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Formed catalyst for directly catalyzing N2O to decompose and manufacturing method thereof

A catalyst, direct technology, applied in physical/chemical process catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of easy sintering and insufficient thermal stability of transition metal composite oxides, and achieve high mechanical strength, N2O The effect of wide concentration and strong antioxidant properties

Inactive Publication Date: 2014-01-15
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhu Shemin et al invented a catalytic decomposition of N 2 The transition metal composite oxide catalyst [CN 102489305] of O uses self-made ceramics as a carrier to support transition metal composite oxides. The transition metal oxides account for 1-15% of the total mass of the copper oxide catalyst, and the cocatalyst is selected from oxidation Cerium, iron oxide, zirconium oxide, and zinc oxide, which account for 1-10% of the total mass of the catalyst, can completely decompose N at 500°C 2 O is N 2 and O 2 , but supported transition metal composite oxides are easy to sinter, that is, insufficient thermal stability
The catalytic decomposition of N 2 O into O 2 and N 2 The catalyst is a composite oxide composed of copper oxide and cerium oxide. The general molecular formula is CuxCe1-xOy, 02 The O decomposition rate reaches 100%, but the catalyst is a non-supported metal composite oxide catalyst, and there is still a certain distance in the production of industrial shaped catalysts.

Method used

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  • Formed catalyst for directly catalyzing N2O to decompose and manufacturing method thereof
  • Formed catalyst for directly catalyzing N2O to decompose and manufacturing method thereof
  • Formed catalyst for directly catalyzing N2O to decompose and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of composite material carrier

[0029] 500g special pseudo-boehmite, 30gZrO 2 powder, 5g of scallop powder are mixed evenly, and then the powder is kneaded with 12g of nitric acid, 24g of acetic acid, and 350g of tap water to become a plastic body, and then extruded into a 5mm cylinder on an extruder to become a plastic body, the material is aged for 2 hours, and then Extruded into a 5mm cylinder on the extruder, then dewatered at low temperature for 12 hours, then dried at 100°C for 24 hours, and then put it into a muffle furnace for temperature-programmed roasting, the heating rate was 1°C / min, and the roasting temperature was 550°C. The calcination time is 4 hours, and the composite material carrier S1 is obtained by naturally cooling to room temperature in the furnace.

[0030] (2) Preparation of active ingredient solution

[0031] Weigh 87.2gZn(NO 3 ) 2 .6H 2 O solid, 6.4gNi(NO 3 ) 2 .6H 2 O solid, 9.6gCu(NO 3 )2.3H 2 O solid, water 14g...

Embodiment 2

[0037] (1) Preparation of composite material carrier

[0038] Mix 500g of special pseudo-boehmite and 5g of quince powder evenly, then knead the powder with 18g of 65-68wt% nitric acid, 24g of 99.5wt% acetic acid, 350g of water, and 317.8g of zinc nitrate to form a plastic body. Aged for 2 hours, then extruded into a 5mm cylinder on the extruder, then dewatered at low temperature for 12 hours, then dried at 100°C for 24 hours, then put into a muffle furnace for programmed temperature rise and roasting, the heating rate was 1°C / min, the roasting temperature Calcined at 550°C for 4 hours, and naturally cooled to room temperature in the furnace to obtain the composite material carrier S2.

[0039] (2) Preparation of active ingredient solution

[0040] Weigh 62.7gZn(NO 3 ) 2 .6H 2 O solid, 8gNi(NO 3 ) 2 .6H 2 O solid, 12.2gCu(NO 3 ) 2 .3H 2 O solid, water 18g, prepared into a solution.

[0041] (3) Impregnation and roasting of active components

[0042] Impregnate 60g ...

Embodiment 3

[0046] (1) Preparation of composite material carrier

[0047] Mix 500g of special pseudo-boehmite and 5g of fenugreek powder evenly, then knead the powder with 18g of 65-68wt% nitric acid, 24g of 99.5wt% acetic acid, 350g of tap water, and 317.8g of zinc nitrate to form a plastic body. Aged for 2 hours, then extruded into a 5mm cylinder on the extruder, then dewatered at low temperature for 12 hours, then dried at 100°C for 24 hours, then put into a muffle furnace for programmed temperature rise and roasting, the heating rate was 1°C / min, the roasting temperature The temperature is 550°C, the calcination time is 4h, and it is naturally cooled to room temperature in the furnace to obtain the composite material carrier S3.

[0048] (2) Preparation of active ingredient solution

[0049] Weigh 62.4gZn(NO 3 ) 2 .6H 2 O solid, 6.57gNi(NO 3 ) 2 .6H 2 O solid, water 22g, prepared into a solution.

[0050] (3) Impregnation and roasting of active components

[0051] Impregn...

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PUM

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Abstract

The invention relates to a preparation method for a formed catalyst for directly catalyzing N2O to decompose, and belongs to the technical field of environment protection catalytic materials and air pollution control. According to the catalyst, a compound material is used as a carrier to load metal oxide. The main active components are oxides of Zn and Ni, and one or two types from the oxides of Cu, Fe, Sr, La, Co, K, Na, Zr, Y or Ba are simultaneously loaded. The catalyst is characterized in that the compound material comprises two or more substances including clay, active carbon, bakelite powder, sesbania powder, special pseudo-boehmite powder, SiO2, TiO2, ZrO2, sandy soil and zinc oxide; the catalyst is columnar, clover-shaped or takes the shape of geranium nepalense sweet; the external diameter is 1-20 mm. The metal oxides accounts for 30-55% of the total weight of the catalyst, wherein the nickel oxide accounts for 1-5%, and the zinc oxide accounts for 30-45%. The catalyst can be widely used for removal and decomposing of N2O in a nitric plant, an adipic acid plant and other industrial process generating N2O.

Description

technical field [0001] The invention relates to a shaped direct catalytic N 2 The invention discloses a preparation method of a catalyst for decomposing O, which belongs to the technical fields of environmental protection catalytic materials and air pollution control. Background technique [0002] N 2 O is a colorless, sweet-smelling gas, also known as laughing gas, which can exist stably in the stratosphere for 150 years, and its warming potential is that of CO 2 310 times that of atmospheric N 2 Although the content of O is only about 9% of that of carbon dioxide. In August 2009, a new study in the United States showed that N 2 O has become the primary ozone-depleting substance emitted by humans. Since the Industrial Revolution, atmospheric N 2 The O content continued to increase, with an increase of 12.9%. It mainly comes from the coal-fired flue gas of fixed fluidized bed equipment, the production process of nitric acid, and the waste gas discharged from the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J23/83B01D53/86B01D53/56
CPCY02C20/10Y02P20/30
Inventor 李翠清罗林军李晶王虹宋永吉
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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