info transit

Hello,i would like to ask this question, cause i call a cina agency in my country ( italy) and and they did not give me information..
I'm going to buy a flight ticket from Milano to Begin on 5August with AirChina ( i will land on 6Aug in the morning) , and another flight (same carrier) from Bejing to Seul on 10Aug. So 5 days stopover in Bejing ( 2 different flight). I'm eligible to use the 144hr transit visa?? Is that ok this flight combination? thank you