镁磷酸铝分子筛MAPO-34的合成  

Synthesis of Magnesium Aluminophosphate Molecular Sieve MAPO-34

作　　者：李宏愿[1] 梁娟[1] 董娜 刘子明[1] 赵素琴[1] 应慕良[1] 

机构地区：[1]中国科学院大连化学物理研究所

出　　处：《石油化工》1989年第1期34-40,共7页Petrochemical Technology

摘　　要：用水热法合成 MAPO-34分子筛。当水和结构导向剂特定时,在 Mg-P-Al 三组份相图上给出的生成 MAPO-34的纯相区域是 Al_2O_3≤MgO=0.5-3.0,P_2O_5/Al_2O_3=0.5-2.0和 P_2O_5/MgO=0.5-3.0,考察了反应混合物 pH 值对结晶相的影响,当 pH=5.0-7.5时,产物为纯 MAPO-34。测定出的 MAPO-34的成核活化能和结晶活化能分剐是37.11千焦/摩尔和60.46千焦/摩尔。当 MgO 被 ZnO 和 Co_2O_3和 TiO_2代替时,台成出 ZAPO-34、CoAPO-34和 TiAPO-34。在合成MAPO-34的反应混合物中加入 SiO_2,合成出了 MAPSO-34。HMAPO-34作为甲醇转化为低碳烯烃的催化剂,产物中 C_2=/C_3=比可达3.14,几乎没有 C_4组份。Navel molecular sieve of MAPO-34 was prepared by hydrothermal synthesis.The appropriatecomposition zone of the forination of pure MAPO-34 given in Mg-P-Al phase diagram is Al_2O_3/MgO=0.5—3.0,P_(?)O_5/Al_2O_3=0.5—2.0 and P_2O_5/MgO=0.5—3.0.The influence of pH of the reaction mixture on the characteristicof product phase was investigated.When pH=5.0—7.5,the product is pureMAPO-34.The apparent activation energies for nucleation and crystallizationmeasured by test are 8.87kcal/mole and 14.45kcal/mole respectively.When MgO wassubstituted by ZnO,Co_2O_3 or TiO_2,ZAPO-34,CoAPO-34 and TiAPO-34 could besynthesized.By adding SiO_2 into the system for the formation of MAPO-34 MA-PSO-34 can be prepared.In the reaction of methanol conversion to hydrocarbonsover HMAPO-34 the C_2~=/C+3~= ratio may reach up to 3.14,and there are practicallyno C_4 in the product mixture.

关 键 词：镁磷酸铝 分子筛 MAPO-34 水热法 

分 类 号：O613.62[理学—无机化学]