A heteroatom-containing nano-carbon material, its preparation method and application, and a hydrocarbon oxidative dehydrogenation reaction method
A nano-carbon material and heteroatom technology, applied in the field of hydrocarbon oxidative dehydrogenation reaction, can solve the problem of insufficient catalytic activity, and achieve the effects of improving the utilization rate of raw materials and product yield, good stability and good catalytic activity
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[0052] According to a second aspect of the present invention, the present invention provides a method for preparing a heteroatom-containing nano-carbon material, the method comprising:
[0053] Step A1, contacting the raw carbon nanomaterial with at least one oxidizing agent to obtain an oxidized carbon nanomaterial;
[0054] Step B1, contacting the oxidized carbon nanomaterial with at least one reducing agent under reduction reaction conditions to obtain the reduced carbon nanomaterial;
[0055] Step C1, contacting the reduced carbon nanomaterial with at least one phosphorus source.
[0056] According to the method of the present invention, the raw material nano carbon material contains oxygen element, hydrogen element and carbon element, based on the total amount of the raw material nano carbon material, in terms of elements, the content of the oxygen element is 0.1-1 weight %, preferably 0.5-0.9% by weight; the content of the hydrogen element is 0.1-1% by weight, preferabl...
Embodiment 1
[0128] (1) 5g of multi-walled carbon nanotubes (diameter range of 1-8nm, specific surface area of 273m2) as raw material nano-carbon material 2 / g, the weight loss rate w in the temperature range of 400-800°C 800 , the weight loss rate w in the temperature range of 400-500°C 500 ,w 500 / w 800 0.13, the peroxy group content is 0mol / g, purchased from Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences) and 250mL acid solution (H 2 SO 4 The concentration is 1380g / L, HNO 3 The concentration of the acid solution is 227.5g / L, the solvent of the acid solution is water), and the resulting dispersion is placed in an ultrasonic cleaner for ultrasonic treatment, wherein the temperature of the dispersion in the ultrasonic cleaner is controlled to be 50°C, and the ultrasonic treatment The duration is 6 hours and the frequency of the ultrasound is 45kHz. After the ultrasonic treatment is completed, the dispersion liquid is filtered, and the collected solid matter is was...
Embodiment 2
[0132] Adopt the same method as Example 1 to prepare heteroatom-containing nano-carbon materials, the difference is that in step (2), 2g of oxidized nano-carbon materials are dissolved in 40mL tetrahydrofuran solution of lithium aluminum hydride (lithium aluminum hydride) The concentration is 0.05 mol / L, and the molar ratio of lithium tetrahydrogen to the content of oxygen in the oxidized nano-carbon material is 0.1:1), and reflux at a temperature of 70° C. for 12 hours. The composition and property parameters of the prepared heteroatom-containing carbon nanomaterials are listed in Table 1.
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