Release Time:2019-03-09  Hits:

Indexed by: Journal Papers

Date of Publication: 2016-01-01

Journal: RSC ADVANCES

Included Journals: EI、SCIE

Volume: 6

Issue: 13

Page Number: 10831-10836

ISSN: 2046-2069

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 (C-5(+)).