Effect of synthesis pH on the structure and catalytic properties of FeMo catalysts

Abstract

The effect of pH on polynuclear molybdenum species (isopolymolybdates) synthesis was investigated by Raman spectroscopy.

An Autonomous Electrochemical Discovery Robot that Utilises Probabilistic Algorithms: Probing the Redox Behaviour of Inorganic Materials

“…The formation of the precipitate observed likely originates from the low solubility of tungstic acid at lower pH [36] . Molybdate species conversely redissolve by coordinating with water molecules, forming dimeric complexes and becoming the building blocks for the formation of POMs [37,38] . A volcano relationship between the cathodic peak current and pH was observed for all the metal salts in H 2 SO 4 , which suggests that the reduction process is more favourable in that given range of pH, Figure S27–29.…”

“…[36] Molybdate species conversely redissolve by coordinating with water molecules, forming dimeric complexes and becoming the building blocks for the formation of POMs. [37,38] A volcano relationship between the cathodic peak current and pH was observed for all the metal salts in H 2 SO 4 , which suggests that the reduction process is more favourable in that given range of pH, Figure S27-29. The cathodic peak current of Mo species in H 2 SO 4 peaked around pH 0.7, while the cathodic peak current of W species in H 2 SO 4 peaked around pH 2.0.…”