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A kind of spinel catalyst and preparation method thereof

A spinel type, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical elements of heterogeneous catalysts, etc., can solve problems such as deactivation, sulfur poisoning, and no sulfur resistance performance.

Active Publication Date: 2021-09-14
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although perovskite catalysts are X It has good catalytic activity, but the problem of sulfur poisoning has always been a shortcoming of perovskite catalysts
[0015] However, due to the unavoidable content of SO in the exhaust of diesel vehicles 2 Gas, many catalysts currently do not show particularly superior sulfur resistance, and are prone to sulfur poisoning and deactivation
Iron-based spinel catalysts also have the problem of changing their catalytic activity and sulfur poisoning resistance.

Method used

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  • A kind of spinel catalyst and preparation method thereof
  • A kind of spinel catalyst and preparation method thereof
  • A kind of spinel catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Weigh 48.372g of ferric nitrate, 3.654g of nickel nitrate, 15.005g of copper nitrate and 57.642g of citric acid, add to 500ml of deionized water, and stir continuously at room temperature until dissolved and mixed evenly.

[0038] The above mixed solution was placed in a water bath, heated in a water bath at 80° C. for 8 h, and the mixed solution was evaporated to dryness until a gel was formed.

[0039] Then put the gel into a blast drying oven, and dry it by blasting at 120°C until it becomes a dry gel to obtain Cu 0.8 Ni 0.2 Fe 2 o 4 type spinel precursors.

[0040] Put the precursor into a muffle furnace and bake at 600°C for 4h to obtain Cu 0.8 Ni 0.2 Fe 2 o 4 spinel catalyst. The catalyst of this embodiment is abbreviated as CN02FO.

Embodiment 2

[0042] Weigh 48.372g of ferric nitrate, 5.481g of nickel nitrate, 13.129g of copper nitrate and 57.642g of citric acid, add to 500ml of deionized water, and stir continuously at room temperature until dissolved and mixed evenly.

[0043] The above mixed solution was placed in a water bath, heated in a water bath at 80° C. for 8 h, and the mixed solution was evaporated to dryness until a gel was formed.

[0044] Then put the gel into a blast drying oven, and dry it by blasting at 120°C until it becomes a dry gel to obtain Cu 0.7 Ni 0.3 Fe 2 o 4 type spinel precursors.

[0045] Put the precursor into a muffle furnace and bake at 600°C for 4h to obtain Cu 0.7 Ni 0.3 Fe 2 o 4 spinel catalyst. The catalyst of this embodiment is abbreviated as CN03FO.

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Abstract

The invention relates to a spinel-type catalyst, which is an iron-based spinel-type oxide formed by taking Cu as the A-site metal, Fe as the B-site metal, and doping metal Ni at the A-site. The structural formula is Cu 1‑ X Ni X Fe 2 o 4 , where 0.1≤X≤0.5. The catalyst adopts the sol-gel method, and the water-soluble salts of metal iron, nickel and copper are dissolved in water together with the complexing agent citric acid to form a uniform mixed solution, and the solution is evaporated to dryness to form a dry gel-like spinel precursor, which is roasted A spinel-type catalyst is obtained. Catalyst of the present invention is to NO in the exhaust gas of diesel vehicle X It has obvious catalytic removal effect and has good anti-sulfur performance.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a spinel catalyst, in particular to a method for catalytically removing NO from diesel vehicle exhaust. X spinel catalysts. Background technique [0002] Diesel engines are widely used as commercial vehicle engines due to their low fuel consumption, high thermal efficiency, and low CO emissions. However, harmful NO in diesel vehicle exhaust X The emission is relatively serious, and the NO in the tail gas X It is important to control and purify. [0003] Removal of NO from diesel vehicle exhaust X The researches are mainly focused on the performance of catalysts. Catalysts used for diesel vehicle exhaust purification mainly include noble metal catalysts, molecular sieve catalysts and composite metal oxide catalysts. [0004] Precious metals were first used to remove NO from diesel vehicle exhaust X Commonly used noble metals include Pt, Pd, Rh, and Au, among whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01D53/94B01D53/56
CPCB01D53/9413B01D2258/01B01J23/002B01J23/755B01J2523/00B01J2523/17B01J2523/842B01J2523/847
Inventor 梁美生辛博田晓峰张峰李龙陈一琛
Owner TAIYUAN UNIV OF TECH