Netherlands passport - Can I use the 144 hour free transit visa?

I have a Dutch (=Netherlands) passport.
I will be flying from Vancouver to Beijing, stay for 112 hrs, and then travel from Beijing to Kuala Lumpur. Stay in Kuala Lumpur for 7 days and then return to Vancouver (via Beijing, transit 15 hrs).

1. Am I eligible for the 144 hr free transit visa to visit Beijing and Hebei?
2. What is "an onward ticket with a confirmed seat"? Do I need an actual seat number or does it refer to a confirmed ticket?
2. Can I use the 24 hr transit visa the second time in Beijing (for 15 hrs transit)?

Thanks for your help.