Denitration, demercuration and dioxin removal catalyst and preparation method thereof

A technology for removing dioxins and catalysts, applied in molecular sieve catalysts, chemical instruments and methods, catalysts for physical/chemical processes, etc., can solve the problems of complex composition of flue gas pollutants, increasing operating costs, and increasing the difficulty of treatment, etc. Achieve the effect of increasing surface chemical adsorption oxygen capacity, improving sulfur resistance, and good hydrothermal stability

Active Publication Date: 2020-06-26
DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]my country's requirements for the treatment of atmospheric environmental pollutants are becoming more and more stringent, and the composition of smoke pollutants is complex, which increases the difficulty of treatment
At the same time, nitrogen oxides, mercury, and dioxins are independently treated in stages, which greatly increases operating costs

Method used

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  • Denitration, demercuration and dioxin removal catalyst and preparation method thereof
  • Denitration, demercuration and dioxin removal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take a certain amount of tetrabutyl titanate and dissolve it in absolute ethanol to make solution a, respectively weigh a certain amount of cerium nitrate, tin tetrachloride, and palladium nitrate and dissolve it in deionized water to make solution b. Slowly drop b into solution a, stir evenly, add acetic acid dropwise to adjust the pH to 3, and obtain solution c. Place solution c in a water bath at 60°C, and ultrasonicate at a frequency of 80kHz, while quickly mixing SAPO-46 powder into solution c. After 60 minutes, the ultrasound was turned off, and the gel was prepared by standing at 70°C for 120 minutes. The solution was quickly frozen in liquid nitrogen, and then quickly transferred to a freeze dryer for drying at a drying temperature of -40°C and a pressure of 25pa. After drying, it was calcined at 550°C for 3 hours and ground to 120nm to obtain a preliminary catalyst.

[0043] Weigh a certain amount of ammonium metavanadate, zirconium oxychloride, and cobalt ni...

Embodiment 2

[0047] Take a certain amount of tetrabutyl titanate and dissolve it in absolute ethanol to make solution a, respectively weigh a certain amount of cerium nitrate, tin tetrachloride, and palladium nitrate and dissolve it in deionized water to make solution b. Slowly drop b into solution a, stir evenly, add citric acid dropwise to adjust the pH to 5, and obtain solution c. Put the solution c in a water bath at 90°C, and sonicate at a frequency of 80kHz, and at the same time quickly mix the SAPO-46 powder into the solution c. After 60 minutes, turn off the ultrasound, and stand at 95°C for 30 minutes to obtain a gel. The solution was quickly frozen in liquid nitrogen, and then quickly transferred to a freeze dryer for drying at a drying temperature of -60°C and a pressure of 13pa. After drying, it was calcined at 550°C for 5 hours and ground to 80nm to obtain a preliminary catalyst.

[0048] Take by weighing a certain amount of ammonium metavanadate, zirconium oxychloride, coba...

Embodiment 3

[0052] Take a certain amount of tetraisooctyl titanate and dissolve it in absolute ethanol to make solution a, respectively take a certain amount of cerium nitrate, tin tetrachloride, and palladium nitrate and dissolve it in deionized water to make solution b. Solution b was slowly dropped into solution a, stirred evenly, and citric acid was added dropwise to adjust the pH to 3 to prepare solution c. Place solution c in a water bath at 70°C, and ultrasonicate at a frequency of 120kHz, while quickly mixing SAPO-46 powder into solution c. After 40 minutes, turn off the ultrasound, and stand at 72°C for 45 minutes to obtain a gel. The solution was quickly frozen in liquid nitrogen, and then quickly transferred to a freeze dryer for drying at a drying temperature of -50°C and a pressure of 20pa. After drying, it was calcined at 500°C for 3 hours and ground to 90nm to obtain a preliminary catalyst.

[0053] Weigh a certain amount of ammonium metavanadate, zirconium oxychloride, a...

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Abstract

The invention discloses a denitration, demercuration and dioxin removal catalyst and a preparation method thereof. According to the catalyst, a molecular sieve is adopted as a first carrier; titaniumdioxide is adopted as second carrier; cerium, tin and palladium are used as a first active component; vanadium, zirconium, neodymium and cobalt are used as second active components; two or more of molybdenum, yttrium, silver, lanthanum and nickel are used as cocatalysts; one or more of polyvinyl alcohol, carboxymethyl cellulose, liquid paraffin, ammonium polyacrylate, hydroxypropyl methyl cellulose or amino cellulose are used as forming auxiliaries; catalyst paste is prepared, and the flat plate type denitration catalyst is prepared through aging, coating, drying, shearing and calcining. The prepared catalyst has excellent denitration performance, mercury oxidation performance and dioxin removal performance at 180-400 DEG C, has good sulfur resistance and water resistance, and is suitablefor synergistic removal of coal-fired power plants, waste incineration power plants, steel sintering machines, glass kilns and the like.

Description

technical field [0001] The invention relates to a denitrification, mercury and dioxin removal catalyst and a preparation method thereof, belonging to the fields of environmental protection catalytic materials and air pollution control. Background technique [0002] Nitrogen oxides are one of the causes of pollutants such as smog, acid rain, and photochemical smog. Mercury is highly toxic, persistent, and bioaccumulative. It can enter the human body through breathing, skin contact, diet, and maternal and child genetics. It accumulates in the human body for a long time and causes muscle tremors, hyperthyroidism, encephalopathy, and necrotic bone disease. , acute renal failure and other diseases. Dioxin, also known as dioxin, is the abbreviation of dioxins, including chlorinated dibenzo-p-dioxins (PCDDs for short) and polychlorinated dibenzofurans (PCDFs for short), of which 2, 3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-tetrachlorodibenzo-p-dioxin, referred to as 2,3,7,8-TCDD...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85B01J35/10B01D53/86B01D53/56B01D53/72
CPCB01J29/85B01J35/1004B01D53/8668B01D53/8628B01D53/8665
Inventor 纵宇浩秦婷婷常峥峰黄力王虎张鑫李金珂
Owner DATANG NANJING ENVIRONMENTAL PROTECTION TECH
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