The method of laser-induced chemical deposition of metal from solution was applied in the continuous in situ laser generation of metal copper catalysts for model organic synthesis reactions. The gas phase products producing during laser-induced copper deposition were analyzed by gas mass spectroscopy whereas solutions used for the copper deposition were investigated before and after laser irradiation using chromato-mass and NMR spectroscopy. It was found out that the catalysis of the studied organic reactions by metal catalysts generated during laser deposition process occurs only upon laser irradiation of the reaction mixture, in turn, the copper structures deposited under laser light exhibit no catalytic activity.Keywords: laser-induced metal deposition, catalysis, copper, gas mass spectroscopy Introduction.One of the most important scientific and engineering tasks is the development of new types of catalysts for selective organic synthesis. Among them are easily renewable and adaptable for flow-through reactors heterogeneous catalysts which provide advantages compared to homogeneous catalysis. It is known that the nanostructured and highly porous materials with a large specific surface area exhibit the highest catalytic activity. Therefore, the development of novel catalytic systems for the organic reactions catalyzed by metal nanosructures is an actual problem of modern chemistry. As a rule, for that purpose the expensive metals such as gold, platinum, palladium, etc are used. On the other hand, the use of cheaper metals such as copper, cobalt, zinc, etc results in fast "contamination" of the catalyst surface by reaction products and the loss of activity. In addition, regeneration of waste catalysts and the synthesis of new is time consuming and quite expensive process.The technique used in this work provides the in situ catalyst generation and in which the problem with activation of the catalyst surface is diminished by constant replacement of the contaminated during the generation process catalyst by new one. In this approach, nano-sized metal particles generated upon laser irradiation are involved in the catalysis process then these particles are deposited forming the pure metal structures suitable for further usage or regeneration. Here, we propose to use of laser induced chemical liquid-phase deposition (LCLD) for the aforementioned purposes. In general, LCLD is a technique dealing with a treatment of a local region of the dielectric substrate or conductor on air or under a layer of liquid solution (plating solution) by a focused laser beam [1][2][3][4][10][11][12]. In turn, laser irradiation of the plating solution leads to the acceleration of metal reduction reaction in the irradiated area as a result of the temperature increase in the local volume of solution within the focus of the laser beam. LCLD can be utilized for deposition of many metals [4][5][6][7][8][9][10] and
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.