In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 1941-30-6, name is Tetrapropylammonium bromide, introducing its new discovery. Safety of Tetrapropylammonium bromide
The development of new materials for ion-exchange applications is interesting and important. A crystalline material based on an anionic telluromolybdate molecular wire, Mo-Te-O, was carefully synthesized, and it exhibits unique ion-exchange properties. On the one hand, NH4+ is exchanged with alkaline metal ions. Cs+, as radiation waste in nuclear wastewater, can be selectively removed rapidly and efficiently. On the other hand, because of the flexible crystal structure, large organoammonium cations are incorporated in the structure of the material by ion-exchange. After ion-exchange, the molecular wire building block becomes stable.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 1941-30-6 is helpful to your research. Safety of Tetrapropylammonium bromide
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI