Photo-thermal coupling to enhance CO2 hydrogenation toward CH4 over Ru/MnO/Mn3O4

Abstract

Upcycling of CO2 into fuels by virtually unlimited solar energy provides an ultimate solution for addressing the substantial challenges of energy crisis and climate change. In this work, we report an efficient nanostructured Ru/MnOx catalyst composed of well-defined Ru/MnO/Mn3O4 for photo-thermal catalytic CO2 hydrogenation to CH4, which is the result of a combination of external heating and irradiation. Remarkably, under relatively mild conditions of 200 °C, a considerable CH4 production rate of 166.7 mmol g−1 h−1 was achieved with a superior selectivity of 99.5% at CO2 conversion of 66.8%. The correlative spectroscopic and theoretical investigations suggest that the yield of CH4 is enhanced by coordinating photon energy with thermal energy to reduce the activation energy of reaction and promote formation of key intermediate COOH* species over the catalyst. This work opens up a new strategy for CO2 hydrogenation toward CH4.

Hierarchical Carbon Nanocages as Superior Supports for Photothermal CO2 Catalysis

“…The Ru catalyst loaded on the as-obtained hCNC, denoted as Ru/hCNC, was first prepared by the impregnation method. Ru was chosen in this study since it has been well-known as an excellent metal catalyst in various catalytic processes, e.g., CO 2 hydrogenation, − ammonia synthesis, − and so forth. TEM images and energy-dispersive X-ray spectroscopy (EDS) elemental mapping of a typical sample with a relatively high metal loading of 12 wt % illustrate the successful loading of Ru nanoparticles (Figure a–c).…”

Ruthenium–Cobalt Solid-Solution Alloy Nanoparticles for Enhanced Photopromoted Thermocatalytic CO2 Hydrogenation to Methane

“…For this purpose, a diverse range of materials have been investigated as potential catalysts for photopromoted CO 2 hydrogenation, including noble metals (e.g., Ir, Ru, Pt, and Pd) − or nonprecious metals (e.g., Cu, Co, and Ni) ,, deposited on various supports. Among these catalysts, Ru-based nanomaterials have garnered extensive recognition as the most promising catalysts for catalytic CO 2 methanation; however, the limited availability and cost-prohibitive nature of Ru pose significant constraints on their practical industrial applications. , In this context, the incorporation of a nonprecious transition metal into Ru-forming alloys to mitigate Ru consumption represents an appealing strategy. Considering its high abundance and low-cost, Co emerges as a promising candidate for substituting noble metal elements.…”

Bryophyte-Bioinspired Nanoporous AAO/C/MgO Composite for Enhanced CO2 Capture: The Role of MgO

“…Fujishima et al introduced a method involving hydrogen extraction through water electrolysis using electricity from high-efficiency solar cells [2] (methodology currently used and highly studied [3]), followed by combining this hydrogen with CO 2 emitted by power plants and factories to produce methanol, a potential energy source [4]. This process transforms carbon-containing gases like CO 2 from greenhouse contributors into valuable resources, substituting oil and natural gas [5]. This concept harnesses the principles of artificial photosynthesis, which involves a nanostructured device designed to capture solar energy and convert CO 2 emissions into fuel.…”