PS3 Games on PS2: Absolutely Impossible

Absolutely not.

• CPU: PS3 = Cell Broadband Engine (1 PPE + 6 SPEs @ 3.2 GHz). PS2 = Emotion Engine (MIPS III @ 299 MHz). Zero Compatibility
• GPU: PS3 = RSX (Nvidia G70 @ 550 MHz). PS2 = Graphics Synthesizer (eDRAM, 2.4 GPixel/s)
• Media: PS3 = Blu-ray (25/50 GB, Blue Laser 405nm). PS2 = DVD (4.7/8.5 GB, Red Laser 650nm). PS2 Laser physically cannot read Blu-ray pits
• OS/API: PS3 = CellOS / PSGL / GCM. PS2 = Custom Kernel / GS/VPU Microcode

Backward Compatibility is One-Way

• PS3 (Fat 20/60/80GB) → Plays PS2 Games (Hardware EE+GS / Software Emulation)
• PS2 → Cannot Play PS3 Games

Alternatives

• Play PS3 games on PC (RPCS3 Emulator) (Requires Ryzen 5 / i5 10th Gen + Vulkan GPU)
• PlayStation Plus Premium Streaming (PS4/PS5/PC)