A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 455-24-3, Name is 4-(Trifluoromethyl)benzoic acid, molecular formula is C8H5F3O2. In an article, author is Kawano, Motoharu,once mentioned of 455-24-3, HPLC of Formula: C8H5F3O2.
ENHANCEMENT OF AMORPHOUS SILICA DISSOLUTION BY INTERACTION WITH SIX-MEMBERED RING HETEROCYCLIC COMPOUNDS
Six-membered ring heterocyclic compounds are widely present in the Earth’s surface environments as biological organic molecules composed of soil organic matter including plant and microbial residues, while little is known about their effect on the dissolution of silicate minerals including amorphous silica. To evaluate the effect of these biological molecules on amorphous silica dissolution, dissolution experiments were carried out by the flow-through method using 0.1 g of amorphous silica and 0.1 mM NaCl electrolyte solutions containing 0.0, 0.1, 1.0, or 10.0 mM of the heterocyclic compounds, piperidine (pK = 11.12), pyridine (pK = 5.25), or pyridazine (pK = 2.33), at a pH of 6, 5, or 4. Additionally, adsorption experiments of the compounds on the amorphous silica surface were performed to confirm the adsorption affinity for the amorphous silica surface. The results demonstrated that these heterocyclic compounds enhance the dissolution rate of amorphous silica in the following order: piperidine > pyridine > pyridazine. When 10.0 mM solutions were used, the heterocyclic compounds enhanced greatly the dissolution rate up to enhancement factors of 6.0 to similar to 14.8, 5.0 to similar to 14.0, and 1.0 to similar to 2.6 through an interaction of piperidine, pyridine, and pyridazine, respectively, in the pH range of approximately 6 to similar to 4. The adsorption experiments indicated that the heterocyclic compounds exhibited significant adsorption affinity for the amorphous silica surface as follows: piperidine > pyridine > pyridazine, which was consistent with the order of their effects on the dissolution enhancement. The geochemical calculation revealed that this order of enhancement was in good agreement with the concentrations of cationic species of heterocyclic compounds at corresponding pH conditions. Consequently, the enhancement of amorphous silica dissolution is likely to be influenced by the electrostatic complexation of the cationic species of the heterocyclic compounds with the negative >SiO- sites on the amorphous silica surface.
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Reference:
Pyridazine – Wikipedia,
,Pyridazine | C4H4N2 – PubChem