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Method for preparing acetylene selective hydrogenation catalyst

A hydrogenation catalyst, selective technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the lack of controllable nanostructure of metal oxides, wide particle size distribution of Pd, and uneven distribution uniformity. In order to achieve the effect of rich catalyst structure, narrow size distribution, and high controllability of particle size

Active Publication Date: 2016-05-04
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the disadvantages of wide Pd particle size distribution, poor distribution uniformity, lack of controllable nanostructure of the metal oxide as the substrate and the like in the prior art, and proposes a Pd / metal oxide catalyst with a three-dimensional nanostructure. Preparation

Method used

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  • Method for preparing acetylene selective hydrogenation catalyst
  • Method for preparing acetylene selective hydrogenation catalyst
  • Method for preparing acetylene selective hydrogenation catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] This example provides a method for preparing a small-scale, highly dispersed Pd / metal oxide catalyst with a three-dimensional nanostructure. The specific steps are:

[0029] Step 1: Put 0.5g of MCM-41 molecular sieve carrier in a fixed bed, seal the reactor, feed nitrogen and adjust the pressure of the reactor to 130Pa, and heat the carrier to keep the temperature at 150°C. The structure of MCM-41 molecular sieve is shown in Figure 1.

[0030] Step 2: Perform a cycle of TiO on the carrier 2 Atomic layer deposition, a cycle includes the following four links:

[0031] 1) Inject Ti(OPr) into the reaction chamber 4 Saturating surface chemistry with the substrate and displacing surface functional groups;

[0032] 2) Clean unreacted Ti(OPr) with inert carrier gas 4 and by-products;

[0033] 3) Inject H into the reaction chamber 2 o 2 Surface reaction with the first reactive precursor adsorbed on the surface of the substrate to replace the surface functional groups agai...

Embodiment 2

[0045] This embodiment provides a method for preparing a small-scale, highly dispersed Pd / metal oxide catalyst with a three-dimensional nanostructure. The specific steps of the method are:

[0046] Step 1: Put 0.5g of MCM-41 molecular sieve carrier in a fixed bed, seal the reactor, feed nitrogen and adjust the pressure of the reactor to 150Pa, and heat the carrier to keep the temperature at 150°C.

[0047] Step 2: Perform a cycle of TiO on the carrier 2 Atomic layer deposition, a cycle includes the following four links:

[0048] 1) Inject Ti(OPr) into the reaction chamber 4 Saturating surface chemistry with the substrate and displacing surface functional groups;

[0049] 2) Clean unreacted Ti(OPr) with inert carrier gas 4 and by-products;

[0050] 3) Inject H into the reaction chamber 2 o 2 Surface reaction with the first reactive precursor adsorbed on the surface of the substrate to replace the surface functional groups again;

[0051] 4) Passing in an inert carrier ga...

Embodiment 3

[0062] This example provides a method for preparing a small-scale, highly dispersed Pd / metal oxide catalyst with a three-dimensional nanostructure. The specific steps are:

[0063] Step 1: Put 0.5g of MCM-41 molecular sieve carrier in a fixed bed, seal the reactor, feed nitrogen and adjust the pressure of the reactor to 150Pa, and heat the carrier to keep the temperature at 150°C.

[0064] Step 2: Perform a cycle of TiO on the carrier 2 Atomic layer deposition, a cycle includes the following four links:

[0065] 1) Inject Ti(OPr) into the reaction chamber 4 Saturating surface chemistry with the substrate and displacing surface functional groups;

[0066] 2) Clean unreacted Ti(OPr) with inert carrier gas 4 and by-products;

[0067] 3) Inject H into the reaction chamber 2 o 2 Surface reaction with the first reactive precursor adsorbed on the surface of the substrate to replace the surface functional groups again;

[0068] 4) Passing in an inert carrier gas to clean the un...

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Abstract

The invention discloses a method for preparing an acetylene selective hydrogenation catalyst. The method mainly overcomes the defects that in the prior art, Pd particle size distribution is wide, distribution uniformity is poor, and a metallic oxide serving as a substrate lacks a controllable nano structure. Firstly, a three-dimensional nano structure is provided through a mesoporous material, a metallic oxide is deposited on the structure, and a metallic oxide substrate with the three-dimensional nano structure same as the mesoporous material is obtained; then, by means of the atomic layer deposition, nano Pd metal particles are loaded and deposited on the surface of the metallic oxide substrate, and the loading amount of Pd and the metallic oxide can be adjusted according to different deposition period numbers. The catalyst prepared through the method is of the three-dimensional nano structure and large in specific surface area, the Pd metallic particles are high in dispersity, uniform in distribution, uniform in size and good in activity, selectivity and stability in the acetylene selective hydrogenation catalysis reaction. The method avoids the characteristics that metallic particle size distribution is wide and distribution is not uniform in the preparation process of an impregnation method and a chemical plating method.

Description

technical field [0001] The invention relates to a catalyst preparation method, in particular to a preparation method of an acetylene selective hydrogenation catalyst. Background technique [0002] Ethylene is a basic chemical raw material and an intermediate in the synthesis of many organic compounds. It is commonly used in the industry to prepare plastics, synthetic fibers, and organic solvents. Its output has become a symbol to measure the development level of a country's petrochemical industry. In the industrial production process of petroleum cracking to prepare ethylene, a small amount of acetylene will be produced. The existence of acetylene will seriously affect the performance of ethylene polymerization catalyst and reduce the quality of the product. Therefore, reducing the content of acetylene in an ethylene-rich environment is a very important part of the ethylene polymerization process. Common methods for removing acetylene include solvent absorption method, sel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J29/04B01J37/03B01J37/00
CPCB01J29/0325B01J29/043B01J37/00B01J37/035B01J2229/20B01J35/23
Inventor 冯昊黄钰秦利军惠龙飞李建国龚婷闫宁
Owner XIAN MODERN CHEM RES INST
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