72 hour Beijing Visa

Am landing in Beijing at 11:20PM on July 29.Then flying to Irkutsk on Aug 2 at 04:35 in Am.
Returning to Beijing on Aug 7 at 03:45AM and then flying back to US at 08:55 0n the 7th.
Not leaving Beijing airport but transiting to Delta flight from siberian Airlines from irkutsk.
Do I qualify for 72 hour free transit?
Thanks