Zeolite ZSM-35 was synthesized using hexamethyleneimine as an organic template and its crystallographic structure was studied by X-ray diffraction and IR spectroscopy. Its adsorption property was also evaluated.
The new crystalline V-Ti-silicalite with mesoporous MCM-41 type molecular sieve structure is synthesized hydrothermally; The framework IR spectra associated with ESR, Si-29 MAS NMR, DRS and XPS data shows that V and T...The new crystalline V-Ti-silicalite with mesoporous MCM-41 type molecular sieve structure is synthesized hydrothermally; The framework IR spectra associated with ESR, Si-29 MAS NMR, DRS and XPS data shows that V and Ti are simultaneously incorporated into V-TiMCM-41 framework.展开更多
Abstract: Zeolite HZSM-5 calcined at different temperatures were studied by29Si MAS NMR and EPR method. It was concluded that in certain temperature range, dealumination did not necessarily occur simultaneously with f...Abstract: Zeolite HZSM-5 calcined at different temperatures were studied by29Si MAS NMR and EPR method. It was concluded that in certain temperature range, dealumination did not necessarily occur simultaneously with framework dehydroxylation and thus framework Lewis acidic sites emerged. Two processes may be operative with one of them being predominant at different temperatures.展开更多
文摘Zeolite ZSM-35 was synthesized using hexamethyleneimine as an organic template and its crystallographic structure was studied by X-ray diffraction and IR spectroscopy. Its adsorption property was also evaluated.
文摘The new crystalline V-Ti-silicalite with mesoporous MCM-41 type molecular sieve structure is synthesized hydrothermally; The framework IR spectra associated with ESR, Si-29 MAS NMR, DRS and XPS data shows that V and Ti are simultaneously incorporated into V-TiMCM-41 framework.
文摘Abstract: Zeolite HZSM-5 calcined at different temperatures were studied by29Si MAS NMR and EPR method. It was concluded that in certain temperature range, dealumination did not necessarily occur simultaneously with framework dehydroxylation and thus framework Lewis acidic sites emerged. Two processes may be operative with one of them being predominant at different temperatures.
