You can't do a 1hr30min transfer in PEK with change of Terminal from T2 to T3. That's below MCT, and won't be sold on one ticket. I'd check on that again. It's either a much longer layover, or not a change of terminals. 1.5hrs within T2 or T3 is perfectly doable.

PEK, while not being a great airport to transfer, is much better than doing an int-int transfer in many other countries (like the US) where you might even have to pay money to do so (ESTA, for example) - in PEK you can even get out of the airport and into the city for up to three days (72hrs TWOV - you'll spot the advertisements while there) ^