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High Dispersing palladium catalyst prepared by lamellar precursor and preparation method thererof

A palladium catalyst, highly dispersed technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that the active components of the catalyst cannot be fully utilized, the economy is not dominant, and the strength of the catalyst is not high. problem, to achieve the effect of excellent selectivity, high activity and long life

Inactive Publication Date: 2004-03-24
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 catalysts are all unsupported catalysts, the strength of this type of catalyst is not high, and the active components inside the catalyst cannot be fully utilized, which is not economically advantageous.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 35.610g (0.8903mol) NaOH and 28.279g (0.2668mol) NaOH 2 CO 3 Dissolve in 2000ml of water to make a mixed alkali solution, and 1000g of spherical δ-Al with a diameter of φ2-3mm 2 o 3The carrier is immersed in the above solution, and the water is gradually evaporated under constant stirring, so that the mixed alkali enters the pores of the carrier to fully activate the aluminum on the surface of the carrier, and then dried at 120°C to constant weight. 3.330g (0.01878mol) PdCl 2 and 50.358 g (0.2480 mol) of MgCl 2 ·6H 2 O was dissolved in 2000ml water to form a mixed salt solution, and the above alkali-activated Al 2 o 3 The carrier is immersed in the mixed salt solution for 2 hours so that all the salts in it enter the pores of the carrier, crystallize at 100°C for 10 hours after the immersion solution, and wash with deionized water until neutral after pouring off the residual liquid. Dry it to constant weight, put it in a muffle furnace and bake it at 500°C for 12...

Embodiment 2

[0025] 44.842g (0.8008mol) KOH and 33.952g (0.3203mol) Na 2 CO 3 Dissolve in 2000ml of water to make a mixed alkali solution, add 1000g of Al with a diameter of φ2.8mm and an average length of 5mm in the mixed crystal form of θ and α 2 o 3 The carrier is impregnated in the above solution, in which α crystal form accounts for 8%. The water is gradually evaporated under continuous stirring, so that the mixed alkali enters the pores of the carrier to fully activate the aluminum on the surface of the carrier, and then dried to constant weight. 4.327g (0.01878mol) Pd(NO 3 ) 2 and 61.122g (0.2480mol) MgSO 4 ·7H 2 O was dissolved in 2000ml water to make a mixed salt solution, and the above-mentioned alkali-activated strip Al 2 o 3 The carrier is immersed in the mixed salt solution for 6 hours so that all the salts in it enter the pores of the carrier, crystallize at 80°C for 18 hours after the immersion solution, and wash with deionized water until neutral after pouring off t...

Embodiment 3

[0028] 64.025g (1.6008mol) NaOH and 70.6975g (0.6670mol) NaOH 2 CO 3 Dissolve in 2000ml of water to make a mixed alkali solution, and 1000g of spherical δ-Al with a diameter of φ2-3mm 2 o 3 The carrier is immersed in the above solution, and the water is gradually evaporated under continuous stirring, and then dried to constant weight. 10.818g (0.04695mol) Pd(NO 3 ) 2 and 125.895g (0.6200mol) of MgCl 2 ·6H 2 O was dissolved in 2000ml water to form a mixed salt solution, and the above alkali-activated Al 2 o 3 The carrier is immersed in the mixed salt solution for 8 hours to allow all the salts to enter the pores of the carrier, crystallize in the soaking solution at 100°C for 6 hours, pour off the residual liquid and dry at 100°C to constant weight. The catalyst precursor with palladium-containing hydrotalcite grown in the pores was placed in a muffle furnace and calcined at 450°C for 6 hours, and then heated at 230°C with H at a ratio of 0.2:10. 2 / N 2 The mixed gas ...

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Abstract

The present invention provides a new palladium catalyst and its preparation method. Said method includes the following steps: firstly, in situ synthesizing hydrotalcite lamellar precursor body containing palladium in carrier surface layer hole, then roasting at higher temp. to convert the lamellar precursor body into correspondent composite metal oxide, and using hydrogen gas to make reduction treatment so as to obtain the loaded type high-dispersion catalyst in which the palladium is highly dispersed into the surface of internal hole of the carrier. Said catalyst mainly is used in antraquinone hydrogenation process for preparing hydrogen peroxide by means of antraquinone method.

Description

technical field [0001] The invention relates to a loaded highly dispersed palladium catalyst prepared from a layered precursor and a preparation method thereof. The catalyst is mainly used in the hydrogenation process of anthraquinone or anthraquinone derivatives in the preparation of hydrogen peroxide by an anthraquinone method. Applied to other hydrogenation catalytic processes. Background technique [0002] The catalyst used in the process of preparing hydrogen peroxide by the anthraquinone method is mainly a supported palladium catalyst. At present, the preparation method of the supported catalyst used in industry generally adopts impregnation. Described in USP.6126914 and USP.5853693 with SiO 2 As a carrier, the method for preparing an anthraquinone hydrogenation catalyst by supporting metal palladium, due to SiO 2 The pore size of the carrier is small and the active component and the carrier cannot be firmly combined, so the catalytic performance cannot be fully exer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/00B01J23/44B01J37/025
CPCB01J23/007B01J23/44
Inventor 段雪李殿卿张法智
Owner BEIJING UNIV OF CHEM TECH
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