energy starting material transition state '' 'does not''' change energy difference starting materials products thermodynamic barrier available energy provided environment heat light related concepts called catalysts really '''precatalysts''' precatalysts convert catalysts reaction example wilkinson 's catalyst rhcl pph loses one triphenylphosphine ligand entering true catalytic cycle precatalysts easier store easily activated situ preactivation step many catalytic reactions involve induction period '''cooperative catalysis''' chemical species improve catalytic activity called
Natural science Chemistry Chemical Engineering Catalysis