From Nepal to Beijing, with a layover in Chengdu

I am traveling from kathmandu to Beijing. However my flight includes a 4 hour layover in CD . My flight schedule is as follows:

February 28th: Kathmandu to CD: arrival in CD 4:40pm
CD to Beijing: departs 8:35 pm, arrives Beijing 11:15 pm

March 3: Depart Beijing for Tokyo at 8:35 am.

Do I qualify for the 72 hour transit free visa??