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Selective Dissociation of Dihydrogen over Dioxygen on a Hindered Platinum Surface for the Direct Synthesis of Hydrogen Peroxide
Author(s) -
Yook Sunwoo,
Shin Hyeyoung,
Kim Hyungjun,
Choi Minkee
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201402436
Subject(s) - dissociation (chemistry) , catalysis , chemistry , platinum , selectivity , photochemistry , inorganic chemistry , hydrogen , hydrogen peroxide , organic chemistry
To achieve high catalytic selectivity towards H 2 O 2 from a H 2 /O 2 mixture, HH bonds should be dissociated and OO bonds should be kept intact in the course of the reaction. A major dilemma in catalyst design, however, is that the metal catalysts that dissociate HH bonds have a thermodynamic preference for the dissociation of OO bonds. In this work, the selective dissociation of H 2 over O 2 was realized by the deposition of H 2 ‐selective carbon diffusion layers on a Pt catalyst. Because O 2 cannot access the carbon‐coated Pt surface, O 2 hydrogenation occurs at the carbon surface from spilt‐over hydrogen rather than at the Pt surface on which OO dissociation is likely. This leads to the great suppression of OO dissociation, which allows the highly selective synthesis of H 2 O 2 . Notably, N‐doping of the carbon diffusion layer could increase the selectivity towards H 2 O 2 significantly because of the stabilization of the hydroperoxy radical on the carbon surface.