کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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66567 | 48438 | 2011 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A study of furfural decarbonylation on K-doped Pd/Al2O3 catalysts A study of furfural decarbonylation on K-doped Pd/Al2O3 catalysts](/preview/png/66567.png)
Vapor-phase decarbonylation of furfural to furan was performed on K-doped Pd/Al2O3 catalysts in a fixed-bed reactor. A series of K-doped catalysts were prepared by impregnation method with various potassium salt precursors and different potassium content. The catalyst evaluation results revealed that the doping of K not only promoted the furfural decarbonylation, but also suppressed the hydrogenation side reaction. Among the investigated catalysts, Pd–K2CO3/Al2O3 (K% = 8 wt.%) presented the best performance and achieved the furan yields up to 99.5% at 260 °C. The selectivity of 2-methylfuran would approach zero at high K content (K% > 4 wt.%). Furthermore, the catalysts were characterized by BET, SEM, ICP, H2-TPR, H2-TPD, H2-chemisorption, CO-FTIR, furfural-TPSR, and furfural-FTIR experiments. It was shown that the dopant phase had a remarkable effect on the precursor Pd2+ and the reduced Pd metal particles. Furfural-TPSR and furfural-FTIR exhibited that K-doped catalysts enhanced the furfural adsorption and promoted the decarbonylation reaction, which was due to the different adsorption mode and intensity of furfural on K-doped and undoped samples. Besides, the decrease of C–O adsorption of furfural (η2(C,O)-furfural) by K doping is the main reason for suppressing the furfural hydrogenation.
The furfural-TPSR results exhibit that furan desorption temperature is decreased on K-doped Pd catalysts, which illustrates that K can promote furfural decarbonylation on Pd catalyst.Figure optionsDownload high-quality image (98 K)Download as PowerPoint slideResearch highlights▶ The yield of furan is 99.5% at 260 °C on Pd–K2CO3/Al2O3 (K% = 8 wt.%) catalyst. ▶ The selectivity of 2-methylfuran will be zero at higher K-content catalysts. ▶ Furfural-TPSR indicates that K-doped catalysts promote furfural decarbonylation. ▶ Furfural-FTIR shows that K-doped catalysts change the adsorption mode of furfural. ▶ The decrease of η2(C,O)-furfural by K-doping inhibits furfural hydrogenation.
Journal: Journal of Molecular Catalysis A: Chemical - Volume 335, Issues 1–2, 1 February 2011, Pages 71–81