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Research progress of catalysts for direct coal liquefaction

Journal of Energy Chemistry 2025年第1期100卷 481-497页

作者： Wei Song Penggao liu Xinyue Chen Ting Wang Chunrong He Rui Hao Kaiyu liu State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources College of Chemistry Xinjiang University College of Chemistry and Chemical Engineering Henan Polytechnic University Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical Engineering Central South University

Coal direct liquefaction technology is a crucial contemporary coal chemical technology for efficient and clean use of coal resources. The development of direct coal liquefaction technology and the promotion of alternative energy sources are important measures to guarantee energy security and economic security. However, several challenges need to be addressed, including low conversion rate, inadequate oil yield, significant coking, demanding reaction conditions, and high energy consumption. Extensive research has been conducted on these issues, but further exploration is required in certain aspects such as pyrolysis of macromolecules during the liquefaction process, hydrogen activation, catalysts' performance and stability, solvent hydrogenation, as well as interactions between free radicals to understand their mechanisms better. This paper presents a comprehensive analysis of the design strategy for efficient catalysts in coal liquefaction, encompassing the mechanism of coal liquefaction, catalyst construction,and enhancement of catalytic conversion efficiency. It serves as a comprehensive guide for further research endeavors. Firstly, it systematically summarizes the conversion mechanism of direct coal liquefaction, provides detailed descriptions of various catalyst design strategies, and especially outlines the catalytic mechanism. Furthermore, it addresses the challenges and prospects associated with constructing efficient catalysts for direct coal liquefaction based on an understanding of their action mechanisms.

关键词： Direct coal liquefaction Catalysts Mechanism of action Solvent hydrogenation

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露点送风方案的两种特殊空气处理过程分析

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湖南科技大学学报（自然科学版） 2004年第2期19卷 46-48页

作者：刘何清陈世强成剑林刘传聚湖南科技大学能源与安全学院湖南湘潭411201 同济大学热能工程系上海200092

针对舒适性空调设计采用露点送风的方案,对房间计算送风量不满足房间换气次数要求和房间热湿比线与90%相对湿度线无交点的2种情况,进行了空气处理过程的分析;提出了这2种情况可能的空气处理过程,并分析了各种空气处理过程房间温、湿度... 详细信息

针对舒适性空调设计采用露点送风的方案,对房间计算送风量不满足房间换气次数要求和房间热湿比线与90%相对湿度线无交点的2种情况,进行了空气处理过程的分析;提出了这2种情况可能的空气处理过程,并分析了各种空气处理过程房间温、湿度参数的变化及可能的室内空气终状态,指出了各种空气处理过程,在保证房间对温度的要求的情况下,影响房间湿度的主要因素.图5,参7.

关键词：露点送风空气处理回风空调系统换气次数热湿比建筑物

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Miyaoka-type inequalities for terminal threefolds with nef anti-canonical divisors

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Science China Mathematics 2025年第1期68卷 1-18页

作者： Masataka Iwai Chen jiang Haidong liu Department of Mathematics Graduate School of ScienceOsaka University Shanghai Center for Mathematical Sciences & School of Mathematical Sciences Fudan University Department of mathematics Sun Yat-sen University

In this paper,we study Miyaoka-type inequalities on Chern classes of terminal projective 3-folds with nef anti-canonical *** X be a terminal projective 3-fold such that-KXis *** show that if c1（X） · c2（X）≠0,then c1（X） · c2（X） ≥ 1/252;if further X is not rationally connected,then c1（X） · c2（X） ≥ 4/5 and this inequality is *** order to prove this,we give a partial classification of such varieties along with many *** also study the nonvanishing of c1（X）dim X-2· c2（X） for terminal weak Fano varieties and prove a Miyaoka-Kawamata-type inequality.

关键词： terminal threefolds Miyaoka-type inequality boundedness

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Multiphysics simulation and optimization of the in-situ beneficiation process of ilmenite minerals from lunar regolith

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Science China Earth Sciences 2025年第1期68卷 195-207页

作者： Peng ZHANG Xin liu Guanghui liu Wei DAI Hanzhe YANG Haibo ZHENG Zhi WANG Ran NIU Yifan BAI Yang ZHANG Chengbao liu Ge YANG Junwei YANG Guang ZHANG Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing Hegong Simulation Co. Ltd

The exploration and utilization of lunar resources have become the major objectives of future lunar exploration missions. The classified collection and processing of lunar minerals is the basic prerequisite for the in-situ exploration and utilization of lunar resources. In this study, we propose a scheme for in-situ separation of magnetic minerals from lunar soils using the dry magnetic separation method. The scheme can realize the purpose of separating magnetic minerals from lunar regolith by altering the motion trajectory of lunar regolith particles with different magnetic properties. Detailed modeling of the dry magnetic separation device is conducted, and the three-dimensional distribution of magnetic parameters is calculated and analyzed. Based on the characterization and analysis of the Chang E-5's samples, the morphologies and physical parameters of lunar regolith particles are modeled and simulated. A discrete element simulation of the motion process of lunar regolith particles under multi-physical field conditions is performed, and the influences of key parameters on the beneficiation performance of lunar magnetic minerals are investigated. Our results indicate that optimal separation and beneficiation of lunar regolith particles can be achieved under specific conditions of magnetic field strength and drum speed. Additionally, we analyze the effects of lunar weak gravity conditions and the charged nature of lunar particles on the beneficiation process, showing that these factors can obviously enhance the beneficiation process of lunar ilmenites. This study demonstrates the feasibility of using the dry magnetic separation method for the beneficiation of magnetic minerals from lunar regolith, providing a theoretical basis for the scientific tasks of collecting, processing, and utilizing lunar mineral resources.

关键词： Lunar regolith In-situ resource utilization Magnetic separation Classified sampling

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Carbothermal reduction characteristics of oxidized Mn ore through conventional heating and microwave heating

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 221-230页

作者： Yang He jian liu jian-hua liu Chun-lin Chen Chang-lin Zhuang Institute of Engineering Technology University of Science and Technology BeijingBeijing 100083China Commonwealth Scientific and Industrial Research Organisation Melbourne 3168Australia Dongbei Special Steel Group Co. Ltd.Dalian 116105China College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China

For the purpose of exploring a potential process to produce FeMn,the effects of microwave heating on the carbothermal reduction characteristics of oxidized Mn ore was *** microwave heating curve of the mixture of oxidized Mn ore and coke was analyzed in association with the characterization of dielectric *** comparative experiments were conducted on the carbothermal reductions through conventional and microwave heatings at temperatures ranging from 973 to 1373 *** thermogravimetric analysis showed that carbothermal reactions under microwave heating proceeded to a greater extent and at a faster pace compared with those under conventional *** metal phases were observed in the microstructures only under microwave *** carbothermal reduction process under microwave heating was *** electric and magnetic susceptibility differences were introduced into the thermodynamics analysis for the formation of metal *** developed thermodynamics considered that microwave heating could make the reduction of MnO to Mn more accessible and increase the reduction extent.

关键词： carbothermal reduction manganese ore manganese oxides microwave heating thermodynamics electromagnetic fields

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Weak feedback self-mixing interference fringe slope discrimination method based on deep learning

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Optoelectronics Letters 2025年

作者： ZHAO Yan lin Maohua DU Shengzhi TONG Jigang liu Bin HAN Fangfang School of Electrical Engineering and Automation， Tianjin University of Technology Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems Department of Electrical Engineering， Tshwane University of Technology

In order to identify the tilt direction of the self-mixing interference (SMI) signals under weak feedback regime interfered by noise， a deep learning method is proposed. The one-dimensional U-Net (1D U-Net) neural network can discriminate the direction of self-mixing fringes accurately and quickly. For experimental SMI signals， the 1D U-Net can be used for discriminant direction after a one-step normalization. Simulation and experimental results show that the proposed method is suitable for SMI signals with noise within the whole weak feedback regime， and can maintain a high discrimination accuracy for signals interfered by 5dB noise. Combined with fringe counting method， accurate and rapid SMI signal displacement reconstruction can be realized.

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Applications of in-situ solid-state nuclear magnetic resonance in methanol to olefins reaction

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Science China Chemistry 2025年第1期68卷 134-151页

作者： Jing Niu Shutao Xu Yingxu Wei Zhongmin liu National Engineering Research Center of Lower-Carbon Catalysis Technology Dalian Institute of Chemical PhysicsChinese Academy of Sciences State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The methanol-to-olefins（MTO） reaction offers an alternative pathway for the production of low-carbon olefins from non-oil feedstocks. Fundamental research has been impeded by a lack of comprehensive understanding of its underlying mechanism,despite the significant progress made in industry. In-situ solid-state nuclear magnetic resonance（ss NMR） spectroscopy has emerged as a pivotal tool, offering crucial insights into key species under real-time operando conditions. Furthermore, the host–guest interaction between zeolites or surface species residing on zeolites and the reactant/active intermediates is revealed by the combination of in-situ13C MAS NMR and 2D correlation spectroscopy. Moreover, recent technological advancements in hyperpolarization（HP） methods, including HP129Xe NMR and dynamic nuclear polarization（DNP）, have significantly improved the sensitivity of ss NMR, enabling detailed structural and kinetic analysis as well as the detection of trace species. In this feature article, we summarized recent advancements in（in-situ） ss NMR spectroscopy applied to MTO reaction processes,encompassing mechanistic investigations at various stages and the intricate host–guest interactions. These theoretical insights into the dynamic evolution of MTO reactions lay a solid foundation for the optimization of catalytic processes and the development of efficient catalysts, thereby advancing the techniques towards more sustainable and economical production route for olefins.

关键词： MTO zeolites in-situ ssNMR reactive intermediates reaction mechanism

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家庭督导员疾病管理水平对肺结核患者治疗依从性、生存质量及自护能力的影响

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齐鲁护理杂志 2017年第5期23卷 18-19页

作者：文厚明简麟刘双群荆州市传染病(胸科)医院湖北荆州434100

目的:探讨家庭督导员疾病管理水平对肺结核患者治疗依从性、自护能力、生存质量的影响。方法:115例肺结核患者均由家庭督导员督导抗结核治疗,根据疾病管理水平分为高水平组37例、中水平组40例及低水平组38例,比较各疾病管理水平组对肺... 详细信息

目的:探讨家庭督导员疾病管理水平对肺结核患者治疗依从性、自护能力、生存质量的影响。方法:115例肺结核患者均由家庭督导员督导抗结核治疗,根据疾病管理水平分为高水平组37例、中水平组40例及低水平组38例,比较各疾病管理水平组对肺结核患者治疗依从性、各项生存质量及自护能力的影响。结果:随着家庭督导员疾病管理水平的逐渐提高,肺结核患者治疗依从性、生存质量评分及自护能力均呈明显升高的趋势(P<0.05)。结论:加强家庭督导员疾病管理水平可明显改善肺结核患者的治疗依从性、自护能力及生存质量。

关键词：肺结核家庭督导员疾病管理水平自护能力

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风化煤中黄腐酸的提取及其表征研究进展

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广州化工 2017年第15期45卷 1-2,8页

作者：周剑林刘伟银张欣湖南科技大学煤炭清洁利用与矿山环境保护湖南省重点实验室湖南湘潭411201 湖南科技大学化学化工学院湖南湘潭411201

黄腐酸类物质在工业、农业、林业和医药等领域有广泛的应用,风化煤中存在丰富的黄腐酸,从风化煤中提取黄腐酸是风化煤非燃料利用,提高其附加值的重要途径。现有的黄腐酸提取工艺过程中,技术难度大,产量少,因此黄腐酸的研究受到国内外学... 详细信息

黄腐酸类物质在工业、农业、林业和医药等领域有广泛的应用,风化煤中存在丰富的黄腐酸,从风化煤中提取黄腐酸是风化煤非燃料利用,提高其附加值的重要途径。现有的黄腐酸提取工艺过程中,技术难度大,产量少,因此黄腐酸的研究受到国内外学者的关注。本文主要介绍了黄腐酸的提取和表征方法,对各种提取方法优缺点进行了评价,对黄腐酸的表征方法进行了分析。

关键词：黄腐酸提取方法表征风化煤

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对加快四川民族医药人才培养的思考

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西南民族大学学报（自然科学版） 2016年第5期42卷 473-478页

作者：李佳川顾健许世林刘鹏西南民族大学药学院四川成都610041

目的对四川民族医药人才培养现状和问题进行分析,为民族医药人才培养体系的建立提供科学的对策和建议.方法通过民族地区实地走访、高校调研以及相关文献资料查询,多途径整理四川民族医药人才培养的现状,并提出相关思考.结果近些年来,四... 详细信息

目的对四川民族医药人才培养现状和问题进行分析,为民族医药人才培养体系的建立提供科学的对策和建议.方法通过民族地区实地走访、高校调研以及相关文献资料查询,多途径整理四川民族医药人才培养的现状,并提出相关思考.结果近些年来,四川民族地区医药卫生人才培养取得了较好的新成绩,但民族地区医疗卫生人才数量不足、分布不均、结构不合理等问题仍是制约民族医药发展的重要瓶颈.结论优化建立多形式、多层次的民族医药人才培养体系,对加快四川民族地区医药人才培养,提升四川医疗卫生水平,促进四川民族地区跨越式发展具有重大意义.

关键词：四川民族地区民族医药人才培养

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