# Hydrogenation of Carbamates, Ureas, and Polyurethanes Using Heterogeneous Catalysts

## TL;DR

This paper shows how to use solid catalysts to break down and convert carbamates, ureas, and polyurethanes into useful chemicals like formamides, alcohols, and polyols.

## Contribution

The study introduces a heterogeneous catalytic method for hydrogenating carbamates, ureas, and polyurethanes with high selectivity and catalyst recyclability.

## Key findings

- Carbamates and urea derivatives were selectively hydrogenated to formamides, alcohols, and amines.
- Polyurethanes were depolymerized into diamines and polyols under the same catalytic conditions.
- The catalyst was successfully recycled for polyurethane depolymerization up to 10 times.

## Abstract

We report here the hydrogenation of carbamates, ureas,
and polyurethanes
using heterogeneous catalysts. Under our catalytic conditions, carbamates
and urea derivatives can be selectively hydrogenated to formamides
and alcohols and amines, whereas polyurethanes were hydrogenatively
depolymerized to make diamines and polyols. Recycling of catalysts
for the hydrogenative depolymerization of a polyurethane has also
been demonstrated 10 times.