| The active site of a heterogeneous catalyst can be thought of as the ensemble of atoms that directly catalyzes a reaction. |
| His almost unnoticed donkey work was the catalyst for a superb performance. |
| His murder was the catalyst for the outbreak of gun terror around Chapeltown as Yardies and home-grown dealers battled for supremacy. |
| A modest investment could be a catalyst for the rejuvenation of an historic industrial area. |
| When the catalyst is dissolved in the same solvent as the reagents, getting the catalyst back can be a difficult matter. |
| A catalyst for this reevaluation was horrifying devastation caused by use of the atomic bomb in Japan. |
