Effect of Zn/ZSM-5 and FePO4 Catalysts on Cellulose Pyrolysis
Effect of Zn/ZSM-5 and FePO4 Catalysts on Cellulose Pyrolysis
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Zn/ZSM-5 和 FePO4 催化剂对纤维素热解的影响
DOI：
10.1155/2015/749875
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发表时间：
2015
影响因子：
3
通讯作者：
Songlin Zuo
中科院分区：
文献类型：
--
作者：
Haian Xia;Xiaopei Yan;Si;Li Yang;Yuejie Ge;Jing Wang;Songlin Zuo
采用一系列不同Zn含量和FePO4的Zn/ZSM-5催化剂热解纤维素生产增值化学品。这些催化剂的性质通过氨温程序脱附 (NH3-TPD)、吡啶吸附的红外光谱和 X 射线衍射 (XRD) 技术进行了表征。采用热重（TG）技术研究了纤维素的非催化和催化热解行为。通过气相色谱-质谱（GC-MS）分析热解液体产物，即生物油。生物油的主要成分是脱水糖，例如左旋葡聚糖 (LGA)、1,6-脱水-β-D-呋喃葡萄糖 (AGF)、左旋葡萄糖酮（LGO、1,6-脱水-3,4-二脱氧-β-D-吡喃森-2-酮）和 1,4:3,6-二脱水-α-D-吡喃葡萄糖 （DGP），以及呋喃衍生物、醇类等。研究发现具有布朗斯台德酸位和路易斯酸位的 Zn/ZSM-5 样品以及具有路易斯酸位的 FePO4 催化剂对纤维素的热解行为和产物分布具有显着影响。这些结果表明，Bronsted 和 Lewis 酸位点显着修饰了生物油的成分，从而促进了呋喃化合物和 LGO 的产生。基于这些发现，提出了一个模型来描述固体酸催化剂催化纤维素的热解途径。
A series of Zn/ZSM-5 catalysts with different Zn contents and FePO4 were used to pyrolyze cellulose to produce value added chemicals. The nature of these catalysts was characterized by ammonia-temperature programmed desorption (NH3-TPD), IR spectroscopy of pyridine adsorption, and X-ray diffraction (XRD) techniques. Noncatalytic and catalytic pyrolytic behaviors of cellulose were studied by thermogravimetric (TG) technique. The pyrolytic liquid products, that is, the biooils, were analyzed by gas chromatography-mass spectrometry (GC-MS). The major components of the biooils are anhydrosugars such as levoglucosan (LGA), 1,6-anhydro-β-D-glucofuranose (AGF), levoglucosenone (LGO, 1,6-anhydro-3,4-dideoxy-β-D-pyranosen-2-one), and 1,4:3,6-dianhydro-α-D-glucopyranose (DGP), as well as furan derivatives, alcohols, and so forth. Zn/ZSM-5 samples with Bronsted and Lewis acid sites and the FePO4 catalyst with Lewis acid sites were found to have a significant effect on the pyrolytic behaviors of cellulose and product distribution. These results show that Bronsted and Lewis acid sites modified remarkably components of the biooil, which could promote the production of furan compounds and LGO. On the basis of the findings, a model was proposed to describe the pyrolysis pathways of cellulose catalyzed by the solid acid catalysts.