Catalytic steam reforming of biomass over Ni-based catalysts: Conversion from poplar leaves to hydrogen-rich syngas

A series of Ni/SBA-15 catalysts with Ni contents from 5 wt%–20 wt%and CaO-12.5%Ni/SBA-15 catalysts with CaO contents from 1.4 wt%–9.8 wt%have been prepared.The structure of the catalysts was characterized using X-ray diffraction(XRD),N2 adsorption-desorption,transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS).The performance of catalytic steam reforming of the poplar leaves to the hydrogen-rich syngas was tested in a fixed-bed reactor.The results indicate that the 7.0wt%CaO-12.5wt%Ni/SBA-15 catalyst exhibits the best performance for the catalytic steam reforming of poplar leaves to hydrogen-rich syngas.The ratio of H2:CO can reach ca 5:1 in the hydrogen-rich syngas.The yield of H2 can reach 273.30 mL/g(poplar leaves).In the CaO-Ni/SBA-15 catalyst,Ni active component mainly fills the role of catalytic steam reforming of the poplar leaves,and CaO active component mainly plays the role as water-gas shift and CO2 sorbent.     

CALCULATION OF DYNAMIC LOAD IMPACT OF BIMODULOUS BEAM WITH CONSIDERATION OF SHEAR EFFECT AND DAMPING

在考虑剪切效应及阻尼的基础上,采用线性振动理论研究了双模量梁动载荷问题的冲击计算. 建立了双模量梁动载荷问题的振动微分方程,推导出了双模量梁动载荷问题的动位移、动载荷系数、冲击时间的表达式,并讨论分析了剪切效应及阻尼对双模量梁动载荷冲击问题的影响. 算例分析表明,对于某些双模量梁动载荷冲击问题,剪切效应及阻尼的影响是不能忽略的.     

Substituent Effect on AIE mechanism of two coumarin derivatives: uncommon TICT fluorescence in aggregation state

Two coumarin derivatives, 7-diethylamino-3-(4-nitrophenyl)coumarin (DNC) and 7-hydroxy-3-(4-nitrophenyl)coumarin (HNC), were synthesized via Knoevenagel condensation of salicylaldehyde derivatives with 4-nitrophenylacetonitrile and then cyclization reaction. Both of them were characterized by single-crystal X-ray diffraction. The molecules of DNC are stacked via π-π interaction, while the hydrogen bond interactions instead of π-π interaction were observed in the crystal packing of HNC. Both of DNC and HNC showed solvatochromic properties and aggregation-induced emission (AIE) activities, but the AIE characteristics of them were entirely different. HNC exhibited an AIE phenomenon as the result of the restriction of twisted intramolecular charge transfer (TICT), while DNC emitted peculiar dual fluorescence which was assigned to the emission based on the inhibition of TICT state formation and the emission from the TICT state respectively.

     

Establishment of Galectin-3 Time-resolved Fluoroimmunoassay and its Application in Idiopathic Membranous Nephropathy

Journal of Fluorescence - The aim of this study was to establish a time-resolved fluorescent immunoassay (TRFIA) for the detection of serum Galectin-3 (Gal-3) and apply this method to evaluate the...     

Energy spreading,equipartition, and chaos in lattices with non-central forces

We numerically study a one-dimensional,nonlinear lattice model which in the linear limit is relevant to the study of bending(flexural)waves.In contrast with the classic one-dimensional mass-spring system,the linear dispersion relation of the considered model has different characteristics in the low frequency limit.By introducing disorder in the masses of the lattice particles,we investigate how different nonlinearities in the potential(cubic,quadratic,and their combination)lead to energy delocalization,equipartition,and chaotic dynamics.We excite the lattice using single site initial momentum excitations corresponding to a strongly localized linear mode and increase the initial energy of excitation.Beyond a certain energy threshold,when the cubic nonlinearity is present,the system is found to reach energy equipartition and total delocalization.On the other hand,when only the quartic nonlinearity is activated,the system remains localized and away from equipartition at least for the energies and evolution times considered here.However,for large enough energies for all types of nonlinearities we observe chaos.This chaotic behavior is combined with energy delocalization when cubic nonlinearities are present,while the appearance of only quadratic nonlinearity leads to energy localization.Our results reveal a rich dynamical behavior and show differences with the relevant Fermi–Pasta–Ulam–Tsingou model.Our findings pave the way for the study of models relevant to bending(flexural)waves in the presence of nonlinearity and disorder,anticipating different energy transport behaviors.     

The molecular recognition of tetra(p-t-butyl)tetrathiocalix[4]arene and its derivatives to heavy metal ions

The molecular recognition of tetra(p-t-butyl)tetrathiocalix[4]arene (I)and its three derivatives to heavy metal ions has been investigated by UV spectroscopy and solvent extraction. These derivatives include 5,11,17,23,-tetra-t-butyl-25,26,27,28-tetrakis(acetylmethoxy)tetrathiocalix[4]arene (II), 5,11,17,23-tetra-t-butyl-25,26,27,28-tetrakis(2'-hydroxypropyloxy) tetrathiocalix[4]arene (III), 5,11,17,23,-tetra-t-butyl-25,27-bis(3'-hydroxy propyloxy)tetrathiocalix[4]arene (IV). The UV spectra and solvent extraction of I show that it has an effective molecular recognition to heavy metal ions, especially to Cd(2+), while IV has a special molecular recognition to Ag(+) ion. These results confirmed the feasibilities for I to be applied in separation for toxic heavy metal ions Pb(2+), Cd(2+) and IV to be used as the sensor compound of Ag(+) ion-selective electrode.     

微波辐射下吲哚连噁二唑啉衍生物的合成和抗菌活性测定

把噁二唑结构引入吲哚环中,合成一类结构新颖的吲哚衍生物,以期为新药筛选提供先导化合物.在微波辐射条件下,以较高的产率得到9个未见文献报道的新化合物,其结构均经1HNMR,IR,MS及元素分析所证实,并测试了化合物的抑菌活性.     

Iron‐mediated AGET ATRP of methyl methacrylate in the presence of polar solvents as ligands

The polar solvents, N‐methylpyrrolidone (NMP), N,N‐dimethylformamide (DMF), and acetonitrile (CH₃CN) were used as ligands for iron(III)‐mediated activators generated by electron transfer atom transfer radical polymerizations (AGET ATRPs) of methyl methacrylate (MMA) with various initiators and reducing agents. Polymerizations were conducted with a molar ratio of [MMA]₀/[initiator]₀/[FeBr₃]₀/[reducing agent]₀ = 100:1:1:0.5 and a volume ratio of MMA/solvent = 2:1 at 60 °C to investigate the effects of initiator, solvent and reducing agent, and most of the systems showed the typical features of “living”/controlled radical polymerization. In order to get a deeper understanding of the mechanism, the amount of the reducing agent was changed to study the polymerization behavior. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 1020–1027     

Syntheses,Crystal Structures and Luminescent Properties of a Dimeric Complex [(bzdmpzm)Cu(μ-I)]2 and a Polymeric Complex [(bzdmpzm)Cu(μ-NCS)]n (bzdmpzm=Bis(4-benzyl-3,5-dimethyl-1H-pyrazol-1-yl)methane)

Reactions of CuX (X=I, NCS) with bis(4‐benzyl‐3,5‐dimethyl‐1H‐pyrazol‐1‐yl)methane (bzdmpzm) in MeCN resulted in the formation of one dimer [(bzdmpzm)Cu(µ‐I)]₂ ( 1 ) and one 1D polymer [(bzdmpzm)Cu(µ‐NCS)]_n ( 2 ) in high yields. 1 and 2 were characterized by elemental analysis, IR, ¹H NMR spectra, powder X‐ray diffraction and single‐crystal X‐ray diffraction. 1 consists of two scorpion‐like [(bzdmpzm)Cu]⁺ fragments bridged by two iodides, forming a dimeric structure. 2 contains a unique 1D scolopendra‐like chain of [(bzdmpzm)Cu]⁺ fragments linked by pairs of thiocyanates. The luminescence properties of 1 and 2 were also investigated.