STUDY ON COATED CERIUM-MODIFIDE MORDENITE ASAMINATION REACTION CATALYST

IntroductionAIYhationrcachonbetweenmethanolandammoniapreducesthreeacesofammesfmonomethylamine(MMA),dhaethylarnine(DMA)andtrilnethylalnine(TMA),whichareveryboortantorgbocchendcalmaterials.Monomethylamineismainlyusedforproducingagriculturalchemicals,dyesand…     

THE ELECTRONIC STATE OF Pt ON Pt/L ZEOLITE CATALYST

The effect of the alkali metal cation modification on the aromatization of n-C6 over Pt/ML zeolite catalysts (M=Li. Na. K. Rb) was studied. The results showed that the selectivity for aromati/ation of n-C6 over Pt/MI, increased as the basicity of the alkali cation increased. According to PASCA experiments, dispersed Pt particles were located on the "electron-donation" site of L zeolite XPS measurements further evidenced that a stronger hasicitv of the mouifving canon contributed more electron donation to Pt particles on the surface of 1, zeolite, and shifted the electron binding energy of Pt 4f to lower energies On the other hand, the electron binding energy of Pt 4f in Pt/ML zeolite after reduction was lower than that of Pt0 It is proposed that Pt particles in reduced samples may exist as a Ptδ- state. Moreover, the selectivity for aromatization of aikane was improved since the Ptδ- state was less active to extensive dehvdrogenation of aikane. Ptδ- stale may be presented in the reduced phase of the     

STUDY ON THE MANNICH-TYPE REACTION OF P-TOLUENESULFONAMIDE

ＳＴＵＤＹ ＯＮ ＴＨＥ ＭＡＮＮＩＣＨ－ＴＹＰＥ ＲＥＡＣＴＩＯＮ ＯＦ Ｐ－ＴＯＬＵＥＮＥＳＵＬＦＯＮＡＭＩＤＥ￥ＲｕＹｕＣＨＥＮ；ＱｉｎｇＤＡＩ（ＩｎｓｔｉｔｕｔｅｏｆＥｌｅｍｅｎｔｏ－ＯｒｇａｎｉｃＣｈｅｍｉｓｔｒｙ，ＮａｎｋａｉＵｎｉｖｅｒ...     

THEORETICAL STUDY ON PHOTODECARBONYLATION REACTION OF ACROLEIN

Photodecarbonylation reaction of acrolein at 193nm was investigated by abinitio molecular orbital method.Our result supports photodecarbonylation mechanismsproposed by Fujimoto,and predicts that the reaction should occur in ~3ππ potentialenergy surface prior to the ~1ππ potential energy surface.     

STUDY OF TPD AND KINETICS ON NO+CO OVER COPPER-SUBSTRATE CATALYSTS

The kinetics of the CO+NO reaction and the adsorption of CO,NO,CO_2 and N_2O over Cu-M-O(Ⅰ)(M=Fe or Mn)and Cu-M-Ce-O(Ⅱ)catalystswere studied in a micro reactor system with TPD technique.The results showthat the catalytic activity of(Ⅱ)is higher than that of(Ⅰ)for the CO+NO re-action,and the higher the conversion of NO,the greater the activity differencebetween(Ⅰ)and(Ⅱ)is.Over(Ⅰ)the rate of NO elimination is dependent onthe partial pressures of NO,CO,CO_2 with the kinetics orders of0.75～0.71,0.95～0.96,-0.28～-0.30,respectively.The TPD study shows that thepresence of Ce in(Ⅱ)may promote the adsorption of NO,CO on the surface,that is to say,increase the coverage(θ)_(NO),(θ)_(CO),which results in the reaction or-ders with respect to NO,CO down in the kinetics equation.For CO_2 and N_2Othe situation is opposed,the presence of Ce makes the(θ)_(CO_2),and(θ)_(NO)on(Ⅱ)de-crease,which weakens the inhibition of CO_2 for the topic reaction.     

STUDY ON A NOVEL KIND OF CHEMILUMINESCENCE REACTION

Acidic hydrogen peroxide solution,in the presence of a certain metalcation,can react with alkaline solution and produce chemiluminescence lightemission.The present paper firstly reports this novel kind ofchemiluminescence reaction.The effect of some factors and metal ions on thechemiluminescence reaction has been tested and studied.     

STUDY ON DEACTIVATION OF POTASSIUM-PROMOTED COBALT-MOLYBDENUM/ALUMINA WATER-GAS SHIFT CATALYST

The deactivation of a potassium-promoted CoMoK/Al_2O_3 Catalystwas investigated by means of XRD,XRF,XPS,ICP,FT-IR etc.The resultsshow that the reaction Pressure,deposition of Cl~- and the formation sulfateslead deactivation of the catalyst.The effect of impurities was studied systemati-cally with both qualitative and quantitative methods.The way to resolve thedeactivation of CoMoK/Al_2O_3 was discussed.     

STUDY ON THE KINETICS OF POLYMERIZATION OF MMA BY COPPER (Ⅱ) CHELATING RESINS

The polymerization of MMA initiated by copper (Ⅱ) chelating resins/CCl4 system was studied. From the kinetic data, the kinetic equation of polymerization can be expressed asRp = Ke-56400/RT[MMA]1.57[CCl4]m[RESIN-Cu]0.18where m:3-4. 5,when [CCl4] 0. 1-6. 93M. The free radical polymerization mechanism is proposed. The primary radicals are formed by the process of complexation-chlorine transformation among the copper(Ⅱ)chelating resin,CCl4 and methacrylate.     

STUDY ON ACOPPER MANGANESE OXIDE CATALYST FOR WATER GAS SHIFT REACTION

ＳＴＵＤＹＯＮＡＣＯＰＰＥＲＭＡＮＧＡＮＥＳＥＯＸＩＤＥＣＡＴＡＬＹＳＴＦＯＲＷＡＴＥＲＧＡＳＳＨＩＦＴＲＥＡＣＴＩＯＮＦｅｎｇＳｈｕｂｏ，ＬｉａｎｇＲｕｉ′ｅ，ＤｏｎｇＸｉａｎｄｅｎｇ，ＬｉｕＨｏｎｇｊｉｅ，ＭａＹｕｅ（ＨｅｂｅｉＩｎｓｔｉｔｕｔｅ...     

A STUDY ON THE CRYSTALLIZATION KINETICS OF NYLON 1010

The kinetic behavior of isohermal and nonisothermal crystallization of nylon-1010has been studied by means of dilatometry and differential scanning calorimetry, respec-tively. The isothermal and nonisothermal process can be descibed by Avrami equationand Ozawa equation, respectively. From the experimental results the kinetic paramters ofcrystallization and crystalline mechanism for isothermal and nonisothermal measurementsare discussed.     

STUDY ON THE REACTION OF ACYLISOCYANATE AND ARYL UREA

Acyl isocyanate(Ⅰ) was synthesized by the reaction of acyl chloride with lead cyanate in dichloromethane, using pyridine as a catalyst. Then, adding aryl urea(Ⅱ) to acyl isocyanate, 1-acyl-5-aryl-biuret (Ⅲ) can be obtained. 14 compounds have been synthesized by this method.     

STUDY ON LOW Ni CATALYST FOR METHANATION OF TOWN GAS

On the basis of the characterization of typical catalysts by activityevaluation,TPR,XRD and TEM,the effects of nickel content and promoterssuch as MgO,La_2O_3,and MnO_2 were discussed.Formation of MgNiO_2 by thecombination of promoter MgO with NiO increases the catalyst stability.Promot-er La_2O_3 is found well-distributed on the catalyst surface in the form of La_2O_3without any interaction with uther components.With physically scattering ef-fect,La_2O_3 can prohibit active component Ni from sintreing at high temperatureand then improve its thermal stability.It also affects the catalyst activity andreducibility.Introduction of La_2O_3 decreases the content of small Ni crystallite,and is helpful to the prohibition of carbon deposition.A new Ni-based town gasmethanation catalyst of low Ni content with high activity and high carbon depo-sition resistance is successfully developed in the laboratory.     

STUDY ON THERMAL DECOMPOSITION KINETICS OF URUSHIOL METAL CHELATE POLYMERS

The thermal decomposition kinetics of urushiol-Cu, urushiol-Nd and urushiol-Ti chelatepolymers has been studied by non-isothermal thermogravimetry. The results suggest that thethermal decomposition kinetics of three chelate polymers are all of first order. Their averageactivation energy values of the thermal decomposition calculated by Ozawa-(I) method are 110,79, 136. 98 and 163. 64 kJ mol~(-1) respectively, which increase linearly with the metal valence of themetal chelate polymers     

STUDY ON THE DETERMINATION OF TRACE BISMUTH(III) BY THIN-LAYER RESIN PHASE SPECTROPHOTOMETRY

1.INTRODUCTIONThinlayerresinphasespectrophotometryisanewanalyticalmethodinthefieldofspectrophotometricanalysis;ittakesitssourceattheliquid-liquidextractiontechniquesincombinedwithclassicalspectrophotometricanalysis.Thesubstanceofproposedmethodisaccordingtounderprinciplesthatthetargetmetalionswasassociatedwithsomeligandsinaqueousphase,thentoformedaternaryormulticomponentcomplexions,suchasanioncomplexes.Aftertheassociationreactionwasfinished,thecomplexionswillassociatedwithaion-exchangeresin…     

STUDY ON ACTIVITY AND THERMOSTABILITY OF Rh-FREE THREE WAY CATALYST

ＳＴＵＤＹＯＮＡＣＴＩＶＩＴＹＡＮＤＴＨＥＲＭＯＳＴＡＢＩＬＩＴＹＯＦＲｈＦＲＥＥＴＨＲＥＥＷＡＹＣＡＴＡＬＹＳＴＬｉＳｈｉｙａｏ，ＷｕＣｈｕｎｔｉａｎ，ＣｈｅｎｇＨｕｉｗｅｎ，ＬｉＢｅｉｌｕ（ＤａｌｉａｎＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａｌＰｈ...     

STUDY ON THE CATALYTIC REACTION OF ACETONE TO DIACETONE ALCOHOL

ＳＴＵＤＹＯＮＴＨＥＣＡＴＡＬＹＴＩＣＲＥＡＣＴＩＯＮＯＦＡＣＥＴＯＮＥＴＯＤＩＡＣＥＴＯＮＥＡＬＣＯＨＯＬＳｕｎＨｏｎｇｗｅｉ，ＨｅＦｅｉ，ＸｕＧｅｎｈｕｉ＊，ＭａＸｉｎｂｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｃａｌＥｎｇｉｎｅｒｉｎｇ，Ｔｉａｎ...     

A THEORETICAL STUDY OF THE APPLICATION OF TIME-RESOLVED X-RAY SCATTERING TO SOLID STATE REACTION KINETICS

THE purpose of this paper is to develop a theory of time-resolvedX-ray diffraction that can be used to probe solid state reactionkinetics.X-ray powder diffraction profiles for two hypotheticalsolid state reactions wore calculated using simple first-orderkinetics and nucleation and growth kinetics as models.Use wasmade of the effects on peak shape of particle size and inclusionof product particles in the reactant matrix.Applying this typeof analysis should provide not only kinetics information butalso growth rates of product particles,critical size of nuclea-tion centers,particle size of product,particle shapes,andinitial concentration of nuoleation centers.     

REACTION KINETICS OVER PRECIPITATED Fe/Mn/K CATALYST FOR THE FISCHER-TROPSCH SYNTHESIS

The kinetics of the Fischer-Tropsch Synthesis reaction is studied in an internally recycled reactor (CSTR) over a commercial, precipitated Fe/Mn/K catalyst. Kinetic data are obtained with 1 47-4.04 H2/CO feed gas over a temperature range of 265-320℃, a pressure range of 1.0-2.6 MPa, and a space velocity range of 300-800 h-1 . The kinetic model which fits the experimental data well is the same as that of the intrinsic kinetics, i.e. -RH2 CO=kPH2PCO/(PCO bPH2O, where k is the kinetic constant for the rate-determining step and b is a function of temperature only. This model may be derived by assuming that the rate-determining step is the hydrogenation of adsorbed CO according to the enol mechanism. It is found that the CO usage ratio is probably independent of synthesis gas conversion and total pressure, and the catalyst shows high water-gas-shift activity.     

STUDY ON KINETICS OF THE PHASE-TRANSFER CARBONYLATION OF BENZYL CHLORIDE CATALYZED BY DICOBALT-OCTACARBONYL

Reaction kinetics of CO_2(CO)_8-catalyzed carbonylation of benzyl chloride was studied in a liquid-liquid two-phase system(water/p-xylene). The disappearance rate of benzyl chloride is found to fit a pseudo first order kinetics law when the carbon monoxide pressure is kept constant. The observed rate constant is directly proportional to the amount of Co_2(CO)_8, PhCH_2N~+(CH_3)_3Cl~- and NaOH. It is shown that the rate-limiting step is the cleavage of the acylcobalt carbonyl [PhCH_2COCo(CO)_4] by PhCH_2N~+(CH_3)_3OH~- at the liquid-liquid interface. According to the experimental kinetic results, the reaction mechanism is suggested and the reaction rate equation is derived.     

EFFECT OF PELLETING PRESSURES ON GLOBAL REACTION RATES OF METHANOL SYNTHESIS OVER Cu-BASED CATALYST

The catalyst pore structure parameters have a great influence on theintraparticle diffusion which mainly determines the global reaction rates.In thispaper,the effects of pelleting pressures on the global reaction rates were studiedby the chemical reaction engineering theory.As a research system the Cu-basedmethanol synthesis catalysts with different pore structure parameters(specificsurface,pore volume,pore radius distribution,porosity,particle density,tor-tuosity factor etc.)have been prepared by changing the catalyst pelleting pres-sures.Based on the parallel intrinsic reaction rate equations of CO and CO_2 hy-drogenation on C301 Cu-based methanol synthesis catalyst and on the assump-tion that the intrinsic reaction rate constants per unit internal surface are thesame,the diffusion-reaction equations and parallel path cross-linked pore modelwere used for modeling the behavior of the catalyst pellet under industrial con-ditions.The models of global reaction rates had been established for CO andCO_2 hyd