Chickens, cats and coffee granules

the majority of cats pose no threat to chickens and if you do find one a quick squirt from a water pistol will put them off 

Water pistol treatment puts them off, for whatever reason you want to keep them away 

Tea! You need to break a tea bag into some water and throw it over the cat. It wont harm the cat in any way but they can't stand it. It gives the cat an initial shock and when they try and clean themselves they don't like the tea taste. It takes them a long time to get rid of it all.

My 3 cats pose no threat to my hens - if anything it's the other way round. The hens will peck the cats if they are somewhere that that want to dig and they want them to move, so the cats give them a wide berth.  

Re. coffee, I thought it was coffee grounds, i.e the stuff that is left behind after using a peculator or cafetiere, that people put down to deter cats rather than granules. I suppose it would smell stronger.