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Molybdenum vanadium tellurium niobium composite catalyst

A composite catalyst and catalyst technology, which is applied in the direction of physical/chemical process catalysts, organic chemistry, hydrocarbons, etc., can solve the problems of carbon deposition on the tube wall, easy reduction and precipitation, and catalyst performance degradation.

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

AI Technical Summary

Problems solved by technology

At present, ethylene is mainly produced industrially through steam thermal cracking reactions including ethane. This process usually requires a high temperature and strong endothermic reaction at 800-1100 ° C. Therefore, the process has the following problems: 1. High energy consumption
According to relevant literature (A Proceeding of the 8 th Ethylene Producer Conference: AIChE, New York) reported that the energy consumption of this process can reach 18.5MJ / kg-C 2 h 4 , and it is extremely difficult to further reduce
2. The composition of the product is complex
The cracking reaction is a complex free radical reaction, and there are many types of products, which will reduce the selectivity of ethylene (ethylene is generally not more than 80%) on the one hand, that is, reduce the utilization rate of raw materials, and increase the separation difficulty of the product on the other hand (especially is to produce H with a low boiling point 2 and methane)
3. Regular removal of carbon deposits is required
The high temperature reaction will cause carbon deposits on the pipe wall, and it is necessary to stop the car regularly to remove the carbon deposits, which will inevitably affect the production efficiency
4. High equipment investment
According to our early research results, the Mo-V-Te-Nb-O catalyst itself is relatively stable under mild reaction conditions in the oxidation of ethane to ethylene, but it is relatively stable when the reaction conditions are relatively severe (such as high space velocity and high temperature acceleration). pressure, etc.), the catalyst performance may gradually decrease due to the sharp increase in hot spot temperature. The reason may be that Te in the active component is easier to be reduced and precipitated when the hot spot temperature is higher. Changes in composition and structure, and ultimately affect the performance of the catalyst in the oxidation of ethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The Mo-V-Te-Nb-O catalyst (catalytically active component (CN101612564) is prepared by a temperature-programmed hydrothermal synthesis method. The steps include: firstly weighing the proportions of ammonium molybdate, vanadyl sulfate, telluric acid and niobium oxalate, respectively. Dissolve in hot deionized water, heat each for 30 minutes, slowly mix each solution together, continue stirring for 10 minutes, transfer it to a stainless steel tube synthesis kettle, and raise the temperature from room temperature to 10°C / min. To 190 ℃, after being incubated for 20h, it is naturally lowered to room temperature, then taken out, filtered, and dried. The obtained black solid is ground and placed in a roasting container, and is raised to 300 ℃ from room temperature with a heating rate of 3 ℃ / min from room temperature and insulated After 2 hours (atmosphere is air), then rise to 600 DEG C with the same heating rate and continue to keep the temperature for 2 hours (atmosphere is n...

Embodiment 2

[0038] The Mo-V-Te-Nb-O catalyst was prepared according to the method of Example 1.

[0039] Take 1 g of the Mo-V-Te-Nb-O catalyst prepared by 20-30 mesh for the selective oxidation 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 3 atm (3 atmospheres). The reaction was continued for 900 hours, and the reaction results are listed in Table 2. The results showed that under the more severe reaction conditions, the catalyst activity decreased significantly with time, and the ethane conversion rate decreased by about 26.8% within 900 hours.

[0040] Table 2

[0041]

[0042]

Embodiment 3

[0044] Refer to the preparation method of Example 1, and add 30% Alpha-Al in the preparation process 2 O 3 , the Mo-V-Te-Nb-O catalyst composition of this example was prepared.

[0045] 1 g of 20-30 mesh catalyst composition prepared above was used for the selective oxidation of ethane, and the reaction conditions were the same as those in Example 2. The reaction was continued for 900 hours, and the reaction results are listed in Table 3. The results show that Al 2 O 3 The addition of the active component is beneficial to stabilize the performance of the catalyst. Even if the reaction conditions are harsh, the ethane conversion rate drops by about 15.6% within 900 hours, which obviously inhibits or delays the decline of the catalyst performance.

[0046] table 3

[0047]

[0048]

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Abstract

The invention discloses a molybdenum vanadium tellurium niobium composite catalyst. The composite catalyst is composed of a molybdenum vanadium tellurium niobium catalyst and a stabilizer, and the stabilizer is SiC. According to the composite catalyst provided by the invention, based on previous work, the SiC with catalytic stabilization functions is creatively introduced, so that the catalyst canbe stabilized under severe reaction conditions, and the production costs of the catalyst are significantly reduced.

Description

technical field [0001] The present invention relates to the reaction of preparing ethylene by oxidation of ethane, especially to the catalyst in the reaction. Background technique [0002] Ethylene is the basic raw material of petrochemical industry and a pillar industry of the national economy. At present, 75% of petrochemical products are produced from ethylene; ethylene production has become an important symbol to measure the level of a country's petrochemical industry. By the end of 2015, the annual production capacity of ethylene in my country was 21.19 million tons, and the output was as high as 19.99 million tons. At present, ethylene is mainly industrially produced by steam thermal cracking reaction including ethane. This process usually requires a high temperature and strong endothermic reaction at 800-1100 °C. Therefore, the process has the following problems: 1. High energy consumption. According to the relevant literature (A Proceeding of the 8 th EthyleneProd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/224C07C5/333C07C11/04
CPCB01J27/224C07C5/3332C07C11/04Y02P20/52
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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