TPD study of NH3 adsorption/desorption on the surface of V/Ti, V/Al based catalysts for selective catalytic reduction of Nox by ammonia 2. TPD test of commercial V/W/Ti, V/Al, Pd/V/Al catalysts

The effect of temperature on the adsorption/desorption of ammonia from the air mixture on the surface of commercial binary V/Al and ternary Pd/V/Al, V(0.65 wt.%) /W(6.73 wt.%) /Ti and V(1.8 wt.%) /W(7.3 wt.%) /Ti de-NO_x catalysts has been investigated by temperature-programmed desorption (TPD) method. The ability of the commercial catalysts to adsorb ammonia in the most stable surface species was shown to correlate well with their suppression of the NH₃ oxidation.     

PP/尼龙66/聚碳酸酯/ABS共混高聚物的SEM样品制作

讨论了PP／尼龙66／聚碳酸酯／ABS共混高聚物的扫描电子显微镜样品制作中存在的问题,通过实验,探讨了出该材料最佳的样品制作条件。     

SYNTHESIS OF ORGANOMETALLIC PRECURSORS FOR Si/Zr/C/N-BASED CERAMICS

A new kind of organometallic precursor for Si/Zr/C/N-based ceramics was synthesized from the amine exchangereaction of hexamethylcyclotrisilazane (D_3~N) and tetrakis(diethylamino) zirconium (Zr[NEt_2]_4). Pyrolysis was performedunder nitrogen at 800℃ in a tube furnace equipped with a temperature program controller. The highest pyrolytic yield was67.5%.     

载体对浸渍型Cu/Mn/Mg/K甲醇裂解催化剂的影响

载体对浸渍型Cu/Mn/Mg/K甲醇裂解催化剂的影响;     

Pd/Mn/Ba/Al催化剂的NOx存储-还原性能研究

采用分步等体积浸渍法制备了Pd/Mn/Ba/Al系列催化剂,并用DRIFTS、TPD、TPSR等方法进行了表征,考察了催化剂在不同温度点NOx的存储量以及存储-还原循环中NOx的脱除率.结果表明,NO更容易在MNOx上形成亚硝酸盐,Mn的加入显著提高了Pd/Ba/Al的低温存储活性,与Pd/Ba/Al相比,Pd/Mn/...     

固相微萃取/气相色谱/质谱联用技术在农药残留物分析中的应用

综述了固相微萃取／气相色谱／质谱（SPME／GC／MS）在各种环境水、土壤等样品中农药残留分析中的应用和发展。SPME／GC／MS联用技术具有快速、简便、准确等优点。     

Der Chemische Transport ternärer intermetallischer Phasen in den Systemen Cr/Co/Ge und Co/Ta/Ge

Chemical Vapor Transport of Intermetallic Systems. 11 Chemical Vapor Transport of Ternary Intermetallic Phases in the Systems Cr/Co/Ge and Co/Ta/Ge By means of chemical vapor transport using iodine as transport agent it is possible to prepare a number of ternary intermetallic compounds in the system Co/Cr/Ge as single crystals. The transport behaviour in this ternary system is related to that in the binary systems. Some informations are given about transport phenomena in the systems Co/Cr and Co/Ta/Ge.     

Si/C/F/H materials from laser-explosive decomposition of fluoromethylsilanes

Solid Si/C/H/F materials laser-deposited from gaseous fluoro-methylsilanes are examined by XPS, SEM, IR and Raman spectroscopy and revealed to be a blend of silicon-carbon-based frameworks, possessing some Si-H and C-H bonds, and carbon whose modification is dependent on the structure of the parent fluoromethylsilane. Their properties are affected by contact with the atmosphere: although incorporation of oxygen into silicon-carbon frameworks is a very fast process, the dramatically improved adhesion to aluminium requires long exposure periods.     

Y2O3包覆LiCo1/3Ni1/3Mn1/3O2的电化学性能

通过在硝酸钇水溶液浸渍并焙烧的简单工艺, 在LiCo1/3Ni1/3Mn1/3O2材料表面包覆了一层Y2O3. 采用X射线衍射(XRD), 扫描电子显微镜(SEM), 透射电子显微镜(TEM), 循环伏安(CV)和恒流充放电对包覆和未包覆的LiCo1/3Ni1/3Mn1/3O2进行了测试分析. 结果表明, Y2O3包覆并没有改变LiCo1/3Ni1/3Mn1/3O2的晶体结构, 只存在于LiCo1/3Ni1/3Mn1/3O2的表面; 与未包覆的材料相比, Y2O3包覆后的材料在高电位下具有更好的容量保持率和放电容量. CV测试表明, 包覆层的存在有效抑制了材料层状结构的转变及电极与电解液的负反应.     

TiO2包覆对LiCo1/3Ni1/3Mn1/3O2材料的表面改性

为了提高材料LiCo1/3Ni1/3Mn1/3O2的循环性能, 采用浸渍-水解法对其进行TiO2包覆. 用X射线衍射(XRD)、电化学交流阻抗谱(EIS)、电感耦合等离子体发射光谱(ICP-OES)和恒流充放电测试研究包覆材料的结构和电化学性能. TiO2仅在材料表面形成包覆层, 并未改变材料的结构. TiO2包覆能提高材料LiCo1/3Ni1/3Mn1/3O2的倍率性能和循环性能, TiO2包覆后的材料在5.0C(1.0C=160 mA·g-1)下的放电容量达到0.2C下的66.0%, 而包覆前的材料在5.0C下的放电容量仅为其0.2C下的31.5%. 包覆后的材料在2.0C下循环12周后的容量没有衰减, 而未包覆的材料容量保持率仅为94.4%. EIS测试表明包覆材料性能的提高是由于循环过程中材料的界面稳定性得到了提高. 循环后材料的XRD和ICP-OES测试表明, 包覆层能提高材料LiCo1/3Ni1/3Mn1/3O2的结构稳定性.     

PLASMA POLYMERIZATION OF ACETYLENE/CO_2/H_2

A study has been made on the plasma polymerization of acetylene/CO_2/H_2 in a capacitively coupled RF plasma. The monomer mixture yielded a crosslinked film with light brown color. A kinetic study is reported for the plasma polymer ization of acetylene/CO_2/H_2. The effects of discharge power level and reactor geometry on the rate of polymer formation are reported. The structure of the plasma polymer is investigated by IR study.     

有机膨润土对水中苯、甲苯、乙苯、二甲苯和铬酸根离子的吸附性能

污水处理;有机膨润土对水中苯、甲苯、乙苯、二甲苯和铬酸根离子的吸附性能     

MnO2/PPy/PANI三元纳米管复合材料的合成及其电化学电容性能

在聚苯胺（PANI）和二氧化锰（MnO2）存在的条件下,以FeCl3/甲基橙为模板,通过化学氧化法聚合吡咯(Py)单体,制备MnO2/PPy/PANI纳米管复合材料。 利用X射线衍射、透射电子显微镜、红外光谱和电化学测试等多种测试技术对复合材料进行物性表征和电化学电容性能测试,并讨论了不同含量的PANI对复合物材料的结构和性能的影响。 结果表明,由于PANI、MnO2与PPy三者的相互协同作用,以及材料管状结构的大比表面积,使三元复合材料具有比二元复合材料要大的电化学活性。 所合成的三元复合材料最大比容量达到458.4 F/g。     

[NiFe/Cu/Co/Cu]n纳米多层线的电化学制备及表征

采用电沉积法,在阳极氧化铝(AAO)模板中制备了[NiFe/Cu/Co/Cu]_n多层纳米线.利用扫描电子显微镜(SEM)及透射电子显微镜(TEM)对纳米多层线的表面形貌及结构进行了表征,纳米线阵列高度有序、直径均一、层状结构清晰,NiFe层厚度约40 nm,Cu层厚度约60 nm,Co层厚度约15 nm,各子层厚度可控.利用X射线能谱分析仪(EDS)对纳米多层线NiFe层的成分进行了测试,Ni,Fe的原子比为4:1.利用X射线衍射仪(XRD)对[NiFe/Cu/Co/Cu]_n纳米多层膜和多层线结构进行了测试,多层膜为面心立方(fcc)结构,多层线NiFe层为面心立方(fcc)结构,Cu层为六方密排hcp(100),Co层为面心立方(fcc)结构.与组成、结构完全相同的多层膜相比,[NiFe/Cu/Co/Cu]_n多层纳米线具有更优越的巨磁电阻性能.     

Borazine Based Molecular Single Source Precursors for Si/B/N/C Ceramics

The family of borazines [(SiCl₃)NB(Cl_n(CH₃)_1–n]₃ was synthesized and characterized by NMR and IR spectroscopy, as wellas by single crystal structure analysis. After cross‐linking with methylamine, a soluble polymer was obtained that was transformed to anall‐inorganic random network of nominal composition Si_1.0B_1.0N_3.0C_0.9O_0.1 (idealized SiBN₃C) at 1400 °C. With an on‐set of weight loss at 1840 °C and a resistance against rapid oxidation in pure oxygen of up to 1300 °C, the new Si/B/N/C ceramic shows a high temperature performance similar to those of previously reported Si/B/N/C materials.     

不同放大级Fe/Cu/K/SiO2催化剂的表征及其浆态床费托合成反应性能

采用连续共沉淀和喷雾干燥成型相结合的方法,制备了实验室级和放大级微球状费托(FT)合成Fe/Cu/K/SiO2催化剂.实验室级催化剂的颗粒尺寸为5～15μm,放大级催化剂的颗粒尺寸为40～60μm.利用低温N2物理吸附、H2程序升温还原、CO2程序升温脱附、穆斯堡尔谱和X射线衍射等表征手段考察了催化剂的织构性质、还原行为、碳化行为及物相变化.结果表明,与实验室级催化剂相比,放大级催化剂具有较大的晶粒尺寸和孔径、较小的比表面积和较弱的表面碱性,催化剂的还原和碳化受到抑制.浆态床FT合成反应及扫描电子显微镜结果表明,放大级催化剂经诱导期达到稳定状态后,转化率可达到实验室级催化剂的水平,且具有很高的稳定性、重质烃选择性及抗磨损性.     

PVP/Pd/IrO_2/Nafion修饰微电极用于成纤维细胞中一氧化氮释放的研究

采用PVP/Pd/IrO_2/Nafion修饰电极对成纤维细胞中NO的释放情况进行了研究 。结果表明,在正常状态下,采用NO前体L-精氨酸和乙酰胆碱对成纤维细胞进行刺 激后没有NO的释放;当用脂多糖进行诱导后,则释放出高浓度的NO,加入L-精氨酸 和乙酰胆碱都促进了NO的合成,而L-NNA的加入则逆转了L-精氨酸和乙酰胆碱的作 用。     

Electrochemical performance of a nano SnO2-modified LiNi1/3Co1/3Mn1/3O2 cathode material

The nano SnO₂-modified LiNi_1/3Co_1/3Mn_1/3O₂ was successfully prepared by a carrier transfer method. The pristine and modified samples were characterized with various techniques such as XRD, SEM, XPS and EDS. The results showed that the SnO₂ particles did not enter the crystal structure of LiNi1/3Co1/ 3Mn1/3O₂, many nano SnO₂ particles were uniformly covered on the surface of LiNi_1/3Co_1/3Mn_1/3O₂ and the modified thin layer could inhibit the dissolution of transition metal oxides. The electrochemical tests indicated that the existence of nano SnO₂ could improve the discharge capacity and rate capability owing to the decreased interfacial polarization. The cycling stability was remarkably improved at room temperature and 55 ℃. The XRD patterns of the fresh NCM electrode and after 50 cycles proved that the structural change of NCM was not so effective on the capacity fade.     

光谱法研究CdSe/CdS/ZnS量子点与壳聚糖的复合

通过CdSe/CdS/ZnS量子点与壳聚糖之间的静电作用,用共混法制备了壳聚糖-CdSe/CdS/ZnS复合物.用荧光光谱、紫外-可见光谱、红外光谱对所得的壳聚糖-CdSe/CdS/ZnS复合物进行了表征.研究结果表明:壳聚糖-CdSe/CdS/ZnS复合物具有良好的光学性能.     

GC/MS和ESI/MS/MS同位素内标法检测甲基丙二酸血症

以甲基丙二酸血症为对象,分别用GC/MS和ESI/MS/MS方法对该疾病进行了定性和定量检测.通过对样品前处理和分离条件的改善,对疾病的标识化合物之一甲基丙二酸进行了定量测定,其稳定性、精密度和回收率结果很好.同时比较了GC/MS和ESI/MS/MS两种方法的特点,发现两种方法的结合不仅可满足新生儿代谢疾病筛查的要求,同时还可对高危人群进行诊断.