Preparation method of modified bio-charcoal based catalyst

A biochar and catalyst technology, which is applied in the field of preparation of modified biochar-based catalysts, can solve problems such as unreported process methods, and achieve the effects of simple operation, high removal efficiency and good removal effect.

Inactive Publication Date: 2015-07-15
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology provides an effective way to remove harmful substances from exhaust streams by utilizing biomass or metals that have been treated with certain agents beforehand. These processes involve reacting them under specific conditions such as low temperatures and strong acidic solutions. By removing these reagents, valuable resources like nitrogen (N) and oxygen (O2) may be recovered while minimising environmental impacts associated therewith. Additionally, this technique allows for efficient recovery of useful components including organosulfanes, thiocyanates, polysacchangers, aminopyridines, quaternary salts, etc., which could help improve air quality standards and reduce health hazards caused by volatile compounds released into our environment.

Problems solved by technology

Technologies described include methods for efficiently decombing volatile compounds containing chlorine or fluoroformyl nitrosothiocyanate (HCNS). These techniques involve converting these molecules into more stable forms like hydrocrackable liquid products called solvates. However, there exist other ways to break down them while reducing environmental impact caused by certain types of halogens including bromochloroarsene (BCL2) and hexavalenceodium monosulfanadionte(HDMA)). Additionally, some technical means involving combining different processes together may help reduce emissions and improve treatment outcomes.

Method used

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  • Preparation method of modified bio-charcoal based catalyst
  • Preparation method of modified bio-charcoal based catalyst
  • Preparation method of modified bio-charcoal based catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Example 1: Carbonize the tobacco rod under the protection of nitrogen in a tube furnace at 600°C for 1 hour, then mix the carbonized material and KOH evenly in a mass ratio of 1:1, and then carbonize the rod in a tube furnace at 600°C under the protection of nitrogen Activate for 2 hours, take out the activated material and wash with distilled water until the pH is neutral, dry at 120°C for 4 hours to obtain biochar, grind and sieve the biochar into 40-60 mesh, then wash 4 times with water until the supernatant is free of turbidity Suspend and dry in a blast drying oven at 100°C for 7 hours; boil the dried biochar in a KOH solution with a concentration of 1mol / L for 1.5 hours, then wash with distilled water until the pH is neutral, and filter it at 100 Dry in a blast drying oven at ℃ for 7 hours; add the dried biochar to a metal salt solution with a mass percentage concentration of 15% (ferric nitrate 40%, ferrous sulfate 15%, aluminum sulfate 45% and mix to prepare an aq...

Embodiment 2

[0032] Example 2 ： The peanut shells were carbonized in a tube furnace at 700°C under the protection of nitrogen for 2 hours, then the carbonized material and KOH were mixed evenly in a mass ratio of 1:2, and activated in a tube furnace at 700°C under the protection of nitrogen for 1 hour. Take out the activated material and wash it with distilled water until the pH is neutral, dry at 110°C for 5 hours to obtain biochar, grind the biochar and sieve it into 40-60 mesh, then wash it with water for 5 times until the supernatant has no turbid suspension, and dry it at 130°C Dry in a blast drying oven at ℃ for 6 hours; boil the dried biochar in a KOH solution with a concentration of 0.9mol / L for 2.0 hours, then wash with distilled water until the pH is constant, filter and place in a blast at 130°C Dry in a drying oven for 6 hours; add the dried biochar to a solution of metal salts (45% ferric nitrate, 20% ferrous sulfate, and 35% aluminum sulfate to prepare an aqueous solution) w...

Embodiment 3

[0034] Example 3 ： Coconut shells were carbonized in a tube furnace at 500°C under the protection of nitrogen for 2 hours, and then the carbonized material and KOH were mixed evenly in a mass ratio of 1:3, and activated under the protection of nitrogen in a tube furnace at 600°C for 1 hour. The activated material was taken out and washed with distilled water until the pH was neutral, and dried at 130°C for 7 hours to obtain biochar. The biochar was ground and sieved into 40-60 meshes, then washed 6 times with water until the supernatant was free of turbidity suspended, and dried at 110°C. Dry in a blast drying oven at ℃ for 4 hours; boil the dried biochar in a KOH solution with a concentration of 1.1mol / L for 2.0 hours, then wash with distilled water until the pH is constant, filter and place in a blast at 110°C Dry in a drying oven for 4 hours; add the dried biochar to a metal salt (45% ferric nitrate, 15% ferrous sulfate, and 40% aluminum sulfate to prepare an aqueous soluti...

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Abstract

The invention discloses a preparation method of a modified bio-charcoal based catalyst, which can remove carbonyl sulfide, carbon disulfide, and hydrogen cyanide at the same time. The bio-charcoal is taken as the carrier, a series of modifications is carried out to prepare the catalyst, the catalyst is applied to catalytic hydrolysis so as to simultaneously remove COS, CS2, and HCN; the work temperature of the catalyst is not higher than 100 DEG C, the removal rates of COS and CS2 are not less than 90%, the removal rate of HCN is not less than 70%; and the bio-charcoal based catalyst is prepared by the following steps: subjecting waste biomass to carbonization and activation in sequence so as to obtain the bio-charcoal carrier, then boiling the bio-charcoal carrier in a KOH solution, adding the bio-charcoal carrier in a metal salt solution to carry out ultrasonic impregnation, then burning the bio-charcoal carrier at a certain temperature; adding the burned bio-charcoal carrier into an alkaline solution to carry out ultrasonic impregnation, and finally drying to obtain the bio-charcoal based catalyst. The technology is concise, the operation is convenient, the operation is continuous, COS, CS2 and HCN in flue gas are removed and converted into valuable resources, and no secondary pollution is generated.

Description

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Claims

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Application Information

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Owner KUNMING UNIV OF SCI & TECH
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