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- W2807808507 abstract "Abstract Unsupported, bulk phase palladium sulfide has been studied for the selective hydrogenation of acetylene. The sample underwent significant change during thermal pretreatments, the extent of which depends on temperature. Exposure to hydrogen at temperatures of 150 °C or above results in the loss of sulfur from the sample, primarily as hydrogen sulfide. As sulfur is lost, the sample is progressively transformed from a sulfur rich phase (PdS) to a sulfur lean phase (Pd4S) via an intermediate phase (Pd16S7). Reduction at 250 °C produces a material, which contains Pd4S as the surface phase, whereas reduction at 350 °C results in a largely pure Pd4S phase. Thermal treatments which produce a Pd4S surface display excellent catalytic properties. At complete acetylene conversion at 250 °C, ethylene selectivities of 82.8% and 90.0% were obtained under non-competitive and competitive conditions, respectively. Beneficial catalytic properties arise from the uniformity of Pd sites due to the crystal structure of Pd4S along with electronic influences on the adsorption/desorption processes arising from sulfur neighbours. No indications of deactivation or significant deposition of carbon were observed over Pd4S sample after 50 h on stream." @default.
- W2807808507 created "2018-06-21" @default.
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- W2807808507 date "2018-08-01" @default.
- W2807808507 modified "2023-10-12" @default.
- W2807808507 title "Evolution of palladium sulfide phases during thermal treatments and consequences for acetylene hydrogenation" @default.
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- W2807808507 doi "https://doi.org/10.1016/j.jcat.2018.05.018" @default.
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