Thermal decomposition of carbonates, carboxylates, oxalates, acetates, formates, and hydroxides
作者:Jacob Mu、D.D. Perlmutter
DOI:10.1016/0040-6031(81)80175-x
日期:1981.11
Abstract A study is reported of the controlled decomposition of various metal carbonates, carboxylates, oxalates, acetates, formates and hydroxides and their common hydrates, carried out in a thermogravimetric analyzer, a differential scanning calorimeter, and a differential thermal analyzer. Various sample sizes, heating rates, and ambient atmospheres were used to demonstrate their influence on the
work, hydrodeoxygenation (HDO) of dibenzofuran (DBF) was studied over high-surface-area MgO supported Pt, Pd and Ru catalysts at 370 °C and 1.0 MPa. It was determined that the active metals not only affect the catalytic activity, but also change the reaction pathway of HDO of DBF. The intrinsic activity (TOF) of MgO supportedcatalysts follows the trend: Pt/MgO (0.36 s−1) > Ru/MgO (0.29 s−1) > Pd/MgO
由于源自化石的资源消耗和对环境的日益关注,衍生自木质素的含氧化合物的转化引起了广泛的关注。在这项工作中,在370°C和1.0 MPa的高表面积MgO负载的Pt,Pd和Ru催化剂上研究了二苯并呋喃(DBF)的加氢脱氧(HDO)。已确定活性金属不仅影响催化活性,而且改变了DBF的HDO的反应途径。MgO负载型催化剂的固有活性(TOF)遵循以下趋势:Pt / MgO(0.36 s -1)> Ru / MgO(0.29 s -1)> Pd / MgO(0.09 s -1),并伴有越来越多的激活障碍。Pt在DBF的氢化中具有很高的活性,并且表现出理想的脱氧活性,随后是氢化(HYD)途径。Ru表现出更好的C芳烃O键裂解能力,而从DBF中去除氧主要是通过直接脱氧(DDO)途径进行的。Pt负载的增加通过增强HYD和DDO途径大大促进了DBF的转化。此外,C芳烃的更直接裂解O键在较高温度下发生,并且通过DD
Mimicking mineral neogenesis for the clean synthesis of metal–organic materials from mineral feedstocks: coordination polymers, MOFs and metal oxide separation
作者:Feng Qi、Robin S. Stein、Tomislav Friščić
DOI:10.1039/c3gc41370e
日期:——
We present a systematic study of a mild approach for the activation of metal oxides, involving reactivity and self-assembly in the solid state, which enables their solvent-free chemical separation and direct solvent-free and low-energy conversion into coordination polymers and open metal–organic frameworks (MOFs). The approach is inspired by geological biomineralization processes known as mineral weathering
Structural and zeolitic features of a series of heterometallic supramolecular porous architectures based on tetrahedral {M(C2O4)4}4– primary building units
作者:Inhar Imaz、Georges Bravic、Jean-Pascal Sutter
DOI:10.1039/b503964a
日期:——
Their 3-D chemical scaffold is based on the primary tetrahedral building unit but their pore sizes and topologies could be varied through the M2+ metal ion involved in the assembling process, and the anionic tetrahedral moiety. These structures display channels with apertures up to 12 Å × 8 Å which are emptied of solvates at mild temperatures without affecting the chemical scaffold, the integrity of
利用四面体预先形成的配位化合物M(C 2 O 4)4 } 4− (M = Zr IV,U IV ; C 2 O 4 2− =草酸盐)可以有效地构建稀有的杂核超分子纳米实例多孔的架构。通过将这些建筑单元与Mn 2 +,Cd 2+或Mg 2+结合而制备的一系列金属-有机配位框架已经进行了结构表征和描述。他们的3-D化学支架基于主要的四面体结构单元,但是其孔径和拓扑结构可能会通过组装过程中涉及的M 2+金属离子和阴离子四面体部分而发生变化。这些结构显示通道的孔径可达12Å×8Å,在温和的温度下可以清空溶剂化物,而不会影响化学支架,而化学支架的完整性可保持在250–300°C。一定程度的协调灵活性聚合物粉末X射线图谱的温度依赖性和N 2吸附实验表明,在客体释放后,小分子的可逆和选择性吸附被证实,证实了这些开放框架的行为类似于海绵。
Properties of Magnesium Oxides Prepared from Various Salts and Their Catalytic Activity in 1-Butene Isomerization
basicity, one-electron donor property, and surface area were examined on the magnesiumoxide catalysts prepared from six different kinds of magnesium salts. Magnesiumoxide prepared from magnesium nitrate, oxalate, and acetate exhibited strong basicity and relatively large surface area and, on the other hand, MgO prepared from magnesium chloride, carbonate and sulfate had relatively weak basicity and small