Si-Fe/gamma-Al2O3 catalyst and preparation method thereof

A catalyst and co-catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low catalytic activity, difficulty in rapid and efficient oxidation and degradation of phenolic pollution It can achieve high catalytic activity, good catalytic oxidation effect, and the effect of reducing activation energy

Active Publication Date: 2021-12-31
BENGBU COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the Fenton-like oxidation method is a more promising method for the treatment of phenol-containing wastewater. Fenton and Fenton-like oxidation methods use Fe 2+ , Fe 3+ , Fe 2 o 3 , Fe 3 o 4 or other transition metal ions (such as Co 3+ 、Cd 2+ 、Cu 2+ 、Ag + , Mn 2+ 、Ni 2+ ) in one or two with H 2 o 2 The composed oxidation system catalyzes the oxidation of phenolic substances. Compared with the homogeneous Fenton-like

Method used

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  • Si-Fe/gamma-Al2O3 catalyst and preparation method thereof
  • Si-Fe/gamma-Al2O3 catalyst and preparation method thereof
  • Si-Fe/gamma-Al2O3 catalyst and preparation method thereof

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preparation example Construction

[0037] The Si-Fe / γ-Al of this example 2 o 3 The preparation method of catalyst comprises the following steps:

[0038] S1: crushing the boehmite into particles with a particle size ranging from 0.250 to 0.425 mm to obtain boehmite powder for later use;

[0039] S2: The boehmite powder is heated up to 550-650°C at a rate of 5-10°C / min, and heated at a constant temperature for 3-6 hours to prepare γ-Al 2 o 3 Powder;

[0040] S3: Dissolve the structure directing agent in deionized water, then add Fe(NO 3 ) 3 9H 2 O, stir until completely dissolved, then add tetraethylorthosilicate dropwise, and stir evenly to obtain a mixed solution; the structure-directing agent includes polyethylene glycol, cetyltrimethylammonium bromide, One or more of block copolymer P123 and triblock copolymer F127;

[0041] S4: to γ-Al 2 o 3 Add the mixed solution obtained by adding S3 dropwise to the powder, and stir and react at 25°C for 6-18 hours to obtain a catalyst precursor; the structure-d...

Embodiment 1

[0043] Embodiment 1 prepares Si 0.05 -Fe / γ-Al 2 o 3 catalyst

[0044] S1: crushing the boehmite into particles with a particle size ranging from 0.250 to 0.425 mm to obtain boehmite powder for later use;

[0045] S2: The boehmite powder is heated up to 550°C at a rate of 5°C / min, and heated at a constant temperature for 3 hours to prepare γ-Al 2 o 3 Powder;

[0046] S3: Dissolve 0.1g cetyltrimethylammonium bromide in 4mL deionized water, then add 3.6173g Fe(NO 3 ) 3 9H 2 O, after stirring until completely dissolved, add 0.1854g tetraethyl orthosilicate dropwise, after stirring evenly, a mixed solution is obtained;

[0047] S4: to 5.0g γ-Al 2 o 3 The mixed solution obtained by adding S3 dropwise to the powder was stirred and reacted at 25°C for 12 hours to obtain a catalyst precursor;

[0048] S5: Dry the catalyst precursor at 120°C, move it into a crucible and cover it, put it into a muffle furnace, bake it at 500°C for 4 hours, and cool it to room temperature at 25...

Embodiment 2

[0049] Embodiment 2 prepares Si 0.10 -Fe / γ-Al 2 o 3 catalyst

[0050] S1: crushing the boehmite into particles with a particle size ranging from 0.250 to 0.425 mm to obtain boehmite powder for later use;

[0051] S2: The boehmite powder is heated up to 600°C at a rate of 5°C / min, and heated at a constant temperature for 4 hours to prepare γ-Al 2 o 3 Powder;

[0052] S3: Dissolve 0.1g polyethylene glycol 4000 in 4mL deionized water, then add 3.6173gFe(NO 3 ) 3 9H 2 O, after stirring until completely dissolved, add 0.3709g tetraethyl orthosilicate dropwise, after stirring evenly, a mixed solution is obtained;

[0053] S4: to 5.0g γ-Al 2 o 3 The mixed solution obtained by adding S3 dropwise to the powder was stirred and reacted at 25°C for 12 hours to obtain a catalyst precursor;

[0054] S5: Dry the catalyst precursor at 120°C, move it into a crucible and cover it, put it into a muffle furnace, bake it at 500°C for 4 hours, and cool it to room temperature at 25°C natu...

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Abstract

The invention discloses a Si-Fe/gamma-Al2O3 catalyst and a preparation method thereof. According to the Si-Fe/gamma-Al2O3 catalyst, an Si element is used as a cocatalyst, an Fe element is used as an active component, and gamma-Al2O3 is used as a carrier for the first time; the mass ratio of the Si element to the Fe element to the gamma-Al2O3 is (0.05-0.2): 1: 10; the preparation method comprises the following steps: S1, preparing boehmite powder; S2, heating the boehmite powder to 550-650 DEG C at the speed of 5-10 DEG C/min, performing constant-temperature heating for 3-6 h, and preparing gamma-Al2O3 powder; S3, dissolving the structure-directing agent in deionized water, adding Fe (NO3)3.9 H2O, dropwise adding tetraethyl orthosilicate, and uniformly stirring to obtain a mixed solution; S4, dropwise adding the mixed solution obtained in S3 into gamma-Al2O3 powder, and carrying out stirring reaction at 25 DEG C for 6-18 hours to obtain a catalyst precursor; and S5, drying the catalyst precursor at 80-120 DEG C, roasting at 400-500 DEG C for 3-5 hours, and cooling to obtain the catalyst. The Si-Fe/gamma-Al2O3 heterogeneous Fenton-like catalyst prepared by the invention has the advantages of high catalytic activity, multiple active sites and separability and regeneration, can efficiently remove COD of phenolic wastewater, and also can effectively catalyze and oxidize quinolone antibiotics.

Description

technical field [0001] The invention belongs to the field of catalyst synthesis, in particular to a Si-Fe / γ-Al 2 o 3 Catalyst and method for its preparation. Background technique [0002] Phenol-containing wastewater is wastewater containing volatile phenols and non-volatile phenols discharged during industrial production, mainly from coking, oil refining, petrochemical, gas power stations, plastics, resins, insulating materials, wood preservation, pesticides, chemicals, Papermaking, synthetic fiber and other industries. Phenol-containing wastewater has the characteristics of high toxicity and refractory degradation. When phenolic compounds enter the human body and react accordingly, it will cause cell degeneration or cell inactivation, and even cause the coagulation of tissue proteins. Long-term drinking of phenol-contaminated water can cause chronic cumulative poisoning. Even if the concentration of phenol in drinking water is only 0.002mg / L, it will also endanger human...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J35/10C02F1/72C02F101/34C02F101/38C02F101/30
CPCB01J23/745C02F1/725C02F1/722B01J35/1019B01J35/1061B01J35/1038B01J23/002C02F2305/026C02F2305/023C02F2101/345C02F2209/08C02F2101/38C02F2101/30B01J2523/00B01J2523/31B01J2523/41B01J2523/842
Inventor 赵建军刘沐鑫疏艳
Owner BENGBU COLLEGE
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