The ordered mesoporous aluminosilicate molecular sieve （MASMS-1） stable in the high-temperature steam has been successfully synthesized from the assembly of diluted ZSM-5-type precursor with mesoporous MCM-41. The m...The ordered mesoporous aluminosilicate molecular sieve （MASMS-1） stable in the high-temperature steam has been successfully synthesized from the assembly of diluted ZSM-5-type precursor with mesoporous MCM-41. The material was characterized by XRD, N2 adsorption-desorption, FE-SEM, TEM, FT-IR spectroscopy and 27A1 MAS NMR techniques. This mesoporous material shows high stability in the high-temperature steam [H2O （φ=20%） in N2 at 800 ℃ for 4 h], which might be ascribed to the synergistic effect of both thick walls containing zeolite-like five-membered ring subunits and highly condensed surface silanol groups.展开更多
Using tetrapropylammonium bromide(TPABr)as a template,molecular sieve Ni-ZSM-5 and its single crystals were synthesized in a nonalkaline system in the presence of fluoride ions.By means of XRD,IR,EPMA,MAS NMR,EPR,DTA ...Using tetrapropylammonium bromide(TPABr)as a template,molecular sieve Ni-ZSM-5 and its single crystals were synthesized in a nonalkaline system in the presence of fluoride ions.By means of XRD,IR,EPMA,MAS NMR,EPR,DTA and H_2-TPR techniques,it is proved that the hetero-atom,nickel,is really located in the zeolite framework.And finally,Ni-ZSM-5 was found to have high catalytic cracking reactivity.展开更多
Aluminophosphate(AlPO)and silicoaluminophosphate(SAPO)molecular sieves are an important class of open-framework crystalline materials with wide applications thanks to their molecular-scale selectivity,moderate/strong ...Aluminophosphate(AlPO)and silicoaluminophosphate(SAPO)molecular sieves are an important class of open-framework crystalline materials with wide applications thanks to their molecular-scale selectivity,moderate/strong acidity and excellent(hydro)thermal stability.In recent decades,the manufacturing of new microporous solids with ordered structures has been widely investigated and many effective methods have been developed,which enriches the material types and broadens their applications beyond the traditional use as catalysts and adsorbents.However,the development on the synthesis of AlPO/SAPO molecular sieves is still insufficient and lags behind the needs of applications.Herein,we summarize the work on the seed-assisted synthesis of AlPO/SAPO molecular sieves compared with the zeolite synthetic system,aiming to prompt the synthesis and application of AlPO/SAPO molecular sieves.展开更多
基金Project supported by Key Program of National Natural Science Foundation of China （Nos. 20433030, 90610002）, the National High-Tech Research and Development Program of China （No. 2006AA03Z328）, and the Natural Science Foundation of Zhejiang Province （No. Z406142）.
文摘The ordered mesoporous aluminosilicate molecular sieve （MASMS-1） stable in the high-temperature steam has been successfully synthesized from the assembly of diluted ZSM-5-type precursor with mesoporous MCM-41. The material was characterized by XRD, N2 adsorption-desorption, FE-SEM, TEM, FT-IR spectroscopy and 27A1 MAS NMR techniques. This mesoporous material shows high stability in the high-temperature steam [H2O （φ=20%） in N2 at 800 ℃ for 4 h], which might be ascribed to the synergistic effect of both thick walls containing zeolite-like five-membered ring subunits and highly condensed surface silanol groups.
文摘Using tetrapropylammonium bromide(TPABr)as a template,molecular sieve Ni-ZSM-5 and its single crystals were synthesized in a nonalkaline system in the presence of fluoride ions.By means of XRD,IR,EPMA,MAS NMR,EPR,DTA and H_2-TPR techniques,it is proved that the hetero-atom,nickel,is really located in the zeolite framework.And finally,Ni-ZSM-5 was found to have high catalytic cracking reactivity.
基金This work was supported by the National Natural Science Foundation of China(Nos.21991090,21991091,22171259)the Innovation Research Foundation of Dalian Institute of Chemical Physics,Chinese Academy of Sciences(No.DICP I201909).
文摘Aluminophosphate(AlPO)and silicoaluminophosphate(SAPO)molecular sieves are an important class of open-framework crystalline materials with wide applications thanks to their molecular-scale selectivity,moderate/strong acidity and excellent(hydro)thermal stability.In recent decades,the manufacturing of new microporous solids with ordered structures has been widely investigated and many effective methods have been developed,which enriches the material types and broadens their applications beyond the traditional use as catalysts and adsorbents.However,the development on the synthesis of AlPO/SAPO molecular sieves is still insufficient and lags behind the needs of applications.Herein,we summarize the work on the seed-assisted synthesis of AlPO/SAPO molecular sieves compared with the zeolite synthetic system,aiming to prompt the synthesis and application of AlPO/SAPO molecular sieves.
