Monodisperse NiPd alloy nanoparticles (NPs) are synthesized and assembled on graphene (G) or other support to provide clean, efficient catalysis of tandem reactions—dehydrogenation of ammonia borane (AB) and hydrogenation of R—NO
2
and/or R—CN to R—NH
2
. The tandem reactions proceed quickly and with high efficiency in aqueous methanol solutions at room temperature, and the supported catalyst is readily recovered for re-use, providing a simple, efficient and ‘green’ route to the preparation of many common pharmaceutical, dye or other chemical products. NiPd alloy NPs of 3.4 nanometer size were prepared by co-reduction of nickel(II) acetate and palladium(II) acetlyacetonate by borane-tert-butylamine in oleylamine and deposited on G via a solution phase self-assembly process. The G-NiPd showed composition-dependent catalysis on the tandem reaction with G-Ni
30
Pd
70
being the most active. A variety of R—NO
2
and/or R—CN derivatives (R alkyl or aryl) were reduced selectively into R—NH
2
via G-Ni
30
Pd
70
catalyzed tandem reaction in short (5-30 minute) reaction times with conversion yields reaching up to 100%, demonstrating a new approach to G-NiPd-catalyzed dehydrogenation of AB and hydrogenation of R—NO
2
and R—CN. The G-NiPd NP catalyst is efficient and is reusable; thus the reaction can be performed in an environment-friendly process with short reaction times and high yields.
单分散的NiPd合
金纳米颗粒(NPs)被合成并组装在
石墨烯(G)或其他支撑物上,以提供清洁、高效的串联反应催化作用——
氨硼烷(AB)的脱氢和R—
NO2和/或R—CN的加氢反应形成R—NH2。串联反应在室温下的
水甲醇溶液中迅速高效进行,支撑的催化剂可轻松回收再利用,为制备许多常见的药物、
染料或其他
化学产品提供了简单、高效和“绿色”的途径。通过乙酰基
丙酮硼烷-
叔丁胺在
油胺中共还原
醋酸镍(II)和
醋酸钯(II)制备了3.4纳米尺寸的NiPd合
金NPs,并通过溶液相自组装过程沉积在G上。G-NiPd显示出与组成相关的串联反应催化作用,其中G-Ni30Pd70是最活跃的。通过G-Ni30Pd70催化的串联反应,各种R— 和/或R—CN衍
生物(R烷基或芳基)在短时间(5-30分钟)内选择性地还原为R—NH2,转化率可达100%,展示了G-NiPd催化的
氨硼烷脱氢和R— 以及R—CN的加氢的新方法。G-NiPd NP催化剂高效且可重复使用;因此,反应可以在环保过程中进行,反应时间短,产率高。