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Packaged noble metal catalyst for liquid-phase catalytic hydrogenation reduction of Cr (VI) under neutral condition and preparation method and application thereof

A noble metal catalyst, liquid-phase catalysis technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of catalyst activity reduction, catalytic hydrogenation reduction Cr limitation, etc., to improve stability and increase The effect of recycling rate, efficient and fast removal or

Active Publication Date: 2020-10-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on Cr(VI) liquid phase hydrogenation reduction focuses on acidic conditions, because the precipitation of trivalent chromium under neutral conditions will cover the active sites of the catalyst, reducing the activity of the catalyst. Catalytic hydrogenation reduction of Cr(VI) is limited

Method used

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  • Packaged noble metal catalyst for liquid-phase catalytic hydrogenation reduction of Cr (VI) under neutral condition and preparation method and application thereof
  • Packaged noble metal catalyst for liquid-phase catalytic hydrogenation reduction of Cr (VI) under neutral condition and preparation method and application thereof
  • Packaged noble metal catalyst for liquid-phase catalytic hydrogenation reduction of Cr (VI) under neutral condition and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] An encapsulated noble metal catalyst for liquid-phase catalytic reduction of Cr(VI) under neutral conditions and its preparation, the catalyst is an encapsulated type in which platinum is dispersed in a nitrogen-ordered mesoporous carbon (N-CMK-3) framework Pt@N-CMK-3, the platinum loading is 0.5-2.0wt% (mass percentage);

[0049] Prepare described encapsulated noble metal catalyst according to the following steps:

[0050] ① Functionalization of SBA-15 with ammonium persulfate: Use hydrochloric acid solution with a concentration of 0.2g / mL ammonium persulfate and 1.0g of SBA-15 to impregnate in equal volumes, stir and dry at 60-80°C to obtain functionalization The templating agent SBA-15;

[0051] ② Add a certain amount of chloroplatinic acid dropwise to the hydrochloric acid solution of aniline, mix evenly, impregnate with the functionalized SBA-15 in step ① in an equal volume, let stand overnight, place and dry after the aniline is polymerized, and obtain a dry powd...

Embodiment 2

[0078] Prepare the encapsulated platinum-based catalyst Pt@N-CMK-3 according to the catalyst preparation method described in Example 1, the difference is that the calcination temperature is changed to 850°C, 700°C, and 600°C respectively to make the encapsulated platinum-based catalyst Pt@N-CMK-3 N-CMK-3-850°C, Pt@N-CMK-3-700°C, Pt@N-CMK-3-600°C, apply the same conditions as in Example 1 to Cr(VI) under neutral conditions Liquid-phase catalytic hydrogenation reduction.

[0079] The result is as Figure 6 It can be seen that as the calcination temperature increases, the reduction effect of pollutants is better and the initial activity is higher.

Embodiment 3

[0081] Same as Example 1, the catalyst prepared in Example 1 was used to carry out the liquid-phase catalytic hydrogenation reduction reaction of Cr(VI) under neutral conditions. The catalyst uses Pt@N-CMK-3, its concentration is 0.07g / L, 0.125g / L, 0.15g / L, 0.20g / L, the initial concentration of Cr(VI) is 0.5mM, and the reaction pH is 5.6~ 7. The flow rate of hydrogen is 150-200mL / min, and the reaction is carried out at normal temperature and pressure for 2 hours.

[0082] Response curve such as Figure 7 As shown in (A), when the catalyst concentration is 0.20g / L, Cr(VI) is basically reduced after 2 hours of reaction, and the initial activity column diagram is as follows Figure 7 As shown in (B), the initial activity of the catalyst is basically maintained at 20mM gCat -1 h -1 , indicating that there is no mass transfer resistance in the reaction system.

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Abstract

The invention discloses a packaged noble metal catalyst for liquid-phase catalytic hydrogenation reduction of Cr (VI) under a neutral condition and a preparation method of the packaged noble metal catalyst. The preparation method comprises the following steps: by taking mesoporous silica SBA-15 as a template, synchronously filling pores of SBA-15 with a carbon source aniline and a Pt source chloroplatinic acid, roasting, carbonizing and reducing noble metal platinum, carbonizing aniline to obtain a nitrogen-doped carbon skeleton, and removing the SBA-15 template to obtain the encapsulated noble metal catalyst. According to the catalyst, precious metal platinum is encapsulated in the nitrogen-doped ordered mesoporous carbon skeleton, the activity can be improved through nitrogen doping, small Pt particles and large-area catalytic active sites, the stability can be improved through an encapsulation type structure, and the catalyst has high activity and stability in Cr (VI) liquid-phase catalytic hydrogenation reduction reaction under the neutral condition.

Description

technical field [0001] The invention belongs to the technical field of catalytic hydrogenation and industrial waste water Cr(VI) treatment, and in particular relates to an encapsulated noble metal catalyst, a preparation method thereof and the application of catalytic hydrogenation to reduce Cr(VI) under neutral conditions. Background technique [0002] Chromium is one of the most important metals in modern technology, often used in the manufacture of items such as stainless steel, auto parts and magnetic tape. Chromium pollution in water mainly comes from sewage discharged from mineral processing, metal polishing, leather tanning, and printing and dyeing industries. Chromium in the water environment mainly forms anion Cr 2 o 7 2- and cationic Cr 3+ form exists. Cr(VI) is defined as an ingestion poison and an inhalation extremely poison. Skin contact may cause allergies, and inhalation may cause cancer. Cr(VI) is easily absorbed by the human body, and it can invade the ...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J35/10C02F1/70C02F101/22
CPCB01J29/0325C02F1/705C02F2101/22B01J35/61
Inventor 许昭怡余乐郑寿荣李明会龙莉郑长龙孙玉菡
Owner NANJING UNIV
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