To run a PS3 emulator on a 32-bit PC, you'll need to ensure that your system meets the minimum requirements:
RPCS3, the gold standard, requires a 64-bit operating system as a hard baseline. The technical gap was simply too wide to bridge with the limitations of older 32-bit hardware. Are you trying to get a specific running on an older PC, or are you just curious about the technical history of emulation? ps3 emulator pc 32 bit