High Recyclability Magnetic Iron Oxide‐Supported Ruthenium Nanocatalyst for H 2 Release from Ammonia‐Borane Solvolysis

We report the high capacity of recycling of a technologically simple, easily recoverable, Ru@Fe 3 O 4 magnetic nanocatalyst, efficient in the release of H 2 from ammonia‐borane (AB) solvolysis, using H 2 O or methanol at room temperature (25 °C). The initially oxidized Ru small nanoparticles (2–4 nm) are well‐dispersed on an iron oxide support ( i. e . super paramagnetic iron oxide of spinel structure, SPIO, as aggregates of 20 nm to a few μm). As nanocatalyst, this composite achieved short‐time (