Abstract
Halloysite was trimethylsilylated in a mixture of hexamethyldisiloxane, 2-propanol and hydrochloric acid to the extent that small amounts of raw halloysite remained. The resulting product (PTSH) was heated in nitrogen and air. Heating in air scarcely influenced thermal degradation. The PTSH was in an amorphous state at 673–1273 K and crystallized into mullite at a higher temperature. The N 2-BET specific surface area (250 m 2/g) of the PTSH increased to 390 m 2/g after heating to 673 K and decreased to 270 m 2/g at 1073 K in nitrogen. The PTSH, regardless of heat-treatment temperatures, included extremely homogeneous pores of 1.7 nm. The number of acidic sites and their acidic strength were lower than those of commercially available catalysts.
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