Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 58, Issue 36, Pages 16431-16441Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b02784
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Funding
- Shanghai Municipal Science and Technology Commission [18JC1412100]
- NSF of China [21773069, 21703069, 21473057, U1462129]
- 973 program from the MOST of China [2011CB201403]
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Thin-sheet Al-fiber-felt-structured Pd/AlOOH/Al-fiber catalysts are developed for the back-end process of semihydrogenation of acetylene. A series of AlOOH/Al-fiber substrates were synthesized by endogenous growth and subsequent annealing in air. Palladium was then dispersed onto the as-obtained substrates by impregnation. The catalyst activity and stability show interesting substrate annealing temperature dependence. The preferred catalyst, obtained by dispersing lower than 0.05 wt % Pd onto the AlOOH/Al-fiber annealed at 100 degrees C, exhibits a high specific activity with the turnover frequency (measured at 40 degrees C) of 0.0167 s(-1), being two times as high as that (0.0083 s(-1)) for the catalyst using a high substrate annealing temperature of 600 degrees C. Low AlOOH/Al-fiber annealing temperature enables the catalysts with hydroxyl-rich surfaces that not only promote the hydrogen activation on Pd but also strengthen the adsorption of acetylene. Notably, the Pd-hydroxyl interaction obviously suppresses carbonaceous deposition, thereby getting the stability improved by a large extent.
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