Transit Visa - 15/10/14

Hello
I am an Australian passport holder. I'll be flying from Vietnam, land in Guangzhou at 1:00 and fly out at 10:00. The flt from GZ will stop at Beijing for about 3 Hours (13:30 - 15:50) before heading off to Vancouver in Canada. I have all etickets paid, all the way to Vancouver.

I have no plan to leave the transit areas of GZ and Beijing airports.

Does the 24H free transit policy applies?
Do I need to apply for a transit Visa?
I know I cannot have the 72H transit Visa because the flt from GZ stops in Beijing.

Your reply is very much appreciated.
Ta