Microsoft has chosen to only support 8th gen and later Intel processors. Here are a number of Microsoft articles that discuss the requirements:
Now, there are ways that you can run Windows 11 on older processors (and even processors that do not meet the TPM requirement), but you need to understand the consequences. Microsoft states,
This PC doesn't meet the minimum system requirements for running Windows 11 - these requirements help ensure a more reliable and higher quality experience. Installing Windows 11 on this PC is not recommended and may result in compatibility issues. If you proceed with installing Windows 11, your PC will no longer be supported and won't be entitled to receive updates. Damages to your PC due to lack of compatibility aren't covered under the manufacturer warranty.
Remember that 'Damages' include your system being vulnerable to hacking due to a lack of security updates.
Hope this covers it,