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Heterogeneous Catalysis definition

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A process where you have one material supporting the actual catalyst for a reaction.  One common example is where a porous inorganic material (such as a zeolite) supports small metal particles.  Through using small particles, you maximize the catalyst surface area, making it more efficient.

See also:

High-resolution electron microscopy (HREM) definition
heat exchange area definition
Helicity definition
hexode definition
heteroepitaxy definition