PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Hongcai Su,Yuheng Wu,Jie Pan,Lingjun Zhu,Shurong Wang,Yanjun Hu
Mixed plastic wastes are posing substantial challenges to the environment due to their mass production and difficulty in separation, especially mixed polyvinyl chloride/polyethylene terephthalate (PVC/PET) plastic wastes. In this work, a novel tandem thermochemical process including hydrothermal depolymerization of mixed PVC/PET plastic wastes, and subsequent catalytic aqueous phase reforming (APR) of hydrolysate solution was developed. The activated carbon derived from PVC (PVC-AC) supported Ru catalysts were prepared and successfully used in the catalytic APR of hydrolysate solution for high-purity H 2 production. Besides, the presence of NaOH realized in-situ capture of CO 2 in APR process, which promoted the water-gas shift reaction and inhibited methanation reactions. As a result, a high H 2 yield of 12.23 mol/kg Plastic with H 2 concentration of ca. 98% was obtained via tandem hydrothermal conversion of mixed PVC/PET plastic wastes. The by-products from the entire tandem process including the terephthalic acid (TPA) and sodium chloride (NaCl) were separated and purified for further industrial application. This work provided a sustainable route for conversion of mixed plastic wastes into value-added fuel.
研究领域:
环境科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Yajing Wang,Yane Zheng,Yuhao Wang,Hua Wang,Xing Zhu,Yonggang Wei,Yaming Wang,Lihong Jiang,Zhiyuan Yang,Kongzhai Li
Chemical looping reforming of methane (CLRM) technology is a new approach for syngas and pure hydrogen generation . During the whole reaction, methane is first partially oxidized to syngas by the lattice oxygen of the oxygen carrier, and then the lattice oxygen of the reduced oxygen carrier is recovered by thermal water splitting, with pure hydrogen produced. LaMnO 3 is used as an oxygen carrier for the CLRM. It obtains a high resistance to carbon deposition , while a lower CH 4 conversion due to the unstable structure. Fe ion substitution in LaMnO 3 can be used to improve its reactivity and thermal stability. La 1-x MnFe x O 3 /LaMn 1-x Fe x O 3 (x = 0.05, 0.1, 0.15, 0.2) oxygen carriers own higher reactivity and better resistance to carbon deposition, producing high purity syngas and hydrogen. La 0.85 MnFe 0.15 O 3 sample exhibits the highest CO selectivity (~99%), syngas productivity (3.78 mmol g −1 ) and H 2 productivity (1.76 mmol g −1 ) due to the higher oxygen vacancy concentration, and its H 2 /CO molar ratio is maintained at the ideal ratio of 2.0 (1.93–2.07) during the whole process. Notably, no carbon deposition is generated over LaMnO 3 , La 0.85 MnFe 0.15 O 3 and LaMn 0.9 Fe 0.1 O 3 oxygen carriers even after 20 redox cycles, and La 0.85 MnFe 0.15 O 3 exhibits superior resistance to carbon deposition due to the better structural and thermal stability.
研究领域:
材料科学
·
能源工程
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Meng Huo,Xiaowan Peng,Jin Zhao,Qiuwei Ma,Run Cai,Chun Deng,Bei Liu,Changyu Sun,Guangjin Chen
Using ionic liquids to capture CO to produce high-purity hydrogen (H 2 ) is a promising method. However, there is a lack of theoretical screening for CO capture, which can reduce the number of experiments and costs. In addition, ionic liquids need to reduce their viscosity and maintain an excellent CO capture effect. Therefore, The COSMO-RS was used to screen 300 ionic liquids using CO/H 2 selectivity and viscosity at 293.15 K as indicators. The results showed that the target ionic liquid screened was [EimH][CuCl 2 ]. The addition of ethylene glycol (EG) reduced the viscosity of [EimH][CuCl 2 ] and improved the CO capture ability. After adding 25 wt% EG, its separation factor of CO/H 2 could reach 180 at 293.15 K and 2.1 MPa, which was 59% higher compared to the pure ionic liquid. Furthermore, EG inhibits foaming, and the mixed solvent could maintain high stability after recycling.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2024
·
IF 7.2
Mingkai Liu,Yang Li,Xuyun Wang,Zhongrui Gai,Qiong Rao,Tianlong Yang,Jinrui Zhang,Sanli Tang,Ying Pan,Hongguang Jin
Hydrogen energy, a promising clean source, holds potential to combat global warming. To achieve efficient and low-carbon H 2 production, we proposed an isothermal sorption-enhanced chemical looping reforming (SE-CLR) process to realize the high-purity hydrogen production and in-situ CO 2 capture at mild temperatures (550–650 °C). For practical application, the process is characterized to use Fe-Ni double metal oxide particles as steam methane reforming oxygen carriers, and K 2 CO 3 -promoted Li 4 SiO 4 particles as CO 2 sorbent. The oxygen transfer capacity of metal oxide matintained high at 57.4%, and the K-Li 4 SiO 4 absorbents remained at 22.5% CO 2 absorption capacity over 200 isothermal absorption-regeneration cycles. Conducting a synergistic conversion mechanism within double metal oxides and absorbents, and adjusting the absorbent-to-metal oxide mass ratio to 7:4, enhanced hydrogen purity to 92% and CO 2 uptake to 95%. Furthermore, in-situ CO 2 removal in CLR processes achieved methane conversion and H 2 production rates equivalent to conventional CLR processes under the same reaction conditions, but at temperatures ∼60 °C lower. The effects of the reaction temperature, pressure, steam-to-methane and methane-to-solid ratios on SE-CLR performance were studied systematically. Finally, stable hydrogen production with a purity of 91%–89% and CO 2 uptake of 94%–91% were obtained over 25 CLR cycles, with minimal changes in mechanical strength of particles.
研究领域:
能源科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 6
·2075-2085
·
IF 3.343
Rong Dai,Ziliang Zheng,Chenshuai Lian,Xing Li,Xu Wu,Xia An,Xianmei Xie
Summary A novel Pt-based Beta encapsulated CeO 2 yolk-shell catalyst was successfully synthesized via a RF layer in the synthetic process. The CeO 2 @Pt-Beta catalyst showed high catalytic activity and stability toward the LT-ESR with respect to the reference Pt-Beta, CeO 2 -Pt-Beta, which benefited from the special yolk-shell structure and the synergistic effect between the CeO 2 movable core and Pt metal. The confinement effect of the yolk-shell architecture contributed to the high dispersion of Pt nanoparticles as well as to the accumulation of reactant molecules in the enclosed void space, which ensured the reactants reacted with CeO 2 and Pt to achieve a complete reaction.
研究领域:
化学工程
·
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）