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Zsm-5 is the noble metal catalyst of carrier and its preparation method and application

A precious metal catalyst, ZSM-5 technology, applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., can solve problems such as the removal of hydrazine nitrate and hydroxylamine nitrate, achieve mild reaction conditions, facilitate vitrification solidification, high efficiency effect

Active Publication Date: 2022-06-28
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide ZSM-5 as a carrier noble metal catalyst and its preparation method and application, thereby solving the problem of safe removal of hydrazine nitrate and hydroxylamine nitrate in the existing spent fuel reprocessing waste liquid

Method used

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  • Zsm-5 is the noble metal catalyst of carrier and its preparation method and application
  • Zsm-5 is the noble metal catalyst of carrier and its preparation method and application

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preparation example Construction

[0044] Further, the above-mentioned preparation method of the noble metal catalyst supported by ZSM-5 comprises the following steps:

[0045] 1) Put Na 2 O, Al 2 O 3 , SiO 2 , H 2O, n-butylamine are proportioned in a molar ratio of 10.41:0.5:105:3870:36.7, mixed evenly under stirring, and the Na-type ZSM-5 original powder is obtained by crystallization;

[0046] 2) Mix the Na-type ZSM-5 original powder and 0.1 mol / L ammonium nitrate solution in a mass ratio of 1:2 to prepare the H-type ZSM-5 molecular sieve powder;

[0047] The H-type ZSM-5 molecular sieve powder is shaped to obtain shaped molecular sieve;

[0048] 3) First, soak the carrier in a solution containing a noble metal active precursor, so that the noble metal and the carrier are fully contacted to be adsorbed into the pores of the carrier.

[0049] Specifically: Disperse the shaped molecular sieve with a mass of M1 in deionized water with a volume of L1, and under stirring conditions, according to the differe...

Embodiment 1

[0085] will Na 2 O, Al 2 O 3 , SiO 2 , H 2 O, n-butylamine carry out proportioning in molar ratio of 10.41: 0.5: 105: 3870: 36.7, mix well, adjust the pH of the system with dilute sulfuric acid to 11, transfer into the crystallization kettle, and crystallize at 160 ° C for 24 hours .

[0086] After crystallization, carry out suction filtration and washing, and dry at 110 °C for 4 hours to obtain Na-type ZSM-5 original powder; add 500 g of Na-type ZSM-5 original powder to 1 liter of 0.1 mol / L ammonium nitrate solution, 80 °C Heating and stirring for 20h, filtering, washing, drying, and calcining at 500°C for 6h to obtain H-type ZSM-5 molecular sieve.

[0087] On a small rolling ball method, silica sol with a mass concentration of 25% was used as a binder, and ZSM-5 molecular sieve balls with a particle size of 20 meshes were prepared by rolling balls, and the temperature was raised to 500 °C at a heating rate of 5 °C / min , and kept roasting for 6h. Disperse 15g ZSM-5 mol...

Embodiment 2

[0090] will Na 2 O, Al 2 O 3 , SiO 2 , H 2 O, n-butylamine carry out proportioning in molar ratio of 10.41:0.5:105:3870:36.7, mix well, adjust the pH of the system to 11 with dilute sulfuric acid, transfer into the crystallization kettle, and crystallize at 175 ° C for 24 hours . After crystallization, carry out suction filtration and washing, and dry at 120 °C for 4 hours to obtain Na-type ZSM-5 original powder; add 500 g of Na-type ZSM-5 original powder to 1 liter of 0.1 mol / L ammonium nitrate solution, at 90 °C Heating and stirring for 20h, filtering, washing, drying, and calcining at 550°C for 6h to obtain H-type ZSM-5 molecular sieve.

[0091] On a small rolling ball method, silica sol with a mass concentration of 28% was used as a binder, and ZSM-5 molecular sieve balls with a particle size of 40 meshes were prepared by rolling balls, and the temperature was raised to 550 °C at a heating rate of 5 °C / min , and kept roasting for 6h. Disperse 15g ZSM-5 molecular sie...

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Abstract

The invention belongs to the technical field of nuclear power waste treatment and environmental protection, and specifically relates to a precious metal catalyst with ZSM-5 as a carrier, a preparation method and application thereof. The invention discloses a noble metal catalyst with ZSM-5 as a carrier. The catalyst carrier is an H-type ZSM-5 molecular sieve, the active component is one of metal ruthenium and platinum, and the mass fraction of the active component in the catalyst is 3% to 10% %. Further, the above-mentioned ZSM-5 is a supported noble metal catalyst, and the H-type ZSM-5 molecular sieve is an organic amine sodium ion zeolite molecular sieve. The invention adopts catalytic decomposition method to remove hydrazine nitrate dangerous compounds in nitric acid waste liquid. Compared with the traditional method of adding oxidant, the method is cleaner, more environmentally friendly, has no potential safety hazard, and is more economical than the method of adding oxidant.

Description

technical field [0001] The invention belongs to the technical field of nuclear power waste treatment and environmental protection, and in particular relates to a noble metal catalyst with ZSM-5 as a carrier and a preparation method and application thereof. Background technique [0002] Nuclear power is a green, low-carbon and clean energy with mature technology, which is one of the most realistic and feasible technical methods for human beings to solve energy problems. However, nuclear power produces a large amount of highly radioactive waste—spent fuel, and its safety is one of the main factors restricting the large-scale promotion and application of nuclear power. [0003] As we all know, the nuclear fuel utilization rate of nuclear power reactors is not high at present, and the spent fuel contains a large amount of unconverted uranium and value-added nuclides, which is an important nuclear element resource pool. Major nuclear power countries, including China, mostly adopt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/44B01J37/00B01J37/02B01J37/08B01J37/18G21F9/06G21F9/20
CPCB01J29/44B01J37/0018B01J37/0201B01J37/088B01J37/18G21F9/06G21F9/20B01J2229/186
Inventor 左臣李保乐郑卫芳晏太红白杨朱浩玮
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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