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a ti 3+ Preparation of doped non-noble metal catalysts and their application in selective hydrogenation reactions

A non-precious metal, selective technology, applied in physical/chemical process catalysts, hydrogenation to hydrocarbons, bulk chemical production, etc., can solve the problems of high catalyst cost, short catalyst life, easy carbon deposition, etc., and achieve low cost and high cost. Conversion rate, high selectivity effect

Inactive Publication Date: 2017-08-15
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of easy carbon deposition, green oil generation, and short catalyst life have not been completely solved. At the same time, the cost of Pd-based catalysts is relatively high, leaving a lot of room for modification and improvement for subsequent research.

Method used

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  • a ti <sup>3+</sup> Preparation of doped non-noble metal catalysts and their application in selective hydrogenation reactions
  • a ti <sup>3+</sup> Preparation of doped non-noble metal catalysts and their application in selective hydrogenation reactions
  • a ti <sup>3+</sup> Preparation of doped non-noble metal catalysts and their application in selective hydrogenation reactions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 1g γ-Al 2 o 3 The nanotubes were dried in an oven at 100° C. for 2 hours, and set aside. Measure 0.3 g of butyl titanate and dissolve in 30 mL of a mixed solution of ethanol and toluene (volume ratio 1:1). The dried γ-Al 2o 3 The nanotubes were slowly added into the mixed solution of ethanol and toluene, and stirred at 20°C for 20 hours. Then centrifuge, discard the supernatant, and take the lower layer of sediment. The centrifuged product was dried in an oven at 100° C. for 4 hours, and then ground into powder. Finally, the obtained powder was placed in a tube furnace, and the temperature was programmed to rise to 500°C at a rate of 5°C / min in an air atmosphere. After calcination for 2 hours, it was cooled to room temperature, and then switched to 5% H 2 / N 2 Gas was heated up to 500°C at a rate of 10°C / min, and calcined for 2 hours to obtain Ti 3+ Doped non-noble metal hydrogenation catalysts. The composition and internal structure of the product were c...

Embodiment 2

[0047] Weigh 2g γ-Al 2 o 3 The nanotubes were dried in an oven at 120° C. for 2 hours, and set aside. Measure 0.6 g of butyl titanate and dissolve in 30 mL of a mixed solution of ethanol and toluene (volume ratio 1:1). The dried γ-Al 2 o 3 The nanotubes were slowly added into the mixed solution of ethanol and toluene, and stirred at 20° C. for 25 hours. Then centrifuge, discard the supernatant, and take the lower layer of sediment. The centrifuged product was dried in an oven at 120° C. for 6 hours, and then ground into powder. Finally, the obtained powder was placed in a tube furnace, and the temperature was programmed to rise to 400°C at a rate of 5°C / min in an air atmosphere, and after calcination for 4 hours, it was cooled to room temperature, and then switched to 5% H 2 / N 2 Ti 3+ Doped non-noble metal hydrogenation catalysts. The morphology of the product was characterized by high-power transmission electron microscopy, such as image 3 shown.

Embodiment 3

[0049] Weigh 1.6g γ-Al 2 o 3 The nanotubes were dried in an oven at 100°C for 3 hours, and set aside. Measure 0.55 g of butyl titanate and dissolve in 30 mL of a mixed solution of ethanol and toluene (volume ratio 1:1). The dried γ-Al 2 o 3 The nanotubes were slowly added into a mixed solution of ethanol and toluene, and stirred at 30° C. for 30 hours. Then centrifuge, discard the supernatant, and take the lower layer of sediment. The centrifuged product was dried in an oven at 100° C. for 4 hours, and then ground into powder. Finally, the obtained powder was placed in a tube furnace, and the temperature was programmed to rise to 400°C at a rate of 5°C / min in an air atmosphere. After calcination for 2 hours, it was cooled to room temperature, and then switched to 5% H 2 / N 2 Ti 3+ Doped non-noble metal hydrogenation catalysts. The morphology of the product was characterized by high-power transmission electron microscopy, such as Figure 4 shown.

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Abstract

The invention discloses preparation of a Ti3+ doped non-noble metal catalyst and application of the catalyst in selective hydrogenation reactions. The selective hydrogenation catalyst uses Ti3+ as an active component, and gamma-alumina nanotubes as carriers. The product provided by the invention can be used as a catalyst for preparing ethylene through acetylene selective hydrogenation, and noble metal does not need to be loaded, the catalytic activity and selectivity are both high, the cost is far lower than that of the industrial Pd-based noble metal catalysts. The invention also discloses a preparation method.

Description

technical field [0001] This invention relates to selective acetylene hydrogenation catalysts. Background technique [0002] Ethylene is an important raw material in the organic synthesis industry. At present, it is mainly prepared industrially by cracking naphtha or lower alkanes, and this process is usually accompanied by about 1% acetylene. The 1% or so of acetylene will poison the subsequent ethylene polymerization reaction, so it is necessary to reduce the content of acetylene in ethylene to below 5ppm. Therefore, the study of the selective hydrogenation of acetylene in the presence of a large amount of ethylene is a very important industrially valuable reaction. At present, the commonly used catalyst is a noble metal (such as Pd) supported catalyst, but this type of catalyst is not only expensive, but also has poor selectivity. The activity of the catalyst is greatly reduced, resulting in shortened catalyst life and even deactivation. [0003] In order to solve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C07C11/04C07C5/09
CPCY02P20/52
Inventor 丁维平蔡威盟杨杰吕建刚薛念华彭路明郭学锋章浩龙
Owner NANJING UNIV
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