Packaging method of Ni@ZSM-5 bifunctional catalyst

A dual-function catalyst, ZSM-5 technology, applied in catalysts, molecular sieve catalysts, carbon compound catalysts, etc., to achieve the effect of broadening the scope of application, short process, and fast and simple packaging method

Active Publication Date: 2020-06-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to realize the dispersion of metallic Ni particles is a very difficult challenge

Method used

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  • Packaging method of Ni@ZSM-5 bifunctional catalyst
  • Packaging method of Ni@ZSM-5 bifunctional catalyst
  • Packaging method of Ni@ZSM-5 bifunctional catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A Ni@ZSM-5-25 bifunctional catalyst encapsulation method includes the following steps:

[0063] This embodiment adopts SiO with FAU structure 2 / Al 2 o 3 The HY molecular sieve of =5.0 is the aluminum source;

[0064] solid silica (SiO 2 ), SiO 2 / Al 2 o 3 =5 HY molecular sieve, Ni-ethylenediamine complex solution, tetrapropyl ammonium hydroxide (TAPOH), and deionized water (H 2 O) mix homogeneously, obtain mixed material, the mol ratio of each raw material in described mixed material is: SiO 2 / Al 2 o 3 =25, TAPOH / SiO 2 =0.5,H 2 O / SiO 2 =10, Ni element / SiO 2 =0.02;

[0065] Transfer the mixed material into a crystallization kettle at 170°C for 12 hours, take it out, filter it, and dry it; then bake it at 550°C for 5 hours; finally, in a hydrogen atmosphere, reduce it at 500°C for 8 hours to obtain Ni@ZSM-5 -25 bifunctional catalyst named A-1.

[0066] The XRD analysis of the Ni@ZSM-5-25 bifunctional catalyst obtained in this example is as follows figu...

Embodiment 2

[0068] A Ni@ZSM-5-50 bifunctional catalyst encapsulation method comprises the following steps:

[0069] This embodiment adopts SiO with FAU structure 2 / Al 2 o 3 The HX molecular sieve of =2.0 is aluminum source;

[0070] Mix white carbon black, HX molecular sieve, Ni-ethylenediamine complex solution, tetrapropyl ammonium hydroxide and deionized water evenly to obtain a mixed material. The molar ratio of each raw material in the mixed material is: SiO 2 / Al 2 o 3 =50, TAPOH / SiO 2 =0.3,H 2 O / SiO 2 =30, Ni element / SiO 2 =0.02;

[0071] Transfer the mixed material into a crystallization kettle at 170°C for crystallization treatment for 12 hours, take it out, filter it, and dry it; then bake it at 550°C for 5 hours; finally, in a hydrogen atmosphere, reduce it at 500°C for 4 hours to obtain Ni@ZSM-5 -50 bifunctional catalyst, named A-2.

[0072] The XRD of the Ni@ZSM-5-50 bifunctional catalyst obtained in this example observed the characteristic diffraction peak of ZSM-...

Embodiment 3

[0074] A method for encapsulating a Ni@ZSM-5-100 bifunctional catalyst comprises the following steps:

[0075] This embodiment adopts SiO with FAU structure 2 / Al 2 o 3 The NiX molecular sieve of =2.0 is as aluminum source and nickel source;

[0076] Mix and stir white carbon black, NiX molecular sieve, tetrapropylammonium hydroxide and deionized water evenly to obtain a mixed material. The molar ratio of each raw material in the mixed material is: SiO 2 / Al 2 o 3 =100, TAPOH / SiO 2 =0.2,H 2 O / SiO 2 =45, Ni element / SiO 2 =0.02;

[0077]Transfer the mixed material into a crystallization tank with a crystallization treatment at 170°C for 12 hours, take it out, filter it, and dry it; then bake it at 550°C for 5 hours; finally, in a hydrogen atmosphere, reduce it at 500°C for 4 hours to obtain Ni@ZSM - 5-100 bifunctional catalyst named A-3.

[0078] The XRD of the Ni@ZSM-5-100 bifunctional catalyst obtained in this example is as follows figure 2 Shown in (A-3): observe...

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Abstract

The invention relates to a packaging method of an Ni@ZSM-5 bifunctional catalyst. The packaging method comprises the following step: with an FAU structure molecular sieve as an aluminum source and a metal Ni precursor as a Ni source, packaging metal nickel in the preparation process of a ZSM-5 molecular sieve through crystal transformation so as to obtain the Ni@ZSM-5 bifunctional catalyst. The Ni@ZSM-5 packaged catalyst obtained by using the packaging method has the double functions of metal hydrogenation and molecular sieve acid catalysis, so the application range of the packaged catalyst isremarkably widened; the packaged metal Ni nanoparticles are uniform in distribution and uniform in particle size; and in addition, the Ni@ZSM-5 bifunctional catalyst is packaged in a sodium-free system, a subsequent ion exchange step does not exist, and the packaging method is rapid, simple and convenient in process, short in flow, low in cost and easy for industrial operation.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a method for encapsulating a Ni@ZSM-5 dual-function catalyst. Background technique [0002] In recent years, combining the advantages of the properties of metals and molecular sieves, the development of metal / zeolite bifunctional catalysts has become a research hotspot, and it is of great significance to be applied to important reactions such as biomass catalytic conversion, phenolic catalytic deoxygenation, and catalytic reforming. Prior art reports show that the use of impregnation, deposition and ion exchange methods to prepare metal / molecular sieve dual-function catalysts is likely to cause problems such as uneven dispersion of metal particles on the molecular sieve carrier, uneven particle size, easy agglomeration and loss, etc., resulting in Catalyst stability is poor. [0003] In recent years, the method of encapsulating metals with molecular sieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J35/02C07C1/20C10G3/00C07C15/04
CPCB01J29/46B01J35/023B01J2229/186C07C1/20C07C2529/46C10G3/49C10G2400/30C07C15/04Y02P20/52Y02P30/20
Inventor 曹宏斌石艳春谢勇冰
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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