Mesoporous molecular sieve MCM-41 has been synthesized in the extremely dense system (with H2O/Si<10) and characterized by XRD, N-2 adsorption isotherm as well as probe reactions of cracking of cumene and isomeriza...Mesoporous molecular sieve MCM-41 has been synthesized in the extremely dense system (with H2O/Si<10) and characterized by XRD, N-2 adsorption isotherm as well as probe reactions of cracking of cumene and isomerization of o-xylene.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
文摘Mesoporous molecular sieve MCM-41 has been synthesized in the extremely dense system (with H2O/Si<10) and characterized by XRD, N-2 adsorption isotherm as well as probe reactions of cracking of cumene and isomerization of o-xylene.
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.
