Green synthesis of porous Ni‐silicate catalyst for hydrogen generation via ammonia decomposition

Summary A simple synthetic method without organic template is proposed for the synthesis of Ni‐silicate. The resulting Ni‐phyllosilicates are reconstructed by hydrothermal treatment to a porous structure with a high surface area (552 m2 g−1). Notably, the residual filtrate has a Ni2+ ion content of less than 0.1 ppm, and therefore satisfies the effluent standard in Taiwan (99%) toward ammonia decomposition at a temperature of 400°C. Overall, the proposed synthetic method is facile and easily extendable to the production of other metal‐silicate materials for hydrogen generation. A simple organic template‐free method is proposed for the synthesis of sheet‐like mesoporous Ni‐silicate. The Ni2+ ion content in the filtrated solution is less than 0.1 ppm. The Ni‐silicate demonstrated a high catalytic capability (>99%) toward the ammonia decomposition at 400°C.