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
This note mainly reports a successful preparation of a alumina-pillared layered titanate with a high interlayer spacing through a step-wise exchange process. X-ray diffeaction patterns indicate that the resultant alum...This note mainly reports a successful preparation of a alumina-pillared layered titanate with a high interlayer spacing through a step-wise exchange process. X-ray diffeaction patterns indicate that the resultant alumina-pillared layered titanate has an interlayer spacing of 1.70 nm, which is 0.17 nm higher than that of previously reported,and has a thermal stability over 500℃. The surface area (N2,BET method) of the product is determined to be 72.4 m2.g-1. The N2 adsorption and desorption isotherm of the product demonstrates that the resultant alumina-pillared layered titanate is porous, with both thecropores and mesopores.展开更多
Aim To determine five organic acids in Radix Isatidis . Method The extraction method and the column partition chromatographic conditions were studied. Then a capillary zone electrophoretic method was set up for t...Aim To determine five organic acids in Radix Isatidis . Method The extraction method and the column partition chromatographic conditions were studied. Then a capillary zone electrophoretic method was set up for the determination. Results The linear ranges of quinazolinone acid, n anthranilic acid, benzoic acid, salicylic acid, and syringic acid were 5 52-92 0 μg·mL -1 , 5 12-102 μg·mL -1 , 2 28-84 4 μg·mL-1 , 4 78-159 μg·mL -1 , and 1 74-87 0 μg·mL -1 respectively. Conclusion The established method is accurate and simple.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This note mainly reports a successful preparation of a alumina-pillared layered titanate with a high interlayer spacing through a step-wise exchange process. X-ray diffeaction patterns indicate that the resultant alumina-pillared layered titanate has an interlayer spacing of 1.70 nm, which is 0.17 nm higher than that of previously reported,and has a thermal stability over 500℃. The surface area (N2,BET method) of the product is determined to be 72.4 m2.g-1. The N2 adsorption and desorption isotherm of the product demonstrates that the resultant alumina-pillared layered titanate is porous, with both thecropores and mesopores.
文摘Aim To determine five organic acids in Radix Isatidis . Method The extraction method and the column partition chromatographic conditions were studied. Then a capillary zone electrophoretic method was set up for the determination. Results The linear ranges of quinazolinone acid, n anthranilic acid, benzoic acid, salicylic acid, and syringic acid were 5 52-92 0 μg·mL -1 , 5 12-102 μg·mL -1 , 2 28-84 4 μg·mL-1 , 4 78-159 μg·mL -1 , and 1 74-87 0 μg·mL -1 respectively. Conclusion The established method is accurate and simple.
