A method for preparing ammonia by using ammonia synthesis-biomass conversion dual-functional photocatalytic reaction
A photocatalytic reaction and biomass technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, preparation/separation of ammonia, etc., can solve the problem of low photocatalyst photogenerated electron-hole separation and migration efficiency and low molecular reactivity , low reaction efficiency and other issues, to achieve high yield, high raw material utilization, and improved thermodynamics
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Embodiment 1
[0030]This embodiment prepares Zn deficiency-Zn according to the following steps 3 In 2 S 6 nanomaterials:
[0031] Step 1, weigh 1.5mmol of zinc nitrate, 1mmol of indium nitrate hydrate and 3mmol of cysteine in a beaker filled with 60mL of deionized water, and stir to dissolve them;
[0032] Step 2, transfer the mixture in step 1 to a 100ml polytetrafluoroethylene liner, seal it, heat it with water at 200°C, and after 20 hours, wash it with deionized water and dry it in vacuum to obtain the Zn defect-Zn 3 In 2 S 6 nanomaterials.
[0033] Other surface defect modified transition metal dichalcogenides (TMDs) such as Cd defect-CdIn 2 S 4 , Cd defect-CdLa 2 S 4 , Zn defect-Cd x Zn 1-x S(x=0-1) and Zn defects-Zn x In 2 S 3+x (x=1-5) and the like can be prepared by changing the raw materials and process conditions and adopting the above-mentioned preparation method. Among them, the raw materials of metal elements are their nitrates, and the ratio of raw materials i...
Embodiment 2
[0049] This example is the same as Example 1, except that the hydrothermal temperature in step 2 is 180°C, and Zn 3 In 2 S 6 nanomaterials.
[0050] For the Zn defect-Zn prepared by Example 1 of the present invention 3 In 2 S 6 And the Zn that embodiment 2 prepares 3 In 2 S 6 Nanomaterials were characterized, and the results were as follows figure 1 , figure 2 , image 3 and Figure 4 shown. in, figure 1 X-ray diffraction (XRD) pattern, Zn defect-Zn 3 In 2 S 6 and Zn 3 In 2 S 6 All the diffraction peaks in the diffraction pattern correspond well to the hexagonal phase Zn 3 In 2 S 6 . Illustrates the pure phase of Zn 3 In 2 S 6 was successfully prepared, and the Zn-defects did not cause the generation of new material phases.
[0051] figure 2 Zn defect-Zn 3 In 2 S 6 The transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM) images of the sample, it can be seen from the figure that the sample is an ultr...
Embodiment 3
[0055] This example is the construction of a bifunctional reaction system (benzyl alcohol is used in the mixed solution of biomass and water containing alcoholic hydroxyl groups), and the detailed steps are as follows:
[0056] Step 1, add 0.03g of Zn defect-Zn 3 In 2 S 6 Nanomaterials and 50mL of benzyl alcohol were added to a 100mL three-port polytetrafluoroethylene reactor;
[0057] Step 2, feed N into the reactor 2 After evacuating the air, keep the N in the reactor 2 The pressure is about 0.2Mpa;
[0058] Step 3: After stirring for about 0.5 h in the dark state to balance the adsorption and desorption, turn on the visible light source, extract 5 mL of the reaction solution every 1 hour, centrifuge, and analyze and detect the liquid phase products in the reaction solution such as ammonia and aldehydes.
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