Abstract Catalytic pyrolysis of xylan-based hemicellulose over Pt-based bimetallic catalysts supported by activated carbon using Py-GC × GC/MS was carried out to improve the formation of furan compounds. Prior to the experiments, effects of pyrolysis temperature, catalytic temperature, reaction time and catalyst amount on furans production were examined thoroughly. Based on the optimal operation parameters, all of the Pt-based bimetallic catalysts performed better than monometallic Pt catalyst. The rank order of the content of furans was as follows:3%Pt-3%Al/AC > 3%Pt-3%Zr/AC > 3%Pt-3%Re/AC > 3%Pt-3%Fe/AC > 3%Pt-3%Sn/AC > 3%Pt-3%Cu/AC > 3%Pt/AC. The distribution of furan compounds was sensitive to the second metal, and different Pt-based bimetallic catalysts formed different furan products. This suggests that the second metal in the Pt-based bimetallic catalysts exhibits the potential to influence the reaction pathways for the distribution of furans. Furthermore, a series of Pt-Al/AC catalysts with varing Pt and Al loading were introduced to promote the generation of furans. Comparing with 6%Al and 6%Pt, higher content of furans was obtained by the Pt-Al/AC catalysts. It is revealed that synergy exists between Pt and Al. Among the Pt-Al/AC catalysts, 1%Pt-5%Al/AC,which showed mild acidity, achieved the highest furans content of 70.51 %, followed by 4%Pt-2%Al/AC (65.48 %). The major furan compounds, produced by 1%Pt-5%Al/AC, consisted of furan, 2-methylfuran and 2,5-dimethylfuran, and the selectivity values were 47.95 %, 38.49 % and 12.78 %, respectively.

中文翻译：

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木聚糖基半纤维素热解蒸气在活性炭负载 Pt 基双金属催化剂上的催化升级以增加呋喃：分析 Py-GC×GC/MS

摘要 使用 Py-GC × GC/MS 在活性炭负载的 Pt 基双金属催化剂上对木聚糖基半纤维素进行催化热解以改善呋喃化合物的形成。实验前，详细考察了热解温度、催化温度、反应时间和催化剂用量对呋喃产量的影响。基于最佳操作参数，所有 Pt 基双金属催化剂的性能都优于单金属 Pt 催化剂。呋喃含量顺序为：3%Pt-3%Al/AC>3%Pt-3%Zr/AC>3%Pt-3%Re/AC>3%Pt-3%Fe/ AC > 3%Pt-3%Sn/AC > 3%Pt-3%Cu/AC > 3%Pt/AC。呋喃化合物的分布对第二金属敏感，不同的铂基双金属催化剂形成不同的呋喃产物。这表明 Pt 基双金属催化剂中的第二种金属表现出影响呋喃分布的反应途径的潜力。此外，还引入了一系列具有不同 Pt 和 Al 负载量的 Pt-Al/AC 催化剂以促进呋喃的产生。与 6%Al 和 6%Pt 相比，Pt-Al/AC 催化剂获得了更高含量的呋喃。表明 Pt 和 Al 之间存在协同作用。在Pt-Al/AC催化剂中，呈弱酸性的1%Pt-5%Al/AC的呋喃含量最高，为70.51%，其次是4%Pt-2%Al/AC（65.48%）。1%Pt-5%Al/AC制得的主要呋喃化合物为呋喃、2-甲基呋喃和2,5-二甲基呋喃，选择性分别为47.95%、38.49%和12.78%。