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Process for preparing high specific surface area chromium catalyst utilizing microbes

A high specific surface area, chromium catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as environmental pollution, emulsifier process complexity, large consumption, etc., to achieve obvious economic and The effect of environmental benefits

Inactive Publication Date: 2006-02-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to consume a large amount of emulsifier and the process is too complicated, resulting in very high catalyst preparation costs and environmental pollution.

Method used

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  • Process for preparing high specific surface area chromium catalyst utilizing microbes
  • Process for preparing high specific surface area chromium catalyst utilizing microbes
  • Process for preparing high specific surface area chromium catalyst utilizing microbes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1---Use the method of the present invention to prepare high specific surface area chromium catalyst

[0022] The specific steps are:

[0023] Configure 500ml containing sodium chromate (Cr 6+ Concentration 50mg / L), ferric sulfate (iron concentration 440mg / L), palladium chloride (palladium concentration 5mg / L), nickel sulfate (nickel concentration 30mg / L) and cerium nitrate (cerium concentration 25mg / L), and then inoculate The composite microbial bacterial liquid composed of SBR, Pseudomonas putida and Escherichia coli with a concentration of 0.5% by weight was cultivated at 35°C, pH 9 and dissolved oxygen 1mg / L for 24 hours until the mixed liquid turned blue, and then solid-liquid was carried out with a centrifuge. After separation, the obtained solid part was washed 5 times with deionized water, and calcined at 600° C. for 20 hours to obtain a high specific surface area chromium catalyst.

Embodiment 2

[0024] Embodiment 2---Using the method of the present invention to prepare high specific surface area chromium catalyst

[0025] The specific steps are:

[0026] Configure 500ml potassium chromate (Cr 6+ Concentration 2000mg / L), ferric sulfate (iron concentration 70mg / L), platinum chloride (platinum concentration 5mg / L), copper sulfate (copper concentration 5mg / L) and zirconium nitrate (zirconium concentration 20mg / L) solution, then Inoculate the composite microbial bacterial liquid composed of SBR, Pseudomonas putida and Escherichia coli with a concentration of 20% by weight, and cultivate it anaerobically at 80°C and pH7.5 for 40 hours until the mixed liquid turns blue, and then separate the solid and liquid with a centrifuge. The obtained solid part was washed with deionized water three times, and calcined at 1000° C. for 2 hours to obtain a chromium catalyst with a high specific surface area.

Embodiment 3

[0027] Embodiment 3 ----- use the method of the present invention to prepare high specific surface area chromium catalyst

[0028] The specific steps are:

[0029] Get electroplating waste water (hexavalent chromium concentration 500mg / L) that contains hexavalent chromium in an electroplating factory, and add potassium vanadate (vanadium concentration 20mg / L) and zirconium nitrate (zirconium concentration 20mg / L), then inoculate weight percent concentration to be 10% SBR, Pseudomonas putida and Escherichia coli compound microbial bacterial liquid, cultivated at 50°C, pH 5, dissolved oxygen 0.2mg / L for 20 hours until the mixture turned blue, and then separated the solid and liquid with a centrifuge, The obtained solid part was washed once with deionized water, and calcined at 500° C. for 10 hours to obtain a high specific surface area chromium catalyst.

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Abstract

The invention relates to preparation method for chrome catalyst with high special surface area by microbe and comprises steps as following: adding complex microbe liquid composed by SBR, Pseudomonas putida and Escherichia coli and heavy metal ion in chromate solution, reacting on the condition of pH value 5-9, temperature 10-80Deg, dissolved oxygen 0-1mg / L till the mixed solution becomes blue; taking centrifugal separation, clearing the obtained solid material with deionized water, putting into furnace for calcinations and obtaining the product. This method can be run under normal temperature and pressure with multiple-orifice complex product chromium sesquioxide particle of special surface area more than 50m2 / g, which has notable economical and environmental benefit.

Description

field of invention [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a high specific surface area chromium (porous chromium trioxide) catalyst by using microorganisms. Background technique [0002] Chromium-based catalysts are commonly used in oxidative dehydrogenation of low-carbon alkanes, fluorination of halocarbons, oxidation of halocarbons, synthesis of methanol, and carbon monoxide shift catalysis. In these reaction processes, the specific surface area and pore volume of the catalyst have a great influence on the activity of the catalyst. [0003] Traditional chromium-based catalysts use chromium nitrate as a raw material. By adjusting the pH value of the solution, chromium hydroxide precipitates, and then calcined at high temperature to produce chromium trioxide particles. The catalyst particle size prepared by this method is large, and the specific surface area and pore volume are small, which greatly affects ...

Claims

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Application Information

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IPC IPC(8): B01J23/26B01J37/00
Inventor 曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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