Abstract
The influence of acetic acid on the pore structure and surface area of silica prepared by the sol-gel method was investigated. Experimental conditions of synthesis, such as gelation temperature and solvents, were also studied. N2 adsorption isotherms of the samples were type 1, typical of microporous materials, explaining the high surface area values (BET) observed. The simultaneous addition of acetic and hydrochloric acids as catalysts and of acetone as solvent, together with the use of a gelation temperature of 20 ºC, made it possible to prepare amorphous silica materials with surface area values up to 850 m² g-1. The high surface area value of these samples could be explained by the microporosity and the nanometric size of the particles.
Highlights
Inorganic materials possessing high surface area have been largely studied due to their possible application as sorbents, catalysts, sensors, molecular sieves etc.[1,2,3,4] In general, these materials are formed mainly by silicon and aluminum oxides, with ordered structures like those presented by zeolites and clays
In the present work, samples prepared with acetic acid as the only catalyst, present higher surface area values, near twice as high as those prepared only with hydrochloric acid
One exception is sample A, which was synthesized with acetic acid but without initial water addition, for which the surface area obtained was 440 m2 g-1
Summary
Inorganic materials possessing high surface area have been largely studied due to their possible application as sorbents, catalysts, sensors, molecular sieves etc.[1,2,3,4] In general, these materials are formed mainly by silicon and aluminum oxides, with ordered structures like those presented by zeolites and clays. The effects of the presence of acetic acid on the pore structure and surface area of silica xerogels were investigated. One exception is sample A, which was synthesized with acetic acid but without initial water addition, for which the surface area obtained was 440 m2 g-1.
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