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Fe molecular sieve composite catalyst and preparation method thereof

A composite catalyst and molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, separation methods, etc., can solve the problems of catalyst carbon deposition and deactivation, achieve good catalyst activity, improve anti-carbon deposition performance, and inhibit adsorption and deposition. effect of carbon

Active Publication Date: 2012-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the purification of NOx in motor vehicle exhaust, the industry is currently optimistic about catalysts with Cu and Fe as active components and H-ZSM-5 and Beta as carriers. It has been found in practical applications that the inevitable hydrocarbon emissions in exhaust , will cause different degrees of catalyst carbon deposition and deactivation

Method used

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  • Fe molecular sieve composite catalyst and preparation method thereof
  • Fe molecular sieve composite catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of Fe molecular sieve composite catalyst, comprises following component:

[0024] The content of the active component Fe is 2.5wt.%, the content of the catalyst carrier Beta is 82.5wt.%, and the mordenite is 15wt.%.

[0025] A preparation method of Fe molecular sieve composite catalyst, comprising the steps of:

[0026] 1. Measure 300mL of deionized water, add 5g of H-Beta molecular sieve with a Si / Al molar ratio of 12.5, stir on a magnetic stirrer for 30min at room temperature at 30°C, and then add 5g of FeCl according to the stoichiometric ratio 2 , stirred at room temperature for 24 hours, and carried out ion exchange;

[0027] 2. Wash and filter with 5 times deionized water to remove Cl ions in the solution, and dry the obtained filter cake in an oven at 110°C for 15 hours;

[0028] 3. Roast the dried filter cake in a muffle furnace at 600°C for 5 hours to obtain Fe / Beta molecular sieve catalysts, which are respectively recorded as Fe / ZSM-5, Fe / Beta, Fe / ZSM...

Embodiment 2

[0033] An Fe molecular sieve composite catalyst comprises the following components: the active component Fe is 3wt.%, the catalyst carrier Beta is 77wt.%, and the mordenite is 20wt.%.

[0034] A preparation method of Fe molecular sieve composite catalyst, comprising the steps of:

[0035] 1. Measure 350mL of deionized water, add 8g of H-Beta molecular sieve with a Si / Al molar ratio of 15, stir on a magnetic stirrer for 40min at room temperature of 30°C, and then add 4g of FeCl according to the stoichiometric ratio 2 , stirred at room temperature for 28 hours, and carried out ion exchange;

[0036] 2. Wash and filter with 6 times deionized water to remove Cl ions in the solution, and dry the obtained filter cake in an oven at 110°C for 15 hours;

[0037] 3. Calcining the dried filter cake in a muffle furnace at 600°C for 3 hours to obtain a Fe / Beta molecular sieve catalyst;

[0038] 4. Put the Fe / Beta molecular sieve catalyst obtained above into 80mL of water, add 2.5g of pre...

Embodiment 3

[0042] A kind of Fe molecular sieve composite catalyst, comprises following component:

[0043] The active component Fe is 5wt.%, the catalyst carrier Beta is 70wt.%, and the mordenite is 25wt.%.

[0044] A preparation method of Fe molecular sieve composite catalyst, comprising the steps of:

[0045] 1. Measure 250mL of deionized water, add 10g of H-Beta molecular sieve with a Si / Al molar ratio of 15, stir on a magnetic stirrer for 35min at room temperature of 30°C, and then add 2g of FeCl according to the stoichiometric ratio 2 , stirred at room temperature for 30 hours, and carried out ion exchange;

[0046] Second, wash and filter with 5 times deionized water to remove Cl ions in the solution, and dry the obtained filter cake in an oven at 110°C for 18 hours;

[0047] 3. Calcining the dried filter cake in a muffle furnace at 600°C for 4 hours to obtain a Fe / Beta molecular sieve catalyst;

[0048] 4. Put the Fe / Beta molecular sieve catalyst obtained above into 100mL of wa...

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Abstract

The invention relates to a Fe molecular sieve composite catalyst, which comprises an active component Fe, a catalyst carrier Beta and a mordenite. A preparation method comprises the following steps of: 1, performing ion exchange on a Si / Al H-Beta molecular sieve and FeCl2; 2, removing Cl ions in the solution, and drying the obtained filter cake and roasting the filter cake in a muffle furnace to obtain the Fe / Beta molecular sieve catalyst; 3, placing the Fe / Beta molecular sieve catalyst in the water, adding the mordenite, and roasting the mixture to obtain the Fe / Beta / Mor molecular sieve composite catalyst; 4, dissolving the Fe / Beta / Mor molecular sieve into the de-ionized water, and adding concentrated nitric acid to obtain coating serum; and 5, dipping a Cordierite honeycomb ceramic carrier in the serum, blowing a residual liquid, and after drying the mixture in the shade, drying and roasting the mixture. The catalyst can efficiently purify NOx in the tail gas of a diesel vehicle, a lean-burning gasoline car and a lean-burning natural gas vehicle, and has the characteristics of environment protection and highly efficient catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of nitrogen oxide control in environmental protection, and in particular relates to an Fe molecular sieve composite catalyst and a preparation method thereof. Background technique [0002] With the advancement of science and technology, productivity has been greatly improved, but the living environment of human beings has also been greatly damaged, and global environmental problems such as acid rain, photochemical smog, ozone layer destruction and greenhouse effect have become increasingly prominent. The occurrence of these problems is closely related to the hydrocarbons and nitrogen oxides emitted by humans into the atmosphere. According to incomplete estimates, the global NOx emitted into the atmosphere due to the burning of fossil fuels is about 8.6×10 10 kg, NOx has become one of the main pollutants in the atmospheric environment. At the same time, people's calls for environmental protection are gettin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01J29/76B01J29/24B01J37/00B01D53/94B01D53/56
Inventor 李俊华马磊郝吉明傅立新
Owner TSINGHUA UNIV
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