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15 results on '"Li, Dezheng"'

1. Photothermal oxidative dehydrogenation of propane to propylene over Cu/BN catalysts.

Author

Sun, Shaoyuan, Zhao, Manqi, Liu, Huimin, Li, Dezheng, Lei, Yiming, and N. P., Kavitha

Subjects
OXIDATIVE dehydrogenation, PROPENE, SURFACE plasmon resonance, CATALYSTS, PROPANE
Abstract

Oxidative dehydrogenation of propane (ODHP) is a reaction with significant practical significance. As for the industrial application of ODHP, it is challenging to achieve high activity and high propylene selectivity simultaneously. In this study, to overcome this obstacle, we designed a series of Cu/BN catalysts with unique morphologies for establishing a photothermal ODHP system with high efficiency and selectivity. Characterization and evaluation results revealed that Cu/BN-NS and Cu/BN-NF with enlarged specific surface areas exhibited higher catalytic activities. The localized surface plasmon resonance (LSPR) effect of Cu nanoparticles further enhanced the photothermal catalytic performances of Cu/BN catalysts under visible light irradiation. To the best of our knowledge, it is the first time to establish a BNbased photothermal ODHP catalytic system. This study is expected to pave pathways to realize high activity and propylene selectivity for the practical application of ODHP. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Photocatalytic CO 2 Conversion to Ethanol: A Concise Review.

Author

Li, Dezheng, Hao, Chunnan, Liu, Huimin, Zhang, Ruiqi, Li, Yuqiao, Guo, Jiawen, Vilancuo, Clesio Calebe, and Guo, Jiapeng

Subjects
*ETHANOL, *CARBON dioxide, *CLIMATE change mitigation, *GREENHOUSE gases, *CATALYSTS, *RENEWABLE energy sources
Abstract

Photo-catalytically converting the greenhouse gas CO2 into ethanol is an important avenue for the mitigation of climate issues and the utilization of renewable energies. Catalysts play critical roles in the reaction of photocatalytic CO2 conversion to ethanol, and a number of catalysts have been investigated, including semiconductors and plasmonic metal-based catalysts, as well as several other catalysts. In this review, the progress in the development of each category of catalysts is summarized, the current status is reviewed, the remaining challenges are pointed out, and the future research directions are prospected, with the aim being to pave pathways for the rational design of better catalysts. [ABSTRACT FROM AUTHOR]

Published
2022
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14. In situgenerated oxygen vacancy on Nb2O5for boosted catalytic activities of M/Nb2O5in photothermal CO2reforming of CH4

Author

Li, Yuqiao, Guo, Jiawen, Liu, Huimin, Liu, Aidi, and Li, Dezheng

Abstract

Photothermal synergistic CO2reforming of CH4(CRM) is a promising avenue to convert the greenhouse gases (CO2and CH4) into valuable chemicals and store the abundant clean solar energy into chemical energy simultaneously. Developing photothermal catalysts that could drive CRM efficiently at low temperatures remains as a challenge. In the present study, Nb2O5supported group VIII metal catalysts (M/Nb2O5) were synthesized, with the typical catalyst Rh/Nb2O5recording a CO2conversion rate of 50.6 mmol gRh−1min−1in CRM at 500 °C under visible light irradiation, about double fold higher than that achieved under the thermal-driven reaction condition. Mechanism study disclosed that oxygen vacancy was generated in situ over M/Nb2O5under the CRM reaction atmosphere. The oxygen vacancy promoted CO2adsorption and enhanced the light harvesting capacities of M/Nb2O5catalysts, which ultimately boosted their activities in photothermal CRM. This study provides a promising pathway for the rational design of efficient catalysts by tailoring the properties of the catalysts under the reaction atmosphere.

Published
2023
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15. Enhancing the Resilience of Low Earth Orbit Remote Sensing Satellite Networks

Author

Shuangwu Chen, Xiaofeng Jiang, Li Dezheng, Jian Yang, and Lajos Hanzo

Subjects
Network architecture, Computer Networks and Communications, business.industry, Computer science, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, 02 engineering and technology, Network topology, Transmission (telecommunications), Handover, Hardware and Architecture, 0202 electrical engineering, electronic engineering, information engineering, Satellite, The Internet, business, Resilience (network), Software, Information Systems, Data transmission, Computer network
Abstract

The Low Earth orbit Remote Sensing (LRS) satellite network is envisioned as an essential component of bolstering space information applications, thus extending conventional ground information applications to the on-board space information applications. However, it inevitably faces grave challenges imposed by the dynamics of the satellite network's topology, by the intermittence of Inter-Satellite communication Links (ISLs) as well as by the mobility-induced satellite-access switching of mobile terminals. Hence, this is a very different networking landscape from that of the terrestrial Internet. Against these challenging problems, we propose a resilient networking architecture for LRS Satellite Networks (LRS-SNs), with special emphasis on their dynamic routing, resilient transmission and their intrinsic mobility. Specifically, path-quality aided and lifetime-aware dynamic routing is proposed for enhancing the routing against dynamic topology changes. Hop-by-hop data transmission is relied upon for providing transmission resilience against ISL intermittence. Furthermore, data caching is invoked for providing resilience against intermittent communications imposed by dynamic satellite access switching. We employ a semi-physical simulation platform for evaluating the achievable performance of the proposed resilient network architecture.

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