Low Temperature Synthesis of Mesoporous SiC in Dual-Confined Spaces via Magnesiothermic Reduction.
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| Title: | Low Temperature Synthesis of Mesoporous SiC in Dual-Confined Spaces via Magnesiothermic Reduction. |
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| Authors: | Wang, Zeng-Rong1 (AUTHOR), Liu, Long1 (AUTHOR), Zhang, Xue1 (AUTHOR), Xu, Jia-Lin1 (AUTHOR), Sun, Qiang1 (AUTHOR) sunq@smm.neu.edu.cn |
| Source: | NANO (1793-2920). Sep2019, Vol. 14 Issue 9, pN.PAG-N.PAG. 10p. |
| Subjects: | Low temperatures, Silicon carbide, Surface area, Catalyst supports, Stainless steel, Porosity, Mesoporous silica |
| Abstract: | Silicon carbide (SiC), especially mesoporous SiC has been in immense vogue for more than a decade because of its intriguing properties and wide applications. However, it is still challenging to synthesize mesoporous SiC with good structural integrality, large specific surface area and desirable porosity at a low temperature. In this study, we reported a "dual-confined spaces"-assisted synthesis of mesoporous SiC using well-assembled SiO2/carbon composite as precursor via a magnesiothermic reduction process. The well-crystallinity mesoporous SiC presented a mesopore structure with high specific surface area of 267.3 m2 g − 1 and large mesopore size of ca. 10 nm can be directly fabricated at a temperature of at least 550∘C and the optimum synthesis temperature is 650∘C. During the synthesis, mesoporous carbon matrix and a pressure-tight stainless steel reactor were served as "dual-confined spaces" to avoid the aggregation of silica and the silicon residue left in the final SiC sample. Furthermore, the as-prepared mesoporous SiC showed prominent performance as catalyst support for the reduction of 4-nitrophenol to 4-aminophenol. The well-crystallinity mesoporous SiC with specific surface area of 267.3 m2 g–1 and large mesopore size of 10 nm was synthesized from well-assembled SiO2/C composite via a facile and energy-saving magnesiothermic reduction process at low temperature in a designed "dual-confined spaces". [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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