Application of FNN to the Modeling of FCCU

IntroductionThe Fluidized Catalytic Cracking ( FCC )process is stable under normal conditions,butsometimes the whole process deviates from theoptimal track due to environmentaldisturbances oraging of the equipment.The optimal productionconditions and the best profit can be found bystudying the stable optimization state.There iscurrently little research or state optimizationapplications due to the difficulties of oldmeasurement and control equipment,modelingdifficulties,formidable research an…     

催化动力学光度法测定微量铁的研究—Fe（Ⅲ）—结晶紫—H2O2体系

研究了在H2 SO4 介质中 ,Fe(Ⅲ )对H2 O2 氧化结晶紫褪色反应的催化作用及最佳实验条件和动力学参数 ,建立了测定痕量铁的新方法 .方法的检出限为 2 73× 10 -11g/L ,测定范围 0～ 2 5 μg/L ,用于各种水中微量铁的测定 ,获得满意结果     

Co(S1-xSex)2.0化合物的制备及对阴极氧还原的催化性能

采用Co4(CO)12、S粉和Se粉为原料,在1,6-己二醇介质中利用低温回流法合成Co(S1-xSex)2.0(x=0.1～0.9)化合物。利用扫描电镜(SEM)、X-射线衍射仪(XRD)和旋转圆盘电极(RDE)表征了化合物的物理特征和电催化性能。这类化合物呈现出聚集的纳米粒子表面形貌,化合物中含有正交结构的CoSe2晶粒和立方结构的Co9S8晶粒。在氧气饱和的0.5 mol/LH2SO4电解液中,Co(S1-xSex)2.0化合物对氧还原反应(ORR)的催化活性、开路电位和交换电流密度随Se含量的增加而增大。     

催化氢化在有机合成中的应用

催化氢化是在催化剂存在的条件下,氢与有机化合物发生的还原反应．催化氢化是还原反应的一种重要形式,具有反应易于控制、产物纯度高、产率高、副产物少的优点,在实验室和工业生产中应用具有重要的意义．     

固体酸催化合成柠檬酸三甲酯

采用常见的固体酸代替强酸催化合成柠檬酸三甲酯,并通过对固体酸催化活性、用量、反应时间和温度对酯化产率影响的探讨,找到一条固体酸催化合成柠檬酸三甲酯的较佳工艺。     

Bimetallic nanostructures with magnetic and noble metals and their physicochemical applications

Bimetallic nanomaterials consisting of magnetic metals and noble metals have attracted much interest for their promising potentials in fields such as magnetic sensors, catalysts, optical detection and biomedical applications. Bimetallic nanomaterials synthesized by wet-chemical methods with different architectures including nanoparticles, nanowires or nanotubes and their assemblies are summarized in this review. The particular properties of bimetallic nanomaterials, especially their magnetic, catalytic and optical properties, are presented. The advance in electron microscopy makes it possible to understand the nanostructural materials at much higher level than before, which helps to disclose the relationship between the microstructures and properties qualitatively and quantitatively.     

微波消解-催化光度法测定茶叶中的硒

在硫酸介质中,硒（Ⅳ）能催化溴酸钾氧化碱蓝6B使之褪色。研究了这一催化反应的动力学条件,并对茶叶样品进行微波消解处理,建立了一种动力学光度法测定痕量Se（Ⅳ）的新方法。Se（Ⅳ）的含量在4×10^-5-4．8×10^-4μg·mL^-1。范围内与吸光度A呈良好的线性关系,相关系数R为0．9994,样品的回收率为98．9％。该方法测定茶叶中微量硒,所用仪器简单,简便快捷,选择性好,灵敏度高。     

Preparation and catalytic effect of porous Co3O4 on the hydrogen storage properties of a Li-B-N-H system

A porous Co_3O_4 with a particle size of 1–3 μm was successfully prepared by heating Co-based metal organic frameworks MOF-74(Co) up to 500 °C in air atmospheric conditions. The as-prepared porous Co_3O_4 significantly reduced the dehydrogenation temperatures of the LiBH_4-2LiNH_2 system and improved the purity of the released hydrogen. The LiBH_4-2LiNH_2-0.05/3Co_3O_4 sample started to release hydrogen at 140 °C and released hydrogen levels of approximately 9.7 wt% at 225 °C. The end temperature for hydrogen release was lowered by 125 °C relative to that of the pristine sample. Structural analyses revealed that the as-prepared porous Co_3O_4 is in-situ reduced to metallic Co, which functions as an active catalyst, reducing the kinetic barriers and lowering the dehydrogenation temperatures of the LiBH_4-2LiNH_2 system. More importantly, the porous Co_3O_4-containing sample exhibited partially improved reversibility for hydrogen storage in the LiBH_4-2LiNH_2 system.     

溴酸钾-偶氮胭脂红B体系催化光度法测定痕量亚硝酸根

基于亚硝酸根在酸性条件下对溴酸钾氧化偶氮胭脂红 B褪色的催化作用 ,建立了灵敏的催化光度测定痕量亚硝酸根的新方法 .测定线性范围为 :0～ 0 .5 ug/ m L,检出限 0 .10 ug/ m L 方法灵敏简便 ,选择性好 ,用于测定水中痕量亚硝酸根 ,结果满意 .     

LaMnO3＋λ的结构差异及对水汽转化反应活性的影响

研究了LaMnO3＋λ系列的结构差异及对水汽转化反应活性的影响，结果表明，钙钛矿结构中的晶格氧参与了交换过程。