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Lattice Oxygen and Feed Oxygen Exchange for the High Rate of H2 + O2 Recombination on Ti1-xPdxO2-x Catalyst at Room Temperature by Prasanna; K. M. Usha; Manish Jain; M. S. Hegde is a Materials Science article available to read on EtoBox.

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The Pd ion substituted TiO 2 , synthesized by solution combustion method crystallizes in anatase structure with stable composition Ti 1-x Pd x O 2-x (x = 0.01-0.03) creating an oxide ion vacancy per Pd 2+ ion substitution. Over 1.35 mol of H 2 per mole of bulk Pd ions, in ~ 5 nm nanocrystalline catalyst Ti 1-x Pd x O 2-x (x = 0.03) is adsorbed at 300 K. On exposure of only hydrogen to Ti 0.98 Pd 0.02 O 1.98 at 300 K, water is formed making the catalyst wet. On heating in a vacuum, mass loss due to water is 0.026 mol /mole of catalyst meaning 1.3 mol of hydrogen per mole of Pd ion in the catalyst. Pd ion substitution in TiO 2 anatase activates lattice oxygen leading to the formation of H 2 O on exposure to H 2 gas at 300 K utilizing lattice oxygen. On heating in air at 650 K the reduced catalyst is regenerated. The catalyst produces a high rate of H 2 + O 2 recombination up to 9 μmoles −1 g −1 at 300 K, and over 230 μmoles −1 g −1 at 330 K with a TOF of 2000 h −1 . The catalyst is coated on cordierite honeycomb avoiding handling of powder catalyst. The rates are highest compared to any catalyst for H 2 + O 2 recombination known so far. Extensive DFT calculation on ( ) surface in Ti

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Author

Prasanna; K. M. Usha; Manish Jain; M. S. Hegde

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Materials Science (Physical Sciences)