Bifunctional catalyst for photocatalytic oxidation of p-xylene and synchronous reduction of water to produce hydrogen as well as preparation method and application of bifunctional catalyst
A bifunctional catalyst, photocatalytic oxidation technology, applied in catalyst activation/preparation, oxidation preparation of carbonyl compounds, physical/chemical process catalysts, etc., can solve problems such as resource waste and environmental pollution, and achieve easy operation and mild reaction conditions. Effect
Pending Publication Date: 2022-04-12
XINJIANG UNIVERSITY
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Problems solved by technology
[0005] The purpose of the present invention is to provide a bifunctional catalyst for photocatalytic oxidation of p-xylene synchronously reducing water to produce hydrogen and its preparation method and application, so as to solve the problems in the above-mentioned prior art. Through the development of the bifunctional catalyst, the present invention Combining photocatalytic water reduction and PX oxidation, a new efficient, mild, and green path for PX oxidation was developed, and at the same time, it solved the environmental pollution and resources caused by the use of hole sacrificial agents in the photocatalytic water reduction hydrogen production system. The problem of waste is a new green dual-excellence route that can realize PX oxidation and water reduction hydrogen production at the same time
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Embodiment 1
[0036] Such as Figure 5 As shown, the catalyst TiO 2 The synthesis method of -CdS / Ni is as follows:
[0037] 1.1 Synthesis of precursor MOFs material MIL-125(Ti)
[0038] Terephthalic acid (H 2 BDC) (1.67g, 10mmol) and tetrabutyl titanate Ti(OC 4 h 9 ) 4 (0.87 mL, 2.5 mmol) was added to a dehydrated solution containing N,N-dimethylmethylamine (DMF) (40 mL) and methanol (4 mL). After stirring at room temperature for 30 min, the above solution was transferred to a 100 ml dried hydrothermal autoclave, and heated at 150 °C for 24 h. After cooling to room temperature, the precipitate was centrifuged, washed with DMF and methanol, and finally dried at 60 °C for 12 hours to obtain MIL-125(Ti).
[0039] 1.2 Morphology of MOFs TiO 2 Synthesis
[0040] Put the synthesized MIL-125(Ti) powder into a muffle furnace, raise the temperature to 400°C at a heating rate of 5°C / min in an air atmosphere, and incinerate at 400°C for 5h. After cooling to room temperature, the white powder...
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The invention discloses a bifunctional catalyst for synchronously reducing water to produce hydrogen through photocatalytic oxidation of p-xylene and a preparation method and application of the bifunctional catalyst, and belongs to the field of composite photocatalysts.The preparation method comprises the steps that titanium dioxide, nickel chloride and cadmium acetate dihydrate are dissolved in water and mixed to obtain a uniform mixed solution; and dropwise adding a sodium sulfide solution into the uniformly mixed solution, adding sodium hydroxide and sodium borohydride, fully stirring, carrying out a hydrothermal reaction, and finally washing and drying to obtain the bifunctional catalyst. According to the method, PX is successfully oxidized into p-tolualdehyde through the photo-generated hole oxidation capacity generated in the photocatalysis process, meanwhile, hydrogen energy is prepared through photo-generated electron reduction water, oxidation and reduction half reactions in the photocatalysis process are fully utilized, and corresponding valuable products are obtained.
Description
technical field [0001] The invention relates to the field of composite photocatalysts, in particular to a bifunctional catalyst for photocatalytic oxidation of p-xylene to synchronously reduce water to produce hydrogen, a preparation method and application thereof. Background technique [0002] Paraxylene (PX) is derived from petroleum and is an important organic chemical raw material. In industry, PX is used as raw material, air is used as oxidant, cobalt acetate and manganese acetate are used as catalyst, acetic acid is used as solvent, and bromide is used as accelerator. Under the condition of high pressure (200~300℃, 1.5~3.0MPa), adopt the liquid phase catalytic oxidation method to obtain its oxidation product. The traditional Co / Mn / Br catalyst requires a high temperature and an organic reagent system when oxidizing PX. Since the reaction uses highly corrosive bromide as one of the catalysts, it aggravates the corrosion of the reactor, resulting in equipment construction...
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IPC IPC(8): B01J27/04B01J37/08B01J37/16B01J37/20C01B3/04C07C45/28C07C47/542
Inventor 郭长艳郭成王吉德张莹陈廷祥张留根邹阳阳
Owner XINJIANG UNIVERSITY
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