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Advanced materials: high loading Fe monoatomic catalyst for gram scale synthesis and its high efficiency for styrene epoxidation

wallpapers News 2020-12-05
Since the concept of

was discovered it has been closely related to the progress of human society. For example: the discovery of synthetic ammonia catalysis the production of various explosives for the national defense industry the agricultural production of synthetic fertilizers various organic industrial intermediates sulfonamides in the pharmaceutical industry etc.; the proposal of PD Pt Rh three-way catalyst which plays an important role in the purification of automobile exhaust etc. Therefore the development of new catalysts is the need of modern chemical industry the progress of human society. As a new catalyst developed in recent years monatomic catalyst emerges as the times require. In the monoatomic catalyst metal monoatom sites are dispersed on the support at atomic level which makes the monoatomic catalyst have high atom utilization efficiency. In recent years scientists have developed many methods for the synthesis of monatomic catalysts such as impregnation host guest strategy photochemical reduction atomic layer deposition etc. However these synthetic methods are still just the tip of the iceberg for the synthesis of monatomic catalysts. There are still many challenges to be overcome in finding monatomic catalysts that meet the actual needs of chemical production: 1) because the monatomic sites are easy to move agglomerate the synthesis of monatomic catalysts often requires fine operation complex steps; 2) different metal atoms It is difficult to develop a suitable synthesis strategy for almost all transition metal monatomic catalysts due to the great difference of coordination performance between the two catalysts; 3) the monoatom catalysts synthesized by the existing methods always have low loading less synthesis which has become a bottleneck restricting the application of the monoatom catalysts in practical production. Therefore it is very important to develop a synthesis strategy to synthesize a series of high loading monoatomic catalysts in large doses.

Wang Dingsheng associate professor of Chemistry Department of Tsinghua University his collaborators have developed a method of calcining coordination polymer to synthesize high loading monatomic Fe catalyst supported on carbon nitride (SAS FE) in gram scale. It is found that SAS Fe has a higher defect content than ordinary graphite carbon nitride. Through EXAFS curve simulation it is found that the coordination number of Fe in SAS Fe is lower. These three factors are also the reasons why SAS Fe has a high metal load. This strategy can be used not only to synthesize SAS Fe but also to synthesize more transition metal monoatomic catalysts. These monoatomic catalysts can be scaled up to gram scale contain very high metal loading such as SAS Ni (21.57 wt%) SAS Cu (22.36 wt%) SAS Zn (21.09 wt%) SAS Ru (13.47 wt%) SAS Rh (3.5 wt%) SAS PD (3.8 wt%) SAS Pt (3.2 wt.) SAS IR (4.4 wt.%). The researchers of

also tested the catalytic performance of SAS Fe found that SAS Fe had high activity stability for styrene epoxidation. The results show that SAS Fe can achieve 64% yield 89% selectivity in 3 hours with only atmospheric oxygen as oxidant the catalytic effect is almost unchanged after five cycles.

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