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.
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