Citation: Hong Yi, Yujia Xia, Huan Yan, Junling Lu. Coating Pd/Al₂O₃ catalysts with FeO_x enhances both activity and selectivity in 1,3-butadiene hydrogenation[J]. Chinese Journal of Catalysis, ;2017, 38(9): 1581-1587. doi: 10.1016/S1872-2067(17)62768-2 shu

Coating Pd/Al₂O₃ catalysts with FeO_x enhances both activity and selectivity in 1,3-butadiene hydrogenation

Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials(iChEM), CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei 230026, Anhui, China

Received Date: 26 November 2016
Revised Date: 30 December 2016

Fund Project: This work was supported by the One Thousand Young Talents Program under the Recruitment Program of Global Experts, the National Natural Sci-ence Foundation of China (21673215, 51402283, 21473169), and the Fundamental Research Funds for the Central Universities (WK2060030017), and the Startup Funds from University of Science and Technology of China.

Pd-based catalysts are widely used in hydrogenation reactions, and it is essential to improve the selectivity of these catalysts to give the desired products, especially at high conversions. However, improvements in selectivity have generally been achieved at the expense of catalytic activity. Here, we report that deposition of FeO_x onto a Pd/Al₂O₃ catalyst using atomic layer deposition with pre-cise, near atomic control provides a remarkable improvement in both activity and butene selectivity in the selective hydrogenation of 1,3-butadiene under mild conditions. Diffuse reflectance infrared Fourier transform spectroscopy for CO chemisorption measurements illustrate that FeO_x preferen-tially nucleates on Pd (111) facets and divides the Pd surface atoms into small ensembles. X-ray photoelectron spectroscopy measurements revealed that the Pd became electron deficient after FeO_x deposition owing to the strong Pd-FeO_x interaction. Our results suggest that a geometric effect, that is, the formation of small Pd ensembles, is the main contributor to the improvement in butene selectivity, whereas the enhancement in hydrogenation activity may be attributed to both electronic effects and the newly generated Pd-FeO_x interface.
- Palladium catalyst,
- Atomic layer deposition,
- Hydrogenation,
- 1,3-Butadiene,
- Selectivity,
- Activity,
- Strong metal support interaction
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Coating Pd/Al2O3 catalysts with FeOx enhances both activity and selectivity in 1,3-butadiene hydrogenation

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Coating Pd/Al₂O₃ catalysts with FeO_x enhances both activity and selectivity in 1,3-butadiene hydrogenation