共查询到20条相似文献,搜索用时 62 毫秒
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固相配位化学反应研究:LXVII.金属铜表面M—S(M=Mo,W)簇合物的组成 总被引:2,自引:0,他引:2
采用FTIR、XPS和AES研究了金属铜表面M-S(M=Mo,W)簇合物膜。结果表明,Mo(W)S^2-4与铜表面的Cu2O反应,形成了Mo(W)-S-Cu键。簇合物膜由Mo(W),S,Cu,O元素组成,分别呈+6、-2、+1、-2价,膜为多分子层结构并保持,MoS4或WS2单元,膜表面只有Cu,O而不存在Mo(W),S,膜层厚度与反应时间有关,时间越长,膜越厚,膜为多组分的复杂体系,其颜色是各组 相似文献
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簇合物SFeCo_2(CO)_9的合成方法研究赵转云,武和平,殷元骐(中国科学院兰州化学物理研究所兰州730000)SFeCo_2(CO)_9是一四面体构型的潜手性簇合物,由此为前体,合成簇合物SFeCoM(CO)_x(M=Cr,Mo,W,Rh,Ru... 相似文献
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Co—Mo/Al2O3型重整预加氢催化剂的研制 总被引:3,自引:0,他引:3
考察了不同方法制备的Co-Mo/Al2O3型重整预加氢催化剂对石油加氢脱硫活性的影响,选出了一种工业生产步骤简单,金属含量容易控制,并且不腐蚀设备的碱必等量共浸法制备的DS-948催化剂。该催化剂在温度350℃,压力3.0MPa,液体空速6.0h^-1,体积氢油比70的条件下,满足了双金属重整催化剂对精制石油脑油杂质含量的要求。 相似文献
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三核钼-硫簇合物的低热固相合成及其晶体结构 总被引:1,自引:0,他引:1
三核钼-硫配合物Mo_3S_7(dtc)_3I·S_8·2CH_2Cl_2(dtc=C_4H_8NCS_2~-)是由低热固相合成得到的。晶体属单斜晶系,M_r=1500.19,空间群P2_1/n,a=11.881(3),b=15.559(4),c=26.197(7),β=98.53(2)°,V=4789A~3,Z=4,D_c=2.08g/cm~3,F(000)=2920,μ(MoKα)=25.24cm~(-1),对于2397个I≥3σ(I)的独立衍射点,最终偏离因子R=0.060,R=0.066。该配合物的基本骨架是[Mo_3S_7(dtc)_3]~+,其簇芯为[Mo_3S_7]~(4+)单元,3中Mo原子组成正三角形平面,Mo-Mo的平均键长力2.723,Mo原子平面上的硫原子形成盖帽的μ_3-S,其Mo-S平均键长为2.383A,3个S_2基团分别位于三角形3个棱的外侧,并分别与邻近的两个Mo原子结合形成12中Mo-S键。与μ_3-S相对而位于平面另一侧的Ⅰ原子与3个μ_2-S连结,平均距离为3.257A,成键作用较弱。 相似文献
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合成了四个三核簇合物[A]2[MS4(CuCN)2](1A=Et4N,M=Mo;2A=PPh4,M=W;3A=Et4N,M=W;4A=PPh4,M=Mo),测定了[Et4N]2[MoS4(CuCN)2]*H2O(1*H2O)和[PPh4]2[WS4(CuCN)2]*0.5DMF*H2O(2*0.5DMF*H2O)的晶体结构.1和2的簇阴离子[MS4(CuCN)2]2-(M=Mo,W)均具有一个双齿配体MS42-和两个CuCN形成的近似D2d对称性结构. 相似文献
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具有Ru-M (M=Fe, Co, Ni, Mo)双金属活性中心的负载型氨合成催化剂 总被引:1,自引:0,他引:1
研究了钾促进的双金属中心Ru-M (M=Fe, Co, Ni, Mo)氨合成催化剂.结果表明, Ru-Co催化剂活性最高, Ru和Co含量均为2%的Ru-Co催化剂具有最好的应用价值,其催化活性与Ru和Co含量均为4%的催化剂相近. 此外,还对以镁铝尖晶石、氧化镁和镁铝复合氧化物等不同氧化物为载体的Ru-Co双金属中心催化剂进行了对比研究. 结果表明,以高温煅烧制得的氧化镁作载体的催化剂活性最高. 相似文献
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《Journal of Coordination Chemistry》2012,65(4):339-346
Abstract The reaction of (μ3-S)RuCo2(CO)9 with functionally substituted cyclopentadienyl tricarbonyl metal anions M(CO)3(C5H4C(O)R) (M = Mo, W; R = OEt, CH2CH2COOMe) in THF under reflux gave new chiral skeleton clusters (μ3-S)RuCoM(CO)8(C5H4C(O)R) [M = Mo, R = OEt (1); M = W, R = OEt (2); M = Mo, R = CH2CH2COOMe (3); M = W, R = CH2CH2COOMe (4)]. These complexes were characterized by elemental analysis, IR and 1H NMR spectra. The molecular structure of compound (1) was determined by single-crystal X-ray diffraction methods. 相似文献
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M(Fe,CO,Ni)ZrO2气凝胶超细粒子催化剂织构和结构热稳定性的研究 总被引:4,自引:0,他引:4
用超临界流体干燥(SCFD)法制备出高比表面纳米级ZrO2和M(Fe,Co,Ni)/ZrO2气凝胶超细原粉.详细考察了其在空气中450℃焙烧后织构和结构的变化,表明ZrO2气凝胶原粉织构和结构的热稳定性较差,而添加铁、钴、镍的M/ZrO2气凝胶原粉织构和结构的热稳定性明显增强,稳定作用依钴、镍、铁次序增加.焙烧后所得的M/ZrO2气凝胶超细催化剂颗粒增长不大,颗粒间仍较大程度地保持着原有凝胶三维网络织构状态.与常规法制备的催化剂相比,其比表面积和孔体积高出甚多. 相似文献
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Reaction of [Et4N]2[Mo2S2(μ-S)2(edt)2] with CoCl2(6H2O and Phen in MeCN followed by recrystallization in DMSO/Et2O gave rise to dark-red block crystals of {[Co(Phen)3]- [Mo2S2(μ-S)2(edt)2]}2·(DMSO)2·(Et2O) 1 (C88H86Co2Mo4N12O3S18). 1 crystallizes in the monoclinic system, space group P21/c with a = 24.631(4), b = 16.117(3), c = 24.791(4) (A), β = 92.835°, V = 9829.3(3) (A)3, Z = 4, Mr = 2438.57, Dc = 1.648 g/cm3, F(000) = 4928, μ = 12.61 cm-1, R = 0.0936 and wR = 0.1682 for 12998 observed reflections with I > 2.0σ(I). In the structure of 1, the Co atom of the [Co(Phen)3]2+ dication is octahedrally coordinated by three Phen ligands. The Mo atom of the [Mo2S2(μ-S)2(edt)2]2- dianion is coordinated by two μ-S, one terminal S and two S atoms from edt, forming a distorted square pyramidal geometry. The mean Co-N and Mo…Mo bond distances are 2.139 and 2.872 (A), respectively. 相似文献
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M. I. Sykhrannova S. Ya. Khorshev A. N. Tatarnikov E. N. Gladyshev 《Russian Chemical Bulletin》1994,43(8):1405-1407
Based on the dependences v(CO) =a + b* for IR spectra of carbonyi complexes of transition metals, the inductive constants of the organometallic fragments M(CO)
m
Cp
n
and HgM(CO)
m
Cp
n
(M = Co, Mo, Mn, Fe, Re) have been determined. The acceptor properties of the organometallic fragments have been shown to change according to the order of the nucleophilicity of the anions: Fe(CO)2Cp > Re(CO)5 > Mn(CO)5 > Mo(CO)3Cp > Co(CO)4.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1482–1484, August, 1994. 相似文献
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水热合成并通过红外、热重、单晶X-射线衍射表征了一个新颖镍配位阳离子修饰的还原型钼磷酸盐,Ni[Mo6O12(OH)3(PO4)(HPO4)3]2][Ni(H2O)2][Ni(H2O)(bipy)2]4·5H2O。单晶X-射线衍射研究表明,两个{Mo6P4}簇单元通过一个镍离子连接形成一个Ni[Mo6P4]2二聚结构单元,其进一步和其他的镍配位阳离子连接成钼磷酸盐一维链状结构。在H2O2存在下的液-固体系中,使用该化合物催化氧化苯甲醛的探针反应结果表明,该化合物具有较高的催化氧化活性。 相似文献
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热处理对Co(Ni)-Mo/Al2O3催化剂加氢脱硫活性的影响 总被引:9,自引:0,他引:9
介绍了硫化Co-Mo/Al2O3催化剂的热处理方法及其结果。实验表明,硫化催化剂经热处理后,加氢脱硫活性明显增加,以塞吩转化率表示的催化活性随处理温度升高而变化,在450℃时观察到催化活性的极大值。 相似文献
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We have investigated the reaction mechanism for N2 O decomposition on Cu13 via density functional theory. It is found that N2 O decomposition on the cluster is more prone to be along the Eley-Rideal(ER) pathway in comparison with the Langmuir-Hinshelwood(LH) channel. There exists structural relaxation for Cu13 cluster in the reaction, which may influence the catalytic activity of cluster for the subsequent N2 O decomposition. The core atom in the Cu13 cluster is substituted with the Fe, Co, or Ni to enhance structural stability and prevent from the obvious configuration relaxation in the reaction. Note that these bimetallic clusters are of icosahedra as the Cu13. They have activities for N2 O dissociation along ER pathway and the heteroatom in the cluster can prevent configuration from relaxation. Finally, the Ni@Cu12 cluster can be as a superior catalyst in a complete catalytic cycle via comparison in this study. 相似文献
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