CuO/ZrO_2催化剂的催化性能研究

研究了粉体性能、Cu O负载量及灼烧温度对 Cu O/Zr O2 催化剂 CO氧化性能的影响 .结果表明 ,催化剂的活性随氧化铜的负载量的增加而增加 ,较低比表面积的 Zr O2 载体更容易制备高活性的催化剂 .实验还发现 ,Cu O/Zr O2 催化剂的活性与载体单位表面 Cu O的负载量相关 ,Cu O的负载量超过载体分散容量为 75% ,是制备高活性催化剂的重要条件 .     

利用标准等温线分析活性炭的完全孔分布

利用我们从标准等温线性质发展的孔分布计算两个新方法——完全无模型孔分布计算法和改进的微孔分析法对有代表性的九个活性炭样品进行了完全孔分布分析.用吸附仪测量样品的低温氮吸附等温线,用Pickett方程关联了这些吸附等温线,发现n值在1.1—1.4之间.因常数C值在100—300之间,选用标准等温线n_2作为完全孔分布分析的依据.获得了总表面积、微孔的表面积和体积、非微孔的表面积和体积以及平均微孔水力半径等主要孔结构参数,并获得了所有样品的完全孔分布.两个比值SR和VR在0.9—1.1之间,结果是令人满意的.分析结果指出,DX-09-1-1,7S及J三个样品基本上全是微孔,而其余的炭毡及BPL炭样品都有相当数量的非微孔.这些结果说明,利用标准等温线进行活性炭样品的完全孔分布分析是实用的.     

共沉淀-超临界流体干燥法合成CaO-ZrO_2复合氧化物超微粉体及其烧结性能研究(Ⅱ)粉体的烧结性能

用共沉淀－超临界流体干燥法合成ＣａＯ－ＺｒＯ２（１５ｍｏｌ．％ＣａＯ）复合氧化物超微粉末,并对粉末的烧结性能进行了研究。实验表明,该法合成的粉末具有很高的烧结活性,能在较低的温度及较短的时间内完成致密化过程。４００℃,２ｈ煅烧的粉体加压成型后于１１００℃下保温０．５ｈ,其体积密度可达理论值的９８．２％,开口气孔仅为０．０００８ｃｍ３／ｇ。     

Review on Stress Corrosion and Corrosion Fatigue Failure of Centrifugal Compressor Impeller

Corrosion failure,especially stress corrosion cracking and corrosion fatigue,is the main cause of centrifugal compressor impeller failure.And it is concealed and destructive.This paper summarizes the main theories of stress corrosion cracking and corrosion fatigue and its latest developments,and it also points out that existing stress corrosion cracking theories can be reduced to the anodic dissolution(AD),the hydrogen-induced cracking(HIC),and the combined AD and HIC mechanisms.The corrosion behavior and the mechanism of corrosion fatigue in the crack propagation stage are similar to stress corrosion cracking.The effects of stress ratio,loading frequency,and corrosive medium on the corrosion fatigue crack propagation rate are analyzed and summarized.The corrosion behavior and the mechanism of stress corrosion cracking and corrosion fatigue in corrosive environments,which contain sulfide,chlorides,and carbonate,are analyzed.The working environments of the centrifugal compressor impeller show the behavior and the mechanism of stress corrosion cracking and corrosion fatigue in different corrosive environments.The current research methods for centrifugal compressor impeller corrosion failure are analyzed.Physical analysis,numerical simulation,and the fluid-structure interaction method play an increasingly important role in the research on impeller deformation and stress distribution caused by the joint action of aerodynamic load and centrifugal load.     

NiO／SiO_2－Al_2O_3超细催化剂上CO氧化反应的研究

采用溶胶凝胶－超临界干燥法制备的ＮｉＯ／ＳｉＯ２－Ａｌ２Ｏ３催化剂对ＣＯ氧化显示出可与贵金属催化剂相类比的优良活性。以ＣＯ氧化的最低完全转化温度为基准，研究了不同制备参数对反应行为的影响规律，并结合程序升温还原（ＴＰＲ）结果对其活性位进行了探讨。结果表明，在ＮｉＯ／ＳｉＯ２－Ａｌ２Ｏ３系催化剂上ＣＯ氧化反应具有两类不同的活性位：ＮｉＯ及八面体配位的镍；制备参数通过影响活性位从而影响反应行为；优化制备参数为ＮｉＣｌ２前驱物、ＳｉＯ２载体、３％含量及制载体浸渍     

非常规材料在室内空间的创作研究

为了发扬非常规材料在室内的应用,提升材料在室内空间中完美表现。通过分析非常规材料的装饰特性,研究非常规材料在室内的创作实例,提出非常规材料在室内的创作新思路,找到材料与室内空间的完美结合之路。非常规材料在室内空间的创作具有广阔的前景。     

弹性问题中的一种新型边界元法

对边界轮廓法（ＢＣＭ——ＢｏｕｎｄａｒｙＣｏｎｔｏｕｒＭｅｔｈｏｄ）作了进一步的研究，给出了三维问题的势函数形式和二维问题的应力计算方法及其势函数。实例计算表明该方法具有较高的精度     

脉冲反应和TPD技术研究煤焦的CO2气化行为

用脉冲反应和ＴＰＤ技术研究了铁催化煤焦－ＣＯ２气化行为，考察了铁负载量、催化剂前躯体、复合金属催化剂对催化活性的影响。并用Ｘ－射线光电子能谱（ＸＰＳ）表面分析技术测定了煤焦中的铁原子的表面浓度。研究结果表明，催化剂前躯体为Ｆｅ（ＮＯ３）３是活性最高，ＦｅＳＯ４次之，ＦｅＣｌ３最小，这些影响因素主要表现在煤焦中铁的表面浓度和催化剂存在形态２个方面。ＴＰＤ技术考察了气化反应过程中，煤焦表面生成的炭氧络     

硫化氢的高温脱除

本文介绍新的高温脱硫剂的研究开发，并对高温条件下硫化氢催化分解，反应 偶联脱除硫化氢，应用膜反应器脱除硫化氢技术以及其它新的脱硫技术的发展进行了回顾。     

A Novel Wound Dressing Based on Ag/Graphene Polymer Hydrogel: Effectively Kill Bacteria and Accelerate Wound Healing

Avoiding wound infection and retaining an appropriate level of moisture around woundz are major challenges in wound care management. Therefore, designing hydrogels with desired antibacterial performance and good water‐maintaining ability is of particular significance to promote the development of wound dressing. Thus a series of hydrogels are prepared by crosslinking of Ag/graphene composites with acrylic acid and N,N′‐methylene bisacrylamide at different mass ratios. The antibacterial performance and accelerated wound‐healing ability of hydrogel are systematically evaluated with the aim of attaining a novel and effective wound dressing. The as‐prepared hydrogel with the optimal Ag to graphene mass ratio of 5:1 (Ag5G1) exhibits stronger antibacterial abilities than other hydrogels. Meanwhile, Ag5G1 hydrogel exhibits excellent biocompatibility, high swelling ratio, and good extensibility. More importantly, in vivo experiments indicate that Ag5G1 hydrogel can significantly accelerate the healing rate of artificial wounds in rats, and histological examination reveals that it helps to successfully reconstruct intact and thickened epidermis during 15 day of healing of impaired wounds. In one word, the present approach can shed new light on designing of antibacterial material like Ag/graphene composite hydrogel with promising applications in wound dressing.