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Catalyst composition for oxidation reaction

An oxidation reaction and catalyst technology, applied in the direction of physical/chemical process catalysts, hydrocarbons, hydrocarbons, etc., can solve problems such as changes in catalyst composition and structure, catalyst performance degradation, and impact on catalyst performance

Inactive Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to our early research results, the Mo-V-Te-Nb-O catalyst itself is relatively stable under mild reaction conditions in the reaction of ethane oxidation to ethylene, but when the reaction conditions are relatively severe (such as high space velocity and high temperature In the case of pressurization, etc.), the catalyst performance may gradually decrease due to the sharp rise of the hot spot temperature. The reason for the analysis may be that Te in the active component is easier to be reduced and precipitated when the hot spot temperature is higher. This leads to changes in the composition and structure of the catalyst, and ultimately affects the performance of the catalyst in the ethane oxidation reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The Mo-V-Te-Nb-O catalyst (catalytically active component (CN101612564) is prepared by a temperature-programmed hydrothermal synthesis method. The steps include: first weighing the proportioned ammonium molybdate, vanadyl sulfate, telluric acid and niobium oxalate respectively Dissolve in hot deionized water, heat each solution for 30 minutes, slowly mix each solution together, continue to stir for 10 minutes, transfer it to a stainless steel tube synthesis kettle, and raise the temperature from room temperature at a rate of 10°C / min. to 190°C, keep warm for 20h and then drop to room temperature naturally, then take it out, filter, and dry. After grinding the obtained black solid, place it in a roasting container, raise the temperature from room temperature to 300°C at a rate of 3°C / min and keep it warm After 2 hours (atmosphere is air), then rise to 600° C. at the same heating rate and continue to keep warm for 2 hours (atmosphere is nitrogen) to naturally cool down, an...

Embodiment 2

[0037] The Mo-V-Te-Nb-O catalyst was prepared according to the method of Example 1.

[0038] Take 1g of 20-30 mesh prepared Mo-V-Te-Nb-O catalyst for the selective oxidation reaction of ethane. The reaction conditions are different from those in Example 1. The specific reaction conditions are: the reaction temperature is 380°C, and the total volume of the reaction is empty. Speed ​​4000h -1 , ethane / oxygen / nitrogen (volume ratio) is 30 / 20 / 50, and the reaction pressure is 3atm (3 atmospheres). The reaction lasted for 900 hours, and the reaction results are listed in Table 2. The results showed that under relatively severe reaction conditions, the activity of the catalyst decreased significantly with time, and the conversion rate of ethane decreased by about 26.8% within 900 hours.

[0039] Table 2

[0040]

[0041]

Embodiment 3

[0043] Referring to the preparation method of Example 1, and added 30% Alpha-Al in the preparation process 2 o 3 , to prepare the Mo-V-Te-Nb-O catalyst composition of this embodiment.

[0044]1 g of the 20-30 mesh catalyst composition prepared above was used for the selective oxidation of ethane, and the reaction conditions were the same as in Example 2. The reaction lasted for 900 hours, and the reaction results are listed in Table 3. The results showed that Al 2 o 3 The addition of the active component is conducive to stabilizing the catalyst performance. Even if the reaction conditions are relatively harsh, the ethane conversion rate will drop by about 15.6% within 900 hours, which obviously inhibits or delays the decline rate of the catalyst performance.

[0045] table 3

[0046]

[0047]

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Abstract

The present invention discloses a catalyst composition for an oxidation reaction. The composition is a mixture of a molybdenum-vanadium-tellurium-niobium catalyst and a stabilizer. The stabilizer is Al2O3. Based on previous work, Al2O3 with catalysis stabilizing effect is creatively introduced, can stabilize the catalyst under severe reaction conditions and significantly reduces the production cost of the catalyst.

Description

technical field [0001] The present invention relates to the reaction of oxidizing ethane to prepare ethylene, especially to the catalyst in the reaction. Background technique [0002] It has always been an urgent need for the development of the ethylene industry to develop low-energy, environmentally friendly ethylene production technology routes. Among them, the introduction of oxidizing agents (such as O 2 Or Air, etc.) to change the ethylene dehydrogenation reaction from a strong endothermic reaction to a simple exothermic reaction, which has become one of the ideas of the majority of scientific researchers. Researchers at home and abroad have done a lot of research and exploration in related fields. [0003] In our early research, it was found that the Mo-V-Te-Nb-O catalyst performed well in the reaction of ethane oxidation to ethylene, and had certain industrial application prospects (CN1795987A, CN101612564). However, as we all know, if a catalyst has good industria...

Claims

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Application Information

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IPC IPC(8): B01J27/057C07C5/333C07C11/04
CPCY02P20/52B01J27/0576C07C5/3332C07C11/04
Inventor 杨维慎王红心楚文玲李清强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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