Five samples of SiMCM-41, AlSiMCM-41, FeSiMCM-41, LaSiMCM-41 andAILaSiNCM-41 were synthesised and their good thermal stability was proved-by TG/DTAand XRD. All the samples were thermal stable up to abode 1150-1160 K. ...Five samples of SiMCM-41, AlSiMCM-41, FeSiMCM-41, LaSiMCM-41 andAILaSiNCM-41 were synthesised and their good thermal stability was proved-by TG/DTAand XRD. All the samples were thermal stable up to abode 1150-1160 K. LaSiMCM-41 andFeSiMCM-41 showed better hydrothermal stability. Due to the cllalinel diameter within 1.5-10 urn, the synthesis ofmesoPOrous molecularsieve MCM41 by Mobil in 1992 anew new light on the conventional concept of SyntheSisofarelitCslll. For its POtential application, the studies on this novel matchal family are veryactive reCently, but few papers t'.ere published about their thennal and hydrithennal stability.展开更多
FeY zeolites were prepared by three different secondary synthetic methods. Samples were characterized with XRD, IR, ESR, MBS and XPS techniques. The results showed that more iron ions were inserted into the framework ...FeY zeolites were prepared by three different secondary synthetic methods. Samples were characterized with XRD, IR, ESR, MBS and XPS techniques. The results showed that more iron ions were inserted into the framework of zeolite when the sample was pretreated with (NH4)(2)SiF6 aqueous solution. The structure of such zeolites has obviously changed due to the iron ions inserted into the framework.展开更多
文摘Five samples of SiMCM-41, AlSiMCM-41, FeSiMCM-41, LaSiMCM-41 andAILaSiNCM-41 were synthesised and their good thermal stability was proved-by TG/DTAand XRD. All the samples were thermal stable up to abode 1150-1160 K. LaSiMCM-41 andFeSiMCM-41 showed better hydrothermal stability. Due to the cllalinel diameter within 1.5-10 urn, the synthesis ofmesoPOrous molecularsieve MCM41 by Mobil in 1992 anew new light on the conventional concept of SyntheSisofarelitCslll. For its POtential application, the studies on this novel matchal family are veryactive reCently, but few papers t'.ere published about their thennal and hydrithennal stability.
文摘FeY zeolites were prepared by three different secondary synthetic methods. Samples were characterized with XRD, IR, ESR, MBS and XPS techniques. The results showed that more iron ions were inserted into the framework of zeolite when the sample was pretreated with (NH4)(2)SiF6 aqueous solution. The structure of such zeolites has obviously changed due to the iron ions inserted into the framework.
