Abstract
The introduction of low levels of Pt dopant into AuPd nanoparticles supported on TiO2 significantly enhances their catalytic performance for the direct synthesis of H2O2.
Highlights
Hydrogen peroxide (H2O2) is a versatile, environmentally friendly oxidant that finds applications as a bleaching agent in the pulp and textile industry,[1] the treatment of waste streams[2,3] and is finding growing use in the production of both commodity and fine chemicals
In keeping with numerous previous studies, the co-immobilisation of Au and Pd is seen to result in an enhancement in catalytic activity towards H2O2 synthesis[35] (81 molH2O2 kgcat−1 h−1), far greater than the activity observed over a physical mixture of the two mono-metallic catalysts (7 molH2O2 kgcat−1 h−1)
It should be noted that the H2O2 synthesis activity of the 1% AuPd/TiO2 catalyst, prepared via the sol-immobilisation procedure is comparable to that observed for an analogous catalyst prepared via modified impregnation, where relatively high concentrations of HCl are utilized to enhance metal dispersion, (80 molH2O2 kgcat−1 h−1)[35] and somewhat greater than that for the analogous catalyst prepared by conventional wet-impregnation (64 molH2O2 kgcat−1 h−1)
Summary
Hydrogen peroxide (H2O2) is a versatile, environmentally friendly oxidant that finds applications as a bleaching agent in the pulp and textile industry,[1] the treatment of waste streams[2,3] and is finding growing use in the production of both commodity and fine chemicals. Process, first developed by BASF in 1939.9 The AO process has undergone numerous improvements since, but the underlying chemistry has changed little, utilising H2, O2 and an anthraquinone derivative, where the anthraquinone molecule undergoes sequential hydrogenation and oxidation steps to generate H2O2, while avoiding the risk of combining H2 and O2 directly. This process is able to initially yield H2O2 concentrations of 1–2 wt%, which through further distillation and purification steps can be raised to exceed 70 wt%; a concentration which can be shipped and stored prior to dilution at point of use. The instability of H2O2, undergoing rapid decomposition to H2O at relatively mild temperatures or in the presence of weak bases requires the use of acidic stabilising agents, which result in additional purification steps to prevent contamination of product streams and decreased reactor lifetime due to corrosion, raising costs to the end user
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