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- W2066561880 abstract "Abstract The adsorption and hydrogenation of C = C in α-methylcinnamic acid in dichloromethane over the concentration range 2–16 mM have been studied on Al2O3 and Pd/Al2O3 using in-situ attenuated total reflection infrared (ATR-IR) spectroscopy. For Al2O3, the spectra reveal that the acid adsorbs both molecularly and dissociatively, while for 1 wt.% Pd/Al2O3 only the latter is observed. In the case of molecular adsorption, C = O stretching vibrations arising from adsorbed monomer (1710 cm− 1) and dimer (1684 cm− 1) species were observed. In the case of dissociatively adsorbed carboxylate, the typical asymmetric (1522 cm− 1) and symmetric (1378 cm− 1) vibrations are observed. No changes in adsorbed species were observed in the presence of solution-phase H2 over alumina, whereas significant changes occurred for Pd/Al2O3. While bands associated with monomer/dimer and carboxylate species still persist on the surface in the presence of H2, new vibrational features associated with adsorbed product (i.e., α-methylhydrocinnamic acid) are detected. The results demonstrate that the product is strongly adsorbed under hydrogenation conditions, which likely influences the catalytic performance of this system." @default.
- W2066561880 created "2016-06-24" @default.
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- W2066561880 date "2012-01-01" @default.
- W2066561880 modified "2023-09-24" @default.
- W2066561880 title "In-situ ATR-IR investigation of methylcinnamic acid adsorption and hydrogenation on Pd/Al2O3" @default.
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- W2066561880 doi "https://doi.org/10.1016/j.catcom.2011.09.040" @default.
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