Disclosed herein is a method and chemical process for separating the cathode metal oxides of lithium-ion batteries. The main utility of this method is in recycling the cathode active material of used batteries to effectively offer a closed route supply chain solution for battery manufacturers. The invention acts on transition metal solubility in a unique way by using excess ammonia to separate transition metal compounds from lithium as hexammines through a ligand substitution reaction. It is tailored for recycling NMC cathodes and can adjust to process various chemistries depending on future demand.

Disclosed herein is a method and chemical process for separating the cathode metal oxides of lithium-ion batteries. The main utility of this method is in recycling the cathode active material of used batteries to effectively offer a closed route supply chain solution for battery manufacturers. The invention acts on transition metal solubility in a unique way by using excess ammonia to separate transition metal compounds from lithium as hexammines through a ligand substitution reaction. It is tailored for recycling NMC cathodes and can adjust to process various chemistries depending on future demand.

Disclosed is a method for the selective catalytic reduction of NO.sub.x in waste/exhaust gas by using ammonia provides by heating one or more salts of formula M.sub.a(NH.sub.3).sub.nX.sub.z, wherein M represents one or more cations selected from alkaline earth metals and transition metals, X represents one or more anions, a represents the number of cations per salt molecule, z represents the number of anions per salt molecule, and n is a number of from 2 to 12, the one or more salts having been compressed to a bulk density above 70% of the skeleton density before use thereof.

Disclosed is a method for the selective catalytic reduction of NO.sub.x in waste/exhaust gas by using ammonia provides by heating one or more salts of formula M.sub.a(NH.sub.3).sub.nX.sub.z, wherein M represents one or more cations selected from alkaline earth metals and transition metals, X represents one or more anions, a represents the number of cations per salt molecule, z represents the number of anions per salt molecule, and n is a number of from 2 to 12, the one or more salts having been compressed to a bulk density above 70% of the skeleton density before use thereof.