Preparation method Fe/ZSM-5 catalyst for directly decomposing N2O

A ZSM-5 catalyst technology, applied in the field of Fe/ZSM-5 catalyst preparation, can solve the problems of limited iron content, easy precipitation of iron species, poor reproducibility, etc., to reduce iron loss, increase activity, and reduce formation Effect

Active Publication Date: 2009-06-10
KAILING CHEM ZHANGJIAGANG CO LTD
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AI Technical Summary

Problems solved by technology

The main disadvantage of the hydrothermal synthesis method is that the content of iron introduced into the framework is limited, and it is difficult to synthesize catalysts with high iron content.
The disadvantage of the liquid-phase ion exchange method is that iron species tend to precipitate in aqueous solution, thereby easily forming inert iron oxide particles; in addition, this method is relatively po

Method used

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  • Preparation method Fe/ZSM-5 catalyst for directly decomposing N2O
  • Preparation method Fe/ZSM-5 catalyst for directly decomposing N2O
  • Preparation method Fe/ZSM-5 catalyst for directly decomposing N2O

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1—10

[0039] The catalytic experiments in Examples 1-10 described below were carried out in a U-shaped quartz reaction tube with an inner diameter of 4 mm in the furnace. The reaction takes place in a constant temperature zone in the furnace. The amount of the catalyst is about 50 mg, and the two ends of the catalyst are respectively filled with quartz wool to prevent the loss of the catalyst. The tail gas after the reaction was analyzed by an online quadrupole mass spectrometer.

[0040] Description of the catalyst used

Embodiment 1

[0042] Weigh 2.0 g NH 4 -ZSM-5 type zeolite (Nankai University Catalyst Factory, Si / Al=25, Fe content is lower than 400ppm) is put into U-shaped tube, puts into muffle furnace again and bakes at 550 ℃ for 6 hours, seals, and cools. Put it in a dry box, and 0.0714 grams of FeCl 3 Ball mill for 30 minutes. Seal it, remove it, put it into a tube furnace, heat it to 320° C. in an Ar atmosphere, and keep it for 2 hours. After cooling, the temperature was raised to 200° C. for 1 hour in an Ar atmosphere containing 0.5 vol.% water vapor for hydrolysis. and then in O 2 The temperature was raised to 550° C. in the atmosphere and kept for two hours to obtain a zeolite catalyst with Fe / Al=0.33. The sample number is A.

Embodiment 2

[0044] A part of the catalyst A obtained in Example 1 was taken out, put into a U-shaped tube, and heated to 900° C. in an Ar atmosphere, and kept for 2 hours. The sample number is B.

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Abstract

The invention relates to a method for preparing an Fe/ZSM-5 catalyst for directly decomposing N2O, which comprises the following steps: (a), roasting NH4-ZSM-5 zeolite molecular sieves at a temperature of between 500 and 600 DEG C for 2 to 6 hours, cooling and sealing the NH4-ZSM-5 zeolite molecular sieves, and moving the NH4-ZSM-5 zeolite molecular sieves into a drying cabinet; (b), mixing and grinding the zeolite molecular sieves treated in the step a and an iron salt precursor, raising the temperature to be between 300 and 400 DEG C in inert atmosphere, and maintaining the mixture for 1 to 2 hours, wherein the content of iron is 0.01 to 10 weight percent of the total weight of the zeolite molecular sieves and the iron salt precursor; (c), cooling the product in the step b, and hydrolyzing the product in vapor-containing inert atmosphere for 1 to 2 hours at a temperature of between 150 and 200 DEG C; and (d), roasting the product in the step c in oxygen atmosphere for 1 to 2 hours at a temperature of between 500 and 600 DEG C and at a temperature rise speed of between 1 and 8 DEG C per minute.

Description

technical field [0001] The present invention relates to a method for N 2 Preparation method of Fe / ZSM-5 catalyst for direct decomposition of O. [0002] The characteristic of the present invention is that the catalyst is prepared by the liquid-phase ion exchange method in the past, and is prepared by the solid-state ion exchange method, so that the hydrolysis and precipitation of the iron salt precursor can be avoided, and the generation of inert iron oxide can be reduced. In addition by selecting FeCl 3 This easily sublimated precursor can make the distribution of the active phase more uniform. N can be increased by adding Ga, B, P and high temperature roasting 2 active sites for O decomposition, thereby improving its catalytic activity. Background technique [0003] Nitrous oxide (N 2 O), commonly known as laughing gas, as a mild anesthetic used in medical treatment, this colorless gas with a slightly sweet taste has been neglected for a long time. However, since the...

Claims

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Application Information

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IPC IPC(8): B01J29/42B01D53/56
CPCY02C20/10
Inventor 李灿夏海岸孙科强冯兆池应品良
Owner KAILING CHEM ZHANGJIAGANG CO LTD
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