| 面向异丁烷脱氢介孔γ-Al2O3基催化剂的合成及其高催化性能 |
| Synthesis and Catalytic Performance of Mesoporousγ-Al2O3 Catalyst for isobutane dehydrogenation |
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| 摘要: 本论文采用溶剂蒸发自组装法调控载体形貌及孔道结构,成功制备了有序介孔氧化铝载体。以铬氧物种为活性组分,碱金属钾为助剂,采用浸渍法制备负载型催化剂,用于异丁烷催化脱氢反应,研究了反应温度、原料流速、催化剂粒径等因素对催化性能的影响。采用X射线粉末衍射、透射电子显微镜、N2物理吸附、氢气程序升温还原及热重等表征方法探讨了载体形貌、孔道结构与催化性能的构效关系,结果表明,低温下有利于控制异丙醇铝的水解和缩合及介孔γ-Al2O3的研制。与常规的γ-Al2O3相比,所制备的介孔γ-Al2O3的有更大的比表面积和良好的有序性,在600℃, 1atm, GHSV=1000h-1, 10wt.% Cr2O3/γ-Al2O3的条件下催化剂为最佳性能,异丁烷的转化率达63.1%,异丁烯的选择性达到85.5%。与传统的催化剂相比,介孔Cr2O3/γ-Al2O3催化剂具有大的比表面积,高度分散的活性组分,优良的催化性能和良好的抗积碳能力。因此,Cr2O3/γ-Al2O3催化剂在异丁烷脱氢应用中具有良好的应用前景。 |
| 关键词: 异丁烷脱氢 异丁烯 氧化铝 催化剂 Cr2O3/γ-Al2O3 |
| 基金项目: |
| Abstract: A thermal stability and ordered mesoporous γ-Al2O3 was synthesized via the improved evaporation induced self-assembly strategy. As the carrier, a series mesoporousCr2O3/γ-Al2O3 catalysts with various Cr content(1-15wt.%)had been successfully prepared by impregnation method. The mesoporous γ-Al2O3 and the catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM),H2 temperature programmed reduction (H2-TPR) and investigated for isobutane catalytic dehydrogenation. The results showed that low temperature process took control of isopropanol aluminum hydrolytic and condensation rate effectively. Mesoporous γ-Al2O3 own larger surface areas and pore volume and increased channel order. Under given condition (600℃, 1atm, GHSV=1000h-1), 10wt.% Cr2O3/γ-Al2O3 catalyst had the best performance, which the conversion of isobutane reached up to 63.1% and the selectivity of isobutene reached up to 85.5%. Compared to the conventional catalyst,the mesoporousCr2O3/γ-Al2O3 catalyst possesses the advantages of larger specific surface area, highly dispersed active components, excellent catalytic property and very strong coking-resistance. Therefore the mesoporousCr2O3/γ-Al2O3 catalyst was considered as a promising catalyst candidate for the isobutane dehydrogenation. |
| Keywords: isobutane dehydrogenation isobutene alumina catalyst Cr2O3/γ-Al2O3 |
| 投稿时间：2016-09-05 修订日期：2017-05-12 |
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