Abstract
A controlled thermal treatment of zeolite NH 4A results in the formation of a mixture of mullite and amorphous silica by a chain of pseudomorphic transformation processes: zeolite → amorphous phase → (mullite + amorphous SiO 2). In contrast to the structural changes, particulate properties (particle shape and size, respectively) do not change or change a little during heating. This implies that the resulting mixture of mullite and amorphous SiO 2 does not appear as separate particulate systems, and thus that the transformation processes occur inside single particles (micro-reactors). Base treatment of the final product (mullite + amorphous SiO 2) results in the extraction of the amorphous SiO 2 from the interior of each particle and formation of mullite micro-vessels.
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