以自然界中含量丰富的木聚糖类半纤维素为原料，首先采用碳化 － 磺化两步法 制备了木聚糖基固体酸催化剂; 然后对催化剂催化合成苯并呫吨类化合物进行了研究，研 究了催化剂用量、反应温度、反应时间对目标产物产率的影响; 再次，研究了木聚糖基固体 酸催化剂催化合成苯并呫吨类化合物的底物普适性; 最后，对木聚糖基固体酸催化剂的循 环使用性能进行了研究，并对木聚糖基固体酸催化剂的结构和表面形貌进行了表征． 结果 表明: 当反应温度为 90 ℃、反应时间为 2 h、催化剂用量为 40 mg 时，木聚糖基固体酸催化 剂催化合成苯并呫吨类化合物的性能达到最佳; 在文中研究所得的最佳反应条件下，木聚 糖基固体酸催化剂对催化醛类化合物、2-萘酚和环己二酮类化合物具有良好的底物普适 性; 木聚糖基固体酸催化剂在反应体系中稳定性较好，在重复使用 5 次后，其结构没有发 生明显的变化．

Preparation has been made for the xylan-based solid acid catalyst was used in the two steps of carbonization and sulfonation． The catalyst was applied to the synthesis of benzoxanthenes． A study was conducted of the effects of the reaction temperature，time and dosage of the catalyst on the transversion． Furthermore，the universality and reusability of xylan-based solid acid catalyst were also investigated． Meanwhile，the xylan-based solid acid catalyst was characterized by scanning electron microscope ( SEM) ，Fourier transform infrared spectra ( FT-IＲ) and elemental analysis ( EA) ． The results showed that the catalyst exhibited high catalytic performance in the synthesis of benzoxanthene and their derivatives with good yields at 90 ℃ for 2 h in the presence of xylan-based solid acid ( 40 mg) ． The catalyst could be reused for several times without significant loss in its catalytic activity，indicating that the catalyst possessed excellent stability and recyclability