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

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...

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.

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