catalysts 124 catalysis 36 hydrogenation 12 heterogeneous catalysis 8 academic theses 8 chemical reactors 7 organic chemistry 7 more ... organic synthesis 7 palladium 7 chemical reactions 6 mathematical models 5 platinum 5 biofuels 4 biotechnologies 4 chemical technology 4 enzymes 4 oxidation 4 nitrogen oxides 4 polymerization 4 rhodium 4 internal combustion motors 4 exhaust gases 4 zeolites 4 biomass 3 chemistry 3 dienes 3 photocatalysis 3 physical chemistry 3 imissions 3 carbonyl compounds 3 less ...