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Noble metal catalyst based on spherical silicon-containing alumina, and preparation method thereof

A silicon-alumina-based noble metal technology, which is applied in the field of spherical silicon-containing alumina-based noble metal catalysts and their preparation, can solve problems such as mass transfer performance limitations, achieve high hydrogenation efficiency, increase the dispersion of noble metals, and increase the mass transfer rate. Effect

Inactive Publication Date: 2009-09-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prepared carrier is mainly strip-shaped, and the mass transfer performance is limited to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step A. Dissolving 30 g of aluminum powder with an average particle size of 50 μm in 250 g of 10% hydrochloric acid to prepare aluminum sol.

[0038] Step B. Add 8.3g NaSiO 3 9H 2 O was dissolved in 55g of deionized water, ion-exchanged through a 001×7 (732) strongly acidic styrene-based cation exchange resin column to obtain an acidic silica sol, and then 35g of hexamethylenetetramine was added to the acidic silica sol to fully dissolve.

[0039] Step C. Fully mix the above two solutions, and drop them into the vacuum pump oil at 70°C with a droplet-type dispersing dropper that makes the particle size of the spherical carrier reach about 2 mm. The formed pellets were separated from the oil and aged at 130°C for 5 hours.

[0040] Step D. Wash the obtained product, dry at 140°C for 10 hours, and bake at 900-1000°C for 4 hours to obtain SiO 2 The spherical alumina support with a content of 2% has a particle size of 2.2 mm.

[0041] Step E. Weigh 10 g of the spherical ...

Embodiment 2

[0045] Steps A and D are the same as in Example 1.

[0046] In step B, 14.1 g Na 2 SiO 3 ·6H 2 O was dissolved in 70g deionized water to form a solution to prepare acidic silica sol. Adjust the size of the dispersing dripper in step C. Others are with embodiment 1. Finally get SiO 2 5% spherical Al 2 o 3 The carrier has a particle size of 2.5 mm.

[0047] In step E, 10 g of the carrier was dissolved in 20 ml of Na with a concentration of 0.0142 mol / L 2 PdCl 4 After immersing in the solution for 3 hours, a catalyst with a palladium content of 0.3% was finally obtained.

[0048] Through BET and palladium layer thickness test, the specific surface of the catalyst is 127.31m 2 / g, the pore volume is 0.8978cm 3 / g, the average pore diameter is 28.21nm, and the palladium layer thickness is 193μm.

[0049] The anthraquinone hydrogenation efficiency of this catalyst is evaluated with the condition of embodiment 1, and its hydrogenation efficiency as a result is 9.3g H 2 ...

Embodiment 3

[0051] Steps A and D are the same as in Example 1.

[0052] In step B, 23.3 g Na 2 SiO 3 ·6H 2 O was dissolved in 90g deionized water to form a solution; in step C, the size of the dispersed dripper was adjusted to finally obtain SiO 2 8% spherical Al 2 o 3 The carrier has a particle size of 2.8 mm.

[0053] In step E, 10 g of the carrier was dissolved in 25 ml of Na with a concentration of 0.0113 mol / L 2 PdCl 4 After 4 hours of immersion in the solution, a catalyst with a palladium content of 0.3% was finally obtained.

[0054] Through BET and palladium layer thickness test, the specific surface of the catalyst is 152.53m 2 / g pore volume is 1.279cm 3 The average pore diameter per g is 33.54 nm, and the thickness of the palladium layer is 234 μm.

[0055] The anthraquinone hydrogenation efficiency of this catalyst is evaluated with the condition of embodiment 1, and its hydrogenation efficiency as a result is 10.1g H 2 o 2 / L.

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Abstract

The invention provides a noble metal catalyst based on spherical silicon-containing alumina, and a preparation method thereof. The noble metal catalyst based on silicon-containing alumina takes the spherical silicon-containing alumina as a carrier, and loaded active components can be nickel, platinum, palladium, ruthenium, rhodium or iridium and other noble metal. The adopted spherical silicon-containing alumina carrier is spherical particles of which the particle size is 0.5 to 5 millimeters, wherein the SiO2 content is 1 to 20 percent by weight, and the crystal form of alumina is gamma, delta, eta or theta. The catalyst is characterized in that the active components are distributed in a surface layer of the carrier with 5 to 400 mu m, and an active layer is reasonable in thickness distribution and belongs to a high-dispersion thin-shell type. The catalyst has the advantages of high activity, good selectivity and good stability, is beneficial to bed mass transfer and recovery and long in life span, and is a novel hydrogenation catalyst applicable to the development of a hydrogenation production process.

Description

technical field [0001] The invention relates to a series of silicon-containing alumina-based noble metal catalysts and a preparation method thereof. The series of silicon-containing alumina-based noble metal catalysts can be used in the hydrogenation process of anthraquinone or anthraquinone derivatives in the preparation of hydrogen peroxide by anthraquinone method, and can also be used in Hydrofining, selective hydrogenation and other reaction processes in petrochemical and fine chemical production. Background technique [0002] As the active components of catalysts, noble metals have excellent catalytic properties, and thus have been widely used in industry. The resources of precious metals are limited and expensive. How to improve the utilization of precious metals in catalysts has become the focus of research at home and abroad. Catalysts loaded with precious metals are mostly used in fixed-bed hydrogenation processes, and the carrier also plays a very important role. ...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/42B01J23/46B01J23/755B01J35/08B01J37/04B01J37/02B01J37/30C07C29/145C07C35/40C10G45/00
Inventor 李殿卿王海艳林彦军
Owner BEIJING UNIV OF CHEM TECH
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