THERMOSTABILITY OF LiCu_2O_2 AND LiCu_3O_3

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CRYSTAL AND MOLECULAR STRUCTURES OF TWO ISOMERS OF DIETHYL 2, 3-DICYANO-2, 3-DIPHENYLSUCCINATE

Diethyl 2, 3-dicyano-2, 3-diphenylsuccinate was prepared through the oxidative coupling of ethyl α-cyanophenylacetate with Cu~(++)-TMEDA-O_2 system. The product gave, upon chromatography, two crystalline compounds 1 and 2. The single crystals of 1 and 2 were identified by X-ray crystallographic analysis to be meso-and racemie-diethyl 2,3-dicyano-2,3-diphenylsuccinate respectively. It is noteworthy that in the molecules of 1 and 2 there is a remarkable lengthening effect of the bond length for the central C—C bond, i. e. 1: 1.585; 2: 1.62. It is also observed that there is steric hindrance between the substituent groups attached to the two carbon atoms of the central C—C bond respectively. These data provide the structural basis for the facile dissociation into radicals and the action of polymerization initiator of the title compound. CNDO/2 calculation of charge density and Wiberg bond order for compound 1 yields the results, which are consistent with the crystallographic data.     

REACTION OF 3-ACETYLTROPOLONE WITH 2-HYDROXYBENZALDEHYDES

3-Acetyltropolone(1)reacted with 2-hydroxybenzaldehyde(2a),2-hydroxy-5-methylbenzaldehyde(2b),5-chloro-2-hydroxybenzaldehyde(2c)and 2-hydroxy-l-naphthaldehyde in presence of ethylformate and perchloric acid to give the corr-esponding pyranylium tropolone perchlorate.     

EFFECT OF Y_2O_3 ON THE PROPERTY OF NiO/Al_2O_3 CATALYST FOR PARTIAL OXIDATION OF METHANE

The effects of Y_2O_3 on the property of NiO/Al_2O_3 catalyst forcatalytic partial oxidation of methane were investigated in a continuous flowfixed bed reactor(20 mm i.d.,860 mm long).The catalysts werecharacterized by XRD and pore measurement.For comparison,similar studieswere carried out for the catalysts loaded with Zr or W oxide.The results showthat different additives and impregnating methods could greatly affect thedispersion of component Ni.The catalytic activity,the selectivity to CO andthe stability are improved because of the less facile interation between thesupport and nickel oxide,greater surface area and better dispersion of metalNi for NiO/Al_2O_3 catalyst modified by Y_2O_3.     

PROPERTY OF Al F3 CATALYSTSPREPARED BY FLUORINATION OF Al2 O3 WITH HF

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TREATMENT OF WASTEWATER FROM PRODUCTION PROCESS OF 2，3—ACID

Wastewater from production process of 2,3-acid was treated by adsorption using macroporous resin NDA-708.After only one-step treatment by resin adsorption,removal efficiency of three kinds of naphthalene chemicals was above 99%;removal eficiency of CODcr was above 96%.Under proper operating condition,desorptionefficiency was around 100%.The running records of the industrial facility showed that the naphthlene chemicals in desorption effluent could be reused without obvious influence on the quality of the product.     

ROLE OF MoO_3 AND La_2O_3 PROMOTERS IN Ni-CATALYZED METHANATION REACTIONS OF CO

A series of catalysts containing nickel were prepared by impregna-tion.The activity,heat resistance and sulfur resistance of catalysts were inves-tigated using catalytic microreactor.The experimental results show that the Ni/γ-Al_2O_3 catalysts containing molybdenum or lanthanum possess higher activity,better heat resistance and sulfur resistance than Ni/γ-Al_2O_3 catalyst.The sur-face behaviour of catalysts and the role of molybdenum or lanthanum in Ni-Mo-La/γ-Al_2O_3 system have been studied by XRD,TEM,XPS and TPY.It hasbeen shown that the addition of molybdenum or lanthanum can increase theconcentration of nickel atoms on the surface of catalysts,make the crystallinegranule of nickel smaller,increase the number of active centers of nickel andaffect the electronic structure of nickel.All these avtions will improve thecatalytic activity and surface behaviour of catalllysts.     

PREPARATION OF V_2O_3 BY THERMAL DECOMPOSITION OF HYDRAZINE-CONTAINING VANADIUM SALT

A new method of preparing V_2O_3 by thermal decomposition from hydrazine-containing vanadium salt was described. The process was investigated by thermal analysis (TG and DSC) and the thermally decomposed product was studied by S.E.M., chemical analysis and X-ray diffraction. The result indicated that the product obtained in this way was V_2O_3.     

THE PHOTOVOLTAIC PROPERTIES OF NANOCRYSTALLINE Nd_2O_3

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SYNTHESIS OF 3-(2-QUINOLYL)TROPOLONES

3-Acetyltropolone was reacted with 2-aminobenzaldehydes to afford 3-(2-quinolyl)tropolones.2-Acetyl-7-methylaminotropone and 2-acetyl-7-ethylamino-tropone were respectively reacted with 2-aminobenzaldehydes to give the corres-ponding 2-(2-quinolyl)-7-methylaminotropones and 2-(2-quinolyl)-7-ethylaminotro-pones,which after treatment with sodium hydroxide solution also afforded 3-(2-quinolyl)tropolones.     

SEMICONDUCTING PROPERTIES OF In_2O_3 ANODIC FILM

The good potentiality of the In_2O_3 anodic film as a photoanodicmaterial has been demonstrated.The anodic oxidation of In substrate inalkaline solution for obtaining In_2O_3 film has been developed and theirsemiconducting properties have been investigated through capacitance,photoelectrochemistry and electroreflection measurements.     

DECOMPOSITION OF KNO_3/γ-Al_2O_3 AND THE FORMATION OF SURFACE BASE SITES

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CRYSTAL STRUCTURE OF 2-METHYL-3-PHENYLACRYLOYL-QUINOXALINE 1,4-DIOXIDE

<正> C18H14N2O3,Mr=306. 32,Monoclinic,P21/b,a = 5. 579(1),b = 8. 963 (2),c = 29. 405(7) A,γ= 92. 62(2)°,V= 1468. 8(7) A3.Z=4, Dx= 1.385 gcm-3, CuKa radiation, μ= 7. 45 cm-1,F(000) = 640,final R= 0. 039,Rw= 0. 045 for 1006 observed (I>3σ(I)) reflections. The quinoxaline part of the molecule is virtually planar. The dihedral angle between the benzene ring of the phenylacryloyl and quinoxaline ring is 99. 6°.     

OXIDATIVE COUPLING OF METHANE OVER Na_2O-La_2O_3/BaCO_3 CATALYSTS

The oxidative coupling of methane over various alkali metal oxidespromoted LaO_2O_3/BaCO_3 catalysts and the effects of Na_2O content on the performance of Na_2O-La_2O_3/Ba_2CO_3 catalyst have been studied.It was found thatNa_2O promoted La_2CO_3/BaCO_3 catalyst showed advantages of high CH_4 conver-sion,C_2 selectivity and C_2H_4/C_2H_6 ratio,Na_2O might affect the properties ofcatalyst through elctronic and geometric effuts.The highest C_2yield(19.0一20.6%)over Na_2-9wt%La_2O_3/BaCO_3 catalysts was obtained in the Na_2Ocontent range of 1.0—3.0%.Effects of reaction conditions on OCM over3wt% Na_2O-9wt%La_2CO_3/BaCO_3 catalyst were also investigated.The catalystswere characterized by BET,TPD,and XRD.TPD studies on 3wt% Na_2O-9wt%La_2O_3/BaCO_3 catalyst demonstrated that CO_2,CH_4.O_2could bestrongly on the catalyst.This might be related to the activation of CH_4 and theformation and reseneration of active oxygen soecies.     

EFFECTS OF La_2O_3 LOADING MANNER ON THE CHEMISORPTION AND HYDROGENATION OF CO ON La_2O_3-PROMOTED Pd/siO_2

The effects of La_2O_3 as a promoter of Pd/SiO_2 catalyst and its loading manner on thechemisorption and hydrogenation of CO have been investigated using in situ FTIR,TPSR,CO adsorp-tion,activity evaluation of methanation and TEM.The results show that the addition of La_2O_3 to thePd/SiO_2 can promote the dissociation and hydrogenation of CO,but causes a noticeable suppression inchemisorption of CO.This is probably due to partially reduced La_2O_3 moieties which decorate the sur-face of Pd particles.In addition,the effects of La_2O_3 promotion on the adsorptive and reactive propertiesof Pd/SiO_2 depend strongly on the loading manner of La_2O_3.It means that the method of preparationhas a significant effect on the degree of interaction between La_2O_3 and the surface of Pd particles.     

CRYSTAL STRUCTURE OF 2, 4-DITHIONE-3-AMINO-1, 3, 2-OX-AZAPHOSPHORINEBENZO-2-THIONO PYRIDINIUM

<正> The structure of title compound [C7H6N2OPS3]-·[HNC5H5]+ was determined by x-ray diffraction. It belongs to monoclinic system with space group P21/a, a = 16.745(2), b= 8.563(2), c=21. 050(5)(?), β=93.32(1)°, V= 3013. 6(?)3, Z = 8, Mr = 341. 4, F (000) = 1536, Dc=1. 504 g. cm-3,μ= 53. 0 cm-1. The crystal is composed of discrete cations C5H5NH+ and anions CrH6N2OPS3-. There are two pairs of the cations and the anions in each asymmetric unit. The stability of the anion is increased by the formation of (d-p)π bonding involving the 3d orbital of the P atom and the lone electron pairs of the S atoms.     

DEACTIVATION OF P_2O_5-MgO/RE_2O_3 CATALYST FOR OXIDATIVE COUPLING OF METHANE

Techniques including TPD,XPS,XRD and spectrophotometry have been applied to theinvestigation of the deactivation of a highly active P_2O_5-MgO/RE_2O_2 catalyst during a 100-h test.The results of the studies have shown that there is little difference in various properties between thefresh and the deactivated catalyst except for the surface acid-base property which is demonstrated to becontrolled by the presence of phosphorus on the catalyst surface.The deactivation of the catalyst ismainly due to the heavy loss of phosphorus on the surface that causes an increase of the surface basiccenters and a decrease of the surface acid centers,and the coordination between the acid and basiccenters is considerably weakened with a subsequence of the drop of the C_2 selectivity.     

NONLINEAR OPTICAL STUDY OF Fe_2O_3 UFP SOL

In this letter,Fe_2O_3 UFP(Ultrafine Particles)hydrosol and organosol with highthird order optical nonlinear susceptibility(3)have been reported for the first time.The surfacial modification of Fe_2O_3 UFP with dodecylbenzenesulfonate ions(DBS)canenhance the nonlinear optical response through interfacial confinement of electron motion.The involved mechanism is discussed.     

A CONVENIENT SYNTHESIS OF β-CYCLODEXTRIN 2-AND 3-O-MONOBENZOATE

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