Citation: Weiwei Lin, Haiyang Cheng, Xiaoru Li, Chao Zhang, FengyuZhao, Masahiko Arai. Layered double hydroxide-like Mg₃Al_1-xFe_x materials as supports for Ir catalysts:Promotional effects of Fe doping in selective hydrogenation of cinnamaldehyde[J]. Chinese Journal of Catalysis, ;2018, 39(5): 988-996. doi: 10.1016/S1872-2067(18)63042-6 shu

Layered double hydroxide-like Mg₃Al_1-xFe_x materials as supports for Ir catalysts:Promotional effects of Fe doping in selective hydrogenation of cinnamaldehyde

Weiwei Lin ^a,b, ,
Haiyang Cheng ^a,b ,
Xiaoru Li ^a,b ,
Chao Zhang ^a,b ,
FengyuZhao ^a,b ,
Masahiko Arai ^a,b

a State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China;
b Jilin Province Key Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China

Received Date: 5 December 2017
Revised Date: 2 February 2018

Fund Project: This work was supported by the National Key Research and Development Program of China (2016YFA0602900), National Natural Science Foundation of China (21603212, 21672204), Youth Innovation Promotion Association CAS (2016206), Jilin Provincial Science and Technology Program of China (20150204050GX), and Chinese Academy of Sciences President's International Fellowship Initiative (2018VCA0012).

Supported Ir catalysts were prepared using layered double hydrotalcite-like materials, such as Mg₃Al_1-xFe_x, containing Fe and Al species in varying amounts as supports. These Ir catalysts were applied for the selective hydrogenation of cinnamaldehyde (CAL). When x was changed from 0 (Ir/Mg₃Al) to 1 (Ir/Mg₃Fe), the rate of CAL hydrogenation reached a maximum at approximately x=0.25, while the selectivity to unsaturated alcohol, i.e., cinnamyl alcohol, monotonously increased from 44.9% to 80.3%. Meanwhile, the size of the supported Ir particles did not change significantly with x, remaining at 1.7 ±0.2 nm, as determined by transmission electron microscopy. The chemical state of Ir and Fe species in the Ir/Mg₃Al_1-xFe_x catalysts was examined by temperature programmed reduction by H₂ and X-ray photoelectron spectroscopy. The surface of the supported Ir particles was also examined through the in-situ diffuse reflectance infrared Fourier-transform of a probe molecule of CO. On the basis of these characterization results, the effects of Fe doping to Mg₃Al on the structural and catalytic properties of Ir particles in selective CAL hydrogenation were discussed. The significant factors are the electron transfer from Fe²⁺ in the Mg₃Al_1-xFe_x support to the dispersed Ir particles and the surface geometry.
- Ir catalyst,
- Layered double hydroxide,
- Fe doping,
- Support effect,
- Selective hydrogenation,
- Cinnamaldehyde
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Layered double hydroxide-like Mg₃Al_1-xFe_x materials as supports for Ir catalysts:Promotional effects of Fe doping in selective hydrogenation of cinnamaldehyde