Composite catalyst filter tube for denitration and catalytic removal of VOCs in wide temperature range

Abstract

The utility model discloses a composite catalyst filter tube for denitration and catalytic removal of VOCs (Volatile Organic Compounds) in a wide temperature range, which comprises a ferromanganese catalyst layer, a vanadium-titanium catalyst layer and a noble metal catalytic oxidation layer which are sequentially arranged along a waste gas transmission direction, and the ferromanganese catalyst layer can perform denitration treatment on waste gas within a temperature range of 100-300 DEG C; the vanadium-titanium catalyst layer can play a denitration role in an environment of 250-500 DEG C; the precious metal catalytic oxidation layer can assist the denitration reaction of the medium-high temperature section and can also catalyze and remove VOCs in the waste gas. The filter tube can be used for efficiently denitrating waste gas within the range of 100-500 DEG C, and can also be used for catalytically removing VOCs (Volatile Organic Compounds) at the same time.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, specifically a composite catalyst filter tube for wide-temperature-range denitrification and catalytic removal of VOCs. Background Technology

[0002] Traditional denitrification catalyst filters typically use a single catalyst, which only functions within a specific temperature range, such as low-temperature catalysis (100-300 degrees Celsius) or medium-temperature catalysis (250-500 degrees Celsius). For exhaust gases with significant temperature fluctuations, single-catalyst filters cannot meet the demands for efficient denitrification across the entire temperature range. Furthermore, traditional filters cannot simultaneously remove VOCs from the exhaust gas.

[0003] In the prior art, for example:

[0004] CN115025772A discloses a supported vanadium-titanium synergistic denitrification and mercury removal catalyst and its preparation method. This catalyst utilizes a modified impregnation method to uniformly load Mn₂O₃ onto a commercial SCR catalyst. The excellent catalytic oxidation properties of nanoscale Mn₂O₃ convert part of the NO in flue gas into NO₂ to improve denitrification efficiency and significantly broaden the reaction temperature window. However, this catalyst cannot simultaneously remove VOCs.

[0005] CN115282752A discloses a low-temperature flue gas NOx and VOCs synergistic removal method using pre-oxidation conditioning coupled with catalysis. This method employs a pre-oxidant to partially oxidize NO to NO2, coupling pre-oxidation conditioning with catalysis. On one hand, this triggers an enhanced SCR reaction to improve low-temperature denitrification efficiency; on the other hand, NO2 partially or completely replaces the role of O2, increasing the conversion rate of the VOCs catalytic oxidation reaction, thereby broadening the reaction temperature window for the synergistic removal of both pollutants. However, this method requires an additional pre-oxidant, making the operation relatively complex. Utility Model Content

[0006] The purpose of this invention is to provide a composite catalyst filter tube for wide-temperature-range denitrification and catalytic removal of VOCs, so as to solve one or more of the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model discloses a composite catalyst filter tube for wide-temperature-range denitrification and catalytic removal of VOCs, comprising a manganese-iron catalyst layer, a vanadium-titanium catalyst layer, and a precious metal catalytic oxidation layer arranged sequentially along the waste gas transmission direction. In this design, the manganese-iron catalyst layer can denitrify the waste gas within a temperature range of 100-300℃; the vanadium-titanium catalyst layer can perform denitrification at an environment of 250-500℃; and the inner precious metal catalytic oxidation layer can catalytically remove VOCs from the waste gas at temperatures ranging from 150 to 500℃.

[0008] In some embodiments, the manganese-iron catalyst layer, the vanadium-titanium catalyst layer, and the noble metal catalytic oxidation layer are arranged sequentially from the outside to the inside.

[0009] In some embodiments, the manganese-iron catalyst layer is filled with a manganese-iron catalyst, which includes a manganese-iron metal oxide, wherein the weight ratio of manganese to iron in the manganese-iron metal oxide is 1:1 to 0.1.

[0010] In some embodiments, the thickness S3 of the manganese-iron catalyst layer is 8–15 mm.

[0011] In some embodiments, the vanadium-titanium catalyst layer is filled with a vanadium-titanium catalyst, which includes vanadium pentoxide and titanium dioxide, and the weight ratio of vanadium pentoxide to titanium dioxide in the vanadium-titanium catalyst is 1:1.5 to 2.

[0012] In some embodiments, the thickness S2 of the vanadium-titanium catalyst layer is 8–15 mm.

[0013] In some embodiments, the noble metal catalytic oxidation layer is filled with a noble metal catalyst, including nano-platinum and palladium, and the loading of the noble metal catalytic oxidation layer is 0.1 to 10 g of noble metal per square meter.

[0014] In some embodiments, the thickness S1 of the noble metal catalytic oxide layer is 4 to 10 mm.

[0015] Compared with the existing technology, the beneficial effects of this utility model are: by adopting a three-layer structure design, it achieves efficient denitrification in a wide temperature range of 100-500℃, and can simultaneously remove VOCs contained in the exhaust gas, which greatly improves the efficiency and treatment effect of exhaust gas treatment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the mechanism of the composite catalyst filter tube for wide-temperature-range denitrification and catalytic removal of VOCs in some embodiments of this utility model. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Figure 1 The direction indicated by the middle arrow is the airflow direction.

[0019] Please see Figure 1The figure shows a preferred embodiment of the present invention, which discloses a composite catalyst filter tube for wide-temperature-range denitrification and catalytic removal of VOCs, including a manganese-iron catalyst layer 103, a vanadium-titanium catalyst layer 102 and a noble metal catalytic oxidation layer 101 arranged sequentially from the outside to the inside along the exhaust gas transmission direction.

[0020] The manganese-iron catalyst used in the aforementioned manganese-iron catalyst layer 103 may include manganese-iron metal oxide, wherein the weight ratio of manganese to iron is 1:1 to 0.1.

[0021] In some specific implementations, the thickness S3 of the manganese-iron catalyst layer 103 is 8–15 mm.

[0022] The vanadium-titanium catalyst layer 102 mentioned above can directly use a vanadium-titanium catalyst, which may include vanadium pentoxide and titanium dioxide, and the weight ratio of vanadium pentoxide to titanium dioxide in the vanadium-titanium catalyst is 1:1.5 to 2.

[0023] In some specific implementations, the thickness S2 of the vanadium-titanium catalyst layer 102 is 8–15 mm.

[0024] The noble metal catalyst used in the above-mentioned noble metal catalytic oxide layer 101 may include nano-platinum and palladium, and the loading of the noble metal catalytic oxide layer 101 is 0.1 to 10 g of noble metal per square meter.

[0025] In some specific implementations, the thickness S1 of the noble metal catalytic oxide layer 101 is 4 to 10 mm.

[0026] In application, when exhaust gas enters the filter tube at a low temperature (100-300℃), the manganese-iron catalytic layer first performs preliminary denitrification treatment on the nitrogen oxides in the exhaust gas. As the exhaust gas flows through the filter tube, if the temperature rises to 250-500℃, the medium-temperature vanadium-titanium catalytic layer continues the denitrification reaction, further reducing the nitrogen oxide content. Simultaneously, the precious metal catalytic oxidation layer works synergistically throughout the entire temperature range to catalytically oxidize and decompose VOCs in the exhaust gas, ultimately achieving the goal of wide-temperature-range, high-efficiency denitrification and VOCs removal.

[0027] All of the above-mentioned undisclosed matters can be implemented using existing technologies, so they will not be elaborated here.

[0028] Finally, it should be noted that in the description of this utility model, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A composite catalyst filter tube for wide-temperature-range denitrification and catalytic removal of VOCs, characterized in that, The device comprises a manganese-iron catalyst layer, a vanadium-titanium catalyst layer, and a noble metal catalytic oxidation layer arranged sequentially along the exhaust gas transmission direction. These layers are arranged from the outside in. The manganese-iron catalyst layer is filled with a manganese-iron catalyst, which includes manganese-iron metal oxide. The thickness S3 of the manganese-iron catalyst layer is 8-15 mm. The vanadium-titanium catalyst layer is filled with a vanadium-titanium catalyst, which includes vanadium pentoxide and titanium dioxide. The thickness S2 of the vanadium-titanium catalyst layer is 8-15 mm. The noble metal catalytic oxidation layer is filled with a noble metal catalyst, which includes nano-platinum and palladium. The loading of the noble metal catalytic oxidation layer is 0.1-10 g of noble metal per square meter. The thickness S1 of the noble metal catalytic oxidation layer is 4-10 mm.

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