The Synthesis of Binder-Based Metal Halide Absorbents for Ammonia Absorption

Ammonia is a very important chemical to sustain human life because of its use in crop fertilization and future prospects as a carbon-free energy source. The need for a sustainable production method arises as an alternative to the Haber-Bosch process that is less energy intensive and carbon-free. The production of green ammonia can be idealized using renewable energy sources, low-pressure synthesis, and an absorber column. The absorber column replaces the condenser, used to liquify ammonia post reaction, with a solid absorbent capable of separating ammonia in the gas-phase. Metal halides display high selectivity and high ammonia absorption capacities, but improvements need to be made to allow for sufficient ammonia uptake and release over multiple cycles. A binder can be added to these absorbents to increase the stability during these cycles, therefore increasing their lifetime. The effect of Ludox as a binder is investigated as a new absorbent synthesis technique on multiple metal halides. The structure, stability, and porosity are evaluated as well as their absorption performance.

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