Method for preparing mesoporous silicon carbide material at low temperature
A technology of mesoporous silicon carbide and mesoporous silicon dioxide, which is applied in the field of low-temperature preparation of mesoporous silicon carbide materials, can solve the problems of destroying the structure of SiC materials, difficulty of SiC materials, and unfavorable practical applications.
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Embodiment 1
[0016] Embodiment 1: concrete steps are as follows:
[0017] 1. Mesoporous silica SBA-15, sucrose, H 2 SO 4 and deionized water in a mass ratio of 1:0.71:0.14:3, treated at 100°C for 6 hours, then at 160°C for 6 hours, and then carbonized at 700°C for 6 hours under nitrogen protection to obtain C / SBA-15.
[0018] 2. Mix Mg powder and C / SBA-15 in a mass ratio of 1:2, put them into a stainless steel crucible, and react at 650°C for 6 hours under nitrogen protection.
[0019] 3. The resulting product was washed in 10% HF aqueous solution for 5 hours, and finally in 4M HNO 3 in aqueous solution, washed for 6 hours, filtered, washed and dried to obtain mesoporous SiC powder.
[0020] See attached picture, figure 1 The XRD spectrum of the SiC mesoporous material prepared in Example 1 of the present invention is given in . The XRD analysis was carried out on a RigaKu D / max-2550 X-ray diffractometer in Japan; CuKα diffraction was used, and the scanning range was 2θ=10-90°. fro...
Embodiment 2
[0023] Example 2: The implementation process is the same as Example 1 except for the following differences: Mesoporous silica KIT-6, sucrose, H 2 SO 4 and deionized water in a mass ratio of 1:0.71:0.14:3, treated at 100°C for 6 hours, then at 160°C for 6 hours, and then carbonized at 700°C for 6 hours under nitrogen protection to obtain C / KIT-6.
[0024] See attached picture, figure 1 The XRD spectrum of the SiC mesoporous material prepared in Example 2 of the present invention is given in . from figure 1 It can be seen that the XRD pattern of SiC prepared with KIT-6 as a template is basically consistent with that of Example 1 (with SBA-15 as a template).
[0025] See attached picture, figure 2 (b) is a TEM photograph of the SiC mesoporous material obtained in Example 2. It can be seen from the TEM photo that the SiC prepared in Example 2 has an obvious mesoporous structure.
[0026] See attached picture, image 3 (b) is the infrared spectrum of the SiC mesoporous ma...
Embodiment 3
[0027] Example 3: The implementation process is the same as Example 1 except for the following differences: mesoporous silica SBA-15, sucrose, H 2 SO 4 and deionized water in a mass ratio of 1:0.71:0.14:3, treated at 100°C for 6 hours, then at 160°C for 6 hours, and then carbonized at 500°C for 6 hours under the protection of nitrogen to obtain C / SBA-15.
[0028] The XRD peaks of the prepared SiC sample are similar to those of Example 1, but the intensity is slightly lower; the TEM and infrared spectra are basically the same as those of Example 1.
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Abstract
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