Problem solving supporting characterization

The supported aqueous phase methodology was applied to the system Pd(OAc)2/5 TPPTS, a catalytic precursor for the Trost-Tsuji reaction. The characterization of the solid by 31P MAS NMR confirms the presence of Pd°(TPPTS)3 as the main surface species. The catalytic properties of the solid were tested for the allylic substitution of E-cinnamylethylcarbonate by different nucleophiles such as ethyl acetoacetate, dimethyl malonate, morpholine, phenol, and 2-mercapto-pyridine. The absence of palladium leaching was demonstrated, and having solved the problem of water leaching from the solid to the organic phase, the SAP-Pd catalyst was successfully recycled several times without loss in its activity. It was used in a continuous flow experiment which... 

The objective was the production of enriched uranium-235 from natural uranium by differential diffusion of highly reactive uranium hexafluoride through a porous membrane. A number of surface chemistry problems related to catalysis had to be solved. The work at Princeton was in support of the main effort at the SAM Laboratories of Columbia University. Aside from production of the diffusion barrier, the task was to characterize its pore distribution and stabilize it from corrosion. Taylor was associate director of the SAM Laboratories, spending his days in New York and evenings and weekends at Princeton. Turkevich, in addition to teaching both at Princeton... 

When FRP fabrics or sheets are applied on masonry surfaces, the total lack of transpiration that characterizes composite materials should not be neglected. For this reason, the structural reinforcement carried out with such materials should not concern extended surfaces of the wall face, in order to preserve suitable transpiration of the system. The problem of suitable transpiration of masonry supports can be solved by using steel-reinforced grout (SRG) or fiber-reinforced grout (FRG) materials composed of suitably prepared matrices. 

It is the mandate of scientists to support the sound measurement and use of high quality data to identify, characterize, and solve environmental problems. The chapters in this book provide an overview of the progress made in understanding the fate, transport, impacts, and remediation of chemicals in the environment, and the breadth and extent of these studies. These chapters provide examples of rigorous science supporting the control of chemicals in the environment. 

---