Page 168 - 《精细化工》2023年第11期

第 40 卷第 11 期 精 细 化 工 Vol.40, No.11
2 023 年 11 月 FINE CHEMICALS Nov. 2023

催化与分离提纯技术
硅灰基介孔 ZSM-5 分子筛的合成及催化裂解性能

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伏洪兵，高天画，李兴宾，葛虎城，顾恒硕，顾宇飞，李志霞
（广西大学 化学化工学院，广西 南宁 530004）

摘要：采用工业废弃物硅灰（SF）为原料，淀粉为模板剂通过水热活化-晶化两步法制备了介孔 ZSM-5 分子筛
〔DFZ-y-z，y 代表在第几步晶化过程中添加淀粉；z 代表淀粉的添加量，是以酸洗硅灰（SF-A）中 SiO 2 质量为
基准〕。采用 XRD、SEM、氮气吸附-脱附及 NH 3 -TPD 对催化剂的晶型、形貌、孔道结构及酸性特征进行了表
征，评价了催化剂对低密度聚乙烯（LDPE）和木质素（AL）的共裂解性能。结果表明，DFZ-2-10%的相对结
晶度为 73.4%，总酸量为 1.15 mmol/g，呈现长轴约为 3 μm 的柱状晶粒形貌，孔径分布为 3.5~5.0 nm。当以
DFZ-2-10%为催化剂（用量 0.3 g），LDPE 与 AL 质量比为 1∶1（固体原料 0.3 g）时，苯、甲苯、乙苯和二甲
苯（BTEX）的选择性达到 91.86%，高于商业 ZSM-5（CZ，86.31%），也高于单独裂解 LDPE 与 AL 时的 BTEX
选择性。并且，共裂解时获得的 BTEX 产率（22.94%）明显高于理论 BTEX 产率（18.18%），说明催化共裂解
过程中两种原料之间在促进 BTEX 生产方面具有协同效应。
关键词：硅灰；工业废弃物利用；ZSM-5；催化裂解；木质素；BTEX；催化技术
中图分类号：TQ426.94 文献标识码：A
文章编号：1003-5214 (2023) 11-2480-07 开放科学 (资源服务) 标识码 (OSID)：

Synthesis and catalytic cracking performance of silica-ash-based
mesoporous ZSM-5 molecular sieve

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FU Hongbing, GAO Tianhua, LI Xingbin, GE Hucheng, GU Hengshuo, GU Yufei, LI Zhixia
（School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China）

Abstract: Mesoporous ZSM-5 zeolite [DFZ-y-z, y represents the step at which starch is added in the
crystallization process; z represents the amount of starch added, based on the mass of SiO 2 in pickling silica
fume (SF-A)] was synthesized from industrial waste silica fume (SF) and starch via a hydrothermal
activation-crystallization two-step process. The crystalline shape, morphology, pore structure and acidic
characteristics of the ZSM-5 zeolite obtained were characterized by XRD, SEM, N 2 adsorption and
desorption as well as NH 3-TPD, followed by evaluation on its catalytic cracking performance for low
density polyethylene (LDPE) and lignin (AL). The results showed that the DFZ-2-10% had relative
crystallinity and total acid amount of 73.4% and 1.15 mmol/g, and was columnar particle with long axis of
about 3 μm with pore size distribution between 3.5~5.0 nm. When co-cracking of LDPE and AL with mass
ratio of 1∶1(dosage of 0.3 g) was carried out, taking DFZ-2-10% as an example (dosage of 0.3 g), the
selectivity to benzene, toluene, ethylbenzene and xylene (BTEX) reached 91.86%, higher than that of
commercial ZSM-5 (CZ, 86.31%) and that from cracking of LDPE and AL alone. Moreover, the BTEX
yield from co-cracking (22.94%) was significantly higher than the theoretical BTEX yield (18.18%),
indicating that there was a synergistic effect between two feedstocks in improving BTEX production during
catalytic co-cracking process.
Key words: silica fume; industrial waste utilization; ZSM-5; catalytic cracking; lignin; BTEX; catalysis
technology

收稿日期：2023-04-08; 定用日期：2023-05-16; DOI: 10.13550/j.jxhg.20230287
基金项目：国家自然科学基金项目（22078076）；广西自然科学基金项目（2020GXNSFAA159174）
作者简介：伏洪兵（1998—），男，硕士生，E-mail：75780346@qq.com。联系人：李志霞（1970—），女，教授，E-mail：zhixiali@gxu.edu.cn。