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Deoxidation catalyst, preparation method and application thereof

A deoxidation catalyst and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of complex components, waste of resources, high chemical activity, etc. Achieve the effects of simple preparation process, good activity stability and high catalytic activity

Inactive Publication Date: 2010-01-13
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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AI Technical Summary

Problems solved by technology

CN1130542A discloses a kind of inert gas deoxidation method, the composition of the catalyst used is: CuO 25-50, ZnO 20-40, Cr 2 o 3 10-30, graphite 3-8, this method is only suitable for deoxidation of inert gas with oxygen content ≤5%
However, due to the high oxygen content in the tail gas, the concentration of propylene and propane is close to the explosion limit, which makes it very difficult to separate and recover them in the industry. Currently, enterprises burn them all
This not only seriously pollutes the environment, but also greatly wastes resources and reduces the benefits of enterprises.
[0007] Propylene epoxidation produces PO exhaust gas with high oxygen content and complex components, and some components (such as propylene) have high chemical activity. The existing technology cannot effectively remove oxygen from it, but effectively recover high-value, high-quality, and active Propylene and other components

Method used

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  • Deoxidation catalyst, preparation method and application thereof

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preparation example Construction

[0038] 2) Preparation of deoxidation catalyst

[0039] A pore-enlarging agent and a binder (liquid peptizer and solid peptizer) are added to the catalyst precursor for kneading, molding, drying and roasting. The solid peptizer used in the present invention comprises Al(OH) 3, pseudo-boehmite or gibbsite, etc., and other precursors of inorganic refractory oxides with bonding effect, the weight consumption accounts for 10%-80% of the dry basis of the entire catalyst, preferably 20%- 50%; the liquid peptizing agent is nitric acid, and its weight consumption accounts for 1%-8% of the dry basis of the entire catalyst, preferably 2%-4%.

[0040] The pore-enlarging agent used in the present invention is an organic pore-enlarging agent, preferably Tianqing powder and / or citric acid, and its weight consumption accounts for 1%-5% of the whole catalyst dry basis, preferably 1.5%-3.5%. The molded catalyst is dried at 80-120°C for 2-10 hours, and calcined at 450-650°C for 2-8 hours. The ...

Embodiment 1

[0048] Take the Cu, Zn, Mn, Ni nitrate mixed solution with a total concentration of 0.5mol / L (the molar ratio of Cu:Mn:Zn:Ni is Cu:Mn:Zn:Ni=4:3:2:0.2) In the separatory funnel, take 0.52mol / L of Na 2 CO 3 The solution was placed in another separatory funnel, and the two flowed together to control a certain flow rate and titrated into 15mL of high-speed stirred deionized water, while keeping the pH value of the solution between 7.5-8.5, aging at room temperature for 4h, suction filtration, Washing, drying at 110° C. for 20 hours, and calcining at 550° C. for 4 hours to obtain the catalyst precursor-composite oxide of copper, zinc, manganese and nickel. Add 4g of pore-enlarging agent Tianqing powder, 50g of solid peptizer pseudoboehmite and 7g of liquid peptizer nitric acid into 50g of the catalyst precursor for kneading, molding, drying and roasting. The molded catalyst was calcined at 110°C for 5 hours and 550°C for 4 hours. Its shape was a clover and its size was Φ5×6mm. T...

Embodiment 2

[0050] The preparation method of the deoxidation catalyst is the same as in Example 1, except that the Zn and Ni nitrate mixture is not added. The prepared deoxidation catalyst is designated as Cat-2, and its deoxidation performance and crushing strength are shown in Table 2.

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Abstract

The invention discloses a deoxidation catalyst and a preparation method and application thereof. The catalyst of the invention takes CuO and MnO2 as main catalytic active components, while metal oxides such as Zn, Ni and Au can be included and takes Al2O3 as adhesive. The deoxidization catalyst is prepared by a coprecipitation method, namely, a composite oxide of active component firstly prepared by the coprecipitation method is kneaded, molded, dried and baked with solid peptizator, liquid peptizator and pore-expanding agent. The deoxidization catalyst of the invention is applicable to a deoxidization process of high oxygen content gas mixture, especially to a deoxidation process of preparing epoxy propylene oxide tail gas by chlorohydrination. The deoxidization catalyst of the invention has the advantages of high activity and good selectivity, especially excellent activity stability, large amount of gas processing, conveniently preparation and low cost, etc.

Description

technical field [0001] The invention relates to a deoxygenation catalyst and its preparation method and application, in particular to a deoxygenation catalyst for a mixed gas with relatively high oxygen content and its preparation method and application. technical background [0002] Oxygen is one of the main components of the atmosphere, so some process raw materials often contain oxygen in different amounts. In addition, some processes need to introduce oxygen, so the exhaust gas often contains a certain amount of oxygen. In some working conditions, the process feed gas needs to be deoxygenated before use; in some working conditions, the process exhaust gas also needs to be deoxygenated before further treatment or utilization. [0003] The deoxygenation process of mixed gas mainly includes physical methods and chemical methods, physical methods such as adsorption method, chemical methods such as combustion method, catalytic reduction method and so on. Among them, the cat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/14C07C7/148C07C11/06
CPCY02P20/52
Inventor 宋丽娟桂建舟孙兆林刘丹刘东亮
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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