KR101990025B1 - Method of preparing Pd catalyst for synthesis of hydrogen peroxide using alkali metal, and Method of preaparing heydrogen oxide using the Pd catalyst - Google Patents

Abstract

The present invention relates to a process for preparing a palladium catalyst for the production of hydrogen peroxide using an alkali metal and a process for preparing hydrogen peroxide using the palladium catalyst.
According to the present invention, it is possible to provide a palladium catalyst for the production of hydrogen peroxide having a specifically high palladium dispersion degree on the titania carrier by adding an alkali metal when carrying palladium. In addition, when hydrogen peroxide is produced using the palladium catalyst for hydrogen peroxide production, hydrogen peroxide yield and production rate can be greatly improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing a palladium catalyst for preparing hydrogen peroxide using an alkali metal and a method for preparing hydrogen peroxide using the alkali metal,

The present invention relates to a process for preparing a palladium catalyst for the production of hydrogen peroxide using an alkali metal and a process for preparing hydrogen peroxide using the palladium catalyst.

Hydrogen peroxide is used as a bleaching agent for pulp and fiber, disinfectant disinfectant, semiconductor cleaning liquid, oxidizer for water treatment process, and environmentally friendly oxidizer for chemical reaction (propylene oxide synthesis). As of 2009, 2.2 million tons of hydrogen peroxide are being produced annually, and the demand for hydrogen peroxide is expected to rise along with the increase in propylene oxide demand.

At present, hydrogen peroxide is generated through continuous oxidation and hydrogenation processes starting from anthraquinone-based compounds. At this time, a large amount of organic solvent is used and it is generated as waste, which can cause harmful effects on the human body. In addition, there is also a problem that the production of hydrogen peroxide involves a multistage continuous process, a purification and concentration process after the production, and consumes a lot of energy.

Direct manufacturing process of synthesizing hydrogen peroxide by directly reacting hydrogen and oxygen has been attracting attention. This direct manufacturing process has been studied as an alternative process of commercial process because water is produced as a reaction by-product and use of organic solvent is low. The direct manufacturing process is simple in construction and can be manufactured where hydrogen peroxide is needed, thus greatly reducing the risk of explosion when storing and transporting hydrogen peroxide (Korean Patent Laid-Open Publication No. 2002-0032225).

Pd or Pd alloy (Pd-Au, Pd-Pt) is mainly used as a catalyst for direct production of hydrogen peroxide. In the direct hydrogen peroxide reaction, there is a side reaction in which water is generated in addition to the reaction in which hydrogen and oxygen meet to generate hydrogen peroxide. Since these side reactions are also voluntary, studies are underway to increase the selectivity of hydrogen peroxide using catalysts. In order to increase the selectivity of hydrogen peroxide in the case of palladium catalysts, many studies have been carried out to increase the selectivity of hydrogen peroxide by adding an acid and a halogen anion to the solvent.

The inventors of the present invention have confirmed that when the alkali metal is added to the titania carrier during the research and development of the hydrogen peroxide, the dispersion and surface area of the palladium catalyst are improved and the production rate of the hydrogen peroxide is greatly improved. .

The present invention provides a method for preparing a palladium catalyst for the production of hydrogen peroxide, wherein the rate of production of hydrogen peroxide is greatly improved by adding an alkali metal to the titania carrier, and to provide a palladium catalyst for the production of hydrogen peroxide.

Also, the present invention provides a method for producing hydrogen peroxide using the palladium catalyst for hydrogen peroxide production.

In order to solve the above problems,

(a) baking titania at a temperature of 200 to 950 캜 to produce a titania carrier;

(b) mixing the palladium precursor and the alkali metal precursor into a solvent;

(c) supporting the mixture on the titania carrier;

(d) drying and calcining the supported mixture; And

(e) reducing the calcined mixture. The present invention also provides a method for producing a palladium catalyst for hydrogen peroxide.

According to the present invention, the calcination in the step (a) may be performed for 2 to 12 hours.

According to the present invention, the alkali metal precursor may be selected from the group consisting of metal chlorides, metal nitrides and metal hydroxides.

According to the present invention, in the step (b), the palladium precursor and the alkali metal precursor may be mixed at a weight ratio of 1: 0.8-2.

According to the present invention, in the step (c), the mixture may be supported at 0.1 to 20% by weight based on the total weight of the titania carrier.

According to the present invention, drying may be performed at a temperature of 50 to 200 ° C. for 12 to 24 hours in the step (d), followed by baking at a temperature of 400 to 600 ° C. for 2 to 8 hours.

According to the present invention, the reduction in step (e) may be performed at a temperature of 150 to 500 ° C for 1 to 8 hours.

The present invention also relates to a titanium dioxide carrier; And a mixture of palladium and an alkali metal supported on the titania carrier.

The present invention also provides a method for producing hydrogen peroxide, which comprises reacting and reacting hydrogen and oxygen as reactants in a reactor comprising the palladium catalyst for producing hydrogen peroxide and a solvent.

According to the present invention, the solvent may be one or more solvents selected from the group consisting of methanol, ethanol and water.

According to the present invention, the solvent may further comprise at least one halogen compound selected from the group consisting of chlorine, bromine and iodine.

According to the present invention, the solvent may further comprise one kind of diacid acid selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid and nitric acid.

According to the present invention, the molar ratio of hydrogen and oxygen may be from 1: 5 to 1:15.

According to the present invention, nitrogen can be further supplied to the reactor for reaction.

According to the present invention, the reaction can be carried out at a pressure of 1 to 40 atm and at a temperature of 10 to 30 < 0 > C.

According to the present invention, it is possible to provide a palladium catalyst for the production of hydrogen peroxide having a specifically high palladium dispersion degree on the titania carrier by adding an alkali metal when carrying palladium.

In addition, when hydrogen peroxide is produced using the palladium catalyst for hydrogen peroxide production, hydrogen peroxide yield and production rate can be greatly improved.

1 is a scanning transmission microscope (STEM) image of a catalyst for the production of hydrogen peroxide according to an embodiment of the present invention and Comparative Examples 1 to 4. Fig.
FIG. 2 is a graph showing the electronic states of palladium when X-ray photoelectron spectroscopy analyzes the catalyst for the production of hydrogen peroxide according to Examples of the present invention and Comparative Examples 1 to 4.
3 is a graph showing the electronic states of sodium when X-ray photoelectron spectroscopy analyzes the catalyst for the production of hydrogen peroxide according to Examples of the present invention and Comparative Examples 1 to 5. FIG.
FIG. 4 is a graph showing hydrogen conversion, hydrogen peroxide selectivity, and hydrogen peroxide yield when hydrogen peroxide is directly produced from hydrogen and oxygen using the catalyst for hydrogen peroxide generation according to the embodiment of the present invention and Comparative Examples 1 to 4.
5 is a graph showing the rate of hydrogen peroxide generation when hydrogen peroxide is directly produced from hydrogen and oxygen using the catalyst for the production of hydrogen peroxide according to Examples of the present invention and Comparative Examples 1 to 4. FIG.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a process for preparing a palladium catalyst for the production of hydrogen peroxide using an alkali metal and a process for preparing hydrogen peroxide using the palladium catalyst.

According to the present invention, when an alkali metal is added to the palladium catalyst and the alkali metal is added in a different amount, palladium catalyst for producing hydrogen peroxide having a specific palladium dispersion degree at a specific sodium addition amount can be obtained. There have been cases in which alkali metals such as sodium, lithium, cesium, and potassium are added to noble metals such as palladium and platinum to change the electronic state of the noble metal and the degree of dispersion on the support. As can be seen from the following Examples, when the alkali metal is added to the palladium catalyst according to the present invention, high palladium dispersion and surface area can be obtained due to the effective electron exchange property of sodium and palladium.

As described above, the palladium catalyst for hydrogen peroxide produced according to the present invention has a high palladium dispersion and surface area, and can provide excellent hydrogen conversion and hydrogen peroxide production rate in the production of hydrogen peroxide from hydrogen and oxygen, have.

Specifically, the present invention provides a method for producing a titania carrier, comprising the steps of: (a) baking titania at a temperature of 200 to 950 캜 to produce a titania carrier; (b) mixing the palladium precursor and the alkali metal precursor into a solvent; (c) supporting the mixture on the titania carrier; (d) drying and calcining the supported mixture; And (e) reducing the calcined mixture. The present invention also provides a method for producing a palladium catalyst for hydrogen peroxide.

The step (a) may be performed at a temperature of 200 to 950 캜, and preferably at a temperature of 400 to 600 캜. If the calcination temperature is outside the range of 200 to 950 캜, the activity of the catalyst according to the present invention is lowered. The calcination treatment time is preferably 2 to 12 hours, more preferably 4 to 8 hours.

Next, the step (b) is a step of mixing the palladium precursor and the alkali metal precursor into a solvent. At this time, the palladium precursor is used as an active metal, and any salt capable of providing palladium may be used without particular limitation, and palladium nitrate or palladium chloride may be preferably used. The alkali metal precursor may be at least one metal chloride selected from the group consisting of lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) Or a metal hydroxide, for example, lithium chloride, lithium nitrate, and lithium hydroxide when the compound is lithium-containing alkali metal precursor. In the case of a compound containing sodium, sodium chloride, sodium nitrate, and sodium hydroxide In the case of a compound containing potassium, it may be potassium chloride, potassium nitrate and potassium hydroxide. In the case of a compound containing rubidium, it may be rubidium chloride, rubidium nitrate and rubidium hydroxide. In the case of a compound containing cesium Cesium chloride, cesium nitrate, and cesium hydroxide, and when it is francium, it may be fridic acid hydroxide.

In the step (b), the palladium precursor and the alkali metal precursor may be mixed at a weight ratio of 1: 0.8-2. As can be seen from the following examples, when the mixing ratio deviates from the above range, the activity of the catalyst according to the present invention is lowered.

Next, in the step (c), the mixture is supported on the titania carrier. At this time, the method of supporting the mixture of the palladium precursor and the alkali metal precursor dissolved in the solvent on the titania carrier is not limited thereto, but it is preferable to use the initial wetting method.

In addition, in the step (c), the mixture may be supported at 0.1 to 20 wt% based on the total weight of the titania carrier.

Next, in the step (d), drying and baking are performed, and the drying is performed at a temperature of 50 to 200 ° C for 12 to 24 hours, at a temperature of 400 to 600 ° C for 2 to 8 It is preferable that the reaction is carried out under the condition of time.

Finally, in the step (e), the fired mixture is reduced using H ₂ gas, and the reduction temperature is 150 to 500 ° C. and reduced for 1 to 8 hours. In addition, the reduction can be performed by injecting an inert gas such as N ₂ or Ar together with the H ₂ gas. After the reduction step, palladium catalyst for hydrogen peroxide production according to the present invention is finally prepared.

The present invention also relates to a pharmaceutical composition comprising a titanic carrier; And a mixture of palladium and an alkali metal supported on the titania carrier.

At this time, the palladium catalyst for producing hydrogen peroxide is not necessarily limited to the above, but it is preferable that the palladium catalyst for manufacturing hydrogen peroxide is prepared through the above-described production method, provided that the mixture of palladium and alkali metal is supported on the titania carrier.

The present invention also provides a method for producing hydrogen peroxide comprising the steps of supplying hydrogen and oxygen to a reactor containing the catalyst for producing hydrogen peroxide and a solvent and reacting the same.

The solvent may be one or more solvents selected from the group consisting of methanol, ethanol and water. Specifically, it may be methanol, ethanol, or a mixture of water and alcohol.

The solvent may further comprise a halogen compound. Preferably, the solvent may be a mixture of bromine and water, preferably a bromine (Br), chlorine (Cl) or iodine (I) And more preferably, a halogen compound containing bromine. In the palladium (Pd) particles, energetic atoms such as corners and edges are present. In these atoms, the reaction that hydrogen and oxygen meet to form water is dominant, and the generated hydrogen peroxide decomposes The reaction is dominant. When the halogen compound is added, the halogen anion is thermodynamically adsorbed on the energetic atom of palladium (Pd), so that the side reaction can be suppressed. However, when an excessive amount of a halogen compound is added, the number of active sites of palladium (Pd) is decreased to reduce the hydrogen conversion and the amount of hydrogen peroxide. The concentration of the halogen compound in the solvent is 0.01 mM to 0.1 mM And more preferably 0.05 mM to 2 mM.

Further, the solvent may further include an acid. When an acid is added, the hydrogen peroxide yield can be largely increased by suppressing the decomposition of the produced hydrogen peroxide. The acid may be sulfuric acid (H ₂ SO ₄ ), hydrochloric acid (HCl), phosphoric acid (H ₃ PO ₄ ), nitric acid (HNO ₃ ) or the like, preferably phosphoric acid.

The concentration of the acid in the solvent may be 0.01 to 1 M, preferably 0.01 to 0.05 M.

The reactants, hydrogen and oxygen, may be in a gaseous form and may be preferably fed directly to the solvent using a Dip Tube which may be contained in a solvent to improve the solubility in the solvent. The hydrogen gas may be flowed at a flow rate of 1 to 4 mL / min, and the oxygen gas may be flowed at a flow rate of 10 to 40 mL / min. More preferably, the hydrogen gas may be maintained at 1.5 to 2.5 mL / min, and the oxygen gas may be maintained at 15 to 25 mL / min, and the hydrogen: oxygen molar ratio may be 1: 5 to 1:15. If the ratio of oxygen to hydrogen is 1: 1, but the ratio of hydrogen to oxygen is lower than 1: 5, there is a risk of explosion. If oxygen is more than 1:15, The range of the hydrogen: oxygen molar ratio is preferable.

Preferably, the reactor is further reacted by supplying nitrogen as a reactant. When using nitrogen, it is possible to deviate from the explosion range even if the ratio of hydrogen to oxygen is set to 1: 1, and there is an advantage that it can be used without additional nitrogen separation when using oxygen in the air in the future.

While the hydrogen gas and the oxygen gas are flowed at a constant flow rate, the entire reaction pressure is regulated using a BPR (Back Pressure Regulator), and the reaction pressure can be measured through a pressure gauge connected to the reactor. The reaction pressure is preferably maintained at 1 to 40 atm, preferably at normal pressure, and it may be preferable to conduct the reaction while maintaining the reaction temperature at 10 to 30 ° C.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to specific examples. However, the following examples are provided only for the purpose of easier understanding of the present invention, and the scope of the present invention is not limited by the following examples.

Example

0.0433 g of palladium nitrate hydrate (Pd (NO ₃ ) * xH ₂ O, Sigma-Aldrich) and 0.0370 g of sodium nitrate (NaNO ₃ , Sigma-Aldrich) were simultaneously dissolved in 0.5798 mL DI water and calcined at 500 ° C. for 6 hours One 2 g of titania (TiO ₂ , P25, Degussa) was uniformly supported by an initial wetting method. Thereafter, the catalyst was dried at 100 DEG C for 12 hours, and then the temperature of the catalyst was raised to 2 DEG C / min and calcined at 400 DEG C for 2 hours. A mixed gas of hydrogen and nitrogen (hydrogen: nitrogen = 1: 9, volume ratio) At 350 DEG C for 1 hour to prepare a palladium catalyst for the production of hydrogen peroxide in which palladium and an alkali metal sodium were supported at a weight ratio of about 1: 1 on a titania carrier according to the present invention.

Comparative Example  One

Palladium without sodium nitrite was added nitrate hydrate _{(Pd (NO 3) * xH} 2 O, Sigma-Aldrich) 0.0433 g of this in which the palladium on titania carrier according to the same procedure as in Example 1, except that dissolved in DI water 0.67 wt% supported hydrogen peroxide.

Comparative Example  2

Except that 0.0433 g of palladium nitrate hydrate (Pd (NO ₃ ) * xH ₂ O, Sigma-Aldrich) and 0.0185 g of sodium nitrate (NaNO ₃ , Sigma-Aldrich) were simultaneously dissolved in DI water. A palladium catalyst for the production of hydrogen peroxide was prepared by carrying out the same method in which palladium and sodium salt of an alkali metal were supported on a titania carrier at a weight ratio of about 1: 0.5.

Comparative Example  3

Except that 0.0433 g of palladium nitrate hydrate (Pd (NO ₃ ) * xH ₂ O, Sigma-Aldrich) and 0.0739 g of sodium nitrate (NaNO ₃ , Sigma-Aldrich) were simultaneously dissolved in DI water. Palladium catalyst for the preparation of hydrogen peroxide in which palladium and sodium alkali metal are supported on a titania carrier at a weight ratio of about 1: 3.2 was prepared according to the same method.

Comparative Example  4

Palladium nitrate hydrate _{(Pd (NO 3) * xH} 2 O, Sigma-Aldrich) 0.0433 g and sodium nitrate as in the Example 1 except for at the same time dissolving the _{(NaNO 3, Sigma-Aldrich)} 0.1479 g in DI water A palladium catalyst for the production of hydrogen peroxide was prepared by carrying out the same method in which palladium and sodium alkali metal were supported on a titania carrier at a weight ratio of about 1: 6.5.

Comparative Example  5

A catalyst for the production of hydrogen peroxide was prepared in the same manner as in Example 1 except that 0.1479 g of sodium nitrate (NaNO ₃ , Sigma-Aldrich) was dissolved in DI water without addition of palladium nitrate hydrate.

Experimental Example  One. Inductively coupled plasma  Spectrometer (ICP- OES ) And carbon monoxide chemical adsorption (CO- Chemisorption ) To measure the area of exposed Pd

The contents of palladium and sodium of the catalyst according to Example 1 and Comparative Examples 1 to 4 were measured through ICP-OES analysis, and the results are shown in Table 1 below.

Also, the areas of Pd and Na in the catalyst according to Example 1 and Comparative Examples 1 to 4 were measured through CO-Chemisorption analysis, and the results are shown in Table 1 below.

Specifically, since the hydrogen peroxide synthesis reaction occurs on the exposed palladium surface, the result of the hydrogen peroxide synthesis reaction may vary depending on the exposed palladium area. Since the present invention was used for the reaction with the same palladium weight when using the above catalysts, the exposed area of palladium was expressed as the exposed area per 1 g of palladium (m ² / g _Pd ).

As shown in the following Table 1, when the catalysts of Comparative Examples 1 to 4 were compared with each other, the palladium surface area and the degree of dispersion of the catalyst according to the present invention were observed to be 3-4 times or more. This is because, when sodium is added, sodium transfers electrons to palladium, so that the particle size of palladium becomes small and uniform at a certain sodium concentration, and the degree of dispersion increases. The oxygen vacancy of the titania carrier is attributed to the fact that it provides a space in which the crystal nuclei can be present and at the same time has strong binding characteristics.

It was confirmed that when the catalyst production method according to the present invention was applied to a titania carrier, the dispersion degree of palladium was 3-4 times as large as that of the catalysts prepared according to Comparative Examples 1 to 4.

division Pd loading
(wt.%) Na loading
(wt.%) Pd surface area (m ² / g _Pd ) Pd dispersion (%) Example 1 0.66 0.67 86.3 19.4 Comparative Example 1 0.67 - 24.3 5.4 Comparative Example 2 0.71 0.36 20.2 5.3 Comparative Example 3 0.65 2.06 32.8 7.3 Comparative Example 4 0.65 4.23 56.2 12.6

Experimental Example  2. Scanning Transmission Electron Microscope (SEM)

The catalysts according to Examples and Comparative Examples 1 to 4 were observed with a scanning transmission electron microscope (STEM) and are shown in Fig. From these results, it was confirmed that the particle size of the catalyst having a larger palladium dispersion degree was smaller.

Experimental Example  3. X-ray Photoelectron Spectroscopy

The catalysts according to Examples and Comparative Examples 1 to 4 were analyzed by X-ray photoelectron spectroscopy. The analysis is to confirm the electron exchange phenomenon between palladium and sodium after the preparation of the catalyst. FIG. 2 shows the electron state of palladium, and FIG. 3 shows the electron state of sodium.

FIG. 2 shows that the palladium catalyst added with sodium exhibited low binding energy except for Comparative Example 2 in which sodium was added in a very small amount. The binding energy (eV), which is the X-axis, shows that the lower the value of palladium is, the more abundant the electrons. This result is due to the fact that sodium, the electron donor, gives electrons to palladium. The higher the amount of addition, the lower the binding energy and the more positive the negative charge of palladium. In the case of Comparative Example 2, since the content of sodium supported is very small, it is difficult to efficiently provide palladium with electrons, and since it provides only some electrons to the titania, State.

FIG. 3 shows the electronic state of sodium. Since sodium acts as an electron donor for providing electrons, it tends to be biased with higher binding energy as the amount of sodium supported increases. However, in the case of the catalyst according to Comparative Example 4, It was confirmed that the same electron state as that of the catalyst according to Comparative Example 5 in which only pure sodium was impregnated was observed. This is because the surface of the catalyst is similar in surface property to the catalyst in which only sodium is added since the sodium is excessively added to the surface of the catalyst.

From these X-ray photoelectron spectroscopic results, it was confirmed that electron transport phenomena of palladium and sodium occurred in the titania carrier by adding sodium, which is an alkali metal, according to the present invention.

Experimental Example  4. Manufacture of hydrogen peroxide

Examples and Comparative Examples 1-4 the catalyst of the reaction solvent to the at 350 ℃ reduction for one hour double jacket reactor of the (ultra pure water, 120 mL; ethanol (ethanol) 30 mL; and phosphoric acid (H ₃ PO ₄₎ 0.03 M , KBr 0.15 mM) and palladium (0.2 g) were added, and the reaction was carried out for 3 hours. The reaction temperature was maintained at 20 ° C and the pressure was maintained at 1 atm. The reaction gas (H ₂ / O ₂ = 1/10) was flowed constantly at 22 mL per minute. The hydrogen peroxide produced after the reaction was collected.

The concentration of collected hydrogen peroxide was measured by the following equation (1) using the iodometric titration method, and the hydrogen conversion was calculated by the following equation (2), and the produced hydrogen peroxide yield was calculated by the following equation (3): hydrogen peroxide The selectivity was calculated by the following equation (4). The hydrogen peroxide production rate was calculated by the following equation (5). The results of the direct hydrogen peroxide production reaction are shown in FIGS.

[Equation 1]

&Quot; (2) "

&Quot; (3) "

&Quot; (4) "

&Quot; (5) "

As shown in FIG. 4, when the catalyst according to the embodiment of the present invention was used, it was confirmed that the conversion of hydrogen according to Comparative Examples 1 to 4 was 1.5-2 times higher than that of the catalyst. This is because the palladium surface area of the catalyst according to the embodiment of the present invention is twice or more as described above. When the selectivity of the hydrogen peroxide in FIG. 4 was compared, the catalyst selectivities according to the examples were somewhat lower than those of the catalysts according to Comparative Examples 1 and 2, and the selectivities of Comparative Example 3 were comparative examples 1, Was measured even lower than the example. These results show that palladium rich in electron states causes lower hydrogen peroxide selectivity. In the case of the catalyst according to Comparative Example 4, it was confirmed that the activity of the catalyst was very low because excess sodium blocked the surface of palladium, which is an active metal, and hydrogen conversion and hydrogen peroxide yield were much lower. As a result, it was confirmed that the hydrogen peroxide selectivity of the catalyst according to the present invention was slightly lower than that of the catalysts of Comparative Examples 1 and 2, but showed the highest hydrogen peroxide yield and hydrogen peroxide production rate on the basis of much higher hydrogen conversion (Fig. 5).

Claims (15)

(a) baking titania at a temperature of 200 to 950 캜 to produce a titania carrier;
(b) mixing the palladium precursor and the alkali metal precursor into a solvent;
(c) supporting the mixture on the titania carrier;
(d) drying and calcining the supported mixture; And
(e) reducing the calcined mixture,
Wherein the titania carrier is supported on palladium and alkali metal at a weight ratio of 1: 0.8-2. The method according to claim 1,
Wherein the calcination in step (a) is performed for 2 to 12 hours. The method according to claim 1,
Wherein the alkali metal precursor is selected from the group consisting of metal chlorides, metal nitrides and metal hydroxides. delete The method according to claim 1,
Wherein the mixture is supported at 0.1 to 20 wt% based on the total weight of the titania carrier in the step (c). The method according to claim 1,
Wherein the catalyst is dried at a temperature of 50 to 200 ° C for 12 to 24 hours in the step (d), and then calcined at a temperature of 400 to 600 ° C for 2 to 8 hours. The method according to claim 1,
Wherein the reduction in step (e) is performed at a temperature of 150 to 500 ° C for 1 to 8 hours. Titania carrier; And
And a mixture of palladium and an alkali metal supported on the titania carrier,
Wherein the palladium and the alkali metal are mixed at a weight ratio of 1: 0.8-2. A process for producing hydrogen peroxide comprising the steps of: reacting and reacting hydrogen and oxygen as reactants in a reactor comprising a palladium catalyst for producing hydrogen peroxide according to claim 8 and a solvent. 10. The method of claim 9,
Wherein the solvent is at least one solvent selected from the group consisting of methanol, ethanol and water. 11. The method of claim 10,
Wherein the solvent further comprises at least one halogen compound selected from the group consisting of chlorine, bromine and iodine. 11. The method of claim 10,
Wherein the solvent further comprises one diacid acid selected from the group consisting of sulfuric acid, hydrochloric acid, phosphoric acid and nitric acid. 10. The method of claim 9,
Wherein the hydrogen and oxygen molar ratio is 1: 5 to 1:15. 10. The method of claim 9,
Wherein the reactor is further supplied with nitrogen to cause the reaction to proceed. 10. The method of claim 9,
Wherein the reaction is carried out at a pressure of 1 to 40 atm and at a temperature of 10 to 30 < 0 > C.

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