Preparation method of direct N2O catalytic decomposition catalyst

A catalytic decomposition and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of insufficient thermal stability and easy sintering of transition metal composite oxides and other problems, to achieve the effect of high mechanical strength, wide application range and good thermal stability

CN103506129AInactive Publication Date: 2014-01-15BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-01-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of a direct N2O catalytic decomposition catalyst, and belongs to the technical field of environment-friendly catalytic materials and atmospheric pollution control. The catalyst uses a composite as a carrier and loads two layers of metal oxide by twice or multiple times of impregnation. The composite is the molded product of two or more of clay, activated carbon, bakelite powder, sesbania powder, special pseudo-boehmite powder, SiO2, TiO2, ZrO2, sandy soil or high alumina cement; the first layer of metal oxide is the composite oxide of Cu, Zn and Ni, and the second layer of metal oxide is an oxide of Ba, Ca, Mg, Y, Cr, Mo, Co, La, Pr or Nd; the catalyst takes the shape of a column, a clover or a five-leaf grass, and the outer diameter is 1-20 nm. The catalyst can be widely used in decomposition of N2O in a nitric plant, an adipic acid plant or other N2O-producing industrial processes.
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Description

technical field

[0001] The invention relates to a direct catalytic decomposition of N 2 The invention discloses a method for preparing a catalyst for O, belonging 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 production ...

Examples

Embodiment 1

[0029] (1) Preparation of composite material carrier

[0030] Mix 500g of special pseudo-boehmite and 5g of activated carbon evenly, then knead the powder with 12g of nitric acid, 24g of acetic acid, and 350g of water to form a plastic body. The material is aged for 2 hours, and then extruded into a 3mm cylinder on the extruder. Then remove water at low temperature for 12 hours, then dry at 100°C for 24 hours, then put it into a muffle furnace for programmed temperature rise and segmental roasting, from room temperature to 200°C at a rate of 2°C / min, keep the temperature for 1 hour, and then increase the temperature at 1°C / min to 400°C, then raised the temperature to 550°C at 2°C / min, kept the temperature for 4 hours, and finally cooled naturally in the furnace to room temperature to obtain the composite material carrier S1.

[0031] (2) Preparation of the first layer of metal component solution

[0032] Weigh 17.39gZn(NO 3 )2.6H 2 O solid, 2.03gCu(NO 3 )2.3H 2 O solid, 1...

Embodiment 2

[0042] (1) Vector preparation

[0043] Mix 500g of special pseudo-boehmite and 5g of high-alumina cement powder evenly, then knead the powder with 12g of nitric acid, 24g of acetic acid, and 350g of water to form a plastic body. The material is aged for 2 hours, and then extruded into a 3mm cylinder on the extruder Then remove water at low temperature for 12 hours, then dry at 100°C for 24 hours, then put it into a muffle furnace for programmed temperature rise and segmental roasting, from room temperature at 2°C / min to 200°C, keep the temperature for 1h, and then at 1°C / min to 400°C, then to 550°C at 2°C / min, the temperature was maintained for 4h, and finally cooled to room temperature naturally in the furnace to prepare the composite material carrier S2.

[0044] (2) Impregnation and roasting of the first layer of metal component solution

[0045] Weigh 17.39gZn(NO 3 )2.6H 2 O solid, 2.03gCu(NO 3 )2.3H 2 O solid, 1.35gNi(NO 3 )2.6H 2 O solid, 4g of water, mix wel...

Embodiment 3

[0055] (1) Vector preparation

[0056] Mix 500g of special pseudo-boehmite and 5g of scallop powder evenly, then knead the powder with 12g of nitric acid, 24g of acetic acid, and 350g of water to form a plastic body. The mixture is aged for 2 hours, and the material is aged for 2 hours. Extrude into a 3mm cylinder, then remove water at low temperature for 12 hours, then dry at 100°C for 24 hours, then put it into a muffle furnace for programmed temperature rise and segmental roasting, from room temperature to 200°C at a rate of 2°C / min, and keep the temperature for 1h. Then the temperature was raised to 400°C at 1°C / min, and then to 550°C at 2°C / min, the temperature was maintained for 4 hours, and finally cooled to room temperature naturally in the furnace to prepare the composite material carrier S3.

[0057] (2) Impregnation and roasting of the first layer of metal component solution

[0058] Weigh 17.39gZn(NO 3 )2.6H 2 O solid, 2.03gCu(NO 3 )2.3H 2 O solid, 1.35g...