Herein,we first describe the physical mixture of Cu(OH)_2/Fe(OH)_3 as a composite catalyst precursor for the dehydrogenation of ammonia borane(AB)in methanol.During the initial period of catalytic reaction,Cu nanopart...Herein,we first describe the physical mixture of Cu(OH)_2/Fe(OH)_3 as a composite catalyst precursor for the dehydrogenation of ammonia borane(AB)in methanol.During the initial period of catalytic reaction,Cu nanoparticles were formed in-situ.The catalytic activity of Cu nanoparticles can be significantly enhanced with the assistance of Fe species and OH~à.A maximum turnover frequency(TOF)of 50.3 mol_(H2)mol^(à1)_(total metal)min^(à1)(135.6 mol_(H2)mol_(Cu)^(à1)min^(à1))was achieved at ambient temperature,which is superior to those of previously reported Fe or Cu based systems.展开更多
This paper summarizes the results of the coprecipitation of ultramicrogram uranium with Fe（OH）<sub>3</sub> from saturated NaCl solution and separation of uranium from Fe（Ⅲ） by solvent extraction with ...This paper summarizes the results of the coprecipitation of ultramicrogram uranium with Fe（OH）<sub>3</sub> from saturated NaCl solution and separation of uranium from Fe（Ⅲ） by solvent extraction with TBP as extractant. In the first step, the coprecipitation efficiency of uranium is more than 95%; in the second step, extraction percentage of uranium is more than 98%, and stripping efficiency of uranium is nearly 100% （twice stripping） and separation factor （separation of Fe（Ⅲ） from uranium） is more than 10<sup>3</sup>.展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB17000000)the National Natural Science Foundation of China (21773275)
文摘Herein,we first describe the physical mixture of Cu(OH)_2/Fe(OH)_3 as a composite catalyst precursor for the dehydrogenation of ammonia borane(AB)in methanol.During the initial period of catalytic reaction,Cu nanoparticles were formed in-situ.The catalytic activity of Cu nanoparticles can be significantly enhanced with the assistance of Fe species and OH~à.A maximum turnover frequency(TOF)of 50.3 mol_(H2)mol^(à1)_(total metal)min^(à1)(135.6 mol_(H2)mol_(Cu)^(à1)min^(à1))was achieved at ambient temperature,which is superior to those of previously reported Fe or Cu based systems.
文摘This paper summarizes the results of the coprecipitation of ultramicrogram uranium with Fe（OH）<sub>3</sub> from saturated NaCl solution and separation of uranium from Fe（Ⅲ） by solvent extraction with TBP as extractant. In the first step, the coprecipitation efficiency of uranium is more than 95%; in the second step, extraction percentage of uranium is more than 98%, and stripping efficiency of uranium is nearly 100% （twice stripping） and separation factor （separation of Fe（Ⅲ） from uranium） is more than 10<sup>3</sup>.
