Role of Cr on Cu-Cr catalyst via direct ethanol dehydrogenation to ethyl acetate
Journal of Environmental Chemical Engineering(2022)
摘要
This study aims to convert ethanol to ethyl acetate and acetaldehyde using the catalytic ethanol dehydrogenation. The Cu-Cr catalysts were prepared via co-precipitation method using chromium (III) nitrate and copper nitrate precursors having different CuO weights between 50 and 80 wt% balancing with Cr2O3. The fresh catalyst was reduced by mixed gas of H2:N2 (10:90%) at 250ºC for 1 and 2 h (the non-reduced sample was also tested for comparative results). The structural properties of Cu-Cr catalysts were investigated by N2 physisorption, XRD, SEM-EDX, H2-TPR, XPS, NH3-TPD, and CO2-TPD. The ethanol dehydrogenation was carried out in a borosilicate glass fixed-bed continuous flow reactor at the specific condition [300 °C, atmospheric pressure, and WHSV = 3 (gethanol gcatalyst−1) h−1]. Based on the results, the ethyl acetate selectivity on 50 Cu-Cr catalyst (Low atomic Cu/Cr ratio) apparently increased by 1.6 times with increasing reduction time to 2 h having the highest ethyl acetate selectivity. Interestingly, the results from ethanol dehydrogenation indicated that the chromium promoter combining with CuxO in the 50 Cu-Cr catalyst increased the dispersion of copper species, facilitated the reduction, and increased the amount of Lewis acid sites. Moreover, the suitable reduction times can alter the distribution of CuCr2O4, Cu+, and Cu0, which resulted in increased ethyl acetate selectivity. The 50 Cu-Cr catalyst also exhibited good stability.
更多查看译文
关键词
Ethanol dehydrogenation,Cu-Cr catalyst,Acetaldehyde,Ethyl acetate
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要