NDLI: The modification of Pd core–silica shell catalysts by functional molecules (KBr, CTAB, SC) and their application to the direct synthesis of hydrogen peroxide from hydrogen and oxygen

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The modification of Pd core–silica shell catalysts by functional molecules (KBr, CTAB, SC) and their application to the direct synthesis of hydrogen peroxide from hydrogen and oxygen

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Xin Lin, Qian He, Shun Pan, Hongyan Chen, Zheng Xiao, Sheng
Copyright Year	2017
Abstract	Pd core–silica shell catalysts (PdX@SiO2, X = KBr, CTAB, SC) were prepared with and without the addition of three different functional molecules, potassium bromide (KBr), cetyltrimethyl ammonium bromide (CTAB) and sodium citrate dihydrate (SC), by the reverse micelle method, and then characterized by TEM, XRD, EDS, XPS and N2 adsorption/desorption. Results showed that the addition of functional molecules decreased the Pd particle size of the catalysts, and Br− of KBr and CTAB were selectively adsorbed on the surface of Pd particles. Among the prepared catalysts, the catalyst PdKBr@SiO2 had the highest H2O2 selectivity (98%) and productivity (716 mmol gPd−1 h−1). Compared with the catalyst Pd@SiO2 prepared without any additional functional molecules, whose H2O2 selectivity and productivity were 26% and 396 mmol gPd−1 h−1, respectively, the H2O2 selectivity and productivity of the catalyst PdKBr@SiO2 were 277% and 81% higher, respectively, than those of the catalyst Pd@SiO2. The reason for this was that the Br− of KBr can be easily selectively adsorbed on the coordinatively unsaturated sites of the Pd particle surface, which could decrease the energy of the Pd surface and restrain side reactions by inhibiting the O–O bond cleavage of O2 and H2O2. And the catalyst PdKBr@SiO2 has better stability and recyclability than the conventional supported catalyst Pd/SiO2. In contrast, the catalyst PdSC@SiO2 had the lowest H2O2 selectivity (23%) and productivity (395 mmol gPd−1 h−1) because the catalyst PdSC@SiO2 prepared with the functional molecule SC and without Br− had the smallest Pd particle size, which can lead to more coordinatively unsaturated sites and increase side reactions.
Starting Page	1415
Ending Page	1422
Page Count	8
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	7
Issue Number	6
Journal	Catalysis Science & Technology
DOI	10.1039/c7cy00105c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen Hydrogen peroxide Potassium bromide Micelle CTAB Bromide X-ray crystallography Transmission electron microscopy Adsorption Sodium citrate Covalent bond KBr Catalyst support
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Effect of Pd Particle Size on the Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen over Pd Core–Porous SiO2 Shell Catalysts

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Silica Bifunctional Supports for the Direct Synthesis of $H_{2}O_{2}$: Optimization of Br/Acid Sites and Pd/Br Ratio

The modification of Pd core–silica shell catalysts by functional molecules (KBr, CTAB, SC) and their application to the direct synthesis of hydrogen peroxide from hydrogen and oxygen

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