Remover for finely removing CO from hydrogen, and preparation method thereof and use thereof

Abstract

The present invention provides a remover for CO in purified hydrogen, as well as a preparation method thereof and its use. The remover provided in the present invention can thoroughly remove CO in hydrogen at a relatively low temperature, such as room temperature, so as to meet the strict requirements of fuel cells for the CO content in hydrogen. According to the remover for CO in purified hydrogen provided in the present invention, the active component of the remover comprises a complex metal oxide, the metal elements in the complex metal oxide are Cu, Ce, Mn and Bi, and the general formula of the complex metal oxide is Cu, Ce, Mn and Bi. X Ce 3-x-y-z Mn y Bi z O 4+δ where the value of the subscript for each metal element is the number of atoms of the corresponding metal element in the composite metal oxide, "4+δ" is the number of oxygen atoms required to satisfy the oxidation state of the other element, and 0.2

Description

Detailed Description of the Invention

[0001] [Technical field] The present invention relates to the technical field of removing CO from hydrogen, and in particular to a removing agent for finely removing CO from hydrogen, as well as a preparation method thereof and its use.

[0002] [Background technology] Proton exchange membrane fuel cells are very sensitive to impurities in hydrogen, therefore the purity of hydrogen used in hydrogen fuel cells must meet the requirements of ISO14687-2 standard and SAE J2719 Hydrogen Quality Standard for Fuel Cell Vehicles. The national standard requirement for pure hydrogen is that the CO in the hydrogen produced is less than 5ppm, and the requirement for high purity hydrogen is that the CO in the hydrogen produced is less than 1ppm, but in fuel cells, it is stipulated that the CO is less than 0.2ppm.

[0003] The CO impurity content of industrial pure hydrogen and high purity hydrogen cannot meet the quality requirements of hydrogen used in fuel cells, so excessive removal of CO is required. Currently, the PSA method and the TSA method are used to remove / separate CO from hydrogen. These methods are generally used to separate high concentrations of CO, and the remover used in this method needs to be reduced in situ before use, which has the risk of introducing Cl ions. H 2 O and CO 2 Since H affects the adsorption performance of these methods, 2 O and CO 2 The application of PSA to hydrogen purification for fuel cell vehicles is still under debate. It is difficult to remove the CO content to 0.2 ppm in the conventional PSA purification process. In addition, conventional catalytic oxidizers have a low CO content and a high oxidation rate. 2 In the presence of 2 There is a risk of explosion when introducing hydrogen, and side reactions with hydrogen are likely to occur.

[0004] CN109499261A discloses a system and method for removing CO from hydrogen for a proton exchange membrane fuel cell. The removal system includes a hydrogen storage tank, a CO adsorption purifier, a hydrogen heat exchanger, and a fuel cell anode, which are sequentially connected. This document provides a method for removing CO using a removal system that uses CuCl as a CO adsorbent. However, hydrogen for fuel cell vehicles has a strict requirement for Cl ions (less than 0.05 ppm), and there is a risk that this adsorbent will introduce Cl ions.

[0005] CN201210402065.X discloses a catalyst for oxidizing and removing carbon monoxide in hydrogen and a preparation method thereof. This document provides a catalyst for selectively oxidizing and removing carbon monoxide in high-concentration hydrogen, as well as a preparation method and a use method thereof. The catalyst is a support carrying an active component and an additive; the active component is Pt, and the additive is a combination of one or two of Zn, Cu, La, Ce, Pr, Fe, Sn and Co; the loading amount of the active component is 0.01-0.1% (wt%) of the catalyst, and the loading amount of the additive is 0.5-5% (wt%) of the catalyst. This document provides a precious metal catalyst that can remove carbon monoxide in hydrogen at 100°C-200°C. On the one hand, the energy consumption at high temperatures is large, on the other hand, the competitive reaction between hydrogen and CO is promoted, and H 2 This produces the by-product O.

[0006] [overview] In this respect, the present disclosure provides a remover for finely removing CO from hydrogen, a preparation method thereof, and use thereof. The remover provided by the present disclosure can remove CO from hydrogen at a relatively low temperature, such as room temperature, so as to meet the stringent requirements of fuel cells for the CO content in hydrogen.

[0007] To achieve the objectives of the present disclosure, the present disclosure provides the following technical solutions:

[0008] The present disclosure provides a removing agent for finely removing CO in hydrogen. The active ingredient of the removing agent contains a composite metal oxide, and the metal elements in the composite metal oxide are Cu, Ce, Mn, and Bi. The general formula of the composite metal oxide is Cu x Ce 3-x-y-z Mn y Bi z O 4+δ , where the value of the subscript of each metal element is the number of atoms of the corresponding metal element in the composite metal oxide, and "4 + δ" is the number of oxygen atoms required to satisfy the oxidation states of other elements, 0.2 < x < 2, 0.05 < y < 2.8, 0.05 < z < 1, and x + y + z < 3.

[0009] In some embodiments, the active ingredient of the removing agent may further optionally contain other effective components, and the other effective components are selected from one or more of oxides of Ca, oxides of K, and oxides of La. The content of the other effective components is 0.2 to 20 wt% based on the weight of the composite metal oxide.

[0010] In some embodiments, the removing agent further contains other components, and the other components include oxides of silicon and / or oxides of aluminum.

[0011] In some embodiments, the weight percentage of the other components based on the removing agent is 2 to 30%.

[0012] Preferably, in the general formula of the composite metal oxide, 1 < x < 2.

[0013] Preferably, in the general formula of the composite metal oxide, 0.05 < z < 0.5.

[0014] Preferably, in the general formula of the composite metal oxide, 0.5 < y ≤ 2, more preferably 0.5 < y ≤ 1.5.

[0015] Preferably, in the general formula of the composite metal oxide, 2.1≦x+y+z≦2.97.

[0016] Preferably, in the general formula of the composite metal oxide, <y≦2、および2.1≦x+y+z≦2.97である。

[0017] The present disclosure further provides a method for preparing a remover, comprising the steps of: 1) mixing soluble salts of metal elements corresponding to the oxides in the active ingredient to prepare an aqueous solution, adding an alkaline substance to the aqueous solution to adjust the pH to 6-9 to generate a coprecipitate, aging the coprecipitate, and filtering and washing the coprecipitate to obtain a filter cake; 2) optionally, uniformly mixing the filter cake with any other components and shaping the mixture; wherein the other components include a carrier and / or a binder, the carrier and / or the binder containing elemental silicon and / or elemental aluminum; preferably, the other components are selected from one or more of silica sol, potassium silicate, alumina sol, and pseudoboehmite; 3) Calcining to obtain said remover.

[0018] In some embodiments, the firing conditions include a firing temperature of 200 to 600° C. and a firing time of 2 to 12 hours.

[0019] The present disclosure further provides a method for removing CO in hydrogen, in which the CO in hydrogen is removed using the above-mentioned removal agent. The CO can be removed at low temperatures by the removal agent in the present disclosure. In some embodiments, the CO in hydrogen is removed at 100° C. or lower, preferably at room temperature. Furthermore, the removal is carried out in the presence or absence of oxygen.

[0020] The technical solution provided by the present disclosure has the following beneficial effects:

[0021] The remover provided by the present disclosure can remove CO from hydrogen at room temperature, which allows CO to be easily removed and has low toxicity to fuel cells. 2 The CO can be converted into hydrogen, and the purpose of removal can be achieved without (or with very little) consumption of hydrogen in the process of removing CO. The removal process based on the remover of the present disclosure is simple and easy, and has low operating costs. In addition, the CO conversion can be realized without oxygen, and the risk of explosion caused by the introduction of oxygen into hydrogen can be avoided. The remover of the present disclosure has an excellent effect on removing CO in hydrogen, and can remove CO down to 0 ppm, and the remover of the present disclosure can be adapted to remove CO at different concentration levels.

[0022] [Detailed Description] In order to facilitate the understanding of the present disclosure, the present disclosure will be further described in conjunction with examples.It should be understood that the following examples are for better understanding of the present disclosure, and do not mean that the present disclosure is limited to the following examples.

[0023] Unless otherwise defined, all technical and scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] The range endpoints and any values ​​disclosed herein are not intended to be limited to the exact ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of the various ranges can be combined, or the endpoints of the various ranges can be combined with individual point values, or the individual point values ​​can be combined to obtain one or more new numerical ranges, which numerical ranges should be considered as specifically disclosed herein.

[0025] If no specific experimental procedures or conditions are specified in the examples, the operations or conditions corresponding to conventional experimental procedures in the art can be followed. If the manufacturers of the reagents or equipment used are not specified, all the reagents or equipment are commercially available conventional products.

[0026] The present disclosure provides a remover for finely removing CO in hydrogen, the active component of the remover mainly includes the following complex metal oxides, and the metal elements in the complex metal oxides are Cu, Ce, Mn and Bi, that is, the complex metal oxide consists of Cu oxide, Ce oxide, Mn oxide and Bi oxide. In some embodiments, the active component may only include the above complex metal oxides. In the remover provided by the present disclosure, the general formula of the complex metal oxide is Cu, x Ce 3-x-y-z Mn y Bi z O 4+δ where the value of the subscript of each metal element, such as x, 3-xyz, y and z, is the number of atoms of the corresponding metal element in the complex metal oxide, and "4+δ" is the number of oxygen atoms required to satisfy the oxidation state of the other element, and is 0.2 <x<2、0.05<y<2.8、0.05<z<1、およびx+y+z<3である。

[0027] The remover provided by the present disclosure mainly takes a combination of Cu, Ce, Mn and Bi oxides as active components, and through the composite metal oxide based on these four metal elements, lattice defects are easily formed at the interface, which is beneficial for transferring electrons, creating more oxygen vacancies, enhancing the ability to release or capture oxygen molecules, enhancing the CO removal activity, and promoting the reduction of CO at low temperatures.

[0028] According to the removing agent of the present disclosure, in the general formula of the composite metal oxide, 0.2 < x < 2, 0.05 < y < 2.8, 0.05 < z < 1, and x + y + z < 3. CO in hydrogen can be more thoroughly removed by the removing agent based on the composite metal oxide at a relatively low temperature such as room temperature. In some preferred embodiments, in the general formula of the composite metal oxide, 1 < x < 2, which is beneficial for extending the usable time of the removing agent for CO removal. In some preferred embodiments, 0.05 < z < 0.5, which can improve the usable time of the removing agent for CO removal. In some preferred embodiments, 0.5 < y ≤ 2, preferably 0.5 < y ≤ 1.5, which is beneficial for extending the usable time of the removing agent for CO removal. In some preferred embodiments, 2.1 ≤ x + y + z ≤ 2.97, and the removing agent can obtain a longer usable time for CO removal. In some preferred embodiments, 0.5 < y ≤ 2 and 2.1 ≤ x + y + z ≤ 2.97, and the removing agent can obtain a longer usable time for CO removal.

[0029] In some embodiments, in addition to the above composite metal oxide, the active ingredient of the removing agent of the present disclosure can optionally contain other effective ingredients, and the other effective ingredients are selected from one or more of the oxides of Ca, the oxides of K, and the oxides of La. The content of the other active ingredient is 0.2 to 20 wt% based on the weight of the composite metal oxide (i.e., the composite metal oxide of Cu, Ce, Mn, and Bi). The introduction of additional effective ingredients is beneficial for promoting the adsorption of CO, promoting the conversion of CO to CO 2 and suppressing the generation of H 2 O.

[0030] The removing agent of the present disclosure may contain only the above active ingredient, or the above active ingredient and other components, such as oxides of silicon and / or oxides of aluminum, specifically SiO 2 and / or Al 2 O 3In some embodiments, the weight percentage of the other ingredients based on the removing agent of the present disclosure is 2-30%, and the remainder refers to the active ingredient and optionally other existing effective ingredients. SiO 2 and / or Al 2 O 3 can be derived from one or more carriers and / or binders containing silicon and / or aluminum elements, such as silica sol, potassium silicate, alumina sol and pseudoboehmite. These carriers and / or binders can be directly adopted from the corresponding raw materials available on the market, and SiO 2 and / or Al 2 O 3 The introduction of can increase the dispersibility of the active phase of the remover and the strength of the shaped particles.

[0031] The present disclosure also provides a method for preparing the remover, specifically comprising the steps of: 1) Mixing soluble salts of metal elements corresponding to the oxides in the active ingredient to prepare an aqueous solution, adding an alkaline substance to the aqueous solution and adjusting the pH to 6-9 to produce a coprecipitate, aging (e.g., aging for 10-300 minutes), filtering and washing the coprecipitate to obtain a filter cake; 2) optionally, uniformly mixing the filter cake with any other components and shaping the mixture; the other components include a carrier and / or a binder, the carrier and / or the binder including one or more of silicon element and / or aluminum element, such as silica sol, potassium silicate, alumina sol and pseudoboehmite; thereby introducing the corresponding oxide of silicon and / or oxide of aluminum into the removing agent; 3) Calcination to obtain the remover.

[0032] In step 1), "soluble salts of metal elements corresponding to oxides in the active ingredient" specifically refers to soluble salts of Cu, Ce, Mn and Bi elements, and soluble salts of Ca, K and La elements that may be contained; the soluble salts may be, but are not limited to, nitrates, sulfates, acetates, oxalates, and hydrates thereof, such as copper nitrate trihydrate, cerium nitrate hexahydrate, manganese nitrate hexahydrate, bismuth nitrate pentahydrate, etc. In some embodiments, the molar concentration of the aqueous solution prepared by mixing the soluble salts in step 1) is 0.05 to 2 mol / L.

[0033] In step 1), the alkaline substance used to adjust the pH to 6 to 9 is not particularly limited, and examples thereof include an aqueous solution of sodium hydroxide, an aqueous solution of sodium carbonate, and an aqueous solution of ammonia, and examples of the alkaline substance used include an aqueous solution having a concentration of 0.05 to 2 mol / L. In some embodiments, deionized water is specifically used for washing in step 1) to mainly remove sodium ions and the like.

[0034] In some embodiments, in step 3), the firing conditions specifically include a firing temperature of 200 to 600° C. and a firing time of 2 to 12 hours.

[0035] The present disclosure further provides a method for removing CO in hydrogen, in which CO in hydrogen is removed by using the above-mentioned remover. CO in hydrogen can be removed by the remover of the present disclosure at a temperature of 100° C. or less, specifically, for example, at room temperature. Effective removal can be achieved without the need for additional heat treatment. The remover of the present disclosure can remove CO in hydrogen in the presence or absence of oxygen, and preferably, the remover can remove CO in hydrogen in the absence of oxygen. When using conditions in which oxygen is present, there is a problem that oxygen cannot be completely converted and oxygen impurities are further mixed in.

[0036] The present disclosure is illustrated by specific examples.

[0037] Example 1: Calculated amounts of copper nitrate trihydrate, cerium nitrate hexahydrate, manganese nitrate hexahydrate, and bismuth nitrate pentahydrate were weighed and dissolved in deionized water to obtain a nitric acid solution A with a concentration of 0.2 mol / L (calculated as the molar sum of Cu, Mn, Ce, and Bi ions). Then, a NaOH aqueous solution with a concentration of 0.2 mol / L was prepared, and the NaOH aqueous solution was added to the nitrate aqueous solution A under stirring to adjust the pH to 7.5 to generate a coprecipitate. After aging the coprecipitate for 60 minutes, the coprecipitate was filtered and washed until sodium ions were removed to obtain a filter cake, which was then calcined at 400°C for 10 hours to obtain a remover that is a mixture of oxides of Cu, Ce, Mn, and Bi (i.e., a composite metal oxide). This remover is composed of CuCe according to the atomic ratio of each element. 0.4 Mn 1.5 Bi 0.1 O 4+δ where 4+δ is the number of oxygen atoms required to satisfy the oxidation states of the other elements in the general formula (the same is true for the values ​​of 4+δ in the examples that follow and will not be further elaborated upon).

[0038] Example 2-6: The removers of Examples 2 to 6 were prepared according to the preparation method of Example 1, and the only difference with Example 1 was that the amounts of copper nitrate trihydrate, cerium nitrate hexahydrate, manganese nitrate hexahydrate and bismuth nitrate pentahydrate used were adjusted, and finally Cu x Ce 3-x-y-z Mn y Bi z O 4+δ A remover having the general formula:

[0039] Example 7: The calculated amounts of copper nitrate trihydrate, cerium nitrate hexahydrate, manganese nitrate hexahydrate, and bismuth nitrate pentahydrate were weighed and dissolved in deionized water to obtain a nitric acid solution A with a concentration of 0.2 mol / L (calculated as the molar sum of Cu, Mn, Ce, and Bi ions). Then, a NaOH aqueous solution with a concentration of 0.2 mol / L was prepared, and the NaOH aqueous solution was added to the nitrate aqueous solution A under stirring to adjust the pH to 7.5 to generate a coprecipitate. After aging the coprecipitate for 60 minutes, the coprecipitate was filtered and washed until sodium ions were removed to obtain a filter cake. 8% pseudoboehmite was added to the filter cake according to the dry basis mass, uniformly kneaded, extruded, and calcined at 400 °C for 10 hours to obtain a remover. This remover is 92% CuCe 0.4 Mn 1.5 Bi 0.1 O 4+δ +8%Al 2 O 3 The scavenger was composed of aluminum oxide and an active component, with aluminum oxide accounting for 8 wt% and the active component accounting for 92 wt%. The active component was a mixture of oxides of Cu, Ce, Mn and Bi (i.e., a complex metal oxide), and each element in the active component was CuCe according to the atomic ratio. 0.4 Mn 1.5 Bi 0.1 O 4+δ was expressed as:

[0040] Example 8: The preparation process of the remover was basically the same as in Example 7, with the only difference being that the pseudoboehmite was replaced with silica sol. The obtained remover was 92% CuCe 0.4 Mn 1.5 Bi 0.1 O 4+δ +8%SiO 2 The active component was a mixture of oxides of Cu, Ce, Mn, and Bi (i.e., a complex metal oxide), and the atomic ratio of each element in the active component was CuCe 0.4 Mn 1.5 Bi 0.1 O 4+δ It is expressed as:

[0041] Example 9: The preparation process of the remover was basically the same as in Example 7, except that potassium nitrate was added to the nitric acid solution A. The obtained remover was 91% CuCe 0.4 Mn 1.5 Bi 0.1 O 4+δ +8%Al 2 O 3 +K 2 O 1%, which was composed of aluminum oxide and active components, with aluminum oxide accounting for 8 wt%, and the active components were composed of composite metal oxides of Cu, Ce, Mn, and Bi and oxides of K, with the composite metal oxides of Cu, Ce, Mn, and Bi accounting for 91 wt%, and the oxide of K accounting for 1 wt%.

[0042] [Performance inspection] At room temperature (25 °C) and atmospheric pressure, 0.5% (v / v) CO + H as the supply gas 2 The removal agent of each Example was directly loaded into the reactor tube without pretreatment, and the removal effect of the removers having different compositions on CO in the feed gas was tested under oxygen-free conditions. The results are shown in Tables 1 and 2 below.

[0043] Here, "CO penetration time" refers to monitoring the CO content at the outlet end of the reaction tube, a timer is started when the feed gas is introduced into the reaction tube, and the timer is stopped when CO is monitored at the outlet end of the reaction tube, and the time between them is called the CO penetration time. The CO content was detected by an Agilent portable chromatography micro-GC.

[0044] In Table 2, "strength" refers to the crush resistance of the remover (obtained by an automatic digital particle strength meter) divided by the length of the remover to be detected.

[0045] [Table 1]

[0046] In Table 1, x, y, and z correspond to x, y, and z in the general formula of the removing agent Cu x Ce 3-x-y-z Mn y Bi z O 4+δ .

[0047] From Table 1, it can be recognized that the effect of Example 3 is the most excellent, and its removing agent can be used for the longest time. Comparing Example 2 and Example 3, when the values of y and z are the same, the larger the value of x, the longer the passing time of the removing agent, and it can be recognized that the optimal range of x is 1 < x < 2. z represents the Bi element (with a relatively large molecular weight). In order to ensure the activity of the removing agent per unit mass, the content of this element should not be too high, and preferably 0.05 < z < 0.5.

[0048] Comparing Example 3 and Example 4, when the value of x is the same, reducing the value of y significantly shortens the passing time of the removing agent, indicating that the value of y should not be too low. Preferably, 0.5 < y ≤ 1.5 is the preferred value range of y.

[0049] Comparing Example 3 and Example 5, when x + y + z = 3, the adsorbent shows activity without Ce, but it can be recognized that the passing time is shortened from 102 minutes to 62 minutes. Comparing Example 2 and Example 6, when z = 0, the adsorbent shows activity without Bi, but it can be recognized that the passing time is shortened from 78 minutes (when the Bi content is 0.3) to 65 minutes. This indicates that some metals exhibit a synergistic effect, and the effect is not good when any of the metals is absent.

[0050]

Table 2

[0051] From Table 2, the strength values of the removing agent all improve after the introduction of aluminum oxide / silicon dioxide, Al 2 O 3It can be seen that the introduction of SiO leads to an increase in strength but a certain decrease in activity. 2 The introduction of has a more excellent effect of not only improving the strength but also improving the activity.

[0052] Comparing Example 9 with Example 7, Al 2 O 3 Based on the introduction of 2 It can be seen that the introduction of O is further increased, which not only maintains good strength but also extends the CO pass-through time from 78 to 82 minutes. It can be seen that the introduction of K is beneficial to further increase the CO removal capacity of the scavenger.

[0053] [Table 3]

[0054] Table 3 shows the evaluation results of Example 1 under different CO concentrations at 25°C and 1 bar. It can be seen that as the CO concentration decreases, the dew point of the product gas increases slightly and the passage time is extended. This indicates that the remover provided by the present disclosure can remove CO at different concentration levels in hydrogen at room temperature with little hydrogen consumption.

[0055] Those skilled in the art will understand that in light of the teachings of this specification, some modifications or adjustments can be made to the present disclosure, which are also intended to fall within the scope defined by the claims of the present disclosure.

Claims

1. A remover for finely removing CO from hydrogen, the active component of the remover comprising a complex metal oxide, the metal elements in the complex metal oxide being Cu, Ce, Mn and Bi, and the complex metal oxide having a general formula of Cu ｘ C.E. ３－ｘ－ｙ－ｚ Mn ｙ Bi ｚ O ４＋δ where the value of the subscript for each metal element is the number of atoms of the corresponding metal element in the composite metal oxide, and "4+δ" is the number of oxygen atoms required to satisfy the oxidation state of the other element, and 0.2<x<2, 0.05<y<2.8, 0.05<z<1, and x+y+z<3.

2. 2. The remover for finely removing CO in hydrogen according to claim 1, wherein the active component of the remover further optionally contains other effective components, and the other effective components are selected from one or more of oxides of Ca, oxides of K and oxides of La.

3. 3. The remover for finely removing CO in hydrogen according to claim 2, wherein the content of the other effective components is 0.2 to 20 wt % based on the weight of the composite metal oxide.

4. The remover for finely removing CO in hydrogen according to any one of claims 1 to 3, wherein the remover further comprises other components, and the other components comprise an oxide of silicon and / or an oxide of aluminum.

5. 5. The removing agent for finely removing CO in hydrogen according to claim 4, wherein the weight percentage of the other components based on the removing agent is 2-30%.

6. In the general formula of the composite metal oxide, 1<x<2; and / or 0.05<z<0.5; and / or 0.5<y≦2, preferably 0.5<y≦1.5; and / or 2.1≦x+y+z≦2.97; and / or 0.5<y≦2, and 2.1≦x+y+z≦2.

97. The remover for finely removing CO in hydrogen according to any one of claims 1 to 3.

7. A method for preparing the remover according to any one of claims 1 to 6, comprising the steps of: 1) mixing soluble salts of metal elements corresponding to the oxides in the active ingredient to prepare an aqueous solution, adding an alkaline substance to the aqueous solution and adjusting the pH to 6-9 to generate a coprecipitate, aging the coprecipitate, and filtering and washing the coprecipitate to obtain a filter cake; 2) optionally, uniformly mixing the filter cake with any other components and shaping the mixture; the other components include a carrier and / or a binder, the carrier and / or the binder containing silicon element and / or aluminum element; preferably, the other components are selected from one or more of silica sol, potassium silicate, alumina sol and pseudoboehmite; 3) Calcining to obtain the remover.

8. The preparation method according to claim 7, wherein the calcination conditions include a calcination temperature of 200-600°C and a calcination time of 2-12 hours.

9. A method for removing CO from hydrogen, comprising removing CO from hydrogen by using the removing agent according to any one of claims 1 to 6 or the removing agent prepared by the preparation method according to any one of claims 7 to 8.

10. removing CO in the hydrogen at a temperature of 100° C. or less, preferably at room temperature; The removal is performed with or without oxygen.

10. The method for removing CO from hydrogen according to claim 9.

Images