Direct Construction of K-Fe3C@C Nanohybrids Utilizing Waste Biomass of Pomelo Peel as High-Performance Fischer–Tropsch Catalysts

Abstract

As the only renewable organic carbon source, abundant biomass has long been established and developed to mass-produce functionalized carbon materials. Herein, an extremely facile and green strategy was executed for the first time to in situ construct K-Fe3C@C nanohybrids directly by one-pot carbonizing the pomelo peel impregnated with Fe(NO3)3 solutions. The pyrolytically self-assembled nanohybrids were successfully applied in Fischer–Tropsch synthesis (FTS) and demonstrated high catalytic performance. Accordingly, the optimized K-Fe3C@C catalysts revealed excellent FTS activity (92.6% CO conversion) with highlighted C5+ hydrocarbon selectivity of 61.3% and light olefin (C2-4=) selectivity of 26.0% (olefin/paraffin (O/P) ratio of 6.2). Characterization results further manifest that the high performance was correlated with the in situ formation of the core-shell nanostructure consisting of Fe3C nanoparticles enwrapped by graphitized carbon shells and the intrinsic potassium promoter originated in pomelo peel during high-temperature carbonization. This work provided a facile approach for the low-cost mass-fabrication of high-performance FTS catalysts directly utilizing waste biomass without any chemical pre-treatment or purification.

Preparation of Fe-based catalysts from waste biomass as a carbon carrier and its catalytic performance in CO2 hydrogenation

“…6B, maximum weight loss occurs at 180 °C and another weight-loss peak appears at 180–400 °C; this peak can be attributed to carbothermal reduction and interfacial reactions, which result in the deoxidation of Fe species and carbonization of the biomass. 43 The main mass loss during carbonization at 700 °C occurs at a higher temperature than that observed during carbonization at 650 °C, indicating the existence of interactions between O-containing functional groups and Fe elements in LC. A slight weight loss is observed at carbonization temperatures above 700 °C, indicating that the weight loss of the catalyst only involves the dehydration of water and carbonization of the biomass.…”

Non-Thermal Plasma Technology for Further Purification of Flue Gas in the Resource Utilization Process of Waste Mercury Catalyst: A Case Study in Xinjiang, China

“…Processes 2024, 12, 691 2 of 13 The mercury in these waste materials has the potential for resource recovery. Mercury (Hg) is persistent, transported long-range and bioconcentrated, and is one of the most toxic heavy metal pollutants in ecosystems [8].…”

“…In recent years, there have been reports of new processes for treating waste mercury catalysts. Qiu et al [12]. and Yu et al [13].…”

“…However, a significant portion of Hg 0 in flue gas is difficult to remove. Conventional flue gas purification technologies are unable to effectively remove Hg 0 [7,[11][12][13]. From an industry-wide perspective, the overall processing technology is outdated and the process routes represented by spray oxidation and activated carbon adsorption make it difficult to achieve stable and standardized emissions.…”