Methanol,a crucial C1 intermediate,bridges traditional fossil-based chemical processes with emerging sustainable catalytic technologies by serving as both a versatile hydrogenation product from CO/CO_(2)and an active ...Methanol,a crucial C1 intermediate,bridges traditional fossil-based chemical processes with emerging sustainable catalytic technologies by serving as both a versatile hydrogenation product from CO/CO_(2)and an active intermediate for hydrocarbon synthesis.Despite significant progress in methanol-to-hydrocarbon(MTH)conversion,a comprehensive understanding of reaction mechanisms remains essential to enhance catalyst design and industrial applicability.This review critically synthesizes recent advances in mechanistic insights related to methanol conversion and methanol-mediated catalytic processes.Firstly,we systematically outline key reaction pathways involved in initial carbon–carbon(C–C)bond formation through direct and indirect mechanisms,emphasizing significant breakthroughs from spectroscopic analyses and theoretical calculations.Subsequently,we highlight the autocatalytic characteristics and dual-cycle mechanisms underlying MTH processes,critically evaluating the roles of zeolite structures,pore sizes,topology,and acidity in governing product selectivity and catalyst stability.Additionally,we discuss cutting-edge developments in tandem catalytic systems employing methanol as a pivotal intermediate for CO_(x)hydrogenation,emphasizing the transferable mechanistic principles and catalytic insights.Finally,we identify future research directions,including elucidating precise hydrocarbon pool(HCP)intermediates,optimizing zeolite structures through computational-guided design,and developing robust catalytic systems leveraging advanced characterization methods and artificial intelligence.By integrating multidisciplinary approaches from catalytic science,materials engineering,and reaction engineering,this review provides actionable guidance towards rational design and optimization of advanced catalytic systems for efficient methanol conversion processes.展开更多
The problem of farmers' income growth is the key of issues concerning agriculture,countryside and farmers,so the farmers' income growth is the fundamental starting point for agricultural and rural economic dev...The problem of farmers' income growth is the key of issues concerning agriculture,countryside and farmers,so the farmers' income growth is the fundamental starting point for agricultural and rural economic development. In this paper,we use the statistics concerning farmers' income in Yunnan Province from 1995 to 2012,to perform the path analysis of components of farmers' income in Yunnan Province,study the path of influence of components of farmers' income on farmers' net income,and then set forth the policy recommendations for increasing farmers' income in Yunnan Province.展开更多
Chronic pulmonary heart disease is a common and frequently occurring condition in the respiratory system.Professor Wei Gunzheng advocates a treatment approach that integrates disease management with syndrome different...Chronic pulmonary heart disease is a common and frequently occurring condition in the respiratory system.Professor Wei Gunzheng advocates a treatment approach that integrates disease management with syndrome differentiation,combining methods to eliminate pathogenic factors and reinforce healthy qi.During acute episodes,the focus should be on expelling pathogenic excess while simultaneously consolidating the root and supporting healthy qi.During remission,the priority shifts to reinforcing the body's vital energy.For effective treatment,it is essential to both tonify deficiency and purge excess,ensuring the elimination of pathogenic factors and the restoration of healthy qi.展开更多
A successful extraction process relies heavily on an excellent extractant structure.The theory of extractant structure and extraction performance is still insufficient to guide the design of new extractants,despite ex...A successful extraction process relies heavily on an excellent extractant structure.The theory of extractant structure and extraction performance is still insufficient to guide the design of new extractants,despite extensive research into extractants.However,diglycolamide extractants have demonstrated certain advantages in nuclear fuel reprocessing and rare earth extraction and separation.This paper focuses on the synthesis of 13 structurally serially changed extractants.There is a good connection between the extraction performance and the energy consumption of the carbonyl conformation torsion of the extractant with symmetrical straight-chain alkyl substituents.The extraction capacity of extractant decreases with the increase of alkyl chain length.The methyl substituent extractant shows higher extractability than the other.The steric effect of the alkyl chain with more than two carbons is not significantly different.The relationship between the structure and performance of extractants was systematically studied by the combination of theoretical calculations and experimental data to investigate the effects of symmetric,asymmetric and branched N-substituents on extraction performance.展开更多
基金the Inner Mongolia Natural Science Foundation(2023ZD05,2025JQ028,2025MS02001)the National Natural Science Foundation of China(22278238,22238004)+3 种基金the National Key Research and Development Program of China(2024YFE0211400)the Major Science and Technology Program of Inner Mongolia Autonomous Region(20212120326)the“Elite Talents Revitalize Inner Mongolia”Initiative–Tier-1 Talent Team(202410)the Ordos Science and Technology Breakthrough(JBGS2024003),and Ordos Laboratory for their financial support.
文摘Methanol,a crucial C1 intermediate,bridges traditional fossil-based chemical processes with emerging sustainable catalytic technologies by serving as both a versatile hydrogenation product from CO/CO_(2)and an active intermediate for hydrocarbon synthesis.Despite significant progress in methanol-to-hydrocarbon(MTH)conversion,a comprehensive understanding of reaction mechanisms remains essential to enhance catalyst design and industrial applicability.This review critically synthesizes recent advances in mechanistic insights related to methanol conversion and methanol-mediated catalytic processes.Firstly,we systematically outline key reaction pathways involved in initial carbon–carbon(C–C)bond formation through direct and indirect mechanisms,emphasizing significant breakthroughs from spectroscopic analyses and theoretical calculations.Subsequently,we highlight the autocatalytic characteristics and dual-cycle mechanisms underlying MTH processes,critically evaluating the roles of zeolite structures,pore sizes,topology,and acidity in governing product selectivity and catalyst stability.Additionally,we discuss cutting-edge developments in tandem catalytic systems employing methanol as a pivotal intermediate for CO_(x)hydrogenation,emphasizing the transferable mechanistic principles and catalytic insights.Finally,we identify future research directions,including elucidating precise hydrocarbon pool(HCP)intermediates,optimizing zeolite structures through computational-guided design,and developing robust catalytic systems leveraging advanced characterization methods and artificial intelligence.By integrating multidisciplinary approaches from catalytic science,materials engineering,and reaction engineering,this review provides actionable guidance towards rational design and optimization of advanced catalytic systems for efficient methanol conversion processes.
文摘The problem of farmers' income growth is the key of issues concerning agriculture,countryside and farmers,so the farmers' income growth is the fundamental starting point for agricultural and rural economic development. In this paper,we use the statistics concerning farmers' income in Yunnan Province from 1995 to 2012,to perform the path analysis of components of farmers' income in Yunnan Province,study the path of influence of components of farmers' income on farmers' net income,and then set forth the policy recommendations for increasing farmers' income in Yunnan Province.
文摘Chronic pulmonary heart disease is a common and frequently occurring condition in the respiratory system.Professor Wei Gunzheng advocates a treatment approach that integrates disease management with syndrome differentiation,combining methods to eliminate pathogenic factors and reinforce healthy qi.During acute episodes,the focus should be on expelling pathogenic excess while simultaneously consolidating the root and supporting healthy qi.During remission,the priority shifts to reinforcing the body's vital energy.For effective treatment,it is essential to both tonify deficiency and purge excess,ensuring the elimination of pathogenic factors and the restoration of healthy qi.
基金supported by the Natural Science Foundation of Shandong Province (ZR2022QB067)。
文摘A successful extraction process relies heavily on an excellent extractant structure.The theory of extractant structure and extraction performance is still insufficient to guide the design of new extractants,despite extensive research into extractants.However,diglycolamide extractants have demonstrated certain advantages in nuclear fuel reprocessing and rare earth extraction and separation.This paper focuses on the synthesis of 13 structurally serially changed extractants.There is a good connection between the extraction performance and the energy consumption of the carbonyl conformation torsion of the extractant with symmetrical straight-chain alkyl substituents.The extraction capacity of extractant decreases with the increase of alkyl chain length.The methyl substituent extractant shows higher extractability than the other.The steric effect of the alkyl chain with more than two carbons is not significantly different.The relationship between the structure and performance of extractants was systematically studied by the combination of theoretical calculations and experimental data to investigate the effects of symmetric,asymmetric and branched N-substituents on extraction performance.
