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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

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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

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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

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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

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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

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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

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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

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Forseeing Trends of Development of Analytical Instruments

Jin Qinhan

Strategic Study of Chinese Academy of Engineering 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

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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

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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

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

Dai Fudong

Strategic Study of Chinese Academy of Engineering 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

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

Yandan FU, Jiahui KANG, Ziyue LI, Xuejun LIU, Wen XU

Frontiers of Agricultural Science and Engineering Pages 559-567 doi: 10.15302/J-FASE-2020344

Abstract: Intensifying human activity in the Yangtze River Basin (YRB) 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 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 YRB 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 River Delta

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On the Trends of Autonomous Unmanned Systems Research

Ben M. Chen

Engineering 2022, Volume 12, Issue 5, Pages 20-23 doi: 10.1016/j.eng.2021.10.014

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A Further Discussion on Trends in the Development of Advanced Manufacturing Technology

YANG Shu-zi, WU Bo, LI Bin

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 1, Pages 1-5 doi: 10.1007/s11465-005-0002-y

Abstract:

This paper is a supplement to Trends in the Development of Advanced Manufacturing Technology (YangThen, a detailed analysis is given on the features and trends in the development of advanced manufacturing

Keywords： Development development integration networking orientation

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Trends of foodborne diseases in China: lessons from laboratory-based surveillance since 2011

Jikai Liu, Li Bai, Weiwei Li, Haihong Han, Ping Fu, Xiaochen Ma, Zhenwang Bi, Xiaorong Yang, Xiuli Zhang, Shiqi Zhen, Xiaoling Deng, Xiumei Liu, Yunchang Guo

Frontiers of Medicine 2018, Volume 12, Issue 1, Pages 48-57 doi: 10.1007/s11684-017-0608-6

Abstract:

Foodborne disease is one of the most important public health issues worldwide. China faces various and unprecedented challenges in all aspects of the food chain. Data from laboratory-based foodborne disease surveillance systems from 2013 to 2016, as well as different regions and ages, can be found along with differences in the patterns of pathogens detected with diverse characteristics. has been the leading cause of infectious diarrhea in China, especially among adults in coastal regions. has been a serious and widely distributed pathogen responsible for substantial socioeconomic burden. was mostly identified in Northwest China and the inland province (Henan) with less-developed regions among children under 5 years. Data from foodborne disease outbreak reporting system from 2011 to 2016 showed that poisonous animals and plant factors responsible for most deaths were poisonous mushrooms (54.7%) in remote districts in southwest regions. The biological hazard that caused most cases reported (42.3%) was attributed to the leading cause of foodborne outbreaks. In this review, we summarize the recent monitoring approach to foodborne diseases in China and compare the results with those in developed countries.

Keywords： foodborne diseases surveillance TraNet China

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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

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

Journal Article

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

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

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

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

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

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

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

Journal Article

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

Dai Fudong

Journal Article

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

Yandan FU, Jiahui KANG, Ziyue LI, Xuejun LIU, Wen XU

Journal Article

On the Trends of Autonomous Unmanned Systems Research

Ben M. Chen

Journal Article

A Further Discussion on Trends in the Development of Advanced Manufacturing Technology

YANG Shu-zi, WU Bo, LI Bin

Journal Article

Trends of foodborne diseases in China: lessons from laboratory-based surveillance since 2011

Jikai Liu, Li Bai, Weiwei Li, Haihong Han, Ping Fu, Xiaochen Ma, Zhenwang Bi, Xiaorong Yang, Xiuli Zhang, Shiqi Zhen, Xiaoling Deng, Xiumei Liu, Yunchang Guo

Journal Article

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