Low-Temperature Denitrification Performance of Cu2O/Activated Carbon Catalysts for Selective Catalytic Reduction of NOx by CO

To improve the denitrification performance of carbon-based materials for sintering flue gas,we prepared a composite catalyst comprising coconut shell activated carbon(AC)modified by thermal oxidation air.The microstructure,the specific surface area,the pore volume,the crystal structure,and functional groups presented in the prepared Cu2O/AC catalysts were thoroughly characterized.By using scanning electron microscopy(SEM),nitrogen adsorption/desorption isotherms,Fourier-transform infrared(FTIR)spectroscopy and X-ray diffractometry(XRD),the effects of Cu2O loading and calcination temperature on Cu2O/AC catalysts were investigated at low temperature(150℃).The research shows that Cu on the Cu2O/AC catalyst is in the form of Cu2O with good crystalline performance and is spherical and uniformly dispersed on the AC surface.The loading of Cu2O increases the active sites and the specific surface area of the reaction gas contact,which is conducive to the rapid progress of the carbon monoxide selective catalytic reduction(CO-SCR)reaction.When the loading of Cu2O was 8%and the calcination temperature was 500℃,the removal rate of NOx facilitated by the Cu2O/AC catalyst reached 97.9%.These findings provide a theoretical basis for understanding the denitrification of sintering flue gas.

Anisotropic Thermal Diffusivity Measurements in High-Thermal-Conductive Carbon-Fiber-Reinforced Plastic Composites

This paper presents the temperature dependence of in-plane thermal diffusivity and anisotropy distribution for pitch-based carbon-fiber-reinforced polymers (CFRPs). The measurement was performed using the laser-spot periodic heating method. The samples were unidirectional (UD) and crossply (CP) CFRPs. All carbon fibers of the UD samples ran in one direction, while those of the CP samples ran in two directions. In both UD and CP CFRPs, from -80°C to +80°C, temperature dependence of thermal diffusivity values increased as temperature decreased. In this temperature range, the anisotropic ratio between the fiber direction and its perpendicular direction of the UD CFRP was 106 - 124. During the anisotropy distribution measurement, it was found that thermal anisotropy can be visualized by scanning the laser in a circle on the sample. The thermal diffusivity of the UD CFRP in the fiber direction was 17 times larger than that in the 15°direction, and the thermal diffusivity in the other directions was lower than that in the 15°direction. The anisotropy distribution for the CP CFRP reflected its inhomogeneous structure.

Carbon Dots-in-Zeolite via In-Situ Solvent-Free Thermal Crystallization:Achieving High-Efficiency and Ultralong Afterglow Dual Emission

Organic afterglow materials are highly desirable for optoelectronic applications,but they usually suffer from complex preparation process,low quantum efficiency,and short lifetime due to the ultrafast deactivation of the highly active excited states involved.Here,we succeeded in achieving solventfree thermal syntheses of high-efficiency afterglow CDs@zeolite composite materials by simply grinding the solid raw materials of zeolite and precursor CDs at room temperature,followed by thermal crystallization.This method afforded maximum embedding of CDs into growing zeolite crystals,as well as strong host–guest interaction to surpass the nonradiative transition of CDs,thus producing composite materials with ultralong dual emission of thermally activated delayed fluorescence and room temperature phosphorescence with a record high lifetime of 1.7 and 2.1 s,respectively,and the quantum yield of 90.7%.Furthermore,in a preliminary experiment,we applied the composite materials in alternatingcurrent light-emitting diode supplementary lighting,which exhibited a promising potential in optoelectronic applications.

活性白土/聚碳酸亚丙酯复合材料的制备与性能

采用溶液共混的方法制备了活性白土/聚碳酸亚丙酯(PPC)复合材料,研究了活性白土的含量对所得复合材料结构、热性能和力学性能的影响。研究结果表明低含量的活性白土在PPC基体中具有较好的分散性,且两者之间具有较好的界面作用;活性白土的引入有效地提高了PPC的玻璃化转变温度(T_(g))和力学强度,同时也可以在一定程度上提高PPC的热稳定性。

深穿透地球化学多方法组合在中条山厚层黄土覆盖区找矿试验研究

在运城盆地厚层黄土覆盖区所开展的深穿透地球化学找矿试验，采用黏土吸附态金属离子（Cu、Co、Nj、Zn等）、热释碳酸盐（△C）、电导率【类似n％】、F离子选择性电极四种方法同时进行。试验对象是深埋在黄土下200—300m以深两个铜镍多金属硫化物矿床。通过本次试验，所选四种方法均不同程度捕捉到巨厚黄土覆盖200m以深的金属矿床成矿地球化学信息，初步证明所选方法是有效的、可行的。其中粘土吸附态金属离子Co、N1、Cu、Zn异常强度与在矿体中的浓集强度呈明显的正相关关系，间接找矿信息热释碳酸盐（△C）、电导率【类似n％】也有一致的趋势。进一步将四种方法的异常信息进行叠加，所形成的组合异常更好地克服了单信息微弱、不稳定的缺陷，可更有效地指示深埋隐伏多金属矿体，明显增大异常对矿体的反映率。本次所选的四种方法，野外采样方法简单，操作简便，与常规土壤化探工作方法基本一致，生产与测试成本能为基层单位接受；对同类土壤覆盖区开展深穿透地球化学方法找矿有推广价值。

对失效活性炭热再生过程的思考

失效活性炭的再生利用问题一直是困扰活性炭低成本和大规模推广应用的瓶颈之一。为此,对煤质活性炭的热再生/活化过程进行了研究分析,总结出需要关注和解决的关键问题。同时,针对某些金属氧化物或矿物质对炭-水蒸气反应的催化作用,特别是在移除有机杂质方面的作用,提出“可再生活性炭”(Re-ACs)的制备和应用的新思路。与常规活性炭相比,Re-ACs可降低其再生/活化过程的反应条件,这对于减少能耗和炭损,以及延长活性炭的使用周期都具有积极的意义。