Safe porous nickel catalyst activity recovering method

A technology of activity recovery and catalyst, which is applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst structure change and the difficulty of realizing the activity recovery method, and achieve easy industrial scale-up, The effect of safe operation, easy storage and transportation

Pending Publication Date: 2021-11-16
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the addition of the oxidizing agent leads to serious changes in the structure of the catalyst after oxidation, and the activity recovery after reduction can only restore 50% of the activity.
In addition, the surface structure and composition of Raney nickel are fundamentally different from those of safe porous nickel catalysts, and common methods of activity recovery are difficult to achieve

Method used

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  • Safe porous nickel catalyst activity recovering method
  • Safe porous nickel catalyst activity recovering method

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Experimental program
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Effect test

Embodiment 1

[0014] With different ratios of nickel and aluminum raw materials, it is smelted and crushed into 200-400 mesh metal powder (average particle size 50μm), and finally it is exfoliated by 0.5M NaOH to form a safe porous nickel catalyst. It was directly applied to evaluate the hydrogenation performance of phenylacetylene at room temperature and pressure, and the reaction performance is shown in Table 1.

[0015] Table 1

[0016]

Embodiment 2

[0018] Select No. 1 catalyst, after vacuum drying, carry out the activity recovery experiment of different conditions, after recovery, carry out the hydrogenation performance evaluation of phenylacetylene at normal temperature and pressure, the reaction performance and activity recovery rate are as shown in Table 2 (after drying, after experiment , before the activity recovers, the conversion efficiency TOF of phenylacetylene is 0.4h -1 , Styrene selectivity 90.2%). The activity recovery rate is the ratio of the reaction performance data (Table 2 TOF) after the activity recovery treatment to the reaction performance data (Table 1 TOF) directly applied.

[0019] Table 2

[0020]

Embodiment 3

[0022] The No. 1 safety porous nickel catalyst prepared above is applied to the selective hydrogenation reaction of 1,4-butynediol at normal temperature and pressure (the concentration of 1,4-butynediol is 1wt%, water is a solvent, and the reaction 4h), the conversion rate is 72.6%, and the selectivity to 1,4-butenediol is 92.8%. If it is dried, the H 2 The conversion rate of 1,4-butynediol can reach 71.1% and the recovery rate of activity can reach 98% after the mixture of reduction at 400°C and 0.01M NaOH alkali washing for activation under atmosphere.

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Abstract

The invention provides a safe porous nickel catalyst activity recovering method, which comprises the following steps of: drying the safe porous nickel catalyst obtained by phase stripping, and recovering the activity of the safe porous nickel catalyst by adopting a gas-phase reduction or / and liquid-phase cleaning mode, so that the performance of the safe porous nickel catalyst is equivalent to that of an initial catalyst. Compared with a traditional Raney nickel catalyst, operation is safe, storage and transportation are easy, the activity recovery method is simple in process, and industrial amplification is easy.

Description

technical field [0001] The invention belongs to the technical field of new material preparation and relates to a method for restoring the activity of a safe porous nickel catalyst. Background technique [0002] Although the industrial Raney nickel (Raney Ni) catalyst has high activity and is widely used, it is easy to burn in the air, so it needs to be stored in a liquid seal, and there are safety hazards in the operation process, and the transportation cost increases. Therefore, the development of a safe porous nickel catalyst is to important. [0003] The applicant disclosed a safe porous nickel catalyst in the patent CN202110310290.X. The catalyst exhibits significantly better performance than traditional Raney nickel in many reactions. However, after the catalyst is dried, its catalytic activity is greatly reduced, so it is necessary to develop a method to restore the activity. [0004] In order to facilitate storage, industrial Raney nickel catalysts are often treated...

Claims

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Application Information

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IPC IPC(8): B01J38/60B01J38/64B01J38/10B01J38/04B01J23/755B01J23/94B01J35/02B01J35/10C07C29/17C07C33/035
CPCB01J38/60B01J23/94B01J38/64B01J23/755B01J23/002B01J38/10B01J38/04C07C29/17B01J35/40B01J35/613B01J35/647C07C33/035Y02P20/584Y02P10/20
Inventor 肖子辉阚洪寅刘江云印会鸣丁轶
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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