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Sn原子的异质同晶取代AlPO_(4-5)和SAPO_(-5)分子筛的骨架原子从而制得了SnAPO_(-5)和SnSAPO_(-5)样品.这二个样品的DTA谱基本相似.从TPR谱所得结果表明,Sn已进入骨架且不易被还原成零价的Sn.AlPO_(4-5)的IR谱上无羟基峰出现,其表明没有B酸位存在,而SnAPO_(-5)出现了3666cm~(-1)和3620cm~(-1)二个羟基峰,表明有B酸位存在.SnSAPO_(-5)和SAPO_(-5)都有B酸位存在,且酸性相差不大.AlPO_(4-5)和SnAPO_(-5)上的甲醇转化反应仅生成二甲醚,而SAPO_(-5)和SnSAPO_(-5)上则生成碳氢化合物.
(-) and SnSAPO _ (- 5) samples were prepared by the heterogeneous isomorphism of Sn atoms instead of the framework atoms of AlPO 4-5 and SAPO 5 -5 molecular sieves.The DTA spectra of these two samples were similar. The results from the TPR spectrum showed that there was no hydroxyl peak on the IR spectrum of Sn. AlPO_ (4-5), which indicated that there was no B site existed in the IR spectra of Sn. AlPO_ (4-5) There were two hydroxyl peaks of 3666cm -1 and 3620cm -1, indicating the existence of B acid sites.The acid sites of both SsAPO_ (-5) and SAPO_ (-5) Methanol conversion on AlPO_ (4-5) and SnAPO_ (- 5) produced only DME, whereas hydrocarbons on SAPO_ (- 5) and SnSAPO_ (- 5) formed hydrocarbons.