ABSTRACT

In this study, the esterification reaction of acetic acid with n-propyl alcohol was studied on a sulfated zeolite catalyst to improve the bio-oil obtained by pyrolysis of lignocellulosic biomass. Temperature (323–353 K), sulfuric acid concentration (1–3 M) and time (1–4 hours) were selected as parameters in the preparation of sulfuric acid-modified clinoptilolite samples. Sulfated zeolites samples are characterized by XRF, XRD, and N₂ adsorption/desorption techniques. It was observed that the zeolites treated with sulfuric acid retained their crystal structures, decreased surface areas, and changed SiO₂/Al₂O₃ ratios. Samples modified with sulfuric acid are more effective in the esterification reaction than unmodified zeolite. The increase in sulfuric acid concentration and temperature in the modification process increased the conversion of acetic acid in the esterification reaction. The highest acetic acid conversion (63.8%) was obtained with zeolite treated at 323 K temperature, 3 M sulfuric acid for 1 hour.

摘要

在这项研究中，醋酸与正丙醇的酯化反应在硫酸化沸石催化剂上进行了研究，以改善通过木质纤维素生物质热解获得的生物油。选择温度 (323–353 K)、硫酸浓度 (1–3 M) 和时间 (1–4 小时) 作为制备硫酸改性斜发沸石样品的参数。硫酸化沸石样品通过 XRF、XRD 和 N ₂吸附/解吸技术进行表征。观察到用硫酸处理的沸石保留了它们的晶体结构，减少了表面积，并改变了 SiO ₂ /Al ₂ O ₃比率。用硫酸改性的样品在酯化反应中比未改性的沸石更有效。改性过程中硫酸浓度和温度的增加增加了酯化反应中乙酸的转化率。沸石在 323 K 温度、3 M 硫酸中处理 1 小时获得最高乙酸转化率 (63.8%)。