担载液相催化剂的研究Ⅶ．乙烯羰化制丙醛的宏观动力学

担载液相催化剂的研究Ⅶ．乙烯羰化制丙醛的宏观动力学①胡斌孙懿张红平刘省明殷元骐②（中国科学院兰州化学物理研究所，兰州７３００００）关键词羰基化乙烯丙醛固定化催化剂动力学丙醛的生产方法有多种，工业上主要应用羰基合成法．在５０年代以前，以羰基钴作催化剂，...     

希土冠醚类配合物的研究 ⅩⅣ.希土碘化物与15—冠—5配合物的合成及性质

希土冠醚配合物是近年来引起人们广泛兴趣的研究领域。到目前为止,已研究了包括硝酸根、溴离子、异硫氰酸根、高氯酸根、六氟磷酸根、三氟醋酸根等作为抗衡阴离子的希土冠醚配合物。由于碘离子易被氧化,REI_3不稳定,因此相应的配合物也容易分解,至今文献中尚未见到有关碘离子作为抗衡阴离子的希土冠醚配合物的报道。我们合成了希土碘化     

NO和O2在Pt(110)面上吸附的TDS和PEEM研究

采用热脱附和光电子发射普微镜研究了Ｏ２和ＮＯ在Ｐｔ（１１０）面上的吸附和共吸附。结果表明，室温条件下，ＮＯ在Ｐｔ（１１０）面上有端式和桥式两种不同的吸附方式。Ｐｔ（１１０）表面预吸附的原子态氧占据了ＮＯ进入了桥式吸附的活性粒，从而阻遏了ＮＯ在Ｐｔ表面发生解离反应必须经过的桥式吸附中间态的形式，进而降低了ＮＯ在Ｐｔ表面直接分散的能力。     

Carbon–silica composite bio-sorbents with a high density of oxygen-containing sites for efficient methylene blue adsorption

Research on Chemical Intermediates - There is a growing trend to employ agricultural waste/by-products (AWBs) as substrates for the development of dye bio-sorbents, and surface modification plays a...     

Adsorption equilibrium,kinetics and mechanism of Pb(II) over carbon–silica composite biosorbent with designed surface oxygen groups

Research on Chemical Intermediates - Heavy metal contamination, especially contamination involving Pb(II), is a major environmental problem faced by modern society; hence, research on...     

Deposition of N-doped carbon layers inside acidic ZrSBA-15: significant enhancement of catalytic performance of Pd NPs toward benzyl alcohol aerobic oxidation

Journal of Sol-Gel Science and Technology - Palladium-based catalysts with equably distributions of surface functionalities are synthesized by anchoring palladium nanoparticles onto N-doped carbon...     

Design of Photoactive Covalent Organic Frameworks as Heterogeneous Catalyst for Preparation of Thiophosphinates from Phosphine Oxides and Thiols

Two new covalent organic frameworks (COFs) were synthesized from 4,4′,4′′,4′′′-(pyrene-1,3,6,8-tetrayl)tetraaniline and 2,5-dimethoxyterephthalaldehyde (Py-DMTA-COF) or 2′,5′-dimethoxy-[1,1′:4′,1′′-terphenyl]-4,4′′-dicarbaldehyde (Py-DMTPDA-COF) under solvothermal conditions. These two COFs were further facilely developed as efficient photocatalytic platforms for the synthesis of thiophosphinates. Py-DMTA-COF exhibited better photocatalytic activity, broad substrate applicability, and excellent recycling capacity for the preparation of thiophosphinates from P(O)H compounds and thiols compared to Py-DMTPDA-COF. This methodology was further extended to the seamless gram-scale production of target phosphorothioate derivatives. The results demonstrate that COFs can provide a robust platform for developing metal-free, base-free, highly efficient, and reusable heterogeneous photocatalysts for organic transformations.     

Generalized moment-independent importance measures based on Minkowski distance

Importance measures have been widely studied and applied in reliability and safety engineering. This paper presents a general formulation of moment-independent importance measures and several commonly discussed importance measures are unified based on Minkowski distance (MD). Moment-independent importance measures can be categorized into three classes of MD importance measures, i.e. probability density function based MD importance measure, cumulative distribution function based MD importance measure and quantile based MD importance measure. Some properties of the proposed MD importance measures are investigated. Several new importance measures are also derived as special cases of the generalized MD importance measures and illustrated with some case studies.