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It's time to learn a little more about a chemical reaction How do molecules have to be arranged and how much energy do they have to collide with?A heterogeneous catalyst is a catalyst that is present in a different phase (usually a solid) than the reactants Such catalysts generally function by furnishing an active surface upon which a reaction can occur Gas and liquid phase reactions catalyzed by heterogeneous catalysts occur on the surface of the catalyst rather than within the gasHeterogeneous Catalysts A strategy for minimising metal levels in products is to use heterogeneous/supported catalysts These catalyst types also facilitate recovery, reuse and recycling as well as being amenable to use in flow reactions Historically, metals on carbon developed as hydrogenation catalysts were used, but many more sophisticated Http Www Umich Edu Elements 6e Powerpoints 13lectures Lec27 Pdf Pdf Heterogeneous catalyst diagram