改善加氢裂化柴油及尾油光安定性的探讨     

朱耘青 《茂名学院学报》1992,(1)

本文阐述了几种解决加氢裂化柴油或尾油制取润滑油时,光安定性问题的方法。说明利用加氢裂化柴油与尾油制取中、高档润滑油是可行的。  相似文献   

复合连接层等离子喷涂热障涂层的静态氧化性能研究     

张继红 《鸡西大学学报》2002,2(2):48-50

采用等离子喷涂（PS）方法，在GH536高温合金基材上制备了传统的双层热障涂层（TBCs)和添加Al2O3复合连接层热障涂层。传统TBCs结构为Ni22Cr10A1Y合金连接层和8wt.%Y2O3部分稳定的ZrO2(8YSZ)陶瓷顶层；双层连接层为Ni22Cr10AlY及Ni22Cr10AlY＋Al2O3复合层。试样的100小时、1050℃及1050静态氧化试验结果表明：采用复合连接层的TBCs氧化阻力提高；1050℃时复合连接层的阻氧能力降代。  相似文献   

高铁闪锌矿精矿高氧氨浸工艺的理论研究     

王书民  樊雪梅  陈凤英 《商洛学院学报》2011,25(2)

为了克服高铁闪锌矿现行冶炼工艺不能同时满足锌的高提取率和铁的低提取率的要求,在分析火法炼锌、传统湿法炼锌和完全湿法酸浸冶锌工艺的基础上,提出了高铁闪锌矿精矿的高氧催化氧化氨浸工艺,并从热力学和动力学的角度对该工艺进行了系统的理论研究,结果表明高铁闪锌矿精矿高氧催化氧化氨浸工艺是可行的.  相似文献   

Construction of hollow mesoporous silica nanoreactors for enhanced photo-oxidations over Au-Pt catalysts     

Hao Tian  Jinhui Zhao  Xinyao Wang  Lizhuo Wang  Hao Liu  Guoxiu Wang  Jun Huang  Jian Liu  G Q Lu 《国家科学评论(英文版)》2020,7(11):1647

It is highly desirable to design hollow structures with multi-scale functions by mimicking cells for the construction of micro/nanoreactors. Herein, we report the construction of hollow-structured submicrometer-photoreactors with bimetallic catalysts loaded within mesoporous silicas. The synthesis parameters are optimized to study the evolution of hollow structure through hydrothermal treatment and an ‘adhesive-contraction’ formation mechanism is proposed. AuPt@HMZS catalysts exhibited a broader absorbance region under visible light and the adsorption edge displayed a red-shift, indicating the strong metal–metal interactions at the alloy interface. The reaction performance of the coupled Au-Pt catalysts can be tuned to achieve excellent catalytic activity in cinnamyl alcohol oxidation to cinnamic acid for 3.1 mmol g⁻¹ with 99% selectivity. The proposed strategy to build hollow structures as multifunctional micro/nanoreactors is promising for the design of high-performance and sustainable catalysts for chemical synthesis.  相似文献   

Large dipole moment induced efficient bismuth chromate photocatalysts for wide-spectrum driven water oxidation and complete mineralization of pollutants     

Xianjie Chen  Yuan Xu  Xinguo Ma  Yongfa Zhu 《国家科学评论(英文版)》2020,7(3):652

Herein, a wide-spectrum (∼678 nm) responsive Bi₈(CrO₄)O₁₁ photocatalyst with a theoretical solar spectrum efficiency of 42.0% was successfully constructed. Bi₈(CrO₄)O₁₁ showed highly efficient and stable photocatalytic water oxidation activity with a notable apparent quantum efficiency of 2.87% (420 nm), superior to many reported wide-spectrum driven photocatalysts. Most remarkably, its strong oxidation ability also enables the simultaneous degradation and complete mineralization for phenol, and its excellent performance is about 23.0 and 2.9 times higher than CdS and P25-TiO₂, respectively. Its high activity is ascribed to the giant internal electric field induced by its large crystal dipole, which accelerates the rapid separation of photogenerated electron–hole pairs. Briefly, the discovery of wide-spectrum bismuth chromate and the mechanism of exponentially enhanced photocatalytic performance by increasing the crystal dipole throw light on improving solar energy conversion.  相似文献   

碳源投加量对除磷脱氮的影响     

吴代顺  王淦  涂柽峰 《宁德师专学报(自然科学版)》2012,24(3):254-257

为了提高氧化沟脱氮除磷的效果,提出了改良型氧化沟工艺,并且进行了碳源投加量对除磷脱氮的影响的试验验证.首先,给出了合肥市某污水处理厂的工程概况,并且提出了试验材料与方法.其次,分析了改良型氧化沟工艺在该污水处理厂运行效果,试验表明：（1）碳源投加量越大,释磷量越大;（2）在厌氧时污泥释磷越充分,曝气时吸磷量越大,在曝气180min后,80mg/L碳源污泥吸磷量明显小于160mg/L碳源污泥吸磷量;（3）在180min,C：N=5：1时,其硝酸盐含量和亚硝酸盐含量均小于C：N=3：1时的含量,碳源越充足,硝化反硝化效果越好,最终TN含量越小.  相似文献   

板带退火生产过程中的露点问题探讨     

潘利波  胡吟萍  魏星 《武汉工程职业技术学院学报》2012,24(2):11-13

对退火过程中露点的影响因素及其对生产与设备造成的影响进行了阐述:退火过程中的露点的影响因素主要有带钢表面总的油含量、加热速度和H2吹扫速度,以及钢带所带的乳化液的多少;露点温度的高低对钢的氧化、炉辊的结瘤甚至汽车板产品后续的脱脂性能都有影响。  相似文献   

氧化还原反应的快速配平方法     

孙德慧  张吉林  张吉良 《陕西理工学院学报(社会科学版)》2001,(3)

在氧化还原反应的配平中 ,提出了离子反应的氧化数_电荷法 ,不用记忆繁琐的介质添加经验规则 ,就能实现快速准确地配平 .同时对其他类型的氧化还原反应 ,归纳整理出了氧化数差值法、整体氧化数法、待定系数法等快速配平方法 .  相似文献   

Degradation of chlorophenol by in-situ electrochemically generated oxidant     

丛燕青  吴祖成  叶倩  谭天恩 《浙江大学学报(A卷英文版)》2004,5(2):180-185

A novel in-situ electrochemical oxidation method was applied to the degradation of wastewater containing chlorophenol. Under oxygen sparging, the strong oxidant, hydrogen dioxide, could be in-situ generated through the reduction of oxygen on the surface of the cathode. The removal rate ofchlorophenol could be increased 149% when oxygen was induced in the electrochemical cell. The promotion factor was estimated to be about 82.63% according to the pseudo-first-order reaction rate constant (min-1). Important operating parameters such as current density, sparged oxygen rate were investigated.Higher sparged oxygen rate could improve the degradation of chlorophenol. To make full use of oxygen, however, sparged oxygen rate of 0.05 m3/h was adopted in this work. Oxidation-reduction potential could remarkably affect the generation of hydrogen peroxide. It was found that the removal rate of chlorophenol was not in direct proportion to the applied current density. The optimum current density was 3.5 mA/cm2 when initial chlorophenol concentration was 100 mg/L and sparged oxygen rate was 0.05 m3/h.  相似文献   

气浮-接触氧化法处理油脂厂生产废水     

张自红 《合肥联合大学学报》2006,16(1):34-35

采用气浮-接触氧化法处理油脂厂生产废水，可使出水达到一级排放标准．结合工程实际，介绍油脂厂生产废水处理工程的工艺设计．该工艺运行费用低，易于维护．  相似文献