TWI573765B - Catalyst for removing hydrogen peroxide in water and its preparation method - Google Patents

Description

Catalyst for removing hydrogen peroxide in water and preparation method thereof

The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for removing hydrogen peroxide in water and a preparation method thereof.

In recent years, with the improvement of environmental awareness and the rigorous regulations, the recycling of industrial wastewater has also received attention. In order to reduce the pollution of water quality and corrosion of equipment by hydrogen peroxide, how to remove hydrogen peroxide from water is the main focus of its efforts. First, at present, most of the methods for removing hydrogen peroxide in wastewater are treated with activated carbon. However, the disadvantage of the activated carbon column bed is that it requires a large equipment volume, and the oxidation of hydrogen peroxide is easy to make the activated carbon powder in the tower bed. The activation of activated carbon powder may lead to an increase in equipment pressure drop, further affecting the inability to effectively control the operating parameters, resulting in a reduction in overall processing efficiency. Therefore, an effective medium is sought to replace the activated carbon tower bed to remove hydrogen peroxide in water. The direction of the effort.

It can be seen that the above-mentioned existing technology for removing hydrogen peroxide from wastewater has many defects, which is not a good design and needs to be improved.

The invention provides a catalyst for removing hydrogen peroxide in water, the structure of which is a porous carrier as its core, and a transition metal oxide layer is coated on the outer surface of the porous carrier.

The porous carrier is composed of one or more of cerium oxide, aluminum oxide, manganese oxide, zeolite, activated carbon and diatomaceous earth, and the specific gravity of the porous carrier is between 0.4 and 1.5 g/cm ³ . Further, the porous carrier has a specific surface area of more than 200 m ² /g. Wherein the transition metal oxide layer is coated on the surface of the porous carrier, the weight of which is 3~30% of the total weight of the catalyst, and the proportion of manganese oxide in the transition metal oxide layer accounts for 50-80%, and the proportion of titanium oxide accounts for 0~20%, the proportion of iron oxides is 0~20%, and the proportion of copper oxides is 0~20%.

The invention provides a preparation method of a catalyst for removing hydrogen peroxide in water, the steps are as follows: uniformly mixing a compound containing manganese, titanium, iron and copper and water to form a metal ion mixed solution; immersing a porous carrier in the metal ion In the mixed solution, let stand for at least 1 hour (22~24 hours is preferred) to form a catalyst precursor; air dry the catalyst precursor for at least 1 hour (20~24 hours is preferred), 100~600 °C (250~300 °C is preferred) Drying for at least 1 hour (6~8 hours is preferred), complete the metal ion oxidation and coating of the transition metal oxide layer to form a catalyst.

The method further comprises the steps of: preparing a porous carrier, the steps are as follows: mixing one or more of cerium oxide, aluminum oxide, manganese oxide, diatomaceous earth and zeolite, an adhesive and a granulating agent to form a plurality of The porous carrier precursor; and the carrier precursor is sintered at 600 to 1200 ° C (800 to 900 ° C is preferred) for at least one hour (5 to 6 hours is preferred) to form a porous carrier.

The detailed description of the preferred embodiments of the present invention is intended to be limited to the scope of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

In summary, this case is not only innovative in terms of space type, but also can enhance the above-mentioned multiple functions compared with the customary items. It should fully meet the statutory invention patent requirements of novelty and progressiveness, and apply for it according to law. This invention patent application, in order to invent invention, to the sense of virtue.

10‧‧‧ catalyst

11‧‧‧Porous carrier

12‧‧‧Transition metal oxide layer

S201~S203‧‧‧Step process

S301~S303‧‧‧Step procedure

S401~S402‧‧‧Step procedure

S501~S502‧‧‧Step procedure

Figure 1 is a schematic view showing the structure of a catalyst for removing hydrogen peroxide in water according to the present invention.

Fig. 2 is a flow chart showing the preparation method of the catalyst for removing hydrogen peroxide in water according to the present invention.

Figure 3 is a flow chart showing another preparation method of the catalyst for removing hydrogen peroxide in water according to the present invention.

Figure 4 is a flow chart showing the preparation method of the porous carrier of the present invention.

Figure 5 is a flow chart showing another method of preparing the porous carrier of the present invention.

Figure 6 is a graph showing the efficiency of the catalyst for removing hydrogen peroxide in water according to the present invention.

The technical features, contents, and advantages of the present invention, as well as the advantages thereof, can be understood by the reviewing committee, and the present invention will be described in detail with reference to the accompanying drawings. The subject matter is only for the purpose of illustration and description. It is not intended to be a true proportion and precise configuration after the implementation of the present invention. Therefore, the scope and configuration relationship of the attached drawings should not be interpreted or limited. First described.

Please refer to FIG. 1 , which is a schematic structural view of a catalyst for removing hydrogen peroxide in water according to the present invention, wherein the catalyst 10 has a porous carrier 11 as a core, and the outer surface of the porous carrier 11 is coated with a coating. Transition metal oxide layer 12, and transition metal oxide layer 12 The metal oxide is composed of manganese oxide, titanium oxide, iron oxide and copper oxide.

The porous carrier 11 is a combination of one or more of cerium oxide, aluminum oxide, manganese oxide, zeolite, activated carbon and diatomaceous earth, and the specific gravity of the porous carrier 11 is between 0.4 and 1.5 g/cm ³ . The porous carrier 11 has a specific surface area of more than 200 m ² /g. Wherein the weight ratio of the transition metal oxide layer 12 accounts for 3 to 30% of the total weight of the catalyst, and the proportion of manganese oxide in the transition metal oxide layer accounts for 50-80%, the proportion of titanium oxide accounts for 0-20%, and iron oxide The proportion of materials accounts for 0~20% and the proportion of copper oxide accounts for 0~20%.

2 is a flow chart of a method for preparing a catalyst for removing hydrogen peroxide in water according to the present invention. The steps are as follows: S201: uniformly mixing a compound containing manganese, titanium, iron, copper and water to form a metal ion mixed solution; S202 : immersing the porous carrier in the metal ion mixture and allowing to stand for at least 1 hour to form a catalyst precursor; S203: drying the catalyst precursor for at least 1 hour, drying at 100 to 600 ° C for at least 1 hour, The metal ion of the transition metal oxide layer is oxidized and coated to form a catalyst.

Please refer to FIG. 3 , which is a flow chart of another preparation method of the catalyst for removing hydrogen peroxide in water according to the present invention. The steps are as follows: S301: uniformly mixing a compound containing manganese, titanium, iron, copper and water to form a metal ion mixed solution. S302: immersing the porous carrier in the metal ion mixture, and standing for 22 to 24 hours to form a catalyst precursor; S303: the catalyst precursor is air-dried for 20 to 24 hours, and dried at 250 to 300 ° C; 6~8 hours, completed The metal ions of the transition metal oxide layer are oxidized and coated to form a catalyst.

Please refer to FIG. 4 , which is a flow chart of a method for preparing a porous carrier according to the present invention. The steps are as follows: S401: one or more of cerium oxide, aluminum oxide, manganese oxide, zeolite and diatomaceous earth, adhesive and preparation The granules are uniformly mixed to form a porous carrier precursor; and S402: the porous carrier precursor is sintered at 600 to 1200 ° C for at least one hour to form a porous carrier.

Please refer to FIG. 5 , which is a flow chart of another preparation method of the porous carrier of the present invention, and the steps are as follows: S501: one or more of cerium oxide, aluminum oxide, manganese oxide, zeolite and diatomaceous earth, and an adhesive. And the granulating agent is uniformly mixed to form a porous carrier precursor; and S502: the porous carrier precursor is sintered at 800 to 900 ° C for 5 to 6 hours to form a porous carrier.

Please refer to FIG. 6 , which is a graph showing the efficiency relationship of the catalyst for removing hydrogen peroxide in water according to the present invention. The efficiency of the catalyst of the present invention in a water having a hydrogen peroxide concentration of 500 mg/L and a residence time of 1.5 to 4 minutes is as shown in the catalyst. When the residence time is 1.5 minutes or more, the catalyst of the present invention has an efficiency of removing 80% to 98% of hydrogen peroxide in water compared with the same volume of activated carbon, which is more than twice the efficiency of the same volume of activated carbon to remove hydrogen peroxide in water, and The removal efficiency increases as the catalyst residence time increases. It can be seen that when the efficiency of removing hydrogen peroxide in water is the same, the required volume of the catalyst of the present invention is only 1/2 or less of that of activated carbon, and the catalyst of the present invention has better hydrogen peroxide removal efficiency. This not only solves the problem of traditional activated carbon powdering, but also reduces the time for wastewater treatment, reduces the overall time course, and saves space for a large activated carbon tower, which is a time-saving and energy-saving invention.

The detailed description of the present invention is intended to be illustrative of a preferred embodiment of the invention, and is not intended to limit the scope of the invention. The patent scope of this case.

To sum up, this case is not only innovative in terms of technical thinking, but also has many of the above-mentioned functions that are not in the traditional methods of the past. It has fully complied with the statutory invention patent requirements of novelty and progressiveness, and applied for it according to law. Approved this invention patent application, in order to invent invention, to the sense of virtue.

S201~S203‧‧‧Step process

Claims (8)

A catalyst for removing hydrogen peroxide in water is: a porous carrier; a transition metal oxide layer, wherein the transition metal oxide layer is coated on the surface of the carrier; wherein the weight ratio of the transition metal oxide layer accounts for the catalyst 3~30% of the total weight; and the proportion of manganese oxide in the transition metal oxide layer is 50-80%, the proportion of titanium oxide is 0-20%, the proportion of iron oxide is 0-20%, and the proportion of copper oxide Occupy 0~20%. The catalyst for removing hydrogen peroxide in water according to claim 1, wherein the porous carrier is one or a combination of two or more of cerium oxide, aluminum oxide, manganese oxide, zeolite, activated carbon and diatomaceous earth. The catalyst for removing hydrogen peroxide in water according to claim 2, wherein the porous carrier has a specific gravity of between 0.4 and 1.5 g/cm ³ and the porous carrier has a specific surface area of more than 200 m ² /g. A method for preparing a catalyst for removing hydrogen peroxide in water is as follows: uniformly mixing a compound containing manganese, titanium, iron or copper and water to form a metal ion mixed solution; immersing a porous carrier in the metal ion mixed solution , standing for a first time, forming a catalyst precursor; the catalyst precursor is dried for a second time, and dried at a first temperature for a third time to complete a transition metal oxide coating to form a touch Media. The method for preparing a catalyst for removing hydrogen peroxide in water according to claim 4, further comprising a method for preparing a porous carrier, the steps are as follows: cerium oxide, aluminum oxide, manganese oxide, zeolite and diatomaceous earth One or more, adhesives and The granulating agent is uniformly mixed to form a porous carrier precursor; the porous carrier precursor is sintered at a second temperature for a fourth time to form the porous carrier; and wherein the proportion of the transition metal oxide layer is 3 to 30% of the total weight of the catalyst, the proportion of manganese oxide in the transition metal oxide layer is 50-80%, the proportion of titanium oxide is 0-20%, the proportion of iron oxide is 0-20%, and the proportion of copper oxide Occupy 0~20%. The method for preparing a catalyst for removing hydrogen peroxide in water according to claim 4, wherein the first time is 1 hour or longer, the second time is 1 hour or longer, and the third time is 1 hour or longer. The four times are more than one hour, the first temperature is between 100 and 600 ° C, and the second temperature is between 600 and 1200 ° C. The method for preparing a catalyst for removing hydrogen peroxide in water according to claim 6 , wherein the first time is further 22 to 24 hours, the second time is further 20 to 24 hours, and the third time is further 6 ~8 hours, the fourth time is further 5 to 6 hours, the first temperature is further between 250 and 300 ° C, and the second temperature is further between 800 and 900 ° C. The method for preparing a catalyst for removing hydrogen peroxide in water according to the fourth aspect of the invention, wherein the porous carrier is one or more of cerium oxide, aluminum oxide, manganese oxide, zeolite, activated carbon and diatomaceous earth. The combination.