What are the environmentally friendly catalysts used in polyurethane? The ones that can replace organotin?

What are the environmentally friendly catalysts used in polyurethane? The ones that can replace organotin?
Recommended if high catalytic efficiency is required and environmental requirements are met. If the activity requirement is not high, then organobismuth can be used.

High content organic bismuth catalyst, less foaming, shorter use period, slightly worse post-curing effect compared with organic tin, used in polyurethane synthetic leather, adhesives, elastomers, coatings, polyurethane foam field.

Environmentally friendly tin catalyst, no EU restriction of nine types of organic tin, used in polyurethane synthetic leather, adhesives, coatings and other fields, similar activity to dibutyltin dilaurate, no major changes in the formula.

Organozinc catalyst, lower activity co-catalyst.

Other products: organic amine catalyst, special metal catalyst, used in polyurethane adhesive, coating, synthetic leather, etc.