Cobalt Nickel Nitrogen Array as a Easily Eecoverable, Effective Catalyst for Liquid‐Phase Catalytic Reaction with Remarkable Recycled Stability

Abstract

The effective catalysts for the liquid‐phase catalytic (reduction) reaction are constant pursued. Traditional powder catalysts usually suffered from the separation from reaction medium, the aggregation at higher temperature, and poor reused stability, which are not favorable for the practical application. Here, we have shown the cobalt‐nickel nitrides anchored on Nickel foam (NF) as low‐cost catalysts overcoming above disadvantages by taking the reduction of 4‐nitrophenol to 4‐aminophenol as model. The conversion can reach to 97.6% after the reaction for 5 minutes at 25 °C, being comparable to most non‐noble metal based catalysts. Notably, the catalyst can be manually separated from reaction medium benefited from anchoring nitrides on macroscopical NF substrate. The anchoring can endow the high stability and avoid loss during separation process, thus is especially favorable to give good recycled ability and to use at higher temperature. Indeed, the catalyst can be used at higher temperature (75 °C) to accelerate dramatically reaction (conversion close to 100% within 20 s). Moreover, the activity can be remained after sequential 20 times of catalytic reaction, which is superior to the catalysts ever reported. The catalyst is promising for the practical catalytic application.