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Catalysis of semihydrogenation of acetylene to ethylene: current trends, challenges, and outlook

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 7,   Pages 1031-1059 doi: 10.1007/s11705-021-2113-3

Abstract: Ethylene is an important feedstock for various industrial processes, particularly in the polymer industry. Unfortunately, during naphtha cracking to produce ethylene, there are instances of acetylene presence in the product stream, which poisons the Ziegler–Natta polymerization catalysts. Thus, appropriate process modification, optimization, and in particular, catalyst design are essential to ensure the production of highly pure ethylene that is suitable as a feedstock in polymerization reactions. Accordingly, carefully selected process parameters and the application of various catalyst systems have been optimized for this purpose. This review provides a holistic view of the recent reports on the selective hydrogenation of acetylene. Previously published reviews were limited to Pd catalysts. However, effective new metal and non-metal catalysts have been explored for selective acetylene hydrogenation. Updates on this recent progress and more comprehensive computational studies that are now available for the reaction are described herein. In addition to the favored Pd catalysts, other catalyst systems including mono, bimetallic, trimetallic, and ionic catalysts are presented. The specific role(s) that each process parameter plays to achieve high acetylene conversion and ethylene selectivity is discussed. Attempts have been made to elucidate the possible catalyst deactivation mechanisms involved in the reaction. Extensive reports suggest that acetylene adsorption occurs through an active single-site mechanism rather than via dual active sites. An increase in the reaction temperature affords high acetylene conversion and ethylene selectivity to obtain reactant streams free of ethylene. Conflicting findings to this trend have reported the presence of ethylene in the feed stream. This review will serve as a useful resource of condensed information for researchers in the field of acetylene-selective hydrogenation.

Keywords: selectivity     hydrogenation     acetylene     ethylene     palladium    

Trends of environmental accidents and impact factors in China

Pengli XUE, Weihua ZENG

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 2,   Pages 266-276 doi: 10.1007/s11783-010-0267-1

Abstract: An overview of the spatial and temporal variations of the environmental accidents in China in recent years was presented in this paper using available data. The results showed that the frequency of pollution accidents was significantly decreased, from 3462 in 1990 to 462 in 2007. The water and air pollution accidents were found to be the dominant types, accounting for more than 80% of the total accidents. Considering the classification of environmental accidents at 4 scales, the general environmental accident, i.e., the least serious type, was the most frequent event, taking up 58.98% of the total pollution accidents. In addition, the distribution of environmental accidents was generally in accordance with the industrial layout in the country during the past decade. It is very important to note that the extraordinarily severe environmental accidents showed an increasing trend in underdeveloped regions, which was caused by the transfer and the development of heavy polluted industry in these areas. As to the losses of environmental accidents, the casualties presented an obvious reduction tendency, while the direct economic loss per accident tended to climb up. Furthermore, some key factors that affect the spatial and temporal tendencies of environmental accidents in China were discussed and some suggestions were put forward, hoping to shed light on environmental risk management and emergency plans making associated with environmental accidents in China.

Keywords: environmental accidents     spatial and temporal trends     environmental risk    

Mapping the trends and prospects of battery cathode materials based on patent landscape

Frontiers in Energy 2023, Volume 17, Issue 6,   Pages 822-832 doi: 10.1007/s11708-023-0900-x

Abstract: Identifying trends and prospects of cathode materials based on patent analysis is considered a kernel

Keywords: patent analysis     cathode     batteries     technology life cycle    

CONCENTRATIONS AND FLUXES OF DISSOLVED NUTRIENTS IN THE YANGTZE RIVER: LONG-TERM TRENDS AND ECOLOGICAL

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4,   Pages 559-567 doi: 10.15302/J-FASE -2020344

Abstract:

Intensifying human activity in the Yangtze River basin has substantially increased nutrient concentrations in the Yangtze River Estuary, leading to degradation of the coastal environment. Analysis of nutrient determinations published over the past 50 years reveals a gradual decreasing trend in the concentrations and fluxes of dissolved silicate (DSi). However, both dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphate (DIP) concentrations have increased significantly since the 1970s. The frequency of and area covered by red tide outbreaks have increased greatly during this period, mainly due to changes in nutrient supply ratios [i.e., N/P (DIN/DIP), N/Si (DIN/DSi), P/Si (DIP/DSi)]. A strong correlation was found between the riverine DIN fluxes and the estimated DIN inputs from the major N sources, particularly fertilizers and atmospheric deposition. The data provide a comprehensive assessment of nutrients in the Yangtze River basin and their ecological impacts and indicate a potentially significant influence of atmospheric deposition on DIN loadings and fluxes.

 

Keywords: atmospheric deposition / ecological impacts / nitrogen sources / nutrients / Yangtze delta    

Emerging trends in self-healable nanomaterials for triboelectric nanogenerators: A comprehensive review

Frontiers in Energy 2023, Volume 17, Issue 6,   Pages 727-750 doi: 10.1007/s11708-023-0896-2

Abstract: A thorough analysis of triboelectric nanogenerators (TENGs) that make use of self-healable nanomaterials is presented in this review. These TENGs have shown promise as independent energy sources that do not require an external power source to function. TENGs are developing into a viable choice for powering numerous applications as low-power electronics technology advances. Despite having less power than conventional energy sources, TENGs do not directly compete with these. TENGs, on the other hand, provide unique opportunities for future self-powered systems and might encourage advancements in energy and sensor technologies. Examining the many approaches used to improve nanogenerators by employing materials with shape memory and self-healable characteristics is the main goal of this review. The findings of this comprehensive review provide valuable information on the advancements and possibilities of TENGs, which opens the way for further research and advancement in this field. The discussion of life cycle evaluations of TENGs provides details on how well they perform in terms of the environment and identifies potential improvement areas. Additionally, the cost-effectiveness, social acceptability, and regulatory implications of self-healing TENGs are examined, as well as their economic and societal ramifications.

Keywords: triboelectric nanogenerator (TENG)     self-healable nanomaterials     self-powered devices     energy    

Research Trends in Information Technology Applications in Construction Safety Engineering and Management

Mirosɬaw J. Skibniewski

Frontiers of Engineering Management 2014, Volume 1, Issue 3,   Pages 246-259 doi: 10.15302/J-FEM-2014034

Abstract: The underlying research topics and their related IT implementations are discussed, and research trends

Keywords: automation     international research journal     research trends     industrial safety engineering and management    

Emergency strategies and trends in the management of liver trauma

Hongchi Jiang, Jizhou Wang

Frontiers of Medicine 2012, Volume 6, Issue 3,   Pages 225-233 doi: 10.1007/s11684-012-0186-6

Abstract: The present review presents emergency strategies and trends in the management of liver trauma.

Keywords: liver trauma     nonoperative management     operative management    

LAND-USE INTENSIFICATION TRENDS IN THE RIO DE LA PLATA REGION OF SOUTH AMERICA: TOWARD SPECIALIZATION

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,

Abstract:

• Current intensification trends in the Rio de la Plata need urgent re-direction.A glance at world regions that have experienced similar trends suggests that an urgent course correction

From risk control to resilience: developments and trends of urban roads designed as surface flood passages

Frontiers of Environmental Science & Engineering 2024, Volume 18, Issue 2, doi: 10.1007/s11783-024-1782-9

Abstract:

● Designing of flood passages toward inundation risk reduction was summarized.

Keywords: Major drainage     Flood mitigation     Resilient city     Stormwater model     Urban flooding    

Forseeing Trends of Development of Analytical Instruments

Jin Qinhan

Strategic Study of CAE 2001, Volume 3, Issue 1,   Pages 85-88

Abstract:

Analytical instruments form an important part of scientific instruments section. Analytical instrument industry belongs to the information industry with high technology. The development of analytical instrument industry is one of the main promotion forces and basis for the development of modern science and technology, economy and society. The innovation in scientific instrumentation is by all means an innovation of science and technology. It should be considered as a strategy of the whole nation to speed up the development of scientific instruments. The main application area of analytical instruments has been moving towards the biomedical fields and analytical instrumentation itself is going towards miniaturization and with more intelligence. However, the precise instrumentation of high quality needed when the human challenges the two extremes of either time or space is definitely not negligible. Life, production, scientific research and social activities all need large quantities of such analytical instruments as on-line, noninvasive, nondestructive, in-situ, in-real-time and multidimensional instruments. The trend of widening the gop between the instrument industry at home and abroad must be taken into serious consideration. One of the main factors which influences the changing of such a situation most would be the change of the old idea on scientific instruments of all ranks including leaders, enterprisers as well as scientists and engineers.

Keywords: analytical instruments     scientific instruments     instrumental innovation     trends    

Age-related trends in genetic parameters for wood properties in

Chao SUN, Meng LAI, Shougong ZHANG, Xiaomei SUN

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 4,   Pages 482-492 doi: 10.15302/J-FASE-2017184

Abstract: We observed that age-related trends in overall means varied for different traits: MFA decreased with

Keywords: early selection     genetic variation     wood properties     SilviScan     Larix kaempferi    

From Green to Sustainability—Trends in the Assessment Methods of Green Buildings

Steve Hsueh-Ming Wang,Paula Williams,Jing Shi,Huojun Yang

Frontiers of Engineering Management 2015, Volume 2, Issue 2,   Pages 114-121 doi: 10.15302/J-FEM-2015018

Abstract: This research investigates recent developments in assessment methods of green buildings and compares the differences in rating systems among the United Kingdom, USA, and Germany. There are indications that the rating systems are moving from green buildings to sustainable buildings. In order to understand the recent research in academic areas, we survey the recent Ph.D. dissertations and literature related to green building assessment. Discussion is provided on the major research areas of green buildings, which cover accountability of life cycle cost, methodology for balancing the three pillars, and government vision and public policy.

Keywords: green     sustainability     buildings     assessment     methods     rating systems    

Research Trends in Fischer--Tropsch Catalysis for Coal to Liquids Technology

Emiel J. M. Hensen,Peng Wang,Wayne Xu

Frontiers of Engineering Management 2016, Volume 3, Issue 4,   Pages 321-330 doi: 10.15302/J-FEM-2016051

Abstract: The authors limit themselves to noting some important trends in the research on Fe-based catalysts.

Keywords: Fischer–Tropsch     FTS     CTL     Fe catalyst     iron carbide     computational modeling    

Scientometric analysis of research trends on solid oxide electrolysis cells for green hydrogen and syngas

Frontiers in Energy doi: 10.1007/s11708-024-0945-5

Abstract: Solid oxide electrolysis cell (SOEC) is a promising water electrolysis technology that produces hydrogen or syngas through water electrolysis or water and carbon dioxide co-electrolysis. Green hydrogen or syngas can be produced by SOEC with renewable energy. Thus, SOEC has attracted continuous attention in recent years for the urgency of developing environmentally friendly energy sources and achieving carbon neutrality. Focusing on 1276 related articles retrieved from the Web of Science (WoS) database, the historical development of SOECs are depicted from 1983 to 2023 in this paper. The co-occurrence networks of the countries, source journals, and author keywords are generated. Moreover, three main clusters showing different content of the SOEC research are identified and analyzed. Furthermore, the scientometric analysis and the content of the high-cited articles of the research of different topics of SOECs: fuel electrode, air electrode, electrolyte, co-electrolysis, proton-conducting SOECs, and the modeling of SOECs are also presented. The results show that co-electrolysis and proton-conducting SOECs are two popular directions in the study of SOECs. This paper provides a straightforward reference for researchers interested in the field of SOEC research, helping them navigate the landscape of this area of study, locate potential partners, secure funding, discover influential scholars, identify leading countries, and access key research publications.

Keywords: solid oxide electrolysis cell (SOEC)     scientometric review     knowledge network     material development     H2O–CO2 co-electrolysis     modeling    

The Birth, Development and Prediction of Future Trends of Highrise and Super-highrise Building

Dai Fudong

Strategic Study of CAE 1999, Volume 1, Issue 2,   Pages 6-18

Abstract:

To realize anything which is manmade in the world is an integration of need and possibility. The birth of highrise and super-highrise building can not disobey the rule. Since remote past, human had the will and need of high things, mounting high and living on high places. But the will and need becoming the reality of high-rise building was only in a special age: (1) From the end of 19th century to the beginning of 20th century, after the industrial revolution, productive forces promoted to a large scale, metropolis enlarged, less land had to hold more people; (2) Steel industry expanded, iron and steel played important roles of building materials; (3) The invention of elevator. These factors emerged simultaneously in the United States. After the birth of highrise building, it went straight ahead to the height of super-highrise, right now, 460 m is a new target to be broken through. The history of the development of highrise and super-highrise building may be devided into four stages: Initial groping, Exploring in depth, Modernism and Maturing Stage. A decade ago, accompanied with the development of economics, there was a booming of highrise and super-highrise building in Asia and West coast of Pacific Ocean. After all, highrise and super-highrise building is a phenomenon of economics. From now on, it should be toward biological. There are broad prospects of engineering works, such as dynamics, mechanics and materials. And there are numerous problems of various aspects to be researched, such as the negative influences of human being* s behaviors in super-highrise buildings. Is there an upper limit of super-highrise building? Where is the limit? ……They are worthy to be explored.

Keywords: highrise and super-highrise building     development     future trends    

Title Author Date Type Operation

Catalysis of semihydrogenation of acetylene to ethylene: current trends, challenges, and outlook

Journal Article

Trends of environmental accidents and impact factors in China

Pengli XUE, Weihua ZENG

Journal Article

Mapping the trends and prospects of battery cathode materials based on patent landscape

Journal Article

CONCENTRATIONS AND FLUXES OF DISSOLVED NUTRIENTS IN THE YANGTZE RIVER: LONG-TERM TRENDS AND ECOLOGICAL

Journal Article

Emerging trends in self-healable nanomaterials for triboelectric nanogenerators: A comprehensive review

Journal Article

Research Trends in Information Technology Applications in Construction Safety Engineering and Management

Mirosɬaw J. Skibniewski

Journal Article

Emergency strategies and trends in the management of liver trauma

Hongchi Jiang, Jizhou Wang

Journal Article

LAND-USE INTENSIFICATION TRENDS IN THE RIO DE LA PLATA REGION OF SOUTH AMERICA: TOWARD SPECIALIZATION

Journal Article

From risk control to resilience: developments and trends of urban roads designed as surface flood passages

Journal Article

Forseeing Trends of Development of Analytical Instruments

Jin Qinhan

Journal Article

Age-related trends in genetic parameters for wood properties in

Chao SUN, Meng LAI, Shougong ZHANG, Xiaomei SUN

Journal Article

From Green to Sustainability—Trends in the Assessment Methods of Green Buildings

Steve Hsueh-Ming Wang,Paula Williams,Jing Shi,Huojun Yang

Journal Article

Research Trends in Fischer--Tropsch Catalysis for Coal to Liquids Technology

Emiel J. M. Hensen,Peng Wang,Wayne Xu

Journal Article

Scientometric analysis of research trends on solid oxide electrolysis cells for green hydrogen and syngas

Journal Article

The Birth, Development and Prediction of Future Trends of Highrise and Super-highrise Building

Dai Fudong

Journal Article