A mesoporous(d=2.3mm)silica-pillared layered tetratita nate with a super gallery(d 001 =1.84mm)was prepared by first preswelling layered tetratitanate with n-dodecyl amine,then reacting with 20wt%NH 2 (CH 2 ) 3 Si (OC...A mesoporous(d=2.3mm)silica-pillared layered tetratita nate with a super gallery(d 001 =1.84mm)was prepared by first preswelling layered tetratitanate with n-dodecyl amine,then reacting with 20wt%NH 2 (CH 2 ) 3 Si (OC 2 H 5 ) 3 aqueous solution,and finally calcinating the resultant solid product i n air at 550℃.All the reaction was carried out hydrothermally in an aut oclave at 130℃.The obtained materia l has a relatively high BET surface area of204m 2 ·g -1 and a thermal stability beyond 600℃.The catalytic application of the material was also investigated by using the dehydration of isopropanol and the reform of n-hexane as two probing reactions.展开更多
Mixtures of H2Ti ￡2￡(r)￡?Mn ￡°￡(r)￡2O￡*￡?CH￡3￡¨CH￡2 ￡(c)9NH2 ,and Si (OC2H5￡(c)4 at molar ratios of 1∶2∶20resulted in swollen and viscous gel once at room temperature,allowing the intercalatio...Mixtures of H2Ti ￡2￡(r)￡?Mn ￡°￡(r)￡2O￡*￡?CH￡3￡¨CH￡2 ￡(c)9NH2 ,and Si (OC2H5￡(c)4 at molar ratios of 1∶2∶20resulted in swollen and viscous gel once at room temperature,allowing the intercalation com pound in which CH￡3￡¨CH￡2￡(c)￡1 NH￡2and Si ￡¨OC￡2H￡μ￡(c)4were simultaneously intercalated i nto interlayers of H￡2Ti ￡2￡(r)￡?Mn ￡°￡(r)￡2O￡* ￡(r)The subsequent hydrolysis of the obtained intercalation compound in pure water solution for 30min at room temperature led to the formation of a new layered H￡2 Ti ￡2￡(r)8Mn 0￡(r)2O7 sample with an interlayer spacing of￡3￡(r)￡?￡μnm￡(r)Calcination of this sample i n air at ￡μ￡°￡°??gave rise to a novel mesoporous￡¨d￡1/2￡3￡(r)￡3nm￡(c)silica-pillared layered H￡2Ti ￡2￡(r)￡?Mn ￡°￡(r)2O7 with a large BET specific area of624m2·g -1 and a super￡-gallery height of ￡3￡(r)￡2￡′nm￡(r)展开更多
Branching carbon nanotubes were synthesized by pyrolysis of acetylene at 700℃ over oxygen free copper and γ Al2O3 supported Cu unitary or Cu/Fe binary catalysts. The morphologies of the as grown products were charac...Branching carbon nanotubes were synthesized by pyrolysis of acetylene at 700℃ over oxygen free copper and γ Al2O3 supported Cu unitary or Cu/Fe binary catalysts. The morphologies of the as grown products were characterized by transmission electron microscopy. The results indicated that the branching structures were closely related to the Cu component of the catalysts. We proposed that the special electronic structure (3d104s1) of Cu play the crucial role in the formation of the heptagon defects related to the branching structures.展开更多
文摘A mesoporous(d=2.3mm)silica-pillared layered tetratita nate with a super gallery(d 001 =1.84mm)was prepared by first preswelling layered tetratitanate with n-dodecyl amine,then reacting with 20wt%NH 2 (CH 2 ) 3 Si (OC 2 H 5 ) 3 aqueous solution,and finally calcinating the resultant solid product i n air at 550℃.All the reaction was carried out hydrothermally in an aut oclave at 130℃.The obtained materia l has a relatively high BET surface area of204m 2 ·g -1 and a thermal stability beyond 600℃.The catalytic application of the material was also investigated by using the dehydration of isopropanol and the reform of n-hexane as two probing reactions.
文摘Mixtures of H2Ti ￡2￡(r)￡?Mn ￡°￡(r)￡2O￡*￡?CH￡3￡¨CH￡2 ￡(c)9NH2 ,and Si (OC2H5￡(c)4 at molar ratios of 1∶2∶20resulted in swollen and viscous gel once at room temperature,allowing the intercalation com pound in which CH￡3￡¨CH￡2￡(c)￡1 NH￡2and Si ￡¨OC￡2H￡μ￡(c)4were simultaneously intercalated i nto interlayers of H￡2Ti ￡2￡(r)￡?Mn ￡°￡(r)￡2O￡* ￡(r)The subsequent hydrolysis of the obtained intercalation compound in pure water solution for 30min at room temperature led to the formation of a new layered H￡2 Ti ￡2￡(r)8Mn 0￡(r)2O7 sample with an interlayer spacing of￡3￡(r)￡?￡μnm￡(r)Calcination of this sample i n air at ￡μ￡°￡°??gave rise to a novel mesoporous￡¨d￡1/2￡3￡(r)￡3nm￡(c)silica-pillared layered H￡2Ti ￡2￡(r)￡?Mn ￡°￡(r)2O7 with a large BET specific area of624m2·g -1 and a super￡-gallery height of ￡3￡(r)￡2￡′nm￡(r)
文摘Branching carbon nanotubes were synthesized by pyrolysis of acetylene at 700℃ over oxygen free copper and γ Al2O3 supported Cu unitary or Cu/Fe binary catalysts. The morphologies of the as grown products were characterized by transmission electron microscopy. The results indicated that the branching structures were closely related to the Cu component of the catalysts. We proposed that the special electronic structure (3d104s1) of Cu play the crucial role in the formation of the heptagon defects related to the branching structures.
