The protection of carboxyl groups by esterification has been the most common method in macroscale and microscale chemistries. The esterification is usually conducted under anhydrous conditions; however, in biological chemistry and related fields, the reaction is of major concern in aqueous environments. Immediate esterification of the carboxyl in aqueous alcoholic media driven by an alkyl chloroformate
In‐Situ Nanostructuring and Stabilization of Polycrystalline Copper by an Organic Salt Additive Promotes Electrocatalytic CO
<sub>2</sub>
Reduction to Ethylene
作者:Arnaud Thevenon、Alonso Rosas‐Hernández、Jonas C. Peters、Theodor Agapie
DOI:10.1002/anie.201907935
日期:2019.11.18
molecular systems with heterogeneous catalysts is a promising approach for the development of new electrodes, combining the advantages of both approaches. In the context of CO2 electroreduction, molecular enhancement of planar copper electrodes has enabled promising advancement towards high Faradaic efficiencies for multicarbon products. Besides, nanostructured copper electrodes have also demonstrated
fabricated and applied to CO2 reduction in an APS cell with modified BiVO4 as the counter electrode. The 3 D structure of the photocathode constructed by Mn:CdS and CdSeTe quantum dots showed a high efficiency for light harvesting and electron transfer in this system to yield methanol at a rate of 90 μm h−1 cm−2 at −0.9 V versus the saturated calomel electrode under 200 mW cm−2 irradiation. Methanol
Photoactivation of Cu Centers in Metal–Organic Frameworks for Selective CO<sub>2</sub> Conversion to Ethanol
作者:Lingzhen Zeng、Zhiye Wang、Yongke Wang、Jing Wang、Ying Guo、Huihui Hu、Xuefeng He、Cheng Wang、Wenbin Lin
DOI:10.1021/jacs.9b11443
日期:2020.1.8
the need of forming one C-C bond while keeping one C-O bond intact. CuI centers were recently shown to selectively catalyze CO2-to-ethanol conversion, but these CuI catalytic sites are unstable under reaction conditions. Here we report the use of low-intensity light to generate CuI species in the cavities of a metal-organic framework (MOF) for catalytic CO2 hydrogenation to ethanol. X-ray photoelectron
催化 CO2 加氢生成乙醇具有重要的实际意义,但由于需要形成一个 CC 键同时保持一个 CO 键完整,因此存在重大挑战。最近显示 CuI 中心选择性催化 CO2 到乙醇的转化,但这些 CuI 催化位点在反应条件下不稳定。在这里,我们报告了使用低强度光在金属有机骨架 (MOF) 的空腔中生成 CuI 物种,用于催化 CO2 氢化成乙醇。X 射线光电子和瞬态吸收光谱副本表明,通过从 MOF 上的光激发 [Ru(bpy)3]2+ 基配体到空腔中的 CuII 中心以及从 CuO 中心到光激发的 [Ru(bpy)3]2+ 基配体。灯光激活后,这种 Cu-Ru-MOF 杂化物在 150 oC、2MPa 的 H2/CO2=3/1 条件下选择性地将 CO2 氢化为 EtOH,活性为 9650 µmol/gCu/h。因此,低强度光会产生并稳定 CuI 物质,以实现持续的 EtOH 生产。
Boosting CO<sub>2</sub> electroreduction to C<sub>2+</sub> products on fluorine-doped copper
作者:Xupeng Yan、Chunjun Chen、Yahui Wu、Yizhen Chen、Jianling Zhang、Rongjuan Feng、Jing Zhang、Buxing Han
DOI:10.1039/d1gc04824d
日期:——
CO2 could be efficiently converted into C2+ products over a fluorine doped Cu catalyst, with high faradaic efficiency (70.4%) and current density (above 400 mA cm−2), which benefited from the boost the adsorption of CO intermediate.
二氧化碳可以在掺氟铜催化剂的作用下高效地转化为C2+产物,其法拉第效率(70.4%)和电流密度(高于400 mA cm-2)均很高,这得益于CO中间体吸附的增强。