MgO改性HZSM-5型分子筛对合成LPG的影响  

Effects of MgO modification to HZSM-5 Zeolite for LPG synthesis

作　　者：吕永兴[1] 吴创之[1] 王铁军[1] 马隆龙[1] 熊祖鸿[1] 周意[1] 

机构地区：[1]中国科学院广州能源研究所,中国科学院可再生能源与天然气水合物重点实验室,广东广州510640

出　　处：《燃料化学学报》2010年第3期313-318,共6页Journal of Fuel Chemistry and Technology

基　　金：国家高技术研究发展计划(863计划,2009AA05Z434);国际科技合作项目(2007DFC60060)

摘　　要：以Mg（NO3）2.6H2O乙醇溶液等体积浸渍分子筛HZSM-5进行改性,与自制的甲醇催化剂（MeLi）机械混合制得合成液化石油气（LPG）双功能催化剂。通过NH3-TPD对改性HZSM-5分子筛酸性表征,在固定床单管反应器上,研究MgO在催化剂中含量对一步法合成LPG的影响,并对催化剂进行寿命实验。结果表明,随着MgO在催化剂中含量的升高,HZSM-5的强酸强度随之降低;MgO在HZSM-5中质量分数在0.25%~1.00%时,催化剂的效果最佳。改性HZSM-5作为脱水催化剂,可提高目标产物的含量,同时大幅度提升催化剂的寿命及稳定性。The modified HZSM-5 zeolite which contains MgO was prepared by impregnating Mg（NO3）2·6H2O ethanol solution with HZSM-5 and then mixed mechanically with methanol catalyst（MeLi） for LPG synthesis.The effects of MgO were investigated in a fixed bed reactor for LPG synthesis.The result showed that with increase of the MgO addition,the strong acid of HZSM-5 zeolite was decreased.The best mass content of MgO in the HZSM-5 was between 0.25%～1.00%.The hybrid catalyst,which consisted of modified HZSM-5 and MeLi,demonstrated a high activity,high selectivity to the target product C3 and C4 hydrocarbons and long catalyst lifetime.

关 键 词：HZSM-5分子筛 氧化镁 催化剂 液化石油气合成 

分 类 号：TQ517.2[化学工程]