diffraction and transmission electron microscopy techniques. Our studies show that all of these nanoparticles are suitable for the Suzuki–Miyauracoupling (SMC) reaction in water. PtPdCu and PdCu thin films showed higher catalytic activity compared to Pd thin film in the SMC reaction due to the appropriate interaction among palladium, platinum and copper metals.
Formation of dispersed palladium–nickel bimetallic nanoparticles in microemulsions: synthesis, characterization, and their use as efficient heterogeneous recyclable catalysts for the amination reactions of aryl chlorides under mild conditions
作者:Felora Heshmatpour、Reza Abazari
DOI:10.1039/c4ra06958g
日期:——
The amination cross-coupling reaction by Pd–Ni (1 : 1) bimetallic nanoparticles in water solvent.
Pd-Ni(1:1)双金属纳米颗粒在水溶剂中进行的动画交叉偶联反应。
CuPd Nanoparticles as a Robust Catalyst for Electrochemical Allylic Alkylation
carbon support) is designed for catalyzing electrochemical allylic alkylation in water/isopropanol (1:1 v/v) and 0.2 m KHCO3 solution at room temperature. The Pd catalysis was Pd/Cu composition‐dependent, and CuPd NPs with a Pd/Cu ratio close to one are the most efficient catalyst for the selective cross‐coupling of alkyl halides and allylic halides to form C−C hydrocarbons with product yields reaching
设计了一种高效的CuPd纳米颗粒(NP)催化剂(沉积在碳载体上的3 nm CuPd NPs),用于在室温下在水/异丙醇(1:1 v / v)和0.2 m KHCO 3溶液中催化电化学烯丙基烷基化 。Pd的催化作用取决于Pd / Cu的组成,Pd / Cu比率接近1的CuPd NP是烷基卤化物和烯丙基卤化物选择性交叉偶联形成C-C烃的最有效催化剂,产物收率达到高达99%。这种NP催化的电化学烯丙基烷基化扩展了交叉偶联反应的合成范围,并且可以进一步扩展到其他有机反应体系,以开发绿色化学电合成方法。
Hydrogen solubility of bcc PdCu and PdCuAg alloys prepared by mechanical alloying
作者:Jacques Tosques、Bruno Honrado Guerreiro、Manuel H. Martin、Lionel Roué、Daniel Guay
DOI:10.1016/j.jallcom.2016.12.274
日期:2017.3
Abstract Face-centered cubic (fcc) Pd 100−x−y CuxAg y alloys (with x ranging between 0 and 65 at.% and y ranging between 0 and 20 at.%) were prepared by mechanical alloying of elemental metal powders in the presence of 2 wt% NaCl acting as a process control agent. Transition to the body-centered cubic (bcc) phase was achieved for some compositions by a subsequent annealing treatment at 400 °C. The
摘要 通过元素金属粉末的机械合金化制备了面心立方 (fcc) Pd 100−x−y Cu x Ag y 合金(x 范围在 0 到 65 at.% 之间,y 范围在 0 到 20 at.% 之间)在作为过程控制剂的 2 wt% NaCl 存在下。通过随后在 400 °C 下的退火处理,一些组合物实现了向体心立方 (bcc) 相的转变。通过冷压将所得固体固结成粒料,并通过计时电流法在碱性水溶液中评估它们的氢溶解度。对于 fcc 和 bcc 相,氢溶解度随着钯含量的增加而增加。用银代替铜导致 bcc PdCuAg 合金的氢溶解度增加。
Evolution of the microstructure, electrical resistivity and microhardness during atomic ordering of cryogenically deformed Cu-47at.%Pd alloy
annealing at 400 °C for 1 h led to the formation of a uniform ultrafine-grained ordered structure in the cryo-deformed alloy. In turn, the annealing duration of 1 h is not enough to finish the ordering process in the quenched sample. It was found that some volume of the ordered B2-phase was formed in the cryo-deformed Cu-47at.% Pdalloy after holding at room temperature for 0.5 year.
摘要 将低温变形的 Cu-47at.%Pd 合金的 A1→B2 相变动力学与室温变形和高温淬火后的动力学进行了比较。为此,研究了合金在 400 °C 无序→有序转变过程中的微观结构、电学性能和显微硬度的演变。结果表明,在 400 °C 下退火 1 h 导致在低温变形合金中形成均匀的超细晶有序结构。反过来,1 小时的退火时间不足以完成淬火样品的排序过程。发现在室温下保持 0.5 年之后,在低温变形的 Cu-47at.% Pd 合金中形成了一定体积的有序 B2 相。