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Pd-based alloy packaged molecular sieve catalyst, as well as preparation method and application thereof

A molecular sieve and catalyst technology, which is applied in the field of molecular sieve catalyst and preparation of encapsulated Pd-based alloys, to achieve the effects of avoiding runaway temperature, high ethylene selectivity, and shortening the diffusion distance

Active Publication Date: 2021-03-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, industrial catalysts can achieve 100% conversion rate of acetylene, but the selectivity of ethylene is about 80%, so there is a very large room for improvement. The index of ethylene selectivity can greatly affect the economic benefits of this process, which has a very large improvement space

Method used

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  • Pd-based alloy packaged molecular sieve catalyst, as well as preparation method and application thereof
  • Pd-based alloy packaged molecular sieve catalyst, as well as preparation method and application thereof
  • Pd-based alloy packaged molecular sieve catalyst, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Add 0.0181mol of aluminum source to 8g of water, mix uniformly to form solution A, add 0.0181mol of silicon source to 8g of water, mix uniformly to form solution B; quickly add 0.0816mol of sodium hydroxide to the solution In A, stir well, stir at room temperature for 30 minutes to form mixed solution C; add solution B dropwise to mixed solution C, and stir at room temperature for 30 minutes to form uniform mixed solution D; transfer solution D to 100mL water Heat the kettle and place it in an oven at 100°C for static crystallization for 12 hours; centrifugally wash the product with deionized water until the pH is neutral, dry at 100°C for 12 hours, and bake in a muffle furnace at 300°C for 4 hours (2°C / min heating rate) , obtain sodalite molecular sieve (SOD) powder;

[0046] (2) Palladium nitrate powder and silver nitrate powder are dissolved in deionized water adding a small amount of dilute nitric acid, and are prepared as a solution; the sodalite molecular siev...

Embodiment 2

[0070] The method of Example 1 was used for preparation and reaction, the only difference being that the loading of metal palladium in step (2) was 0.4wt%.

Embodiment 3

[0072] Preparation and reaction were carried out by the method of Example 1, the only difference being that the loading of metal palladium in step (2) was 0.1wt%.

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Abstract

The invention belongs to the technical field of molecular sieve catalysts, and discloses a Pd-based alloy packaged molecular sieve catalyst, a preparation method and applications thereof. The molecular sieve catalyst comprises a sodalite molecular sieve, and PdM nano-alloy particles are packaged in the sodalite molecular sieve; the preparation method comprises the following steps: firstly preparing a sodalite molecular sieve, then impregnating and loading Pd metal and an M metal precursor, roasting and reducing to form a molecular sieve catalyst impregnated and loaded with nano alloy particles; then uniformly mixing with a silica-alumina sol solution, uniformly stirring and mixing the solution, evaporating the solution to dryness, then adding ethylene glycol, grinding the mixture into uniform paste, carrying out hydrothermal reaction, and cooling, washing, drying, roasting and reducing the reaction product to obtain the catalyst. The molecular sieve catalyst is applied to acetylene selective hydrogenation reaction, can avoid an excessive hydrogenation process, and has relatively high acetylene conversion rate and ethylene selectivity.

Description

technical field [0001] The invention belongs to the technical field of supported catalysts, and in particular relates to a molecular sieve catalyst encapsulating a Pd-based alloy, a preparation method and an application thereof. Background technique [0002] Ethylene is an important industrial basic raw material in a country, and it is mainly produced by pyrolysis of naphtha at this stage. However, industrial ethylene products usually contain 0.5-2% mole fraction of acetylene, and this part of acetylene will lead to a reduction in the life of the downstream catalyst for polyethylene synthesis, and the presence of acetylene will seriously reduce the purity of polyethylene products and affect the quality of polyethylene products. Therefore, effective measures must be taken to reduce the trace impurity acetylene in ethylene raw materials to below 5ppm. The process of selective hydrogenation of acetylene to ethylene by using a fixed-bed catalyst can not only remove acetylene, b...

Claims

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Application Information

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IPC IPC(8): B01J29/74B01J29/76C07C11/04C07C5/09C07C11/06C07C5/05C07C11/08
CPCB01J29/74B01J29/76C07C5/09C07C5/05C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 巩金龙王帅赵志坚裴春雷
Owner TIANJIN UNIV
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