Transition metal catalysts can either be homogeneous or heterogeneous catalysts (they can be in the same physical state as the reactants or not).
Laboratory example:
2H2O2 --MnO2--> 2H2O +O2
MnO2 is the catalyst.
Industrial example:
Transition metals can be used in petroleum and polymer (plastics, fibers) industries.
http://www.sky-web.pwp.blueyonder.co.uk/Science/transitionmetalcatalysts.htm
http://global.britannica.com/EBchecked/topic/602775/transition-element/81115/Transition-metal-catalysts
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