Ziegler-Natta catalyst particle size control in propylene/α-olefin (co)polymerizations

•The influence of particle size of Ziegler-Natta (ZN) catalysts on the micro-structure and properties of related polypropylenes.•Experimental mild conditions for the catalyst choice together with excellent catalytic activity.•Catalysts with a larger particle size provided polymers with a lower isotacticity index, and a shorter meso sequence length.•The importance of catalyst/support particle size control during the preparation process in industrial polypropylene plants.