| 王青青,包桂蓉,马依文,李法社.La改性Cu-Mn-Al催化剂超临界甲醇中催化木质素液化性能研究[J].材料导报,2016,30(14):44-48 |
| La改性Cu-Mn-Al催化剂超临界甲醇中催化木质素液化性能研究 |
| Catalytic Performance of La-modified Cu-Mn-Al Catalyst for Lignin Liquefaction in Supercritical Methanol |
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| DOI：10.11896/j.issn.1005-023X.2016.14.010 |
| 中文关键词: 镧 铜基催化剂 木质素 催化液化 超临界甲醇 |
| 英文关键词: lanthanum, copper-based catalyst, lignin, catalytic liquefaction, supercritical methanol |
| 基金项目:国家自然科学基金(51266003) |
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| 摘要点击次数: 2169 |
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| 中文摘要: |
| 采用并流共沉淀法制备了一系列La改性Cu-Mn-Al类水滑石前体,对La的添加量进行了考察,利用XRD研究了类水滑石前体的物相变化。将类水滑石前体置于500 ℃、空气气氛下焙烧获得La改性Cu-Mn-Al复合氧化物催化剂,并用于超临界甲醇中木质素的催化液化。利用XRD、N2吸附/脱附、H2-TPR等方法研究了La不同添加量对催化剂物化性质、物相结构的影响。考察了在不同反应温度和反应时间下,催化剂对超临界甲醇中木质素液化性能的影响。结果表明:合成前体具有完好的类水滑石物相,并且La的添加能够对焙烧后催化剂的各组分起到很好的分散作用,能够有效提高催化剂活性和稳定性；但La同时具有抑制甲醇重整的效果,催化剂中La含量过多在较低温度下不利于提高木质素转化率。 |
| 英文摘要: |
| A series of Cu-Mn-Al hydrotalcite modified by La were prepared through parallel flow co-precipita-ting method. The phase change of the hydrotalcite by the addition amount of La was investigated by X-ray diffraction (XRD). The La modified Cu-Mn-Al complex oxide catalyst was obtained by calcining the hydrotalcite at 500 ℃ in air atmosphere and the prepared catalyst was used to catalyze lignin liquefaction in supercritical methanol. The physicochemical properties and structure of catalysts with different addition amount of La were studied by methods of XRD, N2 adsorption/desorption, and H2 temperature programmed reduction (H2-TPR). Effects of different catalysts on lignin conversion in supercritical methanol under different time and temperature were investegated. The results showed that catalyst precursors presented perfect hydrotalcite phase. The addition of La contributed to the dispersion effect on catalyst components after roasting, and could improve catalytic activity and stability effectively. However, La would inhibit the methanol reforming at the same time, and excess La in catalysts would not improve the lignin conversion under low temperature. |
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