Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Advances in hydrogen production by aqueous phase reforming of biomass oxygenated derivatives
No full textHydrogen is an environmental-friendly and renewable energy source and an important form of energy storage. The development and utilization of hydrogen energy can not only solve two major problems of energy scarcity and environmental pollution caused by the massive use of fossil fuels, but also help to optimize the energy structure from non-renewable source to clean and renewable source of energy. Among those hydrogen production technologies, aqueous phase reforming of biomass derivatives is an attractive way for the effective generation of hydrogen and fine utilization of biomass, which is a high-value and less polluted resource. Aqueous phase reforming of biomass derivatives with wide range of sources and high hydrogen content enjoy high yield of hydrogen and relatively mild reaction conditions. In this paper, a detailed summary of hydrogen production by aqueous phase reforming of different sources is provided. The research progress in hydrogen production by aqueous phase reforming of biomass derivatives in recent years is reviewed and discussed, and the catalytic reaction mechanisms and the effect of catalyst properties are summarized and presented. The current challenges and future developments in this research area are briefly prospected as well
Optimizing zeolitic hierarchical pore structure to boost the direct conversion of aromatics from syngas over the iron-based/zeolite bifunctional catalysts
No full textThe utilization of iron-based/ZSM-5 bifunctional catalysts for converting syngas to aromatics (STA) has garnered significant interest because of its cost-effectiveness. This study aims to elucidate the regulatory mechanism of zeolitic pore structure on the performance of the bifunctional catalyst in STA reaction. The relationship among the mesoporosity and mesoporous diameter of hierarchical ZSM-5 zeolite component, product distribution, and catalyst stability is investigated through a range of analyses techniques, including XRD, SEM, TG, Raman, N2adsorption and desorption. The results demonstrate that as the mesoporosity of zeolite increased to 78.9%, the lifetime of the iron-based/ZSM-5 bifunctional catalyst extended beyond 96 h and maintained the aromatics selectivity over 40% at 2 MPa, 320 degrees C, and 3000 h-1. This outcome can be attributed to the role of high mesoporosity in restraining coke formation in zeolites. Moreover, the reduction in mesopore size from 11.1 to 5.8 nm results in an increased aromatics selectivity from 39.6% to 43.4%, and the fraction of light aromatics rose from 48.8% to 54.5%, indicating that small mesopore size can also expedite the production of aromatics, particularly light aromatics. It is thus concluded that the improvement of aromatics selectivity and stability of iron-based/ ZSM-5 bifunctional catalysts in STA reaction can be achieved by increasing the mesoporosity and decreasing the mesopore size of the zeolite component
Science and Technology Apparatus Development Program of the Chinese Academy of Sciences[GDME-2022D043]
No full textHighly conductive freestanding sulfur cathode based on low-defect graphene-PEDOT:PSS aerogel for Li-S batteries
No full textHighly conductive freestanding cathode, featuring with a unique aerogel configuration with sulfur deposited on low-defect graphene and subsequent encapsulation in poly(3,4-ethylene-dioxythiophene):poly(styrenesulfonate), is designed and synthesized for lithium-sulfur batteries. The freestanding cathode exhibits an ultrahigh conductivity for fast ions/electrons transportation and realizes effective immobilization of polysulfides, thereby enhancing lithium storage performance. This research provides a potential for use in high-performance flexible lithium-sulfur batteries
Increasing cerium dispersion favours lattice oxygen activity of cobalt oxides for CO catalytic combustion
No full textRemoving carbon monoxide with catalytic combustion technology is an effective and economical solution. Highly efficient conversion of CO at low temperatures can be achieved by introducing a catalyst, and its application in automotive exhaust emissions and preferential oxidation of CO in fuel cells is remarkable. In this work, catalysts were prepared by mixing the prepared cerium organic framework with Co3O4, and after calcination at 400 degrees C, the organic framework collapsed, resulting in a uniform dispersion of Ce on the Co3O4 nano surface. Experimental results demonstrated that the required temperature of the catalyst is 101 degrees C when the conversion is 90 %, and it remained stable over the 75 h tested at 100 degrees C. High resolution transmission electron microscopy (HRTEM) revealed that Ce/Co3O4 primarily exposed 311 surface. Combined with DFT calculations, the catalysts may improve the catalytic combustion activity of CO by multiplying the oxygen vacancies and modulating the dispersion of Ce atoms. The reaction occurred on the 311 surface predominantly. Activated CO* preferred to react with the lattice oxygen at the Ce-O-Co linkage compared to the lattice oxygen at Co-O-Co. Energy barrier for the rate dictating step in the complete catalytic cycle is 0.42 eV. This work not only provides experimental support and theoretical basis for the design of low-temperature catalytic combustion CO catalysts, but also provides new ideas for the doping of metal oxides with lanthanide metals
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