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Molybdenum-vanadium-tellurium-niobium catalyst composition

A catalyst and composition technology, applied in the direction of catalyst, hydrocarbon, catalyst protection, etc., can solve the problems of catalyst performance decline, catalyst composition and structure change, affecting catalyst performance, etc.

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

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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 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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  • Molybdenum-vanadium-tellurium-niobium catalyst composition
  • Molybdenum-vanadium-tellurium-niobium catalyst composition
  • Molybdenum-vanadium-tellurium-niobium catalyst composition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The Mo-V-Te-Nb-O catalyst (catalytically active component (CN101612564)) was prepared by the temperature-programmed hydrothermal synthesis method. The steps include: first weighing the proportions of ammonium molybdate, vanadyl sulfate, telluric acid and niobium oxalate respectively Dissolve in hot deionized water. After heating each for 30 minutes, slowly mix each solution together, continue stirring for 10 minutes, then transfer it to a stainless steel tube synthesis kettle, and raise it from room temperature at a heating rate of 10°C / min. To 190℃, keep it for 20h, then cool to room temperature naturally, then take it out, filter, and dry. Grind the obtained black solid and place it in a roasting vessel, raise it from room temperature to 300℃ at a heating rate of 3℃ / min and keep it warm After 2 hours (atmosphere is air), the temperature is increased to 600°C at the same heating rate and kept for 2 hours (atmosphere is nitrogen) and the temperature is naturally cooled do...

Embodiment 2

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

[0039] Take 1g of the Mo-V-Te-Nb-O catalyst prepared from 20-30 mesh 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 reaction volume 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 lasted for 900 hours, and the results are listed in Table 2. The results showed that under relatively 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 external mixing method during the preparation process 2 O 3 , The Mo-V-Te-Nb-O catalyst composition of this example was prepared.

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

[0046] table 3

[0047]

[0048]

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Abstract

The invention discloses a molybdenum-vanadium-tellurium-niobium catalyst composition. The composition is a mixture consisting of a molybdenum-vanadium-tellurium-niobium catalyst and a stabilizer. Thestabilizer is SiO2 or a mixture of SiO2 and SiC in any ratios. Based on previous work, the stabilizer with catalysis stabilizing effect is creatively introduced, can stabilize the catalyst under harshreaction conditions and significantly reduces the production cost of the catalyst.

Description

Technical field [0001] The present invention relates to a reaction for preparing ethylene by oxidation of ethane, and in particular to a catalyst in the reaction. Background technique [0002] In the petrochemical field, the production technology route of ethylene has always been one of the hot spots of R&D personnel. Introduce oxidant (such as O 2 (Or Air, etc.) to make the ethylene dehydrogenation reaction change from a strong endothermic reaction to a simple exothermic reaction has become one of the ideas of the majority of scientific researchers. According to literature [Chem. Week, 137(4), 36, 1985], the energy consumption of this process can be reduced by 20% to 30%. However, the process thermodynamically supports the deep oxidation product CO 2 In this way, how to improve the selectivity of ethylene has become the core technical problem. As early as 1981, U.S. Patent No. 4,250,346 disclosed a Mo-V-Nb-O catalyst used in the ethane oxidation reaction. The ethylene selectiv...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J27/224B01J33/00C07C5/48C07C11/04
CPCB01J27/0576B01J27/224B01J33/00C07C5/48C07C2527/057C07C2527/224C07C11/04Y02P20/52
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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