What are the environmentally friendly catalysts for polyurethane that replace organotin?

What are the environmentally friendly catalysts for polyurethane that replace organotin?
XD-20: high content organic bismuth catalyst, less foaming, shorter service life, slightly worse post-curing effect compared with organic tin, used in polyurethane synthetic leather, adhesive, elastomer, coating, polyurethane foam field.

XD-28: 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 to the formula.

XD-65: Organic zinc catalyst, lower activity co-catalyst.

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