无定形（磷酸氢—二苯基次膦酸）锆—氯化铁复合物催化烷基化反应

制得无定形（磷酸氢－二苯基次膦酸）锆－氯化铁复合物Ｚｒ（ＨＰＯ４）１．５（Ｏ２Ｐ（Ｃ６Ｈ５）２）．（ＦｅＣｌ２（ＯＨ）。该复合不易吸潮，不冒烟，在空气中稳定，对代烷与芳得在液相的烷基化应有较好的催化活性，反应条件温和，产物收率高，操作方便，后处理简单，并可多次重复使用。     

固体超酸POSA催化醇脱水制烯

固体超酸由于其优良的催化性能,近年来倍受重视。其中以全氟骨架的磺酸树脂Nafion H应用最广。POSA(全氟辛基磺酸,C_8F_(17)SO_3H)也是一种化学性质稳定、易回收的固体超酸,具有与Nafion H相似的氟碳链磺酸结构。     

丙烷在Ce-Fe/Al2O3/cordierite上选择性催化还原NO

利用凝胶溶胶法和浸渍法制备了Ce-Fe/Al₂O₃/cordierite催化剂,实验研究了其催化丙烷选择性还原NO的特性。结果表明,当铈的负载量从1%增加至5%时,Ce-Fe/Al₂O₃/cordierite的C₃H₈-SCR性能先增强后减弱,3.5Ce-Fe/Al₂O₃/cordierite具有最佳的脱硝性能,在有氧条件下,600℃时可实现96.5%的脱硝效率。Ce的加入能够提升Fe/Al₂O₃/cordierite催化剂的抗硫性能。烟气中通入0.02%的SO₂后,3.5Ce-Fe/Al₂O₃/cordierite催化丙烷还原NO的转化率始终维持在93%,而没有经过Ce修饰的Fe/Al₂O₃/cordierite的NO转化率从88%下降为80%左右。利用XRD、N₂吸附-脱附、SEM、H₂-TPR、吡啶吸附红外光谱等手段研究了催化剂的物理化学性质。结果表明,加入助剂铈能与Fe形成了固溶体,增加催化剂表面Lewis酸浓度和氧化还原能力,从而提高了催化丙烷还原NO的性能。过多的铈引入会减少Fe₂O₃结晶体的形成,不利于在C₃H₈-SCR反应中形成NO₂/NO₃^-物种,从而导致NO还原效率下降。     

有机-无机杂化磷酸锆及胺插层化合物的MAS NMR 研究

The layered zirconium [N-(phosphonomethyl)iminodiacetic acid-phosphate] Zr(HPO₄)_1.34[O₃PCH₂N-(CH₂CO₂H)2]_0.66·H₂O can only be prepared in the series of the zirconium phosphonate-phosphates Zr(HPO₄)_2-x[O₃PCH₂N(CH₂CO₂H)₂]_x·H2O (ZPPMIDA) by the reaction of zirconium oxychloride with phosphonic acid and H₂O₃PCH₂N(CH₂CO₂H)₂ in the designed x range of 0 < x < 2, which had been monitored by using the phosphorus integration value ratio of HPO₄^2- and [O₃PCH₂N(CH₂CO₂H)₂]^2- group in the ³¹P MAS NMR spectra. After intercalation of n-butyl amine, the ³¹P chemical shift of HPO₄^2- group at -8.0~-10.0 ppm moved to 6.0 ppm with a change of 14.0~16.0 ppm and that of [O₃PCH₂N(CH₂CO₂H)₂]^2- group at -29.1 ppm changed only 0.5 ppm. Due to the pillared effect of [O₃PCH₂N(CH₂CO₂H)₂]^2- groups on the interlayer spacing, intercalated amines such as n-butylamine, n-hexyl amine and n-octyl amine easily reacted with HPO₄^2- group in ZPPMIDA (x=0.66) rather than that in α-ZrP, and carboxylic group (-CO₂H) in ZPPMIDA (x=0.66).     

点焊箱型铜构件轴压性能试验及有限元分析

为研究振动台试验中常用的点焊箱型截面构件的轴向屈曲性能,设计了两种截面尺寸的点焊箱型紫铜构件,对其进行静力轴压试验.试验结果表明,两种构件发生屈曲时材料基本处于弹性状态,但两者存在差异,宽厚比的不同是造成结果差异的主要原因.在此基础上,采用有限元分析软件ABAQUS建立点焊箱型铜构件的有限元模型,与试验对比验证了有限元模型的可靠性.同时,对点焊边界条件下的薄板屈曲进行研究,得到焊点间距与屈曲系数之间的关系.最后,针对宽厚比和焊点间距两个参数,进行数值分析,得到宽厚比和焊点间距对点焊箱型构件受力性能的影响规律.     

Heteropoly acids of the Keggin type with N-substituted β-amminoethylphosphonic acids as coordinate center

Organophosphorus-heteropolytungstic acids of 1 : 12 of P/W ratio, with N-substituted 2-amminoethylphosphonic acids R2R'N+CH2CH2PO3H- (R = R' = H; R = Me, R' = H; R = R' = Me; R = H, R' = Me2CH; R = H , R' = CH3(CH2)2CH2) as coordinate centers were prepared, and characterized by means of elemental analysis, IR, UV spectroscopy, TG and DSC thermal analysis. The results indicate that these organophosphorous-HPAs possess Keggin type structure, and their stoichiometric formulation is R2R'N+CH2CH2PO3H - ·W12O36 ·nH2O. The organic side chain with the ammino-group R2R'N+CH2CH2- and the phosphono-group-PO3H- participate altogether in the formation of the primary structure of the heteropoly anion. In other words, the entirety of each compound R2R'N+CH2CH2PO3H- is as the core or coordinate center of the heteropoly anions. The number of crystal water in the HPA was affected obviously by the N-substituents of the organo-phosphonic acids.     

新型烷氧基修饰的手性SalenMn（Ⅲ）固载催化剂的合成及其在非功能化烯烃不对称环氧化反应中的应用

合成了一系列以有机聚合物-无机杂化材料聚（苯乙烯-苯乙烯基膦酸）-磷酸氢锆（ZPS-PVPA）为载体,烷氧基为连接基团的新型固载手性Salen Mn（III）催化剂,并运用FT-IR,UV-vis,XPS,SEM,TG,元素分析等手段对其进行了表征.以m-CPBA为氧化剂,茚和α-甲基苯乙烯为底物,考察了催化剂对非功能...     

关于算子谱性质幂有限秩摄动的一个注记

针对性质(v)和性质(gv)的摄动稳定性问题,通过研究性质(aw)与性质(gaw)的可交换幂有限秩摄动稳定性的相关结果,同时结合性质(aw)与性质(v)、性质(gaw)与性质(gv)之间的关系,为证明性质(v)和性质(gv)在可交换幂有限秩摄动下保持稳定提供了新的方法.     

CoAl_xCr_(2-x)O_4纳米颜料的共沉淀法制备及其性质

采用化学共沉淀法制备尖晶石结构的纳米颜料CoAlxCr2-xO4(x=0,0.4,0.8,…,2.0),实验所得颜料粒度均匀、粒径小、分散性好、颜色鲜亮.利用X射线衍射(XRD)确定了样品的相结构,并利用XRD谱信息对6种试样的晶格常数、晶粒度及密度进行了计算分析;采用TG-DTA,FT-IR以及SEM等测试技术研究了粉体的形成、形貌及粒径.