BiOCl/MoO2 composite catalyst as well as preparation method and application thereof

A composite catalyst and mixed solution technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, preparation/separation of ammonia, etc., can solve problems such as poor adsorption and activation capacity, high energy consumption of CO2, and low utilization rate, and achieve Easy large-scale production, good feasibility and strong controllability

Active Publication Date: 2021-03-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the easy recombination of photogenerated carriers in BiOCl, the utilization rate of light is low, and the limited surface defects and N 2 The adsorption and activation ability of BiOCl is poor. Researchers have improved the utilization rate of photogenerated carriers in BiOCl by various means (such as constructing semiconductor heterojunction, loading noble metals, doping metals or non-metals, adding sacrificial agents, etc.), and its Absorption of light and N 2 The adsorption and activation capacity
However, the modified BiOCl system catalyst material still requires high temperature and high pressure to achieve photocatalytic nitrogen fixation, and there is a large amount of CO 2 emissions, energy consumption, etc.

Method used

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  • BiOCl/MoO2 composite catalyst as well as preparation method and application thereof
  • BiOCl/MoO2 composite catalyst as well as preparation method and application thereof
  • BiOCl/MoO2 composite catalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0034] Preparation of BiOCl nanosheets. Dissolve a certain amount of mannitol in deionized water, stir evenly, and then add a certain amount of Bi(NO 3 ) 3 , stir evenly, and finally add saturated KCl solution dropwise. The obtained mixed solution is then transferred to a hydrothermal kettle, heated at 100-200° C. for 4-24 hours, then cooled, washed and dried to obtain BiOCl nanosheets. Wherein, the volume of mannitol may be 5-50ml. Bi(NO 3 ) 3 The quality can be 0.5 ~ 15g. The volume of the saturated KCl aqueous solution may be 5-50 ml. It should be understood that the preparation method of BiOCl nanosheets in the present invention includes but not limited to hydrothermal method and the like.

[0035] MoO 2 Preparation of nanosheets. A certain amount of MoCl 5 Dissolve in ethanol solution, add a certain amount of deionized water and nitric acid solution, stir and mix evenly, transfer to a hydrothermal reaction kettle, heat at 150-200°C for 12-24 hours, cool, wash an...

Embodiment 1

[0053] Example 1: Modification of MoO in different proportions 2 Photocatalytic nitrogen fixation experiment of BiOCl material in aqueous phase

[0054] (1) Dissolve a certain amount of mannitol (0.546g) in deionized water (25ml), stir well, then add a certain amount of Bi(NO 3 ) 3 (0.486g), stir well. Finally, a saturated KCl solution was added dropwise and stirred for 0.5 h to obtain a mixed solution;

[0055] (2) Transfer the resulting mixed solution to a hydrothermal kettle, hydrothermally treat it at 160°C for 4 hours, then cool, wash and dry to obtain BiOCl nanosheets, the size of the BiOCl nanosheets is 0.1-1 μm, and the thickness is 10 ~100nm;

[0056] (3) Then a certain amount of MoCl 5 (0.482g) was dissolved in ethanol solution (8ml), then added a certain amount of deionized water and nitric acid solution (concentration 50wt%, 2ml), stirred and mixed evenly, transferred to a hydrothermal reaction kettle, and hydrothermally treated at 180°C for 12h, Cool, wash a...

Embodiment 2

[0063] Example 2: BiOCl / MoO 2 Composite with optimal ratio of BiOCl:MoO 2 =1:1 cyclic nitrogen fixation experiment:

[0064] (1) Preparation of BiOCl / MoO 2 Composite material (with embodiment 1, BiOCl: MoO 2 Mass ratio 1:1);

[0065] (2) The obtained BiOCl / MoO 2 After the composite material is fully ground, take 0.1g of powder and add it to 200mL of water, put it in a 600mL reactor, the reactor is an open system, and stir for 0.5h in the dark to conduct the adsorption-desorption equilibrium experiment;

[0066] (3) Turn on the xenon lamp and illuminate for 1 hour under the simulated sunlight light source;

[0067] (4) Suction filtration, take 50mL of filtrate and put it in a colorimetric tube, add 1mL of potassium sodium tartrate and 1mL of Nessler's reagent, shake well, let it stand for 10-15min, wait for the color development to stabilize, and use a UV spectrophotometer to detect the ammonia production;

[0068] (5) the resulting BiOCl / MoO 2 Repeat steps (2)-(4) for c...

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Abstract

The invention relates to a BiOCl/MoO2 composite catalyst as well as a preparation method and application thereof. The BiOCl/MoO2 composite catalyst comprises a BiOCl base material and MoO2 nanosheetsloaded on the surface of the BiOCl base material.

Description

technical field [0001] The present invention relates to a kind of BiOCl / MoO 2 Composite catalyst and its preparation method and application, in particular to a BiOCl / MoO-based 2 Composite materials and their preparation methods and applications in the field of nitrogen fixation. Background technique [0002] N 2 As a raw material for synthetic ammonia, it is abundant in the earth, but N 2 The molecule is a non-polar molecule, the nitrogen-nitrogen triple bond has a bond energy of 945kJ / mol, and the first bond dissociation energy is high, the nucleophilicity to the proton is weak, and it is extremely difficult to be reduced. At present, artificial nitrogen fixation mainly adopts the Haber method, and its reaction conditions are harsh, and it needs to be carried out under high temperature and pressure, which consumes a lot of energy and is accompanied by a large amount of CO. 2 emission. Therefore, from the perspective of cost control and environmental protection, it is o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/132B01J35/02C01C1/04
CPCB01J27/132B01J35/004B01J35/023C01C1/0411Y02P20/52
Inventor 王文中肖彩林张玲周璟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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