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Catalyst for catalyzing isocyanic acid produced in urea pyrolysis process to hydrolyze so as to generate ammonia and preparation method thereof

A catalyst and isocyanic acid technology, applied in the direction of physical/chemical process catalysts, ammonia preparation/separation, molecular sieve catalysts, etc., can solve the problems of catalysts with small specific surface area, high temperature deactivation, unfavorable, etc., to achieve favorable catalytic reactions, Stable performance and cost saving effect

Active Publication Date: 2014-05-07
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, HNCO can undergo reduction reaction with NO to produce harmful nitrous oxide (N 2 O), which is detrimental to the denitrification process
[0007] Currently, the hydrolysis of NH for HCNO 3 , a corresponding catalyst has been developed, which is mainly composed of anatase-type titanium dioxide TiO 2 However, the specific surface of the catalyst is small, and there is a high temperature deactivation phenomenon (highly active anatase TiO 2 Crystal phase transition to low activity rutile TiO 2 )

Method used

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  • Catalyst for catalyzing isocyanic acid produced in urea pyrolysis process to hydrolyze so as to generate ammonia and preparation method thereof
  • Catalyst for catalyzing isocyanic acid produced in urea pyrolysis process to hydrolyze so as to generate ammonia and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] Example 1: Fe / TiO 2 / ZSM-5 catalyst (catalyst A)

[0040] In order to prepare 50g of catalyst A, ZSM-5 molecular sieve (provided by Shandong Qilu Huaxin High-Tech Co., Ltd.) was vacuum-dried in a vacuum oven at 60°C for 4 hours, cooled to room temperature, and set aside; 1ml of pure titanium tetrachloride solution ( Main agent TiO 2 Precursor) was added dropwise into 450ml dispersion liquid (48.5g ZSM-5 molecular sieve dispersed in 450ml deionized water), stirred in a water bath at 70°C, the hydrolysis time was 45min, and the pH was controlled at 1.0. Rinse with water until the pH value is about 7.0, then put the molecular sieve loaded with the main agent into a muffle furnace for calcination to 300°C, keep it warm for 5 minutes, cool to room temperature, and set aside; Immerse in 50ml ferric nitrate solution (Fe precursor, containing 0.5g iron) for 12 hours at room temperature, vacuum dry at 60°C for 4 hours in a vacuum oven, then bake at 300°C in a muffle furnace fo...

Embodiment 2

[0044] Example 2: Pt / TiO 2 / ZSM-5 catalyst (catalyst B)

[0045] In order to prepare 50g of catalyst B, ZSM-5 molecular sieve (provided by Shandong Qilu Huaxin High-Tech Co., Ltd.) was dried in a constant temperature drying oven at 100°C for 8 hours, cooled to room temperature, and set aside; 1.5ml was pure titanium tetrachloride solution (mainly TiO 2 Precursor) was added dropwise into 450ml dispersion liquid (48.5g ZSM-5 molecular sieve dispersed in 450ml deionized water), stirred in 80°C water bath, hydrolysis time was 60min, pH was controlled at 3.0, after the dropwise addition, filtered, and repeatedly deionized Rinse with water until the pH value is about 7.0, then put the molecular sieve loaded with the main agent into a muffle furnace for calcination to 450°C, keep it warm for 5 minutes, cool to room temperature, and set aside; Immerse in 50ml of chloroplatinic acid solution (Pt precursor, containing platinum 0.005g) for 16 hours at room temperature, dry in a constan...

Embodiment 3

[0047] Embodiment 3: Fe-Pt / TiO 2 / ZSM-5 catalyst (catalyst C)

[0048] In order to prepare 50g of catalyst C, ZSM-5 molecular sieve (provided by Shandong Qilu Huaxin High-Tech Co., Ltd.) was vacuum-dried in a vacuum oven at 70°C for 4 hours, cooled to room temperature, and set aside; Ti(OC 4 h 9 ) 4 load, the 10.625gTi(OC 4 h 9 ) 4 Dissolve in ethanol, add acetic acid while stirring, add ethanol containing deionized water and stir, add nitric acid dropwise to make the pH value 4, impregnate 48.5g molecular sieves in the obtained sol for 30min and pull it up. Then put the molecular sieve loaded with the main agent into a muffle furnace and calcined to 400 ° C, keep it warm for 5 minutes, cool to room temperature, and set aside; use the equal volume impregnation method to impregnate the molecular sieve loaded with the main agent step by step at room temperature according to volume, Immerse in the mixed solution of 50ml ferric nitrate (Fe precursor, containing iron 0.5g) an...

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Abstract

The invention discloses a catalyst for catalyzing isocyanic acid produced in a urea pyrolysis process to hydrolyze so as to generate ammonia and a preparation method of the catalyst. The catalyst is composed of a carrier, and an active component host and a doping component adjuvant which are loaded on the carrier. The carrier is a ZSM-5 molecular sieve, the active component host is titanium dioxide, and the doping component adjuvant is iron, platinum, or a mixture of iron and platinum. The catalyst provided by the invention is larger in specific surface area, more stable in performance at high temperature and higher in catalytic activity.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a catalyst for catalyzing the hydrolysis of isocyanic acid produced in the pyrolysis process of urea into ammonia and a preparation method thereof. Background technique [0002] At present, the commonly used reducing agents in the flue gas denitrification system are ammonia, liquid ammonia and urea. These reducing agents are used in the flue gas denitrification technology to achieve similar denitrification effects. Urea is non-toxic, harmless, non-explosive, and easy to transport and store. Based on the above safety considerations, it has been more widely used as a reducing agent in recent years. In the Selective Catalytic Reduction (SCR) denitrification system, urea generally cannot be directly injected into the catalytic reactor, but a separate urea ammonia production system needs to be configured outside the reactor. [0003] Ammonia production from urea include...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46C01C1/02
CPCY02P20/52
Inventor 莫建松寿冬金王岳军王根虞廷兴陈泉张仲飞李世远
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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