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Escaping the Tyranny of Carbothermal Reduction: Fumed Silica from Sustainable, Green Sources without First Having to Make SiCl4

机译:避免减少碳热的暴政:从可持续的绿色资源中提取气相二氧化硅,而无需首先制备SiCl4

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摘要

Fumed silica is produced in 1000 tons per year quantities by combusting SiCl4 in H-2/O-2 flames. Given that both SiCl4 and combustion byproduct HCl are corrosive, toxic and polluting, this route to fumed silica requires extensive safeguards that may be obviated if an alternate route were found. Silica, including rice hull ash (RHA) can be directly depolymerized using hindered diols to generate distillable spirocyclic alkoxysilanes or Si(OEt)(4). We report here the use of liquid-feed flame spray pyrolysis (LF-FSP) to combust the aforementioned precursors to produce fumed silica very similar to SiCl4-derived products. The resulting powders are amorphous, necked, <50nm average particle sizes, with specific surface areas (SSAs) of 140-230m(2)g(-1). The LF-FSP approach does not require the containment constraints of the SiCl4 process and given that the RHA silica source is produced in million ton per year quantities worldwide, the reported approach represents a sustainable, green and potentially lower-cost alternative.
机译:通过在H-2 / O-2火焰中燃烧SiCl4,可以每年生产1000吨气相法二氧化硅。鉴于SiCl4和燃烧副产物HCl都具有腐蚀性,毒性和污染性,因此这种气相法二氧化硅的生产需要广泛的保护措施,如果找到其他替代方法,则可以避免。可以使用受阻二醇将包括稻壳灰(RHA)在内的二氧化硅直接解聚,生成可蒸馏的螺环烷氧基硅烷或Si(OEt)(4)。我们在这里报告了使用液体进料火焰喷雾热解(LF-FSP)燃烧上述前体以生产与SiCl4衍生产品非常相似的气相二氧化硅。所得粉末为无定形,颈缩,平均粒径小于50nm的粉末,比表面积(SSA)为140-230m(2)g(-1)。 LF-FSP方法不需要约束SiCl4工艺,并且鉴于RHA二氧化硅源在世界范围内的年产量为百万吨,因此报告的方法代表了一种可持续的,绿色的且成本可能更低的替代方法。

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