负载Pt,Pd催化剂上NO—TPD和NO催化还原性能

负载Ｐｔ、Ｐｄ催化剂上ＮＯ－ＴＰＤ和ＮＯ催化还原性能１）钟依均（浙江师范大学化学系金华３２１００４）罗孟飞周碧袁贤鑫（杭州大学催化研究所杭州３１００２８）关键词负载Ｐｔ、Ｐｄ催化剂ＮＯ－ＴＰＤＣＯ－ＮＯ反应分类号Ｏ６４３．３２氮氧化物（ＮＯｘ）污染是...     

Cu-Mg/Al复合氧化物催化碳颗粒物燃烧性能的研究

恒定二价与三价阳离子比为3(nM2+/nM3+=3),采用共沉淀法制备不同Cu含量的系列水滑石前驱物, 800 ℃焙烧4 h形成复合氧化物(CuO质量百分数分别为0％、5％、10％、15％、20％、30％、40％)用作柴油车排放碳颗粒物燃烧的催化剂,并采用XRD、BET、TG-DSC、FT-IR、TPR等表征手段研究了Cu、Mg含量对材料前驱物物化性能的影响及对其衍生复合氧化物催化碳颗粒物燃烧性能的影响．结果表明,Cu、Mg含量对材料的热稳定性、比表面和催化氧化活性有显著的影响. Mg有助于提高催化剂的热稳定性; Cu含量增加,催化剂比表面下降,但比表面不是影响催化剂活性的主要因素. CuO含量为15％时,催化剂具有最好的催化活性和稳定性,碳颗粒物的起燃温度(T10)和半转化温度(T50)分别为336 ℃和409 ℃.在CuO含量≤30％时可以形成结构完整的水滑石前驱物, CuO含量为40％时出现Cu(OH)2杂相; CuO含量< 20％时,经高温焙烧可得到均匀的复合氧化物, CuO含量≥20％时出现CuO偏析． TPR结果表明焙烧温度和复合氧化物的组成决定了材料的可还原性能．     

脂肪酸加氢改性Ni及Ni-Pd催化剂的制备

工业动植物油脚的主要成分为不饱和脂肪酸,通过催化加氢制得的硬脂酸[1,2],可作橡胶添加剂。但不饱和脂肪酸的酸值较高,易使镍催化剂皂化中毒而失活。本文在镍催化剂的基础上,加入微量的过渡或碱士等活泼金属作助剂,提高催化剂的抗皂化性能;加入微量钯,提高催化剂的活性,采用沉淀法,以硅藻土为载体,制备了负载型改性Ni及Ni Pd催化剂。并与国内化工企业常用的棕榈酸(酸值为188 6mgKOH/g)进口加氢催化剂USA 140和USA 110在相同条件下对进行对比。1　实验部分1 1　催化剂制备将18gNi(NO3)2:6H2O溶于130ml水,再依次加入一定配比的过…     

Molecular Recognition of Bases and Nucleosides by Mono－substituted Mononuclear Complexes of 1,4,7,10－Tetraaza－cyclododecane

The mononuclear macrocyclic polyamine metal complexes 5a-5e have been shown to form stable 1 : 1 complexes with bases and nucleosides. Their binding constants (K) were determined by UV-visible spectrometric titration. The results show that recognition ability of the complexes 5a--5e for uracil, U (Uridine), dT (Thymidine) is higher than that for the other bases or nucleosides (such as Cytidine, Guanosine, Adenosine). The metal ion also plays an important role for the recognition ability of complexes.     

SYNTHESIS AND MOLECULAR STRUCTURE OF Co（Ph2pyPO—N,O）2Cl2[Ph2pyPO=DIPHENYL（2—PYRIDYL）PHOSPHINE OXIDE]

<正> Complex Co(Ph2pyPO-N,O)2Cl2 was synthesized and its crystal and molecular structure was determined. Crystal data: Co(Ph2C5H5NPO-N,O)2Cl2, Mr = 688.4, monoclinic, space group A 2/a, a = 13.085(2), b = 11.134(3), c = 21.769(4)A,β=102.29(1)°,Z = 4, V = 3098.6 A3, DC = 1.476 g/cm3, final R= 0.049 and Rw=0.057 for 2804 independent reflections. The cobalt atom in the title molecules is coordinated by two chlorine atoms and two nitrogen and two oxygen atoms from the two phosphine oxide ligands, forming a distorted octahedron.     

金(Ⅲ)与某些中性氧配体(RnXO)形成的配合物及其表征

合成了金(Ⅲ)与七种中性氧配体RnXO(R=辛基或苯基;X=N,P,As和S;n=2,3)形成的十种配合物,可概括为两种类型:H(RnXO)x·AuCl_4·Sy(RnXO=TONO、TOPO、TPPO、DOSO、DPSO、TPAsO和bipyO_2;S=乙醇或水;x=1,2,3,y=0,1,2或3)和[Au(L)X_2](L=bipyO_2;X=Cl或Br)。用元素分析、摩尔电导、紫外和红外光谱、核磁共振和热重分析等方法测定了它们的组成和性质,并对其可能的结构也进行了讨论。     

一维链状配位聚合物[Cd(N-MeIM)2(SCN)2]n的结构表征和电化学性能研究(英)

A novel cadmium(Ⅱ) isothiocyanate complex [Cd(N-MeIM)₂(SCN)₂]_n(N-MeIM=N-methylimidazole) has been prepared and characterized by spectroscopic analysis and crystallographic method. The title compound crystallize in the Triclinic system, space group P1, with lattice parameters a=0.589 50(12) nm, b=0.785 70(16) nm, c=0.882 00(18) nm, α=110.98(3)°, β=106.49(3)°, γ=95.08(3)°, and Z=1. The title compound exhibits an infinite chain structure in which each pair of Cd atoms is bridged by two η-1,3-SCN^- groups. The unique Cd atom lies on an inversion centre and the coordination sphere is completed by two N-MeIM N atoms to form a CdS₂N₄ octahedron. The polymeric chains are further extended into three-dimensional network via π…π stackings interactions between the imidazole rings. The cyclic voltammetry behaviors of the compound on glass carbon electrode showed a typical irreversible process. CCDC: 265283.     

用草酸胍制备钴酸盐尖晶石

本文采用先驱物法合成钴酸盐尖晶石MCo₂O₄(M=Zn,Ni,Cu,Mg,Cd,Mn)。以草酸胍作为沉淀剂，在溶液中以共沉淀的方法合成草酸盐先驱物。采用热分析(TG和DTA)、化学元素分析、红外光谱等手段对先驱物进行分析表征。通过红外光谱、X射线粉末衍射、扫描电镜对产物进行表征。产物的平均粒度范围在3.5～8.8 μm之间。     

三唑螯合树脂AMTR和AHMTR对Pd（Ⅱ）,Pt（Ⅳ）的吸附性能研究

使用含４－氨基－３，５－二甲基－１，２，４－三唑和４－氨基－３，５－二羟甲基－１，２，４－三唑功能基的三唑螯合树脂的ＡＭＴＲ和ＡＨＭＴＲ，研究了时间、酸度、金属离子浓度及树脂结构等对树脂吸附Ｐｄ（Ⅱ）和Ｐｔ（Ⅳ）的吸附能力，吸附速度及洗性能的影响，结果表明，两种树脂对Ｐｄ（Ⅱ）和Ｐｔ（Ⅳ）均表现出良好的吸附选择性，并且ＡＭＴＲ树脂的吸附性能优于ＡＨＭＴ树脂。     

Synthesis and Crystal Structure of Ag2（admtrz）2（CF3CO2）2（admtrz=4—amino—3,5—dimethyl—1,2,4—triazole）

1 INTRODUCTION Transition metal complexes bridged by 1, 2, 4-triazole group can produce interesting structures and specific properties[1]. Many attempts have been made to synthesize a variety of complexes with paramagnetic centers by using such ligands, and their structures and magnetic properties have been characterized[2]. However, the polynuclear Ag(I) complexes bridged by 1, 2, 4-triazole have been poorly studied[3]. Recently, we have prepared a series of silver(I) triazole complex…