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Low-temperature SCR (Selective Catalytic Reduction) catalyst and preparation method thereof

An SCR catalyst and catalyst technology, applied in the field of denitration, can solve the problem that the carrier is difficult to load active components, and achieve the effect of improving the catalytic activity

Inactive Publication Date: 2018-12-07
沈炳龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the above-mentioned low-temperature SCR catalyst uses titanium dioxide which has good resistance to sulfur dioxide as a carrier, the specific surface area of ​​titanium dioxide itself is only 90-100m 2 / g, the pore volume is only about 0.2cm 3 / g, only using titanium dioxide as a carrier still has the problem that the carrier is difficult to load enough active ingredients

Method used

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  • Low-temperature SCR (Selective Catalytic Reduction) catalyst and preparation method thereof
  • Low-temperature SCR (Selective Catalytic Reduction) catalyst and preparation method thereof
  • Low-temperature SCR (Selective Catalytic Reduction) catalyst and preparation method thereof

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preparation example Construction

[0034] 1. MnO 2 Preparation of:

[0035] According to relevant information reports: Manganese oxide is a variable price oxide. There are four different preparation methods, and the properties of manganese oxide obtained by different methods and different pH values ​​are also different. We use the following method to synthesize manganese oxide:

[0036] The principle of the reaction is:

[0037]

[0038] Specific steps are as follows:

[0039] (1) Dissolve 15.8g potassium permanganate and 12.4g potassium hydroxide in 300ml deionized water, stir and dissolve, and record it as liquid A;

[0040] (2) 13g manganese sulfite is dissolved in 200ml deionized water to make liquid B;

[0041] (3) Slowly add liquid B to liquid A dropwise under the conditions of normal temperature, normal pressure and strong stirring;

[0042] (4) After the addition is completed, age for 30min, then filter and wash to the filtrate without sulfate ions (using BaCl 2 solution detection);

[0043] ...

Embodiment 1

[0054] A preparation method of a low-temperature SCR catalyst in this embodiment comprises the following steps:

[0055] (1) Weigh the prepared raw materials: 319g of manganese dioxide, 120g of silicon dioxide, 12g of presulfurized cerium oxide, 3.18g of niobium oxalate and 222.1g of titanium dioxide, put them into the kneader, and then add the formed Lubricant (stearic acid) 2.25g, release agent (glycerin) stearic acid 2.25g, defoamer (lactic acid) 0.3g, binder (hydroxymethylcellulose, CMC) 3.75g, polyethylene oxide (PEO) 3.75g and an appropriate amount of deionized water, and then fully kneaded until the hand feeling can be extruded into a strip of ∮ 3mm in the extruder (that is, the catalyst precursor);

[0056] (2) The catalyst precursor was first dried at 105°C, and then activated at 350°C. According to the indication of the differential thermal analyzer and the actual measurement, the drying time of the catalyst precursor at 105°C was 24 hours, and at 350°C The activati...

Embodiment 2

[0064] A preparation method of a low-temperature SCR catalyst in this embodiment comprises the following steps:

[0065] (1) Weigh the prepared raw materials: 319g of manganese dioxide, 216g of silicon dioxide, 12g of presulfurized cerium oxide, 3.18g of niobium oxalate and 192.8g of titanium dioxide, put them into the kneader, and then add the formed Lubricant (stearic acid) 2.25g, release agent (glycerin) stearic acid 2.25g, defoamer (lactic acid) 0.3g, binder (hydroxymethylcellulose, CMC) 3.75g, polyethylene oxide (PEO) 3.75g and an appropriate amount of deionized water, and then fully kneaded until the hand feeling can be extruded into a strip of ∮ 3mm in the extruder (that is, the catalyst precursor);

[0066] (2) The catalyst precursor was first dried at 105°C, and then activated at 350°C. According to the indication of the differential thermal analyzer and the actual measurement, the drying time of the catalyst precursor at 105°C was 24 hours, and at 350°C The activati...

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Abstract

The invention discloses a low-temperature SCR (Selective Catalytic Reduction) catalyst and a preparation method thereof. The catalyst comprises a carrier and active ingredients supported on the carrier, wherein the carrier is a complex of titania and silica, and the active ingredients include manganese oxide and cerium sesquioxide subjected to prevulcanization treatment. The silica is added into the titania, so that the specific surface area of the carrier reaches 160-170m<2> / g, the pore volume reaches 0.4cm<3> / g, the carrier can load more active ingredients after the specific surface area andpore volume are increased, and more catalytically active centers exist, so that the catalytic activity of the low-temperature SCR catalyst can be effectively improved. Moreover, due to the addition of the silica, the water resistance of the low-temperature SCR catalyst disclosed by the invention can be enhanced, and the low-temperature activity of the low-temperature SCR catalyst disclosed by theinvention is improved, so that the low-temperature SCR catalyst disclosed by the invention also has excellent denitration efficiency on flue gas containing 15% of water vapor under the low-temperature condition (100-120 DEG C).

Description

technical field [0001] The invention belongs to the technical field of denitrification, and in particular relates to a low-temperature SCR catalyst and a preparation method thereof. Background technique [0002] After years of research, Shell developed the Low Temperature DeNOx System (SDS) in the 1990s, comprising a proprietary V / Ti granular catalyst and a low pressure drop side stream reactor (LFR) . Typical commercial application grade SDS, the operating temperature is 120°C-350°C; the space velocity is 2500-40000 / h; it can achieve a NOx conversion rate higher than 95% with a small ammonia slip rate. The Austrian Ceram low-temperature denitrification technology also adopts the V-Ti system, in which the V content is between 0 and 3%, and the catalyst activity temperature is between 150 and 550 °C. Since 1990, Ceram has been engaged in low-temperature denitrification projects including waste-to-energy, ethylene cracking furnaces, nitric acid plants, natural gas gas turbin...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J27/04B01J37/20B01J35/10B01D53/86B01D53/56
CPCB01D53/8628B01J23/002B01J23/34B01J27/04B01J37/20B01J2523/00B01J35/615B01J35/633B01J2523/41B01J2523/47B01J2523/72
Inventor 沈炳龙沈雁军沈雁鳴沈雁来
Owner 沈炳龙
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