catalyze vs step up

catalyze

verb
  • To accelerate a process. 

  • To inspire significantly by catalysis. 

  • To bring about the catalysis of a chemical reaction. 

step up

verb
  • To increase, augment, or advance, especially by one or more steps. 

  • To assume or take responsibility. 

How often have the words catalyze and step up occurred in a corpus of books? (source: Google Ngram Viewer )