SO42-/ZrO2对萘齐聚反应的催化效应

详细考察了催化剂制备条件和反应条件对萘转化率的影响结果表明，催化剂的Ｌｅｗｉｓ酸强度是影响萘转化率的主要因素，酸量和反应条件对萘齐聚反应也有相当大的影响。与排 催化的萘高温缩聚反应相比，ＳＯ＾２－４／ＺｒＯ２催化下萘的齐聚反应具有很大的优越性。     

固体超强酸SO_4~(2-)/TiO_2对萘齐聚反应的催化作用

报道了使用固体超强酸催化剂ＳＯ２４／ＴｉＯ２对萘进行的齐聚反应。考察了不同制备条件如焙烧温度、硫酸浓度与催化活性之间的关系，同时研究了反应因素对收率的影响。实验表明，当硫酸浓度为０．５ｍｏｌ／Ｌ、焙烧温度在４５０～５００℃之间，催化剂的反应活性最高；延长反应时间、提高反应温度将有利于齐聚反应的进行；改变催化剂剂量也会影响齐聚反应。此外采用质谱分析方法对萘齐聚产物进行了分析，结果表明萘在ＳＯ２４／ＴｉＯ２的作用下生成的齐聚产物以二聚体为主，其分子量分布主要集中在二聚体到四聚体之间。     

NiSO_4／γ－Al_2O_3对低级烯烃齐聚反应的催化作用

用ＮａＯＨ和ＣＯ中毒法、ＥＳＲ检测等方法研究了ＮｉＳＯ４／γ－Ａｌ２Ｏ３催化剂上乙烯、丙烯和１－丁烯齐聚反应的催化作用．结果表明：催化剂的酸性对烯烃的齐聚反应起重要作用，并且反应活性主要与Ｈｏ－３．０的酸中心有关，乙烯二聚反应是通过配位催化进行的，其活性中心是Ｎｉ＋，丙烯齐聚是通过Ｎｉ＋上的配位催化和酸催化进行的，而１－丁烯齐聚则是通过酸催化机理进行     

新型固体酸催化剂SO42-/Fe2O3-ZrO2-SiO2的研究

研制了新型三元ＷＯ４＾２－／ＦｅｗＯ３－ＺｒＯ２－ＳｉＯ２固体酸催化剂并用于催化剂并用于催化乙酸／丁醇酯化反应;考察了制备方法、Ｆｅ,Ｚｒ摩尔比、Ｓｉ原子百分含量、沉淀ｐＨ值、陈化时间、预焙烧温度、浸渍液Ｈ２ＳＯ４溶液浓度、焙烧温度、焙烧气氛等对催化性能的影响。实验结果表明,使用Ｓｉ含量为２％,ｍｏｌＦｅ：ｍｏｌＺｒ＝０．２５由共沉淀－浸渍法在氧气气氛中制得的该类催化剂,乙酸的转化率、乙酸丁酯收率     

NiSO/r-Al2O3对低级烯烃齐聚反应的催化作用

用ＮａＯＨ和ＣＯ中毒法，ＥＳＲ检测等方法研究了ＮｉＳＯ４／ｒ－Ａｌ２Ｏ３催化剂上乙烯，丙烯和１－丁烯齐聚反应的催化作用。结果表明：催化剂的酸性对烯烃的齐聚反应起重要作用，并且反应活性主要与Ｈｏ≤－３．０的酸中心有关；乙烯二聚反应是通过配位催化进行的，其活性中心是Ｎｉ＋，丙烯聚是Ｎｉ＋上的配位催化和酸催化进行的，而１－丁烯齐聚则是通过酸催化机理进行。     

负载型杂多蓝HPB／SiO2的制备表征与催化性能的研究

用化学还原与共沉淀法制备了负载型杂多蓝催化剂Ｈ２ＰＷ６Ｍｏ５Ｍｏ＾ⅤＯ４０．２７Ｈ２Ｏ／ＳｉＯ２,并用ＩＣＰ,ＩＲ,吡啶吸附ＩＲ光谱及ＴＧ－ＤＴＡ等进行了表征。将该催化剂应用于乙酸丁酯的合成反应,结果表明,该催化剂有Ｂｒｏｅｎｓｔｅｄ酸位与Ｌｅｗｉｓ酸位和热稳定性,在最佳催化条件下,乙酸丁酯的收率可达９８．３％,醋酸的转化率大于９９％,并可重复使用１０次以上。     

SO4^2—／ZrO2—SiO2催化剂的制备及其对乙酸／丁醇酯化反应的催化作用

用０．５￣１．０ｍｏｌ／Ｌ Ｈ２ＳＯ４溶液处理ＺｒＯ２含量为３％￣５０％（摩尔分数）的锆硅复合氧化物，制得ＳＯ４＾２－／ＺｒＯ２－ＳｒＯ２催化剂。考察了催化剂对乙酸／丁醇酯化反应的催化作用及其制备条件（如：Ｚｒ／Ｓｉ比、沉淀剂、预焙烧温度、焙烧温度等）对催化剂性能的影响。实验结果表明，对于给定的反应，使用ＺｒＯ２含量约为１０％的ＳＯ４＾２－ＳｉＯ２催化剂时，乙酸的转化率高于９８％；而在相同条件下使     

固体超经酸SO^2—4／TiO2对萘齐聚反应的催化作用

报道了使用固体超强酸催化剂ＳＯ＾２－４／ＴｉＯ２对萘进行的齐聚反应。考察了不同制备条件如焙烧温度，硫酸浓度与催化活性之间的关系，同是研究了反应因素对收率的影响。实验表明，当硫酸浓度为０．５ｍｏｌ／Ｌ，焙烧温度在４５０－５００℃之间，经剂的反应活性最高。     

Ni系列催化剂上甲烷直接氧化制合成气

采用固定床流动反应装置，考察负载型Ｎｉ系列催化剂在甲烷直接氧化制合成气反应上的催化活性．空速为５．０×１０５ｈ－１，ＣＨ４／Ｏ２＝２条件下，不同Ｎｉ含量的催化剂中，１５％Ｎｉ／Ａｌ２Ｏ３活性较好．利用ＴＰＤ和ＸＲＤ技术将催化剂引发温度与催化剂组成进行关联，并在７００℃下考察空速对催化性能的影响．随着空速的增加，ＣＨ４的转化率增加，７．０×１０５ｈ－１时达到最大，与此同时，ＣＯ的选择性一直增加．实验结果说明在非平衡体系中，ＣＯ和Ｈ２是由ＣＨ４直接转化而来，ＣＯ２是ＣＯ深度氧化的产物，在此基础上对催化剂过程的机理作了初步的探讨．     

锰基催化剂上CO2加氢反应性能的研究

研究了Ｍｎ基催化上ＣＯ２的加氢反应性能，结果表明：ＣＯ２活化吸附量的增加有利于ＣＯ２转化率的提高。Ｍｎ具有较好的ＣＯ２加氢生成ＣＯ的催化活性，ＣｕＯ，Ｆｅ２Ｏ３的ＺｎＯ的加入使催化剂活性得到进一步的提高；ＮｉＯ的加入增加了催化剂的Ｈ２活化吸附量，从而使催化剂对ＣＨ４的选择性得到提高，同时使ＣＯ２的转化率与Ｎｉ／γ－Ａｌ２Ｏ３相比略有下降。     

Sc2MgGa2 and Y2MgGa2

Scandium magnesium gallide, Sc₂MgGa₂, and yttrium magnesium gallide, Y₂MgGa₂, were synthesized from the corresponding elements by heating under an argon atmosphere in an induction furnace. These intermetallic compounds crystallize in the tetragonal Mo₂FeB₂‐type structure. All three crystallographically unique atoms occupy special positions and the site symmetries of (Sc/Y, Ga) and Mg are m2m and 4/m, respectively. The coordinations around Sc/Y, Mg and Ga are pentagonal (Sc/Y), tetragonal (Mg) and triangular (Ga) prisms, with four (Mg) or three (Ga) additional capping atoms leading to the coordination numbers [10], [8+4] and [6+3], respectively. The crystal structure of Sc₂MgGa₂ was determined from single‐crystal diffraction intensities and the isostructural Y₂MgGa₂ was identified from powder diffraction data.     

Zur Kenntnis der Dialkalimetalldichalkogenide β-Na2S2, K2S2, α-Rb2S2, β-Rb2S2, K2Se2, Rb2Se2, α-K2Te2, β-K2Te2 und Rb2Te2

On Dialkali Metal Dichalcogenides β-Na₂S₂, K₂S₂, α-Rb₂S₂, β-Rb₂S₂, K₂Se₂, Rb₂Se₂, α-K₂Te₂, β-K₂Te₂ and Rb₂Te₂ The first presentation of pure samples of α- and β-Rb₂S₂, α- and β-K₂Te₂, and Rb₂Te₂ is described. Using single crystals of K₂S₂ and K₂Se₂, received by ammonothermal synthesis, the structure of the Na₂O₂ type and by using single crystals of β-Na₂S₂ and β-K₂Te₂ the Li₂O₂ type structure will be refined. By combined investigations with temperature-dependent Guinier-, neutron diffraction-, thermal analysis, and Raman-spectroscopy the nature of the monotropic phase transition from the Na₂O₂ type to the Li₂O₂ type will be explained by means of the examples α-/β-Na₂S₂ and α-/β-K₂Te₂. A further case of dimorphic condition as well as the monotropic phase transition of α- and β-Rb₂S₂ is presented. The existing areas of the structure fields of the dialkali metal dichalcogenides are limited by the model of the polar covalence.     

Crystal Structures of [Bu2Sn(O2PPh2)2], [Ph2Sn(O2PPh2)2], and [PhClSn(O2PPh2)OMe]2. Raman Spectra of [Ph2Sn(O2PPh2)2] and [PhClSn(O2PPh2)OMe]2

[(n‐Bu)₂Sn(O₂PPh₂)₂] ( 1 ), and [Ph₂Sn(O₂PPh₂)₂] ( 2 ) have been synthesized by the reactions of R₂SnCl₂ (R=n‐Bu, Ph) with HO₂PPh₂ in Methanol. From the reaction of Ph₂SnCl₂ with diphenylphosphinic acid a third product [PhClSn(O₂PPh₂)OMe]₂ ( 3 ) could be isolated. X‐ray diffraction studies show 1 to crystallize in the monoclinic space group P2₁/c with a = 1303.7(1) pm, b = 2286.9(2) pm, c = 1063.1(1) pm, β = 94.383(6)°, and Z = 4. 2 crystallizes triclinic in the space group , the cell parameters being a = 1293.2(2) pm, b = 1478.5(4) pm, c = 1507.2(3) pm, α = 98.86(3)°, β = 109.63(2)°, γ = 114.88(2)°, and Z = 2. Both compounds form arrays of eight‐membered rings (SnOPO)₂ linked at the tin atoms to form chains of infinite length. The dimer 3 consists of a like ring, in which the tin atoms are bridged by methoxo groups. It crystallizes triclinic in space group with a = 946.4(1) pm, b = 963.7(1) pm, c = 1174.2(1) pm, α = 82.495(6)°, β = 66.451(6)°, γ = 74.922(6)°, and Z = 1 for the dimer. The Raman spectra of 2 and 3 are given and discussed.     

Electrochemical study of (NEt4)2Cl2FeS2MoS2 and (NEt4)2Cl2FeS2MoS2FeCl2

Summary The ability of [MoS₄]^2–, anions to be used as ligands for transition metal ions has been widely demonstrated, especially with Fe²⁺. The present study has been restricted to linear complexes such as (NEt₄)₂ [Cl₂FeS₂MoS₂] and (NEt₄)₂[Cl₂FeS₂MoS₂FeCl₂]. Their electrochemical properties are described: upon electrochemical reduction, these compounds yield MoS₂, as a black precipitate, and an iron complex in solution, assumed to be [SFeCl₂]^2–. The electrochemical reduction goes through two electron transfers, coupled with the breakdown of the molecular skeleton: a DISPl and an ECE mechanism. Depending on the solvent, the following equilibrium may be observed: [Cl₄Fe₂MoS₄]^2–[Cl₂FeMoS₄]^2–+FeCl₂. The equilibrium constant, K_D, was evaluated by differential pulse polarography. K_D is tightly related to the donor number of the solvent.     

The alkali hypophosphites KH2PO2, RbH2PO2 and CsH2PO2

The structures of the hypophosphites KH₂PO₂ (potassium hypophosphite), RbH₂PO₂ (rubidium hypophosphite) and CsH₂PO₂ (caesium hypophosphite) have been determined by single‐crystal X‐ray diffraction. The structures consist of layers of alkali cations and hypophosphite anions, with the latter bridging four cations within the same layer. The Rb and Cs hypophosphites are isomorphous.     

Syntheses,Spectroscopic Studies,and Crystal Structures of Me2Sn(O2PPh2)2, Ph2Pb(O2PMe2)2, and Ph2Pb(O2PPh2)2

Me₂Sn(O₂PPh₂)₂ ( 1 ), Ph₂Pb(O₂PMe₂)₂ ( 2 ), and Ph₂Pb(O₂PPh₂)₂ ( 3 ) have been synthesized by the reactions of Me₂SnCl₂ or Ph₃PbCl with the corresponding diorganophosphinic acid in methanol. X‐ray diffraction studies show that the diorganophosphinate groups behave as double bridges between the metal atoms leading to polymeric ring‐chain structures with M₂O₄P₂ (M = Pb, Sn) eight‐membered rings. The organic groups bonded to the metal atoms are in trans‐position in the resulting octahedral arrangement around the metal atoms. The IR and the mass spectra were reported and discussed.     

Thermal decomposition of Me3SnO2PCl2, Me2Sn(O2PCl2)2 and Ph3SnO2PCl2

TG and DTA studies on Me₃SnO₂PCl₂, Me₂Sn(O₂PCl₂)₂ and Ph₃SnO₂PCl₂ were carried out under dynamic argon atmosphere. The results show that the decomposition proceeds in different stages leading to the formation of Sn₃(PO₄)₂ as a stable product. This compound was characterized by IR spectroscopy. Decomposition schemes involving reductive elimination reactions were proposed.