Preparation method of direct N2O catalytic decomposition catalyst

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.

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 ...

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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

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