单元系T—p相图的数学结构

作者以化学元素的稳定单质为基准,推演出了任意物质M_i(相态Ω)的热力学生成活度{相态Ω)的函数形式:?D_Ω数值的大小体现着相态Ω的热力学相对稳定性.根据集合论原理沿D(稳定性)座标取极大值的方法把物理性质互不连续的各个异相态连结在一起,建立了单元系在T-p面上的优势分布方程(PSDE):■作者以H_2O为实例,计算了T-p相图,与实验相图基本一致.     

钛对耐硫变换催化剂性能的影响

利用常压微反色谱、程序升温还原（ＴＰＲ）等技术研究了钛对耐硫变换催化剂性能的影响，结果表明：（１）钛能明显提高耐硫变换催化剂的活性，尤其是在低于６２３Ｋ时活性提高最为明显；（２）工业侧流试验后，含钛样品的保留活性及活性保留率均高于Ｋ８－１１；（３）催化剂中添加助剂ＴｉＯ２后，能显著提高对原料气中Ｈ２Ｓ含量变化的适应能力，因此可以拓宽对原料气的选择范围，对工业生产有着十分重要的现实意义。     

Investigation of the Interaction of Sodium Chloride and Two Amino Sulfonic Acids,HEPES and MOPSO,by EMF Measurements

Ionic interactions in the two systems NaCl-HEPES (N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid) and NaCl-MOPSO (3-(N-Morpholino)-2-hydroxypropanesulfonic acid) have been studied in terms of their mutual influence on the respective activity coefficients of each component. Activity coefficients for each component of the two systems and for corresponding buffers are calculated from emf measurements of solutions containing NaCl, the aminosulfonic acid, and its conjugate base in a NalSE/solution/AgCl-Ag cell at 5, 15, 25, and 37 °C.     

一种新型有机锗化合物的合成及其抗癌性

癌症是当今人类疾病中的第一杀手,寻找新的药物预防和医治癌症是21世纪有机化学的重要研究课题之一。本文报道了一种新型有机锗化合物的合成,它对肺腺癌细胞生长抑制率达88%。     

淀粉液化液灭酶方法的研究

某些情况下淀粉液化液需要严格控制液化的程度 ,因此需要及时终止残余淀粉酶的活性。实验用降低液化液 pH值、升高温度、以及两者并用等 3种方法结束液化反应过程 ,实验结果可作为工业生产过程参考。     

溶剂对溶胶-凝胶法制备LaMnFe2Al9O19催化剂的影响

摘要 用溶胶凝胶法制备六铝酸盐催化剂LaMnFe2Al9O19，通过BET、XPS、XRD等技术，对催化剂的结构和性质进行了研究，主要考察了在制备过程中不同的醇做溶剂对催化剂结构及其甲烷催化燃烧活性的影响。结果表明：不同醇做溶剂所制备的催化剂LaMnFe2Al9O19 在1200℃焙烧后都可以形成完整的六铝酸盐晶型，且具有较高高温稳定性。同时对于催化剂的的催化性能也有较大的影响，用异丙醇做溶剂所得催化剂的催化活性最高，并保持了较大的比表面积。     

Ziegler-Natta烯烃聚合催化剂进展

综述了Ziegler-Natta催化剂在乙烯聚合和丙烯聚合方面的研究开发现状，重点介绍了采用新型二醚化合物作为内给电子体的丙烯聚合催化剂的进展。随着合成树脂向功能化方向发展，开发综合性能优越的新型催化剂及给电子体将是今后的研究方向。     

Synthesis and activation of Pt nanoparticles with controlled size for fuel cell electrocatalysts

Well-dispersed Pt nanoparticles with controlled size and narrow size distribution were prepared by polyalcohol reduction of platinum acetylacetonate, using oleylamine as a capping agent. The particle size was varied from 3.5 nm to 11.5 nm by decreasing the amount of oleylamine added in the synthesis. Size selection of the as-prepared particles by solvent fractionation yielded nearly monodispersed Pt particles. The as-prepared particles were loaded on a carbon support by physical deposition, but showed no electrocatalytic activity due to the oleylamine bound to the particle surface. The particles were activated for electrocatalysis after heating the particles in air at 185 °C for 5 h, conditions that gave no particle-sintering and no oxidation. Cyclic voltammetry showed that the particles after the heat treatment in air were electrocatalytically active for methanol oxidation. The smaller 3.5 nm and 4.0 nm Pt particles had a higher intrinsic activity for methanol oxidation, but a lower tolerance to CO poisoning, compared with 6.0 nm, 9.5 nm and 11.5 nm particles. CO-stripping results suggest that CO is more easily oxidized on larger Pt particles.     

胍基聚合物的合成及抗菌性能

采用熔融缩聚的方法合成了聚亚己基胍盐酸盐（PHGC）及聚亚己基双胍盐酸盐（PHBG）。应用气相渗透压法（VPO）及粘度法测定了其分子质量，应用元素分析，FT－IR，XPS分析了聚合物的化学组成，抗菌活性的研究结果表明所合成的胍基聚合物具有较强的而且广谱的抗菌性能。     

Chirality-antimicrobial relationship of quaternary ammonium cationics

Optically active and racemic quaternary ammonium cationics containing a chiral alkyl group, such as N,N-dimethyl-N-(1-phenylethyl)alkylammonium bromides were prepared and showed excellent antimicrobial properties against Gram positive and negative bacteria, with some exceptions, and against fungi. The influence of optical isomerism on their antimicrobial properties showed that the antimicrobial properties between racemic and optically active cationics were obscure. The order of activity of substituted alkyl groups was tetradecyl > dodecyl ° hexadecyl.