摘要
利用盐酸、硫酸和硝酸三种强酸对海泡石进行改性,考察了酸浓度、反应温度、反应时间对海泡石性能的影响。采用X射线衍射、红外光谱和热重分析对改性海泡石进行表征。结果表明,以三种强酸改性海泡石,盐酸最为适宜;随着酸浓度的增大、反应温度的升高以及反应时间的延长,改性海泡石的脱镁率提高;合适的海泡石改性条件为:用浓度为1mol/L的盐酸改性,反应温度80℃,反应时间2.5h。在此条件下,海泡石的脱镁率约为27%;以改性海泡石作为FCC催化剂基质,可以有效地提高催化剂的比表面积、孔体积以及催化剂中孔的孔体积;同时海泡石带入适量的氧化镁,有利于增强催化剂的抗重金属性能。
Modification of sepiolite by hydrochloric acid,sulfuric acid and nitric acid was carried out. The results showed that hydrochloric acid was suitable for the modification of sepiolite on the whole. The effects of acid concentration,treating temperature and treating time on the Mg removal rate of sepiolite were studied and the modified sepiolite samples were characterized by XRD, FT-IR and TGA. The specific surface area, pore volume and Mg removal rate of sepiolite samples were increased with the increase of acid concentration, treating time and treating temperature. Under the optimum conditions of using 1 mol/L HCl acid,treating at 80 ℃ for 2.5 h,the Mg removal rate of sepiolite was about 27%. The modified sepiolite sample was used as main matrix component in the preparation of FCC catalyst samples and the catalysts properties were compared. The specific surface area, pore volume and mesopore volume of the catalysts having acid modified sepiolite were larger as compared with catalyst having kaoline matrix. Besides, the said catalyst was more metal tolerance due to the incorporation of MgO from the modified sepiolite.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2008年第2期6-11,共6页
Petroleum Processing and Petrochemicals
关键词
海泡石
酸处理
催化剂
基质
sepiolite
acid treating
catalyst
matrix
