Synthesizing ammonia, the key ingredient in fertilizer, is energy intensive and a significant contributor to greenhouse gas warming of the planet. Chemists designed and synthesized porous materials — metal-organic frameworks, or MOFs — that bind and release ammonia at more moderate pressures and temperatures than the standard Haber-Bosch process for making ammonia. The MOF doesn’t bind to any of the reactants, making capture and release of ammonia less energy intensive and greener.Synthesizing ammonia, the key ingredient in fertilizer, is energy intensive and a significant contributor to greenhouse gas warming of the planet. Chemists designed and synthesized porous materials — metal-organic frameworks, or MOFs — that bind and release ammonia at more moderate pressures and temperatures than the standard Haber-Bosch process for making ammonia. The MOF doesn’t bind to any of the reactants, making capture and release of ammonia less energy intensive and greener.