文献类型：期刊文献

英文题名：Ferric Sludge Derived Hydrochar Supported Iron Catalysts for Catalytic Cracking of Toluene

作者：Xiao, Yao[1,2]; Ding, Lu[1,2,3]; Leghari, Asma[1,2]; Hungwe, Douglas[4]; Gao, Ming[1,2]; Gao, Yunfei[1,2]; Zhang, Yayun[5]; Chen, Xueli[1,2]; Wang, Fuchen[1,2]

机构：[1] Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai, 200237, China; [2] Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality, Ministry of Education, Shanghai, 200237, China; [3] Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China; [4] Research and Development Center, Hosei University, Tama Campus, 4342 Aihara, Machida, Tokyo, 194-0298, Japan; [5] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240039478)

语种：英文

外文关键词：Adsorption - Carbon - Carbonization - Catalyst activity - Deposits - Hematite - Iron - Magnetite - Molar ratio

摘要：Hydrochar properties can be tailored from ubiquitous bio-resources to a low-cost, porous, and oxygenated-functional-group-rich catalyst carrier. In this study, Fe-loaded hydrochar catalysts were prepared using a one-pot hydrothermal carbonization (HTC) method, employing ferric sludge as the precursor. Subsequently, the catalytic cracking performance on toluene was investigated. The HTC-furnished catalysts exhibited more dispersed active sites. XRD and XAS results suggested that Fe mainly exists in the form of Fe0, Fe2O3, and Fe3O4. All catalysts showed high toluene removal performance (> 60%) and produced H2-rich syngas (the molar ratio of H2 > 90%). In particular, the catalyst prepared by the HNO3-assisted HTC (HNC) presented the highest toluene removal efficiency and H2 yield, 77.52% and 11.12 mol%, respectively. The characterization of the spent catalysts suggested that the decrease in the specific surface area is caused by carbon deposits but the active phase of Fe remained largely unchanged. DFT was used to calculate the adsorption of carbonaceous species by different Fe active phases to determine the type of carbon deposits. The results indicated that the adsorption energy of C generated from methyl on different Fe phases was lowest (the adsorption energy of C was -8.79 eV for Fe. -5.28 eV for Fe2O3, and -4.70 eV for Fe3O4), suggesting that the adsorption of C on the catalyst was the main reason for the formation of carbon deposits. The lowest adsorption energy of the metallic Fe phase for C indicated that Fe0 was coated by carbon deposits during toluene catalytic cracking, which hampered catalytic activity. These results are of great significance for optimizing the preparation of Fe-loaded carbonaceous catalysts and the regulation of Fe active phase. ? 2024, The Authors. All rights reserved.