriers; and reducing the pressure of the mixed system of the salt solution and the carrier to 2kPa by using a vacuum pump, and keeping for 5 hours to perform negative pressure degassing. And opening a valve under the condition of negative pressure, dropping the salt solution into the carrier, standing the mixed system at normal temperature and normal pressure for 24h, drying at 100 ℃, fully grinding the obtained solid, calcining for 2h, and finally obtaining the composite adsorbent, wherein the heating and cooling rates in the calcining process are both 5 ℃/min.
The desulfurization and decarburization slurry is prepared by mixing a composite adsorbent and sodium hydroxide alkali liquor, the pH value of the slurry is 8, and the solid-liquid ratio of the slurry is 100g (composite adsorbent)/L (alkali liquor). The simulation biogas containing 40% of carbon dioxide, 3% of hydrogen sulfide and the balance of methane passes through a stirring kettle containing desulfurization and decarburization serous fluid to carry out desulfurization and decarburization reaction under the condition of sealing and heating to 120 ℃, wherein the pressure is autogenous pressure; and (3) adopting a flue gas analyzer to analyze the concentrations of carbon dioxide and hydrogen sulfide in the desulfurized and decarbonized methane on line, and calculating the removal rate, wherein the higher the removal rate is, the better the reaction effect is.
The experimental results in table 1 below show that the fly ash has the best effect, the carbon dioxide removal rate is 88%, and the hydrogen sulfide is 89%, because the fly ash has high content of alkaline oxides, which is beneficial to the desulfurization and decarburization reaction.
TABLE 1 desulfurization and decarbonization effects of different carriers of composite adsorbents
Composite adsorbent carrier | Fly ash | Carbide slag | Steel slag | Waste cement |
Carbon dioxide removal Rate (%) | 88 | 86 | 82 | 84 |
Hydrogen sulfide removal rate (%) | 89 | 82 | 87 | 84 |
Example 2
The fly ash is used as a composite adsorbent carrier, and potassium oxide, sodium oxide, ferric oxide, calcium oxide, copper oxide, zinc oxide and cerium oxide are respectively used as auxiliary components. The other conditions are the same as example 1, and the experimental results in table 2 show that the effect is best when iron oxide and cerium oxide are used, the carbon dioxide removal rate is 88%, and the hydrogen sulfide is 89%, because potassium oxide and sodium oxide have strong basicity and high carbon dioxide removal rate, but the desulfurization activity is low; iron oxide and cerium oxide are moderately alkaline and have high desulfurization activity, and iron oxide is preferred in view of catalyst preparation cost.
TABLE 2 desulfurization and decarbonization effects of composite adsorbents with different oxide assistants
Example 3
The method comprises the following steps of (1-5) taking fly ash as a composite adsorbent carrier and ferric oxide as an auxiliary agent, wherein the mass ratio of the auxiliary agent to the carrier is as follows: 20 was prepared. Other conditions are the same as example 1, and the experimental results in table 4 show that the composite adsorbent prepared when the mass ratio of the auxiliary agent to the carrier is 3:20 has the best effect, the carbon dioxide removal rate is 88%, and the hydrogen sulfide is 89%.
TABLE 3 desulfurization and decarburization effects of composite adsorbents prepared by different mass ratios of auxiliary agents to carriers
Mass ratio of auxiliary agent to carrier | 1:20 | 2:20 | 3:20 | 4:20 | 5:20 |
Carbon dioxide removal Rate (%) | 83 | 83 | 88 | 86 | 88 |
Hydrogen sulfide removal rate (%) | 81 | 87 | 89 | 89 | 83 |
Example 4
The composite adsorbent is prepared by using fly ash as a composite adsorbent carrier, ferric oxide as an auxiliary component and 1-15 wt% of salt solution. The other conditions are the same as example 1, and the experimental results in table 3 show that the composite adsorbent prepared by using the 10 wt% salt solution has the best effect, the carbon dioxide removal rate is 88%, the hydrogen sulfide is 89%, the mass concentration is too high, the ion concentration in the solution is too high, ion agglomeration is easy to occur during loading, and the dispersion of the metal oxide on the carrier is not facilitated; the mass concentration is too low, the amount of salt solution required by loading is large, the loading capacity is difficult to reach the standard due to too low solution concentration, and the loading efficiency is low.
TABLE 4 desulfurization and decarbonization effects of composite desulfurization and decarbonization adsorbent of different oxide assistants
Salt solution concentration (wt%) | 5 | 10 | 15 |
Carbon dioxide removal Rate (%) | 83 | 88 | 87 |
Hydrogen sulfide removal rate (%) | 81 | 89 | 83 |
Example 5
The preparation method is characterized in that fly ash is used as a composite adsorbent carrier, ferric oxide is used as an auxiliary component, and a vacuum pump is used for reducing the pressure of a mixed system of a salt solution and the carrier to 1-4 kPa for preparation. The other conditions are the same as example 1, and the experimental results in table 5 show that the composite adsorbent prepared by using 2kPa has the best effect, the carbon dioxide removal rate is 88%, the hydrogen sulfide is 89%, the too high system pressure cannot ensure that the loading process is carried out under the vacuum condition, the vacuum degassing of the carrier and the dispersion of the metal oxide are not facilitated, the too low system pressure has large energy consumption, the composite adsorbent prepared by using 2kPa has the best effect, the carbon dioxide removal rate is 88%, and the hydrogen sulfide is 89%.
TABLE 5 desulfurization and decarbonization effects of composite adsorbents prepared by different mixed system pressures
Mixed system pressure (kPa) | 1 | 2 | 3 | 4 |
Carbon dioxide removal Rate (%) | 88 | 88 | 86 | 88 |
Hydrogen sulfide removal rate (%) | 88 | 89 | 87 | 83 |
Example 6
The preparation method is characterized in that fly ash is used as a composite adsorbent carrier, ferric oxide is used as an auxiliary component, and a salt solution and carrier mixed system is kept stand for 1-5 hours under the pressure and negative pressure condition by a vacuum pump to prepare the composite adsorbent. The rest conditions are the same as example 1, and the experimental results in table 6 show that standing is favorable for vacuum degassing of the carrier, but the standing time is too long, the desulfurization and decarburization rates are not increased continuously, but the catalyst preparation efficiency is low, the effect of the composite adsorbent prepared by 4 hours is best, the carbon dioxide removal rate is 88%, and the hydrogen sulfide is 89%.
TABLE 6 desulfurization and decarburization effects of composite adsorbents prepared at different standing times
Standing time (h) under negative pressure | 1 | 2 | 3 | 4 | 5 |
Carbon dioxide removal Rate (%) | 81 | 82 | 88 | 88 | 88 |
Hydrogen sulfide removal rate (%) | 84 | 85 | 85 | 89 | 89 |
Example 7
The desulfurization and decarburization slurry is prepared by mixing fly ash as a composite adsorbent carrier and ferric oxide as an auxiliary component, wherein the composite adsorbent is mixed with one of ammonia water, a sodium hydroxide solution, a potassium hydroxide solution, a sodium carbonate solution, a sodium bicarbonate solution, a potassium carbonate solution and a potassium bicarbonate solution. The other conditions are the same as example 1, and the experimental results in table 7 show that the sodium hydroxide solution has strong alkalinity, is beneficial to the removal of carbon dioxide, has high solubility, is not easy to crystallize, is beneficial to the maintenance of the pH value in the desulfurization and decarburization reaction process, has low price, and has the best effect by adopting sodium hydroxide, the removal rate of carbon dioxide is 88 percent, and the hydrogen sulfide is 89 percent.
TABLE 7 desulfurization and decarburization effects of different alkali liquor components
Example 8
The fly ash is used as a composite adsorbent carrier, the ferric oxide is used as an auxiliary component, and the concentration of alkali liquor is adjusted to ensure that the pH of the desulfurization and decarburization slurry is 8, 9 and 10 respectively. The other conditions were the same as example 1, and it is understood from the results of the experiment in Table 8 that the desulfurization and decarburization reactions were carried out under alkaline conditions, and thus pH was more than 7, but too high pH resulted in waste of alkali solution, and the effect was best when pH was 8, the carbon dioxide removal rate was 88%, and the hydrogen sulfide was 89%.
TABLE 8 desulfurization and decarburization effects at different pH values
pH of the desulfurization and decarburization slurry | 8 | 9 | 10 |
Carbon dioxide removal Rate (%) | 88 | 88 | 86 |
Hydrogen sulfide removal rate (%) | 89 | 85 | 88 |
Example 9
The fly ash is used as a composite adsorbent carrier, the ferric oxide is used as an auxiliary agent component, and the solid-liquid ratio of the slurry is adjusted to be 50-500 g (composite adsorbent)/L (alkali liquor). The other conditions are the same as example 1, and the experimental results in table 9 show that the solid-liquid ratio of 100g (composite adsorbent)/L (alkali liquor) is the best, the carbon dioxide removal rate is 88%, and the hydrogen sulfide is 89%, in the system, the alkali liquor mainly plays a role in maintaining the alkaline environment of the system and promoting desulfurization and decarburization, the composite adsorbent mainly plays a role in removing hydrogen sulfide and carbon dioxide, and the desulfurization and decarburization reactions can reach higher efficiency under the condition of the moderate mass ratio of the auxiliary agent to the carrier.
TABLE 9 desulfurization and decarburization effects of different slurry solid-to-liquid ratios
Example 10
The fly ash is used as a composite adsorbent carrier, the iron oxide is used as an auxiliary agent component, and a stirring kettle is used for desulfurization and decarburization reaction under the conditions of sealed heating at the reaction temperature of 60 ℃, 90 ℃, 120 ℃ and 150 ℃. Other conditions are the same as example 1, and the experimental results in table 10 show that the effect is the best when 120 ℃ is adopted, the carbon dioxide removal rate is 88%, the hydrogen sulfide is 89%, the desulfurization and decarburization reaction rate is low when the temperature is too low, the reverse reaction is easy to occur when the desulfurization and decarburization reaction is too high, and the process energy consumption is large.
TABLE 10 desulfurization and decarburization effects at different reaction temperatures
Reaction temperature (. degree.C.) | 60 | 90 | 120 | 150 |
Carbon dioxide removal Rate (%) | 83 | 88 | 88 | 88 |
Hydrogen sulfide removal rate (%) | 88 | 85 | 89 | 85 |
It should be noted that the above description is only a preferred example of the embodiments of the present invention, and all equivalent changes made according to the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (10)
1. A composite adsorbent for desulfuration and decarburization of biogas is characterized in that the composite adsorbent is prepared by loading a metal oxide auxiliary agent in a hierarchical pore structure of an alkaline oxide solid waste carrier subjected to negative pressure degassing; the mass ratio of the metal oxide auxiliary agent to the alkaline oxide solid waste carrier is (1-5): 20.
2. the preparation method of the composite adsorbent for desulfurization and decarburization of biogas as recited in claim 1, comprising the steps of:
step 1: screening the solid waste of the alkaline oxide with particle size for later use; preparing a metal oxide auxiliary agent into a salt solution for later use;
step 2: negative pressure degassing is carried out on the alkaline oxide solid waste under the pressure of 1-4 kPa, the negative pressure is continuously kept after degassing, and the alkaline oxide solid waste is immersed in a salt solution of a metal oxide;
and step 3: and standing at normal temperature and normal pressure after the dropwise addition is finished, drying, fully grinding and calcining to obtain the composite adsorbent.
3. The preparation method of the composite adsorbent for biogas desulfurization and decarburization as claimed in claim 2, wherein in the step 1, the screened alkaline oxide solid waste is irregular particles with a particle size of 90-300 μm; the salt solution is prepared by dissolving a metal oxide auxiliary agent in acid and then adding deionized water, wherein the mass concentration of the metal oxide auxiliary agent is 1-15%.
4. The preparation method of the composite adsorbent for desulfurization and decarburization of biogas as recited in claim 2, wherein in the step 2, the time for negative pressure degassing is 1-5 hours.
5. The preparation method of the composite adsorbent for biogas desulfurization and decarburization as claimed in claim 2, wherein in the step 3, the standing time is 1-24 hours, and the drying temperature is 100 ℃.
6. The preparation method of the composite adsorbent for biogas desulfurization and decarburization as claimed in claim 2, wherein in the step 3, the temperature rise rate of calcination and the temperature drop rate after calcination are both 5 ℃/min, and the calcination time is 2 hours.
7. The method for preparing the composite adsorbent for desulfurization and decarburization of biogas as recited in claim 2, wherein the metal oxide auxiliary is potassium oxide, sodium oxide, iron oxide, calcium oxide, copper oxide, zinc oxide or cerium oxide.
8. The preparation method of the composite adsorbent for biogas desulfurization and decarburization as claimed in claim 2, wherein the solid waste of alkaline oxide is fly ash, carbide slag, steel slag or waste cement.
9. The application of the composite adsorbent for desulfurization and decarburization of biogas as claimed in claim 1 is characterized in that the composite adsorbent and alkali liquor are prepared into a suspension with pH of 8-10 according to the feed-liquor ratio of 50-500 g composite adsorbent/L alkali liquor, and biogas is introduced under a closed condition at 60-150 ℃ for desulfurization and decarburization reaction.
10. The use of the composite adsorbent for desulfurization and decarbonization of biogas according to claim 9, wherein the alkali solution is ammonia, sodium hydroxide solution, potassium hydroxide solution, sodium carbonate solution, sodium bicarbonate solution, potassium carbonate solution or potassium bicarbonate solution.
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