Method for high-selectivity adsorption of extremely low concentration of nh3 by alcohol amine ionic liquid microporous material

Abstract

The application provides a method for high-selectivity adsorption of extremely low concentration NH3 by using alcohol amine ionic liquid microporous materials, and belongs to the technical field of gas separation and purification. In the method, the ionic liquid microporous material uses a mesoporous material as a carrier, and is modified by a multi-site alcohol amine ionic liquid to form a novel ionic adsorption material with selective adsorption NH3 sites and microporous structure. Since the proton hydrogen on the cation of the alcohol amine ionic liquid can form a hydrogen bond with NH3, and the material has a micropore effect, the material can efficiently capture NH3, especially has high selectivity at extremely low NH3 concentration, and the adsorbed NH3 can be completely desorbed by heating or reducing pressure, and the adsorbent has good circulation after regeneration, and still has a high adsorption capacity after ten cycles, thereby providing a new way for efficient purification and separation of NH3.

Description

Technical Field

[0001] This invention relates to the field of NH3 capture and separation, proposing a method for the highly selective adsorption of extremely low concentrations of NH3 using an alkanolamine ionic liquid microporous material. This method uses a mesoporous material as a carrier and modifies it with a multi-site alkanolamine ionic liquid to obtain an ionic adsorbent material with selective NH3 adsorption sites and a microporous structure. Because the protonated hydrogen on the cation of the alkanolamine ionic liquid can form multi-site hydrogen bonds with NH3, coupled with the microporous effect of the material, this material exhibits excellent NH3 capture performance and deep purification capabilities, especially demonstrating high selectivity even under extremely low NH3 concentrations. Furthermore, this material can achieve complete NH3 desorption through heating or reduced pressure, and its adsorption performance remains stable after regeneration, exhibiting good recycling performance, thus providing a new pathway for the efficient purification and separation of NH3. Background Technology

[0002] The utilization of renewable energy sources (such as solar, wind, geothermal, and tidal energy) is constrained by geographical location; therefore, developing efficient energy storage carriers is crucial for realizing a large-scale renewable energy society. Hydrogen (H2), as an energy storage medium for renewable energy production, has attracted considerable attention due to its high specific energy of 120±2 MJ / kg. However, hydrogen storage and transportation face significant technological challenges. In contrast, ammonia (NH3) exhibits a superior volumetric hydrogen density of approximately 0.108 kg / L, which is 1.5 times that of liquid H2. Furthermore, at 1.0 × 10⁻⁶ m³ / L... 5 Under conditions of 0.1 MPa and 298 K, NH3 can be easily compressed and liquefied, making it convenient for storage and transportation, and possessing a relatively narrow explosion limit range (16-25%). These characteristics make it a highly promising renewable energy storage medium. Ammonia-hydrogen fuel cells are rapidly developing as an emerging energy technology, but the removal of residual trace amounts of ammonia remains one of their major challenges. During operation, ammonia is catalytically decomposed into H2 and NH3, with high-purity H2 used for power generation. However, theoretical calculations show that under specific conditions (0.1 MPa, 773–823 K), the highest ammonia conversion rate is only 99.84%, with a residual ammonia concentration of approximately 800–1300 ppm. To protect fuel cell performance, meet ISO 14687-2 standards, and prevent environmental pollution, controlling the NH3 concentration in H2 is crucial. Developing efficient and selective NH3 capture technologies to remove residual ammonia while simultaneously achieving recycling is a key research focus. Currently, porous materials such as carbon materials, metal-organic frameworks, and molecular sieves are mainly used for ammonia removal.

[0003] Ionic liquids have attracted widespread attention due to their extremely low saturated vapor pressure, which can effectively avoid losses and secondary pollution caused by solvent evaporation, while also exhibiting low energy consumption during gas desorption. Furthermore, the designable structure and tunable properties of ionic liquids enable them to achieve highly efficient absorption of NH3. Ionic liquids can be combined with various porous materials such as metal-organic frameworks, silica gel, activated carbon, hydrogen-bonded organic frameworks, and zeolites to prepare novel adsorbents. Yu et al. (ACS Sustainable Chem. Eng. 2019, 7, 11769) loaded three proton-type ionic liquids—imidazolium bis(trifluoromethanesulfonyl)imide ([Im][NTf2]), 1-methylimidazolium bis(trifluoromethanesulfonyl)imide ([1-Mim][NTf2]), and 2-methylimidazolium bis(trifluoromethanesulfonyl)imide ([2-Mim][NTf2])—on activated carbon to form porous adsorbents that improved NH3 adsorption performance. The results showed that, compared with the original activated carbon support adsorption capacity of 52.95 mg NH3 / g adsorbent, [2-Mim][NTf2]@activated carbon with an ionic liquid loading of 20 wt% exhibited a higher NH3 capacity of 68.61 mg NH3 / g adsorbent. Han et al. (Chem.Eng.J.2020,401,126106) introduced the functional ionic liquid 1-(4-hydroxybutyl)-3-methylimidazolium chloride ([BOHmim][Zn2Cl5]) with hydroxyl and metal sites into MIL-101(Cr) to obtain [BOHmim][Zn2Cl5]@MIL-101(Cr). This adsorbent material exhibited an ultra-high ammonia adsorption capacity of 410.04 mg NH3 / g adsorbent at 25 °C and 1 bar pressure. However, the adsorption equilibrium time of [BOHmim][Zn2Cl5]@MIL-101(Cr) in a humid ammonia environment was as long as 6 days.

[0004] The above studies indicate that the adsorption performance of NH3 by ionic liquid hybrid materials is influenced by various factors (such as functional groups, specific surface area, and pore size). Overall, supported ionic liquids show promising application prospects as a novel NH3 adsorption material because the pore effect of porous supports and the active sites of ionic liquids can synergistically enhance NH3 adsorption and separation. This invention proposes a method for the highly selective adsorption of extremely low concentrations of NH3 using an alkanolamine-based ionic liquid microporous material. This method uses a mesoporous material as a support and modifies it with a multi-site alkanolamine-based ionic liquid to prepare an ionic adsorption material with selective NH3 adsorption sites and a microporous structure. Because the proton hydrogen on the cation of the alkanolamine-based ionic liquid can form multi-site hydrogen bonds with NH3, coupled with the microporous effect of the material, this material exhibits excellent NH3 capture performance and deep purification capability, especially showing high selectivity even under extremely low NH3 concentration conditions. Furthermore, the material can achieve complete desorption of NH3 through heating or reduced pressure, and the adsorption performance after regeneration is stable, exhibiting good cycling performance, providing a new approach for the highly selective separation and removal of NH3. Summary of the Invention

[0005] A method for highly selectively adsorbing extremely low concentrations of NH3 using an alkanolamine-based ionic liquid microporous material is characterized by the fact that the ionic liquid microporous material is an ionic adsorbent material formed by loading an alkanolamine-based ionic liquid onto a mesoporous solid support, possessing selective NH3 adsorption sites and a microporous structure distribution. The hydrogen bonding between the protonated hydrogen in the ionic liquid and NH3, along with the microporous effect, synergistically achieves efficient NH3 capture and deep purification. The general formula of the ionic liquid structure is as follows:

[0006]

[0007] The cation is an alcohol amine derivative, and R1 on the cation is C. m H 2m+1 Or C m H 2m OH (m is an integer, 0≤m≤3), R2 is C n H 2n+1 Or C n H 2n OH (n is an integer, 0≤n≤3), R3 is C k H 2k+1 Or C k H 2k OH (k is an integer, 0≤k≤3), the anion X is Cl - NO3 - CF3SO3 - CF3COO - HSO4 - H2PO4 -NTf2 - R4COO - (R4 is C) j H 2j+1 (where j is an integer, 0 ≤ j ≤ 2).

[0008] According to claim 1, the ionic liquid microporous material has an ionic liquid mass fraction of 10-95 wt%, and the mesoporous solid support is silica aerogel, activated carbon, porous resin, silica gel, or molecular sieve.

[0009] According to claim 1, the ionic liquid microporous material has an adsorption temperature of 10–60°C and an adsorption pressure of 0.001–10 bar. The ionic liquid microporous material is regenerable under the following conditions: 60–110°C and 0.001–1.0 bar.

[0010] The method described in claim 1 is applicable to the adsorption, separation and removal of extremely low concentrations of NH3 under different conditions such as enclosed spaces, automobile exhaust, and hydrogen fuel cells.

[0011] Compared with existing ionic liquid-modified porous materials, this invention proposes a method for highly selective adsorption of extremely low concentrations of NH3 using an alkanolamine-based ionic liquid microporous material. This method utilizes a mesoporous material as a carrier, modifying it with a multi-site alkanolamine ionic liquid to form an ionic adsorbent material with selective NH3 adsorption sites and a microporous structure. Because the proton hydrogen on the cation of the alkanolamine ionic liquid can form hydrogen bonds with NH3, coupled with the microporous effect of the material, this material can efficiently capture NH3, exhibiting high selectivity, especially at extremely low NH3 concentrations. Furthermore, NH3 can be completely desorbed by heating or reducing pressure, and the regenerated adsorption performance is stable with good recyclability, providing a new approach for the efficient purification and separation of NH3. Attached Figure Description

[0012] Figure 1 The adsorption performance of [TEAH][NTf2]-P200-90 wt% for NH3 in ten cycles at 25℃

[0013] Figure 2 The adsorption performance of [TEAH][NTf2]-P250F-90wt% for NH3 in ten cycles at 25℃.

[0014] Figure 3 The adsorption performance of [TEAH][NTf2]-KSL6-90 wt% for NH3 in ten cycles at 25℃ Detailed Implementation

[0015] The technical solution of the present invention will be described in more detail below through specific embodiments. However, the present invention is not limited to the following embodiments. Any variations are included within the technical scope of the present invention without departing from the scope described above.

[0016] Example 1

[0017] 1) Dissolve 0.02 mol of triethanolamine (3.045 g) in 80 mL of anhydrous ethanol. Add the anhydrous ethanol solution of triethanolamine to a round-bottom flask and place it in an ice bath. Then, slowly add 0.02 mol (5.919 g) of bis(trifluoromethanesulfonyl)imide dropwise. After the addition is complete, stir the mixture magnetically for 48 h. Add anhydrous MgSO4 to the solution until the powdered MgSO4 no longer transforms into crystals. Then, filter out the MgSO4, wash it several times with dichloromethane, remove the anhydrous ethanol solvent by rotary evaporation, and dry it in a vacuum drying oven at 60 °C for 48 h to remove trace amounts of moisture, to obtain [TEAH][NTf2]. 1.8 g of [TEAH][NTf2] was dissolved in 20 mL of tert-butanol solution, and then 0.200 g of P200 was slowly added to the solution. The mixture was centrifuged at 8000 r / min for 10 min, and the process was repeated five times. The mixture was then freeze-dried for 48 h and the tert-butanol solvent was removed by freeze-drying at low temperature to obtain the ionic liquid microporous material [TEAH][NTf2]-P200 (ionic liquid content of 90 wt%).

[0018] 2) Dissolve 0.02 mol of triethanolamine (3.045 g) in 80 mL of anhydrous ethanol. Add the anhydrous ethanol solution of triethanolamine to a round-bottom flask and place it in an ice bath. Then, slowly add 0.02 mol (5.919 g) of bis(trifluoromethanesulfonyl)imide. After the addition is complete, stir the mixture magnetically for 48 h. Add anhydrous MgSO4 to the solution until the powdered MgSO4 no longer transforms into crystals. Filter the MgSO4 to remove the MgSO4, wash it several times with dichloromethane, remove the anhydrous ethanol solvent by rotary evaporation, and dry it in a vacuum drying oven at 60 °C for 48 h to remove trace amounts of moisture, obtaining [TEAH][NTf2]. 1.8 g of [TEAH][NTf2] was dissolved in 20 mL of tert-butanol solution, and then 0.200 g of P250F was slowly added to the solution. The mixture was centrifuged at 8000 r / min for 10 min, and the process was repeated five times. The mixture was then freeze-dried for 48 h, and the tert-butanol solvent was removed by freeze-drying at low temperature to obtain the ionic liquid microporous material [TEAH][NTf2]-P250F (ionic liquid content of 90 wt%).

[0019] 3) Dissolve 0.02 mol of triethanolamine (3.045 g) in 80 mL of anhydrous ethanol. Add the anhydrous ethanol solution of triethanolamine to a round-bottom flask and place it in an ice bath. Then, slowly add 0.02 mol (5.919 g) of bis(trifluoromethanesulfonyl)imide dropwise. After the addition is complete, stir the mixture magnetically for 48 h. Add anhydrous MgSO4 to the solution until the powdered MgSO4 no longer transforms into crystals. Filter the MgSO4 to remove the MgSO4, wash it several times with dichloromethane, remove the anhydrous ethanol solvent by rotary evaporation, and dry it in a vacuum drying oven at 60 °C for 48 h to remove trace amounts of moisture, obtaining [TEAH][NTf2]. 1.8 g of [TEAH][NTf2] was dissolved in 20 mL of tert-butanol solution, and then 0.200 g of KSL6 was slowly added to the solution. The mixture was centrifuged at 8000 r / min for 10 min, and the process was repeated five times. The mixture was then freeze-dried for 48 h, and the tert-butanol solvent was removed by freeze-drying at low temperature to obtain the ionic liquid microporous material [TEAH][NTf2]-KSL6 (ionic liquid content of 90 wt%).

[0020] Example 2

[0021] 1) The NH3 adsorption isotherm of the blank carrier material was determined using a physical adsorption analyzer. 0.10 g of P200 was tested at a temperature of 25 °C and a pressure of 0.001–1.0 bar. When the partial pressure of NH3 was 0.001 bar, the NH3 adsorption capacity was 4.74 g NH3 / g adsorbent. When the partial pressure of NH3 was 1.0 bar, the NH3 adsorption capacity was 47.23 mg NH3 / g adsorbent. The results are shown in Table 1.

[0022] 2) The NH3 adsorption isotherm of the blank carrier material was determined using a physical adsorption analyzer. 0.10 g of P250F was tested at a temperature of 25 °C and a pressure of 0.001–1.0 bar. When the partial pressure of NH3 was 0.001 bar, the NH3 adsorption capacity was 4.80 g NH3 / g adsorbent. When the partial pressure of NH3 was 1.0 bar, the NH3 adsorption capacity was 42.54 mg NH3 / g adsorbent. The results are shown in Table 1.

[0023] 3) The NH3 adsorption isotherm of the blank carrier material was determined using a physical adsorption instrument. 0.10 g of KSL6 was tested at a temperature of 25 °C and a pressure of 0.001–1.0 bar. When the partial pressure of NH3 was 0.001 bar, the NH3 adsorption capacity was 2.56 g NH3 / g adsorbent. When the partial pressure of NH3 was 1.0 bar, the NH3 adsorption capacity was 5.29 mg NH3 / g adsorbent. The results are shown in Table 1.

[0024] 4) The NH3 adsorption isotherm of the ionic liquid microporous material was determined using a physical adsorption analyzer. 0.10 g of [TEAH][NTf2]-P200-90 wt% synthesized in Example 1(1), at a temperature of 25°C and a pressure of 0.001–1.0 bar, showed an NH3 adsorption capacity of 5.33 g NH3 / g adsorbent at an NH3 partial pressure of 0.001 bar and 164.86 mg NH3 / g adsorbent at an NH3 partial pressure of 1.0 bar. The results are shown in Table 1.

[0025] 5) The NH3 adsorption isotherm of the ionic liquid microporous material was determined using a physical adsorption analyzer. 0.10 g of [TEAH][NTf2]-P250F-90wt% synthesized in Example 1 (2) was tested at 25°C and pressures of 0.001–1.0 bar. At an NH3 partial pressure of 0.001 bar, the NH3 adsorption capacity was 4.10 g NH3 / g adsorbent, and at an NH3 partial pressure of 1.0 bar, the NH3 adsorption capacity was 155.09 mg NH3 / g adsorbent. The results are shown in Table 1.

[0026] 6) The NH3 adsorption isotherm of the ionic liquid microporous material was determined using a physical adsorption analyzer. 0.10 g of [TEAH][NTf2]-KSL6-90 wt% synthesized in Example 1 (3) was tested at 25°C and pressures of 0.001–1.0 bar. At an NH3 partial pressure of 0.001 bar, the NH3 adsorption capacity was 5.28 g NH3 / g adsorbent; at an NH3 partial pressure of 1.0 bar, the NH3 adsorption capacity was 160.99 mg NH3 / g adsorbent. The results are shown in Table 1.

[0027] Example 3

[0028] 1) The adsorption breakthrough curves of the binary mixed gas NH3 / H2 were determined using a multi-component competitive breakthrough adsorption analyzer. 0.05 g of the ionic liquid microporous material [TEAH][NTf2]-P200-90 wt% synthesized in Example 1) were tested at 25°C, a gas flow rate of 20 mL / min, a pressure of 1.0 bar, and NH3 concentrations of 1000 / 2000 / 4000 / 7000 / 10000 ppm, with the remaining component being H2. The NH3 adsorption capacities were 7.464 / 10.763 / 14.292 / 18.438 / 22.364 mg NH3 / g adsorbent, and the H2 adsorption capacities were 0.456 / 0.364 / 0.393 / 0.259 / 0.149 mg H2 / g, respectively. The adsorbents and NH3 / H2 selectivities were 1924 / 1735 / 1065 / 1188 / 1748, respectively, as shown in Table 2.

[0029] 2) The adsorption breakthrough curves of the binary mixed gas NH3 / H2 were determined using a multi-component competitive breakthrough adsorption analyzer. 0.05 g of the ionic liquid microporous material [TEAH][NTf2]-P250F-90wt% synthesized in Example 1 (2) were tested at 25°C, a gas flow rate of 20 mL / min, a pressure of 1.0 bar, and NH3 concentrations of 1000 / 2000 / 4000 / 7000 / 10000 ppm, with the remaining component being H2. The NH3 adsorption capacities were 6.632 / 9.274 / 13.215 / 18.306 / 22.306 mg NH3 / g adsorbent, and the H2 adsorption capacities were 0.478 / 0.434 / 0.431 / 0.251 / 0.205 mg H2 / g, respectively. The adsorbents and NH3 / H2 selectivities were 1631 / 1254 / 898 / 1217 / 1267, respectively, as shown in Table 2.

[0030] 3) The adsorption breakthrough curves of the binary mixed gas NH3 / H2 were determined using a multicomponent competitive breakthrough adsorption analyzer. 0.05 g of the ionic liquid microporous material [TEAH][NTf2]-KSL6-90 wt% synthesized in Example 1 (3) were tested at 25°C, a gas flow rate of 20 mL / min, a pressure of 1.0 bar, and NH3 concentrations of 1000 / 2000 / 4000 / 7000 / 10000 ppm, with the remaining component being H2. The NH3 adsorption capacities were 8.937 / 10.528 / 13.345 / 19.964 / 23.931 mg NH3 / g adsorbent, and the H2 adsorption capacities were 0.427 / 0.413 / 0.326 / 0.284 / 0.223 mg H2 / g, respectively. The adsorbents and NH3 / H2 selectivities were 2460 / 1497 / 1199 / 1173 / 1250, respectively, as shown in Table 2.

[0031] Example 4

[0032] 1) The adsorption breakthrough curves of the ternary mixed gas NH3 / N2 / H2 were determined using a multi-component competitive breakthrough adsorption analyzer. 0.05 g of the ionic liquid microporous material [TEAH][NTf2]-P200-90 wt% synthesized in Example 1) were used. The test temperature was 25℃, the gas flow rate was 20 mL / min, the pressure was 1.0 bar, the NH3 concentration was 1000 ppm, and the remaining components were 24.9% N2 and 75% H2. The NH3 adsorption capacity was 6.174 mg NH3 / g adsorbent, the H2 adsorption capacity was 0.284 mg H2 / g adsorbent, and the N2 adsorption capacity was 0.378 mg N2 / g adsorbent. The results are shown in Table 3.

[0033] 2) The adsorption breakthrough curves of the ternary mixed gas NH3 / N2 / H2 were determined using a multi-component competitive breakthrough adsorption analyzer. 0.05 g of the ionic liquid microporous material [TEAH][NTf2]-P250F-90wt% synthesized in Example 1(2) were used. The test temperature was 25℃, the gas flow rate was 20 mL / min, the pressure was 1.0 bar, the NH3 concentration was 1000 ppm, and the remaining components were 24.9% N2 and 75% H2. The NH3 adsorption capacity was 6.169 mg NH3 / g adsorbent, the H2 adsorption capacity was 0.258 mg H2 / g adsorbent, and the N2 adsorption capacity was 0.342 mg N2 / g adsorbent. The results are shown in Table 3.

[0034] 3) The adsorption breakthrough curves of the ternary mixed gas NH3 / N2 / H2 were determined using a multi-component competitive breakthrough adsorption analyzer. 0.05 g of the ionic liquid microporous material [TEAH][NTf2]-P200-90 wt% synthesized in Example 1 (3) was used. The test temperature was 25℃, the gas flow rate was 20 mL / min, the pressure was 1.0 bar, the NH3 concentration was 1000 ppm, and the remaining components were 24.9% N2 and 75% H2. The NH3 adsorption capacity was 7.666 mg NH3 / g adsorbent, the H2 adsorption capacity was 0.316 mg H2 / g adsorbent, and the N2 adsorption capacity was 0.470 mg N2 / g adsorbent. The results are shown in Table 3.

[0035] Example 5

[0036] 1) The NH3 adsorption isotherm curve of the ionic liquid microporous material was determined using a physical adsorption analyzer. Using 0.10 g of [TEAH][NTf2]-P200-90 wt% synthesized in Example 1), at a temperature of 25°C and an NH3 partial pressure of 1.0 bar, the NH3 adsorption capacity was 164.86 mg NH3 / g adsorbent. Regeneration and desorption conditions: desorption at 100°C under vacuum for 5 h, resulting in complete release of adsorbed NH3. The ammonia adsorption capacity was then repeatedly tested, with 10 cycles. The results are shown below. Figure 1 .

[0037] 2) The NH3 adsorption isotherm curve of the ionic liquid microporous material was determined using a physical adsorption analyzer. Using 0.10 g of [TEAH][NTf2]-P250F-90wt% synthesized in Example 1(1), at a temperature of 25°C and an NH3 partial pressure of 1.0 bar, the NH3 adsorption capacity was 155.09 mg NH3 / g adsorbent. Regeneration and desorption conditions: desorption at 100°C under vacuum for 5 h, resulting in complete release of adsorbed NH3. The ammonia adsorption capacity was then repeatedly tested, with 10 cycles. The results are shown in […]. Figure 2 .

[0038] 3) The NH3 adsorption isotherm curve of the ionic liquid microporous material was determined using a physical adsorption analyzer. Using 0.10 g of [TEAH][NTf2]-KSL6-90 wt% synthesized in Example 1(1), at a temperature of 25°C and an NH3 partial pressure of 1.0 bar, the NH3 adsorption capacity was 160.99 mg NH3 / g adsorbent. Regeneration and desorption conditions: desorption at 100°C under vacuum for 5 h, resulting in complete release of adsorbed NH3. The ammonia adsorption capacity was then repeatedly tested, with 10 cycles. The results are shown in […]. Figure 3 .

[0039] Table 1. NH3 adsorption capacity of ionic liquid microporous materials at different partial pressures at 25℃

[0040]

[0041] Table 2. Selectivity of NH3 / H2 in binary gas mixtures of different concentrations at 25℃

[0042]

[0043] Table 3 Adsorption breakthrough data under NH3 / H2 / N2 ternary gas mixture conditions at 25℃

[0044]

Claims

1. A method for highly selectively adsorbing extremely low concentrations of NH3 using an alkanolamine-based ionic liquid microporous material, characterized in that... The ionic liquid microporous material involved is an ionic adsorbent material formed by loading an alkanolamine ionic liquid onto a mesoporous solid support. It has selective adsorption sites for NH3 and a microporous structure distribution. The hydrogen bonding between the protonated hydrogen in the ionic liquid and NH3, along with the microporous effect, can synergistically achieve efficient capture and deep purification of NH3. The general formula of the ionic liquid structure is as follows: The cation is an alcohol amine derivative, and R1 on the cation is C. m H 2m+1 Or C m H 2m OH (m is an integer, 0≤m≤3), R2 is C n H 2n+1 Or C n H 2n OH (n is an integer, 0≤n≤3), R3 is C k H 2k+1 Or C k H 2k OH (k is an integer, 0≤k≤3), the anion X is Cl - NO3 - CF3SO3 - CF3COO - HSO4 - H2PO4 - NTf2 - R4COO - (R4 is C) j H 2j+1 (where j is an integer, 0 ≤ j ≤ 2).

2. In the ionic liquid microporous material according to claim 1, the ionic liquid mass fraction is 10-95 wt%, and the mesoporous solid support is silica aerogel, activated carbon, porous resin, silica gel, or molecular sieve.

3. The ionic liquid microporous material according to claim 1, with an adsorption temperature of 10-60℃ and an adsorption pressure of 0.001-10 bar, is regenerable under the following conditions: 60-110℃ and 0.001-1.0 bar.

4. The method described in claim 1 is applicable to the adsorption, separation and removal of extremely low concentrations of NH3 under different conditions such as enclosed spaces, automobile exhaust, and hydrogen fuel cells.

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