文章摘要
徐国皓,余金鹏,徐华胜,陈雅莹,张春秀,王鹏飞.多级孔HZSM-5分子筛的制备及其催化丙烷脱氢反应性能[J].精细化工,2019,36(5):
多级孔HZSM-5分子筛的制备及其催化丙烷脱氢反应性能
Preparation of hierarchical HZSM-5 zeolites and their catalytic performance in propane dehydrogenation
投稿时间:2018-10-18  修订日期:2019-01-14
DOI:
中文关键词: 二次晶化  丙烷脱氢  HZSM-5  多级孔
英文关键词: secondary crystallization  propane dehydrogenation  HZSM-5  hierarchical
基金项目:
作者单位E-mail
徐国皓 上海化工研究院 1447667520@qq.com 
余金鹏 上海化工研究院  
徐华胜 上海化工研究院  
陈雅莹 上海化工研究院  
张春秀 上海化工研究院  
王鹏飞 上海化工研究院 wpf@sricims.com 
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中文摘要:
      以硫酸铝(Al2(SO4)3·18H2O)、硅溶胶、四丙基氢氧化铵(TPAOH)、硝酸铵(NH4NO3)为原料,合成硅铝物质的量比为100的HZSM-5分子筛。采用乙酸钠溶液处理HZSM-5分子筛后加入TPAOH溶液进行二次晶化,通过对处理前后的HZSM-5分子筛负载Pt,制得Pt/HZSM-5催化剂用于丙烷脱氢反应。利用XRD、SEM、XRF、BET、NH3-TPD和H2化学吸附等手段对处理前、后的HZSM-5分子筛进行了表征,考察了不同浓度的TPAOH溶液对HZSM-5分子筛的晶体结构、表面形貌、孔结构、表面酸性及丙烷脱氢性能的影响。结果表明,采用CH3COONa溶液处理后的HZSM-5分子筛在TPAOH溶液中发生了二次晶化,不仅形成了微孔-介孔多级孔结构,还能调变分子筛的表面酸性;当TPAOH溶液浓度为0.3mol/L、晶化温度为170℃、晶化时间为24h时,得到的Pt/HZSM-5催化丙烷的初始转化率和丙烯选择性均达到最高值,分别为34.2%和99.0%。
英文摘要:
      Aluminium sulphate (Al2(SO4)3·18H2O), silica sol, tetrapropylammonium hydroxide (TPAOH) and ammonium nitrate (NH4NO3) were used as the raw materials to synthesize HZSM-5 zeolite with a SiO2/Al2O3 mol ratio of 100. HZSM-5 zeolites were treated by adding TPAOH solution for secondary crystallization after pre-treating with sodium acetate solution. Pt/HZSM-5 catalysts were prepared for propane dehydrogenation by loading Pt on to HZSM-5 zeolites before and after treatment. The sam-ples were characterized by XRD, SEM, XRF, BET, NH3-TPD and H2 chemisorption. The effects of different TPAOH crystallization concentrations on the crystal structure, surface morphology, pore structure, surface acidity and propane dehydrogenation of HZSM-5 zeolites were investigated. The results showed that HZSM-5 zeolite treated with CH3COONa solution was recrystallized in TPAOH solution, which not only formed microporous-mesoporous hierarchical structure, but also modulated the surface acidity of the zeolite. If HZSM-5 zeolite is first pre-treated with CH3COONa and then crystallized for the second time in the presence of 0.3mol/L TPAOH and at 170°C for 24h, the Pt/HZSM-5 catalyst exhibited the highest initial propane conversion and propene selectivity, which were 34.2% and 99.0%, respectively.
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