Abstract
In this work, industrial waste hexafluorosilicic acid (H2SiF6 or FSA) has been proven to be a low-cost alternative to silicate esters for the synthesis of high-quality MCM-41 (high surface area, hi...
Highlights
Hexafluorosilicic acid (H2SiF6 or FSA) is a hazardous and corrosive byproduct of the production of hydrogen fluoride (HF) and phosphate-containing fertilizers
Starting from a wellestablished procedure to obtain MCM-41 from TEOS,[20] a tentative synthesis in the same experimental conditions was performed by replacing TEOS with FSA (TEOS_MCM41 and FSA_MCM41)
Hexafluorosilicic acid (H2SiF6 or FSA), an industrial waste mainly deriving from the fertilizer industry and the production of HF, was proved to be an excellent substitute for the common Si-containing precursors in the synthesis of highly ordered mesostructured silicas, such as MCM-41
Summary
Hexafluorosilicic acid (H2SiF6 or FSA) is a hazardous and corrosive byproduct of the production of hydrogen fluoride (HF) and phosphate-containing fertilizers. N2-physisorption measurements (Figure 8c) confirmed the retention of the textural properties: similar values for pore volume, pore diameter, and very similar pore size distribution were found (Table 3, Figure 8d), a decrease of 10% in the value of the surface area was observed, as in the case of sorbents derived from MCM41_Ref.[19,20,50] These findings highlight the feasibility of FSA as an alternative silica source to obtain high valueadded mesostructured siliceous materials, to be efficiently used as supports of active phases in environmental applications such as H2S removal from sour syngas and in other applications in which gas−solid or liquid−solid reactions are involved
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