摘要
采用不同浓度的NaOH溶液对Hβ分子筛进行碱处理改性,利用XRD、N_(2)吸附-脱附、ICP、NH_(3)-TPD等手段进行表征,并研究了其用于乙烯焦油加氢精制典型产物四氢萘的加氢裂解反应行为。结果表明:与Hβ原粉相比,碱处理分子筛表现出更优的加氢裂解反应性能,这主要是由于碱处理后,分子筛的介孔比例显著增加,促进了大分子的扩散和吸附;且碱处理降低了分子筛的酸性,在一定程度上抑制了烷基化和氢转移等副反应,促进了烷基苯的生成。以四氢萘为反应原料,采用0.5 mol·L^(-1)的NaOH溶液处理的Hβ分子筛作为载体制得的加氢裂解催化剂,反应200 h后四氢萘的转化率高于97.0%,烷基苯的选择性为84.8%,表现出良好的加氢裂解反应性能。
The Hβzeolites were modified through alkali treatment using NaOH solutions of various conc-entrations and characterized by X-ray diffraction(XRD),nitrogen adsorption-desorption,inductively coupled plasma(ICP)spectroscopy,and ammonia temperature-programmed desorption(NH_( 3)-TPD).These materials were subsequently employed to investigate the hydrocracking behavior of tetralin,a representative compound derived from ethylene tar hydrorefining.Compared with untreated Hβpowder,the alkali-treated zeolites exhibited superior hydrocracking performance.This improvement can be attributed to a significant increase in mesoporous volume following alkali treatment,which enhances the diffusion and adsorption of macromolecules within the zeolite framework.Additionally,alkali treatment effectively reduces the acidity of the zeolite,thereby inhibiting side reactions such as alkylation and hydrogen transfer,and promoting the formation of alkylbenzene compounds.Notably,Hβzeolite treated with 0.5 mol·L^(-1) NaOH solution demonstrated exceptional catalytic activity.After 200 h of reaction,the conversion of tetralin exceeded 97.0%,with an alkylbenzene selectivity of 84.8%,indicating robust hydrocracking performance.
作者
张妍
马宇春
韩亚梅
余强
ZHANG Yan;MA Yuchun;HAN Yamei;YU Qiang(SINOPEC Shanghai Research Institute of Petrochemical Technology Co.,Ltd.,Shanghai 201208,China)
出处
《工业催化》
2025年第5期66-72,共7页
Industrial Catalysis
关键词
石油化学工程
乙烯焦油
Hβ
碱处理
四氢萘
加氢裂解
petrochemical engineering
ethylene tar
H-beta
alkali treatment
tetralin
hydrocracking
