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细胞旋转 1

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Direct synthesis of dimethyl carbonate over rare earth oxide supported catalyst

JIANG Qi, CHENG Jiye, GAO Zhiqin

《化学科学与工程前沿（英文）》 2007年第1卷第3期页码 300-303 doi: 10.1007/s11705-007-0055-z

摘要： Solid base catalysts for the direct synthesis of dimethyl carbonate (DMC) from carbon dioxide, methanol, and propylene oxide were prepared by loading KCl and KCO on the surface of LaO, YO, CeO and NdO. The catalysts were characterized by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) techniques. The catalytic activities were efficiently influenced by the preparation conditions. The optimal loading amount of KCO is 17.6% (mass) for KCl-KCO/YO and 22.2% for other catalysts. Supports affected the activity of catalyst. KCl-KCO/NdO exhibited the highest activity. The activity of KCl-KCO/YO increased with the increase of calcination temperature in the range of 800ºC–900ºC. The formation of KYO, YOCl or YO species probably promoted the catalysts.

关键词： thermogravimetric analysis increase KCl-KCO/NdO catalytic KCl-KCO/YO

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Corrosion behavior of Fe–Cr–Ni based alloys exposed to molten MgCl₂–KCl–NaCl salt with over-added

《化学科学与工程前沿（英文）》 2023年第17卷第10期页码 1608-1619 doi: 10.1007/s11705-023-2349-1

摘要： MgCl₂–NaCl–KCl salts mixture shows great potential as a high-temperature (> 700 °C) thermal energy storage material in next-generation concentrated solar power plants. Adding Mg into molten MgCl₂–NaCl–KCl salt as a corrosion inhibitor is one of the most effective and cost-effective methods to mitigate the molten salt corrosion of commercial Fe–Cr–Ni alloys. However, it is found in this work that both stainless steel 310 and Incoloy 800H samples were severely corroded after 500 h immersion test at 700 °C when the alloy samples directly contacted with the over-added Mg in the liquid form. The corrosion attack is different from the classical impurity-driven corrosion in molten chloride salts found in previous work. Microscopic analysis indicates that Ni preferentially leaches out of alloy matrix due to the tendency to form MgNi₂/Mg₂Ni compounds. The Ni-depletion leads to the formation of a porous corrosion layer on both alloys, with the thickness around 204 µm (stainless steel 310) and 1300 µm (Incoloy 800H), respectively. These results suggest that direct contact of liquid Mg with Ni-containing alloys should be avoided during using Mg as a corrosion inhibitor for MgCl₂–NaCl–KCl or other chlorides for high temperature heat storage and transfer.

关键词： concentrated solar power (CSP) Mg corrosion inhibitor Mg–Ni intermetallic salt purification thermal energy storage (TES)

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生物细胞的旋转——基本原理及应用 Review

Tao Tang, Yoichiroh Hosokawa, Takeshi Hayakawa, Yo Tanaka, Weihua Li, Ming Li, Yaxiaer Yalikun

《工程（英文）》 2022年第10卷第3期页码 110-126 doi: 10.1016/j.eng.2020.07.031

摘要：

细胞旋转是现代生物科学中最重要的细胞操作技术之一，不仅允许从任意角度观察细胞，而且还简化了分析细胞力学特性、表征细胞生理学和进行显微手术的程序。在广泛的学术和工业应用中，已经报道了许多细胞旋转的方法。其中，最受欢迎的是基于微型机器人的直接接触控制和基于场的非接触方法（如光场、磁场、电场、声场和流体动力场方法）。本文首先总结了这六大类方法的基本机制、优点和缺点，然后详细讨论了它们的区别和局限性。本文旨在缩短每种方法之间的差距，并说明细胞旋转领域目前的研究进展及未来前景。

关键词：细胞旋转细胞重新定向显微操作微流控技术

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Development of highly active coated monolith SCR catalyst with strong abrasion resistance for low-temperature application

Lina GAN,Shan LEI,Jian YU,Hongtao MA,Yo YAMAMOTO,Yoshizo SUZUKI,Guangwen XU,Zhanguo ZHANG

《环境科学与工程前沿（英文）》 2015年第9卷第6期页码 979-987 doi: 10.1007/s11783-015-0824-8

摘要： Monolith SCR catalysts coated with V O -WO /TiO were prepared by varying binder and coating thickness. Comparing with a monolith extruded with 100% V O -WO /TiO powder, a coated monolith with a catalyst-coating layer of 260 μm in thickness exhibited the similar initial NO reduction activity at 250°C. After 4 h abrasion (attrition) in an air stream containing 300 g·m fine sands (50–100 μm) at a superficial gas velocity of 10 m·s , the catalyst still has the activity as a 100% molded monolith does in a 24-h activity test and it retains about 92% of its initial activity at 250°C. Estimation of the equivalent durable hours at a fly ash concentration of 1.0 g·m in flue gas and a gas velocity of 5 m·s demonstrated that this coated monolith catalyst is capable of resisting abrasion for 13 months without losing more than 8% of its initial activity. The result suggests the great potential of the coated monolith for application to de-NO of flue gases with low fly ash concentrations from, such as glass and ceramics manufacturing processes.

关键词： coated monolith low-temperature denitration abrasion resistance attrition

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Modeling of specific structure crystallization coupling with dissolution

Yuanhui JI, Hongliang QIAN, Chang LIU, Xiaohua LU, Xin FENG, Xiaoyan JI,

《化学科学与工程前沿（英文）》 2010年第4卷第1期页码 52-56 doi: 10.1007/s11705-009-0301-7

摘要： In this paper, the research framework for specific structure crystallization modeling has been proposed in which four steps are required in order to investigate the rigorous crystallization modeling by thermodynamics. The first is the activity coefficient model of the solution, the second is Solid-Liquid equilibrium, the third and fourth are the dissolution and crystallization kinetics modeling, respectively. Our investigations show that the mechanisms of complex structure formation and microphase transition can be analyzed by combining the dissolution and crystallization kinetics modeling. Moreover, the formation mechanism of the porous KCl has been analyzed, which may provide a reference for the porous structure formation in the advanced material synthesis.

关键词： structure crystallization activity coefficient reference KCl dissolution