Facile one-step synthesis of hierarchical porous carbon monoliths as superior supports of Fe-based catalysts for CO2 hydrogenation. Issue 13 (26th January 2016)

• Record Type: Journal Article
• Authors: Dai, Chengyi; Zhang, Anfeng; Liu, Min; Li, Junjie; Song, Fangyu; Song, Chunshan; Guo, Xinwen
• Is Part Of: RSC advances. Volume 6:Issue 13(2016)
• Page Start: 10831
• Page End: 10836
• Publication Date: 2016-01-26
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra26009d
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A versatile strategy involving one-step desilication of coke-deposited spent zeolite catalyst was successfully developed to prepare hierarchical porous carbon monoliths (HPCMs). Abstract : A versatile strategy involving one-step desilication of coke-deposited spent zeolite catalyst was successfully developed to prepare hierarchical porous carbon monoliths (HPCMs). Such a strategy avoids the use of hard or soft templates and carbon sources, eliminates high temperature carbonization, simultaneously minimizing the emissions from processing spent catalysts. The resulting carbon exhibits a controlled morphology such as three-dimensional networks, hollow spheres or nanosheets, a high degree of graphitization and a multi-level porous structure. Its mesopore (2–50 nm) surface area can reach 522 m 2 g −1 and both mesopore and macropore (50–350 nm) volumes are more than 1.0 cm 3 g −1 . Such hierarchical porous carbon was found to be a superior support for minimizing the nanoparticle size and enhancing the synergism of the Fe–K catalyst for promoting CO2 hydrogenation. Using such a catalyst results in increased conversion of carbon dioxide and enhanced selectivity of high value olefins (C2–4) and long-chain hydrocarbons (C5 + ).