A kind of bimetallic molecular sieve catalyst and its preparation and application

A molecular sieve and catalyst technology, applied in the field of metal modified catalysts, can solve the problem of less active sites, and achieve the effects of improving the oxidation rate, not easily blocking pores, and maintaining stable performance.

Active Publication Date: 2021-01-26
苏州清初环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But pure KIT-6 has a neutral skeleton and few active sites

Method used

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  • A kind of bimetallic molecular sieve catalyst and its preparation and application
  • A kind of bimetallic molecular sieve catalyst and its preparation and application
  • A kind of bimetallic molecular sieve catalyst and its preparation and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] o 3 Oxidation test: the simulated wastewater is 1L of 20mg / L carbamazepine solution (the natural pH value of the wastewater is 6.5 when the pH is not adjusted), and ozone is continuously added as the oxidant, the gas flow rate is 0.25L / min, O 3 The gas phase concentration is 2mg / L.

[0043] During the contact reaction time of ozone, molecular sieve catalyst and waste water within 0-15 minutes, samples are taken and detected at intervals of 2-5 minutes. When reacting for 2.5 minutes, O 3 The removal rate of carbamazepine was 25.9%, reaching 77.8% in 10 minutes (see figure 2 ).

Embodiment 2

[0045] Catalyst preparation:

[0046] 5gP 123 Dissolve in 175mL of dilute hydrochloric acid solution with a concentration of 0.5mol / L, and stir for 1h;

[0047]Add 5g of n-butanol, stir in a water bath at 35°C for 1h; add 10.75g of ethyl orthosilicate, and then mix 0.634g of nickel acetate and 0.93g of Mn(NO 3 ) 2 4H 2 O was added to the solution to dissolve, and stirred for 24 hours in a water bath at 35°C;

[0048] Afterwards, the solution was put into a hydrothermal reactor and crystallized in an oven at 100°C for 24 hours. After the reaction, the reactor was taken out to cool down to room temperature naturally, suction filtered, and washed.

[0049] The obtained product was dried in an oven at 100°C for 6h, then calcined in a muffle furnace at 550°C for 6h, and the temperature increase rate of the muffle furnace was 2°C / min to obtain the catalyst Mn-Ni-KIT-6 (Si / Mn=Si / Ni=20). Detected by BET method, the specific surface area of ​​the obtained molecular sieve cataly...

Embodiment 3

[0054] Catalyst preparation:

[0055] 5 g P 123 Dissolve in 175mL of dilute hydrochloric acid solution with a concentration of 0.5mol / L, and stir for 1h; add 5g of n-butanol, and stir for 1h in a water bath at 35°C; Co=20 will 0.75gCo(NO 3 ) 2 ·6H 2 O and 1.12gCe(NO 3 ) 2 ·6H 2 O was added to the solution to dissolve, and stirred in a water bath at 35°C for 24 hours; then the solution was placed in a hydrothermal reactor and crystallized in an oven at 100°C for 24 hours. After the reaction, the reactor was taken out and cooled to room temperature naturally, suction filtered, and washed.

[0056] The obtained product was dried in an oven at 100°C for 6h, then calcined in a muffle furnace at 550°C for 6h, and the temperature increase rate of the muffle furnace was 2°C / min to obtain the catalyst Ce-Co-KIT-6 (Si / Ce=Si / Co = 20). Detected by BET method, the specific surface area of ​​the obtained molecular sieve catalyst is 742m 2 / g, the average pore diameter is 6.51nm, a...

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Abstract

The invention provides a bimetallic molecular sieve catalyst. The bimetallic molecular sieve catalyst is a KIT-6 molecular sieve catalyst modified by two metals, wherein the two metals are selected from Mn, Ce, Co and Ni, and the molar ratio of Si to each modifying metal is independently 10-60. The invention further provides a preparation method and application of the bimetallic molecular sieve catalyst. Compared with the conventional loaded catalyst, the bimetallic molecular sieve catalyst provided by the invention has the advantages as follows: metal oxide enters a skeleton, mutual combination is firmer, metal ions are not easily dissolved, and the catalyst performance is stable. The metal molecular sieve catalyst prepared by the preparation method provided by the invention has unique three-dimensional cubic pores; the pore walls are thick; the pore diameter is large; the pores are mutually communicated and are open and orderly, so that material diffusion is facilitated, the internalmass transfer resistance is reduced, and the pores are not easily blocked.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a metal-modified catalyst, its preparation and application. Background technique [0002] PPCPs refer to drugs and personal care products. Representative substances in wastewater containing PPCPs include antimicrobials, antipyretics, analgesics, and anti-inflammatory drugs, estrogens, and other drugs (such as lipid-lowering drugs, antiepileptic drugs, tranquilizers, contrast agents, etc.) and spices commonly used in cosmetics. Carbamazepine has broad-spectrum efficacy and is not only the first-choice antiepileptic drug, but also often used to treat depression, arrhythmia and other diseases, and is widely used because of its remarkable efficacy. Carbamazepine enters the environment through pharmaceutical factory wastewater and human metabolism, and the presence of carbamazepine has been detected in sewage treatment plants, surface water and even drinking water. As ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03C02F1/72C02F1/78C02F101/30
CPCB01J29/0333B01J29/0341B01J2229/186C02F1/725C02F1/78C02F2101/30
Inventor 王斌崔跃宗吴俊学杜森邓述波黄俊王玉珏余刚
Owner 苏州清初环境科技有限公司
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