Phosphorus-modified mesoporous niobium pentoxide catalyst for fast pyrolysis of cellulose to selective production of levoglucosenone
Phosphorus-modified mesoporous niobium pentoxide catalyst for fast pyrolysis of cellulose to selective production of levoglucosenone
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DOI：
10.1016/j.indcrop.2023.117467
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发表时间：
2023-12
影响因子：
5.9
通讯作者：
Ji Liu;Haowen Fu;Bin Hu;Wan-yu Fu;Kai Li;Li Zhao;Bing Zhang;Qiang Lu
中科院分区：
文献类型：
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作者：
Ji Liu;Haowen Fu;Bin Hu;Wan-yu Fu;Kai Li;Li Zhao;Bing Zhang;Qiang Lu
生物质/纤维素的催化快速热解是生产左旋葡萄糖烯酮（LGO）和其他增值脱水糖的一种有前景的方法。在此，磷酸二氢铵（NH4H2PO4）修饰介孔五氧化二铌（P-Nb2O5）首次应用于选择性生产LGO。该催化剂具有稳定的无定形介孔结构，具有丰富的活性物种（Nb-O-Nb、Nb-O-P、P-OH和PO43-），影响纤维素的脱水和解聚反应，从而改变左旋葡聚糖（LG）和LGO之间的竞争关系。微尺度热解实验表明，在优化条件下（磷负载量为50 wt%，热解温度为400 ℃，催化剂与纤维素质量比为7），LGO的收率达到19.6 wt%。在实验室规模的实验中，LGO的最高收率达到16.5 wt%，并且在五次循环后催化活性仍能保持在80%以上。总体而言，P-Nb2O5 已被证明是一种很有前景的纤维素生产 LGO 催化剂。
Catalytic fast pyrolysis of biomass/cellulose is a promising way for the production of levoglucosenone (LGO) and other value-added anhydrosugars. Herein, ammonium dihydrogen phosphate (NH4H2PO4) modified mesoporous niobium pentoxide (P-Nb2O5) was first applied to selectively produce LGO. The catalyst had a stable amorphous mesoporous structure with abundant activity species (Nb-O-Nb, Nb-O-P, P-OH, and PO43-), which affected the dehydration and depolymerization reactions of cellulose to alter the competing relationship between levoglucosan (LG) and LGO. Micro-scale pyrolysis experiments demonstrated that the yield of LGO reached 19.6 wt% under the optimized condition (P loading of 50 wt%, pyrolysis temperature of 400 °C, and catalyst-to-cellulose mass ratio of 7). In lab-scale experiments, the highest yield of LGO attained 16.5 wt%, and the catalytic activity could maintain over 80% after five recycles. Overall, the P-Nb2O5has been proven to be a promising catalyst to produce LGO from cellulose.