TMAOH—P2O5—Al2O3—SiO2—H2O—HF体系分子筛的合成研究

以H_3PO_4、水铝石和硅溶胶为原料,四甲基氢氧化铵(TMAOH)为模板剂,在HF参与下水热晶化出含磷P型沸石和SAPO-20分子筛,得到2种分子筛的生成相区,并用~(31)P和~(29)Si MASNMR方法研究了杂原子的取代方式。     

H2SiW12O40—La2O3／γ—Al2O3催化甲醇脱水制备二甲醚

用浸渍法制备了负载型复合杂多酸催化剂H2Si12O40-La2O3/γ-Al2O3,用于甲醇脱水制备二甲醚,用N2吸附、吡啶吸附外光谱、NH3－TPD、XRD光谱等手段对催化剂进行了表征,考察了杂多酸负载量、浸渍时间、反应温度、质量空速等因素对催化活性的影响。实验结果表明,催化剂中H2SiW12O40负载量为10％－16％时催化剂的活性最好,在常压下反应温度为300℃,质量空速为1．6h^-1时,甲醇转化率达85％,二甲醚的选择性为99．9％,加压可提高催化剂的活性。     

Structure of (C3H5NH3)2H2P2O7·H2O

The bis(cyclopropylammonium)dihydrogenodiphosphate monohydrate is a new diphosphate associated with the organic molecule C₃H₅NH₂. We report the chemical preparation and the crystal structure of this organic cation diphosphate. (C₃H₅NH₃)₂H₂P₂O₇.H₂O is orthorhombic (S.G. : P2₁2₁2₁), with Z = 4 and the following unit-cell parameters : a = 4.828(1) Å, b = 11.011(1) Å, c = 25.645(2) Å. The P₂O₇ groups and H₂O water molecules form a succession of bidimensional layers perpendicular to the c axis. The organic cations ensure the three-dimensional cohesion by NH-O hydrogen bonds.     

Al2O3·3H2O阻燃环氧树脂机理探讨

采用氧指数测定法与热重法研究了Al2O3·3H2O对环氧树脂固化物的阻燃效果与机理.结果表明,Al2O3·3H2O在热分解方面与树脂固化物有阻燃匹配性,并能以零级反应快速失去2个结晶水分子,失水后形成的活性氧化铝促进了树脂固化物热解时转化成难燃物的能力,具有较高的阻燃效果.     

Bromination of alkenols with the H2O2—LiBr—CeIII and H2O2—LiBr—CeIV systems

Reactions of alkenols with H₂O₂??LiBr??Ce(NO₃)₃·6H₂O or H₂O₂??LiBr??Ce(NH₄)₂(NO₃)₆ system led to bromination of the double bond to yield vicinal dibromoalkanols. The reaction proceeded highly selectively, no oxidation of the hydroxyl group virtually occurred.     

O(3P)+O2H——OH+O2反应机理的密度泛函理论研究

用密度泛函理论方法研究了O(³P)与O₂H反应生成羟基和氧分子的反应机理.在PW91/6-31+G^*水平上用梯度解析技术全自由度优化上述反应物、产物和反应路径上的中间体及过渡态几何构型,并通过频率振动分析加以确认,计算IRC反应路径及中间体异构化过程,确定了此反应的可能反应通道.结果表明:该反应是多通道多步骤的强放热反应.首先形成顺式或反式O₃H富能中间体,此过程无能垒;然后跨过一个能垒分解成产物OH和O₂.通道IM1→TS1比IM2→TS2克服的能垒要大,反应放热372.822kJ.mol^-1.IM1TS3IM2可相互转化.     

负载型Fe2O3—La2O3—γ—Al2O3的XRD与MBS表征

对负载型Ｆｅ２Ｏ３－Ｌａ２Ｏ３－γ－Ａｌ２Ｏ３的ＸＲＤ，ＭＢＳ等方法的研究表明，Ｌａ２Ｏ３对γ－Ａｌ２Ｏ３的改性、提高了载体的热稳定性，增强了活性组份同载体的相互作用，提高了活性组份在载体表面的分散能力。     

三元体系La（NO3）3—Gly—H2O的研究

测定了三元体系Ｌａ（ＮＯ３）３－ＧｌｙＨ２Ｏ在２５℃时的溶度和饱和溶液的折光指数。报道了三元体系中生成的三元配合物：Ｌａ（Ｇｌｙ）２（ＮＯ３）３．２Ｈ２Ｏ和Ｌａ（Ｇｌｙ）４（ＮＯ３）３．Ｈ２Ｏ。用熔点、红外光谱及热分析测定了各配合物的一些物理化学性质。     

MgO—MgCl2—H2O溶液热化学研究

用精密量热仪对模拟合成的ＭｇＯ－２７．５６％ＭｇＣｌ－Ｈ２Ｏ浓盐溶液进行恒沸盐酸－△Ｈ滴定。发现活性ＭｇＯ在２７．５６％ＭｇＣｌ－Ｈ２Ｏ溶液中不同浓度时表现出不同的结果。结合该浓盐溶液的恒混盐酸－ＰＨ滴定结果对反应机制进行了初步探讨。     

Thermodynamic properties of two zinc borates: 3ZnO·3B2O3·3.5H2O and 6ZnO·5B2O3·3H2O

Two pure zinc borates with microporous structure 3ZnO·3B₂O₃·3.5H₂O and 6ZnO·5B₂O₃·3H₂O have been synthesized and characterized by XRD, FT-IR, TG techniques and chemical analysis. The molar enthalpies of solution of 3ZnO·3B₂O₃·3.5H₂O(s) and 6ZnO·5B₂O₃·3H₂O(s) in 1 mol · dm⁻³ HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of ZnO(s) in the mixture solvent of 2.00 cm³ of 1 mol · dm⁻³ HCl(aq) in which 5.30 mg of H₃BO₃ were added were also measured. With the incorporation of the previously determined enthalpy of solution of H₃BO₃(s) in 1 mol · dm⁻³ HCl(aq), together with the use of the standard molar enthalpies of formation for ZnO(s), H₃BO₃(s), and H₂O(l), the standard molar enthalpies of formation of −(6115.3 ± 5.0) kJ · mol⁻¹ for 3ZnO·3B₂O₃·3.5H₂O and −(9606.6 ± 8.5) kJ · mol⁻¹ for 6ZnO·5B₂O₃·3H₂O at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles.     

UNIFAC方程用于H2O—n—C12H26—D2EHPA—LaCl3—HCl萃取体系

本文实验测定了n-C_(12)H_(26)-D_2EHPA在盐酸介质中萃取La~(3+)的平衡数据和H_2O-n-C_(12)H_(26)D_2EHPA体系的活度系数.用Pitzer方程计算水相中H_2O和H~+、La~(3+)的活度系数,用UNIFAC方程计算有机相各组分的活度系数,提出了萃取剂和金属萃合物的基因划分方法,经数据拟合,获得了能在全浓度范围内适用的萃取反应平衡常数和UNIFAC参数,用这些参数成功计算了n-C_(12)H_(26)-D_2EHPA萃取La~(3+)的平衡浓度.     

Synthesis and Crystal Structure of （H3O）2[Cu3Cl3（H2O）3（NC9H12.5O6）2]

1 INTRODUCTION The polydentate ligand nitrilotripropionic acid, H3ntp[N(CH2CH2COOH)3], has attracted conside- rable research interest in constructing coordination polymers, designing organic-inorganic hybrid mate- rials[1], synthesizing supramolecular compounds[2], etc. due to its high degree of flexibility with three carboxylic acid moieties allowing for a variety of coordination through oxygen atoms[3]. It also pro- vides other versatile properties such as the possibili- ty of inter-…     

Two binuclear complexes containing the enrofloxacinate anion: Cd2(C19H21N3O3F)4(H2O)2 · 4H2O and Pb2(C19H21N3O3F)4 · 4H2O

The syntheses and crystal structures of the closely related but non-isostructural Cd₂(C₁₉H₂₁N₃O₃F)₄(H₂O)₂?·?4H₂O (1) and Pb₂(C₁₉H₂₁N₃O₃F)₄?·?4H₂O (2) are described, where C₁₉H₂₁N₃O₃F^? is enrofloxacinate (enro). Both compounds contain centrosymmetric, binuclear, neutral complexes incorporating a central diamond-shaped M₂O₂ (M?=?Cd, Pb) structural unit. The Cd²⁺ coordination polyhedron in 1 is a CdO₆ trigonal prism, including one coordinated water. The Pb²⁺ coordination polyhedron in 2 can be described as a very distorted square-based PbO₅ pyramid, although two additional short Pb?···?O (<3.1?Å) contacts are also present. In the crystal of the cadmium complex, O–H?···?O hydrogen bonds lead to a layered structure. In the lead compound, O–H?···?O and O–H?···?N interactions lead to chains in the crystal. Crystal data: 1: C₇₆H₉₆Cd₂F₄N₁₂O₁₈, M _r?=?1766.45, triclinic, P 1, a?=?12.185(2)?Å, b?=?12.306(3)?Å, c?=?14.826(3)?Å, α?=?68.15(3)°, β?=?70.28(3)°, γ?=?86.11(3)°, V?=?1938.2(7)?ų, Z?=?1, T?=?298 K, R(F)?=?0.030, wR(F ²)?=?0.079. 2: C₇₆H₈₈F₄N₁₂O₁₆Pb₂, M _r?=?1920.00, triclinic, P 1, a?=?12.0283(4)?Å, b?=?12.7465(4)?Å, c?=?13.0585(4)?Å, α?=?83.751(1)°, β?=?74.635(1)°, γ?=?81.502(1)°, V?=?1904.3(1)?ų, Z?=?1, T?=?298?K, R(F)?=?0.021, wR(F ²)?=?0.049.     

Fe2O3/CNT催化湿法H2O2氧化苯酚

通过化学沉积法和热处理得到多壁碳纳米管负载Fe2O3催化剂 Fe2O3/CNT, Fe2O3的负载质量分数约为15.1%,XRD表征显示,负载的Fe2O3存在α和γ这2种晶型。考察了Fe2O3/CNT催化湿式H2O2氧化去除废水中苯酚催化性能,通过苯酚的去除率及反应过程中催化剂活性组分的溶出总量,研究了催化剂制备过程中添加聚乙烯醇对催化剂性能的影响。在苯酚和H2O2初始浓度分别为350和1 500 mg/L、催化剂投加量为1.0 g/L、温度80 ℃条件下,经过240 min的反应,苯酚去除率达100％,COD去除率为86.1％。     

丙酮—H2O2—ClO^—化学发光反应的研究

化学发光是指由于某一化学反应而导致的一种光辐射。丙酮是一种常用的有机试剂。本文首次报道了丙酮-H_2O_2-ClO~-体系的化学发光反应,对反应试剂浓度的影响,金属离子和卤素离子的催化作用及有机物的影响进行了实     

HCl-NaCl-C3H8O3-H2O体系溶液热力学性质

在恒定丙三醇质量分数x=0．1的条件下，测定了无液接电池（A）和电池（B）的电动势根据电池（A）电动势确定了丙三醇和水混合溶剂中的Ag－AgCl电极的标准电极电势，讨论了HCl的迁移性质；由电池（B）测得的电动势计算了HCl在该体系中的活度系数γA，计算的结果表明，对于所讨论的体系，在溶液中总离子强度保持恒定，HCl的活度系数服从Harned规则．在溶液组成恒定时，IgγA是温度倒数1／T的线性函数，讨论了混合物中HCl的相对偏摩尔焓及介质效应．     

Bi2O3—Y2O3系阻抗谱研究

本文用交流阻抗法研究了Bi_2O_3-Y_2O_3系的阻抗谱。呈现特有的Warburg阻抗及其相关阻抗。在高氧分压下,电极过程由氧原子在三相线发生反应后直接进入电解质步骤控制;低氧分压下,由上述步骤和界面浓差极化共同控制,或仅由浓差极化控制。在氧分压为1.01×10~(-10)～1.01×10~5Pa内时,Bi_2O_3-Y_2O_3系表现为纯氧离子导体。