Simultaneous Removal of COS and H_2S at Low Temperatures over Nanoparticle a-FeOOH Based Catalysts

Catalysts using a-FeOOH nanoparticles as the active ingredient were tested by a microreactor-chromatography assessing apparatus at atmospheric pressure between 25 and 60C with a gas hourly space velocity of 10,000 h-1, while the removal performance of H2S with catalysts was investigated using the thermal gravimetric method. The results show that the catalysts are highly active for COS hydrolysis at low temperatures (<60C) and high gas hourly space velocity, and the highest activity can reach 100%. The catalyst is particularly stable for 12 h, and no deactivation is observed. Nanoparticle a-FeOOH prepared using hydrated iron sulfate shows higher COS hydrolysis activity, and the optimum calcination temperature for the catalyst is 260C. In addition, the catalysts can remove COS and H2S simultaneously, and 60C is favorable for the removal of H2S. The compensation effect exists in nanoparticle-based catalysts.     

^31P NMR Studies on the Ligand Dissociation of Trinuclear Molybde-num Cluster Compounds

A series of carboxylate-substituted trinudear molybdenum dus-ter compounds formulated as Mo3S4(DTP)3(RCO2)(L), where RffiH, CH3, C2H5, CH2Cl, CCl3, R^1C6H4(R^1 is the group on the benzene ring of aromatic carboxylate ), L=pyridine,CH3CN, DMF, have been synthesized by the ligand substitu-tion reaction. The dissociation of the loosely-coordinated ligand L from the cluster core was studied by ^31p NMR. The dissocia-tion process of L is related to the solvent, temperature, and acidity of carboxylate groups, so as to affect the solution struc-ture and reactive properties of the duster. The long-distance in-teraction between ligands RCO2 and L is transported by Mo3S4 core.     

Synthesis,Structure and Photoluminescence of Two Zinc Carboxylate Polymers with Different Coordination Architectures

Introduction　　Thesynthesisofmetal organicpolymershasundoubt edlybeenatopicofspecialinterestduetotheirhost guestinteractionswhichhavebeentailoredtoavarietyofindus trialprocessessuchascatalysis ,adsorptionandgassepa ration .1 5Sofar ,manyeffortshavebeendedicatedtotheexplorationofmetal organicframeworkmaterialsbuiltupfrommetallicclustersandrigidorganicbuildingblocks .Thisstrategy ,asreportedbythegroupsofRobson ,6Yaghi7 11andothers ,utilizesrigidorganiclinkersfordi rectlylinkingthemetalclusters…     

Triterpenoid Saponins from Luculia pincia Hook

Two new triterpenoid saponins, cincholic acid-3-O-β-D-xylopyranoside, 28-O-β-D-glucopyranosyl ester (I), quinovic acid28-O-β-D-glucopyranosyl ester (4), and a new phenolic glucoside, 4-[4‘‘-O-( 2‘‘, 3‘‘, 5‘‘, 6‘‘-tetrahydroxy phenyl)-β-D-glucoside]-l-butene (2), along with five known triterpenoid saponins and one phenolic glucoside were isolated from the n-butanol fraction of the stems of Luculia pinciana Hook. Their structures were established by means of spectroscopic methods.     

Prediction on Critical Micelle Concentration of Nonionic Surfactants in Aqueous Solution： Quantitative Structure-Property Relationship Approach

IntroductionCriticalmicelleconcentration (cmc)ofsurfactantsinaqueoussolutionisoneofthemostusefulparametersforcharacterizingthepropertiesofsurfactants.Overaverynarrowconcentrationrangearoundthecmctransitionsoftheexistenceofsurfactantsoccurfrommonomer ,premicel lartomicellar .Andcompanyingthesetransitions ,manyotherimportantpropertiesofsurfactantsolution ,suchassurfacetension ,interfacialtension ,conductivity ,osmoticpressure ,detergency ,emulsification ,foamingandsoon ,alsochangesharplyatthepoi…     

Synthesis, Structure and Optical Limiting （OL） Properties of a Novel Incomplete Cubane-like Cluster [PPh4][η^5-C5Me5） WS3-（CuBr） （CuI）2 （μ-dppm）]

IntroductionTetrathiometallateanions [MS4 ]2 - (M =Mo ,W )andtheirclusterswithvarioustransitionmetalsarewell knownfortheirrichcoordinationchemistry ,1 7andtheirrelationtoindustrialcatalysisprocess ,8biologicalsystems ,9andNLOmaterials .10 12 However,thechemistryoftheorganometallictrisulfidecomplexes [PPh4 ][(η5 C5Me5) MS3](M =Mo ,13W14 )andtheirrelatedmixed metalclus tershavebeenlessinvestigated .15,16 Inordertoextendourknowledgeaboutthechemistryof [PPh4 ][(η5 C5Me5) MS3]andconti…     

An organic-inorganic polymer with Dawson-type polyoxometalates as building blocks: synthesis,characterization and crystal structure of [{Pr(DMF)_6}{Pr(DMF)_7}(P_2W_(18)O_(62))]_n

An organic-inorganic polymer of [{Pr(DMF)6}{Pr(DMF)7}(P2W18O62)]n has been synthesized in acetonitrile-water (5:2, volume ratio) mixed solvent. Single-crystal X-ray structural analysis indicates that the title compound crystallizes in a monoclinic lattice, P21/C, with a = 1.8574(4), b = 2.3907(5), c = 2.4222(5) nm, B= 99.48(3), Z= 4, V= 10.609(4) nm3, Dc = 3.501 Mg/m3, F(000) = 9972, R1 = 0.0654 and wR2= 0.1098. The result of crystal structure analysis reveals that Pr3+(1) complex ion is eight-coordinated with a distorted bicapped trigonal prismatic environment, which is combined with the heteropolyanion by terminal oxygen atom, whereas Pr3+(2) complex ion is also eight-coordinated with a distorted square antiprismatic environment, which is linked to the heteropolyanion by terminal oxygen atom. Adjacent structure units of [{Pr(DMF)6}{Pr(DMF)7}(P2W18O62)] are bridged through W-O-Pr1-O-W links to form an unprecedented one-dimensional zigzag linear chain by alternate polyanions and cationic units in the po     

Preparation of porous α-Fe2O3-supported Pt and its sensing performance to volatile organic compounds

Porous α-Fe2O3 was synthesized by a simple hydrothermal treatment of FeCl3 aqueous solution followed by a calcination process. In the synthesis of porous α-Fe2O3, no templates or pore-directing agents were used. The as-prepared porous α-Fe2O3 was further employed as a support for loading Pt nanoparticles. The gas sensing performance of the obtained porous α-Fe2O3-supported Pt to VOCs was investigated. The sensor presented a high response and fast response-recovery characteristic to several VOCs including acetone, ether, methanol, ethanol, butanol and hexanol. Meanwhile, it exhibited a much higher response than the pure α-Fe2O3 at the operating temperature of 260°C. The enhanced sensing properties may be related to the unique porous structure of the α-Fe2O3 support and the promoting effect of active Pt nanoparticles for the sensing reactions.     

The eigenenergies for ~3S excited states of the helium atom with CFPHGLF method

The matrix elements of the correlation function between symmetric potential harmonics were first simplified into the analytical summation of the grand angular momentum. The correlation-function potential-harmonic and generalized Laguerre function method (CFPHGLF) proposed by us recently was then applied to directly solve the Schrodinger equation for n3S(n=2-5) excited states of the helium atom. With only 12 PHs, the convergent eigenenergies of 23S, 33S, 43S and 53S states were 2.17427, 2.06849, 2.03644, 2.02257 Eh, respectively. The errors only were 0.00096, 0.00020, 0.00007, 0.00005 Eh, when compared with the exact Hylleraas variational results respectively.     

Mossbauer study of reactions of Sn[Fe(CN)_6] on supports

Mossbauer spectroscopy has been applied to the investigation of reaction of Sn[Fe(CN)6] on magnesia, 7-alumina, silica and activated carbon. It was found that the thermal decomposition products of supported Sn[Fe(CN)6] are quite different from those of the unsupported one as a result of the interaction between the complex and supports. The supports could promote the oxidation in the air atmosphere and their effect led to high dispersion of the decomposition products on the surface.