通过水热合成法制备了一系列Co₃O₄晶体，利用X射线衍射、扫描电子显微镜以及N₂物理吸附仪等对合成Co₃O₄产物的晶相、形貌以及孔结构参数进行表征，并对其解聚木质素磺酸钙的催化性能进行评价。结果表明，当Co（NO₃）₂为钴源、Co（Ⅱ）初始浓度为0.4 mol/L、NaOH为沉淀剂、反应体系pH为9、晶化温度为220℃、时间为12 h时，合成的Co₃O₄产率为82.3%，结晶度为98.47%，且晶粒呈规则的立方体结构，粒径约为80~90 nm，孔容为0.059 cm³/g。当催化解聚反应温度为260℃、反应时间为5 h、m（CLS）：m（Co₃O₄）=2：1、体系中乙醇体积分数为40%时，液相收率高达58.44%；其中酚类化合物选择性高达55.81%（紫丁香酚类为32.37%，愈创木酚类为7.9%，苯酚类为15.54%）。

A series of Co₃O₄ crystal is prepared via the hydrothermal synthesis method,and its crystal phase,morphology and pore structure are investigated via X-ray diffraction,scanning electron microscopy,N₂ physical adsorption instrument and so on.The catalytic performance of Co₃O₄ crystal in depolymerization of calcium lignosulfonate is also studied.The optimal synthesis conditions are obtained as follows:cobalt nitrate is used as cobalt source,the initial concentration of Co(Ⅱ) is 0.4 mol·L^-1,pH value of the system is regulated to 9 by NaOH,the crystallization temperature remains at 220℃ and the crystallization spends 12 h.Under these conditions,the yield of Co₃O₄ reaches 82.3%,and the crystallinity is 98.47%.The crystal shows regular cubic structure with a particle size of 800-900 nm.The pore volume of the obtained product is 0.059 cm³·g^-1.The liquid phase yield reaches 58.44% when the reaction temperature for the hydrothermal depolymerization of calcium lignosulfonate by Co₃O₄ is at 260℃,the reaction lasts for 5 h,m(CLS)/m(Co₃O₄)=2:1,and the volume fraction of ethanol is 40%.The selectivity of phenolics reaches as high as 55.81% (32.37% for syringols,7.9% for guaiacols,and 15.54% for phenols).