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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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A Dual-Functional Electroactive Filter Towards Simultaneously Sb(III) Oxidation and Sequestration
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Simultaneous removing SO2 and NO by a new system containing cobalt complex.

Chun-Qiong Zhou1, Xian-He Deng, Zhao-Qun Pan

  • 1School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 510640, China. huagongzhoucq@163.com

Journal of Environmental Sciences (China)
|February 14, 2007
PubMed
Summary

A new catalyst system using cobalt(III) ethylenediamine (Co(en)3(3+)) and urea effectively removes both nitric oxide (NO) and sulfur dioxide (SO2) from flue gas. This method prevents catalyst precipitation, ensuring high removal efficiency.

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Area of Science:

  • Environmental Chemistry
  • Catalysis
  • Industrial Emissions Control

Background:

  • Cobalt(III) ethylenediamine complexes catalyze nitric oxide (NO) absorption and oxidation.
  • Simultaneous SO2 and NO absorption leads to cobalt sulfite precipitation, reducing NO removal efficiency.
  • A novel approach is needed to mitigate precipitation and enhance simultaneous NO and SO2 removal.

Purpose of the Study:

  • To develop a new catalyst system for simultaneous removal of NO and SO2 from flue gas.
  • To address the precipitation issue associated with cobalt(III) ethylenediamine catalysts.
  • To optimize conditions for high NO and SO2 removal efficiency.

Main Methods:

  • Utilized a catalyst system comprising cobalt(III) ethylenediamine (Co(en)3(3+)) and urea.
  • Employed dissolved oxygen in the scrubbing solution as the oxidant.
  • Investigated the effect of urea in oxidizing sulfite (SO3(2-)) to sulfate (SO4(2-)), preventing Co2(SO3)3 precipitation.
  • Analyzed the influence of gas flow rate, catalyst and urea concentrations, temperature, and oxygen content on NO removal.

Main Results:

  • The Co(en)3(3+)-urea system effectively removes both NO and SO2.
  • Urea addition successfully oxidized SO3(2-) to SO4(2-), preventing catalyst precipitation.
  • High NO and SO2 removal rates were achieved.
  • Optimal conditions included 0.02 mol/L Co(en)3(3+), 1% urea, 50°C, and 10% O2 in flue gas, maintaining over 95% NO removal at low gas flow rates.

Conclusions:

  • The Co(en)3(3+)-urea catalyst system offers an effective solution for simultaneous NO and SO2 removal from industrial flue gas.
  • This method overcomes the precipitation limitations of previous cobalt-based catalysts.
  • The system demonstrates high efficiency and is influenced by several operational parameters, allowing for optimization.