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Activation method of vanadium-containing oxide catalyst

An activation method, a vanadium oxide technology, applied in catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as catalyst performance decline, and achieve catalyst uniformity, high activity, and excellent stability. Effect

Active Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an improved activation method for vanadium-containing oxide catalysts in view of the problem that the performance of the catalyst decreases after the number of activated catalysts is increased in the existing vanadium-containing oxide catalyst activation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 5 kg of catalyst precursor particles were loaded into the atmosphere furnace in layers, and heat exchange heat pipes were arranged between the layers. Introduce air into the atmosphere furnace, and control the temperature of the atmosphere furnace to 260°C, keep the catalyst at 260°C for 2 hours; adjust the input airflow composition to 50% air / 10% nitrogen / 30% water vapor / 10% carbon dioxide, The temperature of the atmosphere furnace was raised to 360°C for 25 minutes, and the temperature was kept for 1 hour. At this time, the water flow in the heat pipe is turned on and the heat is exchanged. The water flow in the heat pipe of the atmosphere furnace is opposite to the gas flow. After the end, the atmosphere furnace was heated to 425°C for 30 minutes in an atmosphere with an input airflow composition of 40% air / 20% nitrogen / 30% water vapor / 10% carbon dioxide, and kept for 1 hour, and the input airflow composition was adjusted to 60% nitrogen / 30% Water vapor / 10% carbon d...

Embodiment 2

[0037] 5 kg of catalyst precursor particles were loaded into the atmosphere furnace in layers, and heat exchange heat pipes were arranged between the layers. Introduce air into the atmosphere furnace, and control the temperature of the atmosphere furnace to 260°C, keep the catalyst at 260°C for 2 hours; adjust the input airflow composition to 50% air / 10% nitrogen / 30% water vapor / 10% carbon dioxide, The temperature of the atmosphere furnace was raised to 360°C for 25 minutes, and the temperature was kept for 1 hour. At this time, the water flow in the heat pipe is turned on and the heat exchange is performed. The water flow in the heat pipe of the atmosphere furnace is opposite to the gas flow, and the water flow in the heat pipe is kept for 60 minutes. After the end, the input air flow composition is 40% air / 20% nitrogen / 30% In the water vapor / 10% carbon dioxide atmosphere, raise the temperature of the atmosphere furnace to 425°C for 30 minutes, and keep it warm for 1 hour. Ad...

Embodiment 3

[0039] 5 kg of catalyst precursor particles were loaded into the atmosphere furnace in layers, and heat exchange heat pipes were arranged between the layers. Introduce 50% air / 50% nitrogen into the atmosphere furnace, and control the temperature of the atmosphere furnace to 280°C, keep the catalyst at 280°C for 2 hours; adjust the composition of the input airflow to 25% air / 25% nitrogen / 50% water Steam, the temperature of the atmosphere furnace is raised to 340°C for 30 minutes, and the heat preservation is carried out for 2 hours. At this time, the heat exchange of the heat pipe is turned on, the water flow in the heat pipe of the atmosphere furnace is in the opposite state to the flow of the gas, and the water is kept flowing in the heat pipe for 30 minutes. After the end, the temperature of the atmosphere furnace is raised to 425°C for 30 minutes, and kept for 1 hour, and the input air flow composition is adjusted to 50%. Nitrogen / 50% water vapor, the temperature was raised...

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Abstract

The invention discloses an activation method of a vanadium-containing oxide catalyst. The activation method comprises the following steps: S1, activating a catalyst precursor in an oxygen-containing mixed atmosphere 1 at T1 temperature; S2, activating the catalyst precursor obtained in the step S1 in an oxygen-containing mixed atmosphere 2 at the temperature of T2; S3, activating the catalyst precursor obtained in the step S2 in an oxygen-containing mixed atmosphere 3 at the temperature of T3; S4, activating the catalyst precursor obtained in the step S3 in an oxygen-free mixed atmosphere 4 at the temperature of T4; wherein T4 is greater than T3, T3 is greater than T2, and T2 is greater than T1. In the step S2, the activation temperature is kept within the range of T2-(T2+15) DEG C by performing additional heat exchange treatment. When the activation method is used for activation, the obtained catalyst has high maleic anhydride selectivity and excellent stability, and can be used for activation treatment of industrial vanadium-phosphorus oxide catalysts.

Description

technical field [0001] The invention relates to an activation method for a vanadium-containing oxide catalyst, belonging to the field of preparation of a vanadium-containing oxide catalyst. Background technique [0002] Vanadium-containing oxides are often used as catalysts for selective oxidation reactions because of their good catalytic properties for redox reactions. Among them, the vanadium phosphorus oxygen (VPO) catalyst is by far the most effective catalyst for catalyzing the selective oxidation of hydrocarbons in the gas phase, especially the oxidation of n-butane to maleic anhydride. [0003] VPO catalysts can be prepared from water or organic solvents. Early studies usually use pentavalent vanadium oxides such as vanadium pentoxide (V2O5) to react in the presence of water and HCl. Currently, VPO catalyst precursors It is mainly prepared by an organic method, and the preparation process usually uses pentavalent vanadium oxide and phosphoric acid to reflux in an org...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/28B01J38/02B01J38/16B01J38/20B01J38/06C07D307/60
CPCB01J27/285B01J38/02B01J38/16B01J38/20B01J38/06C07D307/60Y02P20/584Y02P20/52
Inventor 曾炜顾龙勤陈亮王丹柳方敏
Owner CHINA PETROLEUM & CHEM CORP