INTRAPARTICLE DIFFUSION EFFECTS IN FISCHER-TROPSCH SYNTHESIS Ⅱ.EFFECTS OF PARTICLE SIZE,TEMPERATURE AND PORE STRUCTURE

lntroductionThccatal}'stcffcctivenessfactorismainl}'affectcdb}'itsporcstructurc-butthcparticlesizeandtcmperaturearcaIsoimportantforthediffesionandrcactionUnderindustrialopcrationconditionsforthcstrongl}'exothermicFischcr-Tropschs}nthcsis(FTS)reaction,temperaturedistributionalongcataI}ticbedisccrtainl}ununiform.andthus,theeffectivcncssfactorsarenaturall}'changcd.Whatisimportantisthatthccffectivcncssfactorsarestrictl}'detcrmincdb}'thcparticlcsizeandcorrcspondingporcparameters.lnvcstigationsont…     

EFFECTS OF BINDERS ON THE PRODUCTION OF LIGHT ALKENES FROM SYNGAS OVER K-Fe-MnO/SILICALITE-2 CATALYST Ⅱ. MODIFICATION EFFECT OF Al_2O_3 BINDER ON CO HYDROGENATION

lntroductionInordcrtoselcctivcl}'produccIightoIcfinsfroms}'ngas.thcbinderusedforimprovingthecatal}'ststrcngthshouldbcfavorabIcforprimary'formingofligl1tolcfinsfroms}ngasandforprohibitingsidereactionsoflightoIcfi.sIll.lthasbccnshownthattheundesirablcstrengthofsilicalitc-2zcolitccanbcimprovcdb}addingbindcrs.Hot`ycver.thcadditionofthcbinder`"illcauscsomcchangcsinthcph}'sical-chcmicalstatcofthecatal}ticactivemetalas``cllasitscatal}ticbcha.io,ll'2I.InourprcviouspaperTiO2wasprovedtobcadcsirablcbi…     

THE ADSORPTION OF OXYGEN OVER ThO_2-BaF_2 CATALYST

IntroductionInthcsclcctivcoxidationofalkanes.suchas'theoxidativccouplingofmcthanc(0CM)andthcoxidativcdch}'drogenationofcthanc(0DE)t0prcparccth}'lene.bothoxidcionsofthelatticeandtheox}'genspeciesovercataIystsuffocepla}'animportantrole.Althoughcxtcnsivcinvcstigationshavcbeengivcntothecharactcrizationofox}'gcnspccicsandthcreactionofox}'gcnspecicsx`ithalkanes,itisstilldifficulttosayt`hichoncsofox}'gcnspcciesarcthcactivcspecicsinthcactivation0falkancs.bccauscthenaturcofcatal}'stsandthecxperimcntc…     

Application of Rayleigh Light Scattering Spectroscopy to the Determination of Proteins Using Bromo-Pyrogallol Red

ThoughRa}-leighlightscattering(RLS)hasbeenextensi\'el}'stUdiedandappliedforman}'years-itisrarelyusedinanal}ticalcheIinap'.Recenh}'.Huangetal.usedRLSforanal}ticalpUrpOse5todeterndnethequaLnhhesofnucleicacidswitha.o'V-6-tetra-(4-drieth}l-anunoniumphen}'l)porphyrinf11Itisalsofoundthatlightscattenngofbromo-P}Togallolredisenhancedgreah}'b}'proteins.andbasedonmis.anewproteinassa}'methodisputforward.msmethodisatleast3o-foldmoresensiti1-ethant-heconunonlyusedproteinassa}'s[2-31ffeSspectIacyig-1…     

CHARACTERIZATION AND CATALYTIC BEHAVIOR OF WATER-SOLUBLE PHOSPHINE RHODIUM (I) COMPLEX

IntroductionInhomogcncouscatal}-sis*arccurrentproblcmisthcseparationofthcorganicproductsfromtheactivecatal}'stThcapplicationoft`atersolubletransitionmctalcomplcxcsf0rcataI}ticrcactionshasrcccntl}'attractcdconsidcrablcattcntio.lI~3l.Thcx"atcr-solubleligandsarcslightl}'solublcinorganicmcdia-allot"ingthccatal}'sistobccarricdoutinat\"o-phascs}'stcm.Catal\'strccovcry'isthuscasil}'achievcdb}'dccantationandseparationofthctx"ophascs.Thctris(sodiumm-sulfophcn}-l)-phosphinc,P(m-C6fuS03Na)3(abbr.asTP…     

TPSR STUDIES OF THE ACTIVATION OF METHANE ON SUPPORTED PLATINUM CATALYSTS

1yttroductionIMcthancactivationisoncofthemostintriguingsubjectsinheterogencouscatal}'sisbccauscmcthancisathcrmod}namicall}'stabIccompoundt`ithanoblcgas-likeconfiguration.0fintcrcstsisthcrcccntt"orkreportcdb}'KocrtsIll,BeIguedl21.andYanl3ltthosucccssfull}'convcrtnaturalgasintohighcrh}.drocarbonsb}'thctt"o-stcproutcinwhichnaturalgasisfirstthcrmall}'activatcdonthctransitionmctalcatal}.stsatmoderatctemperature.Toasccrtainthcnaturcofrcactionsofmcthane.thcactivationofmcthaneisextensivel)'invcstiga…     

EFFECT OF SOLVENT ON ZEOLITE SYNTHESIS

Introductionltistvellknox`nthath}'drothcrmalcn'stallizationisaconventionaltechniqueforzeoliteandmolccularsicvcs}nthcsls.Watcrassolvcntplaystheroleofminerali.ation[ll.Inl985,BibbyandDalcrcportedfirstl}'thes}'nthcsisofsilica-sodaliteinethyleneglycolsol.e.tl2l.Sincetllcn,man}'kindsofzeolitcst"ercpreparedinnon-aqueoussystemsHott'ever,noinformationonthcinfluenccofsolvcntonzcolitcsynthesishasbecnreported.Inthispapcr,t"crcportanintcrcstingcxamplc.Incascsofnosolventandusingx`atcr,cth}'lcneglycolandc…     

The New Synthesis of Azo Urea from Substituted Semicarbazide

AzocompouIldsare1'en'importantinorganicchemistn'.The}hax'ebeenx"idel}'utilizedasd}resandanal}1icreagents.1andcanalsobeusedinmatenalofnon-linor0ptics.materialofopticsinf0rmationstoringinlaserdish.andd}-est`-ithoilsolubilib'inphotochrom}inmoderntechnologi'.2Recent1)'man}notett'orth}studiesshol`thatazobenzenederit'ah1'espossessven'goodophcrememberingandphotoelectncproPerties.OPtical-su'itchjngandimagestoragecanbemadebyazobenzeneliquidcn'stalfilm.3Otheru'iseazocomP0undscanbeusedinthermotropicliq…     

INTRAPARTICLE DIFFUSION EFFECTS IN FISCHER-TROPSCH SYNTHESIS Ⅰ. MODELING OF DIFFUSION AND REACTION

IntroductionCatal}ticrcactionsaffcctcdb}'diffosionaIlimitationincatal}'stporcshavcbccnextensive1}dcaltx`ithinlit.rat.rcll~5I.Scvcraltcchniqucsonthcspccialcase0fFischcr-Tropschs}'nthcsis(FTS)t\crcapplicdtocxplorcthebchaviorofthiscatal}ticrcactionundercxpcrimcntalandopcrationaIconditionsI3~5l.It`"ouldbeofvaluctoindicatchcrcthatthcseinvcstigationsx"ercmainl}'bascdonthesimplcstkineticsofthcfirstordcrinH2proposedbyAndersonl6]attheearIystages.However-thesetboents,striCtlyspeaking,areinvalidfor…     

Synthesis and Diastereomeric Analysis of Uridine 2’,3’-Cyclic Phosphite

Projectsupportedbyagrant(#29472069)fromTheNationalNaturalScienceFoundationofChina.Nucleoside2',3'-cyclicphoSPhatesareproductinti1eANAll}'drolysiscatal}2edbyribonucleases.ChedricalmodfficahononthephosPhategroupprOducesdiastereomersttihlRPandSPconfigUrhon'the}'canserveasusefulprobeforinvestigationoftheenn'maticreachoncourseandstereocheAnstn'.Asreportedb}'Ecksteinandco-t"orkers.'-#RNaseA.xt'llichhyd1olyzesP}vimidil1enucleoside2',3'-cyclicphoSPhatetoproduceP}vimjdinenucleoside3'-pllospl…     

METHANE OXIDATIVE COUPLING: SYNERGISTIC PROMOTION OF BINARY METAL FLUORIDES TO THORIA BASED CATALYST ThO_2/LaF_3/BaF_2

Introductionlnthcstud}ofmcthaneoxidativccoupIing(0CM),aseriesofcatalystshavebeendevelopedandox}'genspeciesoncatal}'stst"ereinvestigatedextensively.Alotofpapershavebeenpublishedonthisarea.Anongkindsof0CMcatalystsmetalhalidespromotedmctaloxides.cspcciall}'Li /Mg0catal}'stl1~3l.havcbecnmostoftenstudied.Themostpromisingindustrialoncshavebeenthoughttoberarcearthoxidesbasedcatalysts.H.L.Wanelajl#Ihavesuccessfull\'madeuseofmetalfluoridesin0CM,andfoundthebcttcrpron1otingcffectofmctalfluoridcstomc…     

EFFECT OF ThO_2 ON SrCO_3/BaSO_4 CATALYST IN OXIDATIVE COUPLING OF METHANE

IntroductionSincethepioneeringt"orkofKcllcrandBh.,i.IlI.theoxidativccoupl1ngofmethane(0CM)hasrcceivedx`orldt`.idcattcntion.Sofar-man}'kindsofcatal}'stsfor0CMhavcbecndeveIoped.0nthcbasisofextensivelitcrature,thccatal}'stsfor0CMboastssomccommonfcaturesasfolIo``sl2lf(l)thebasicityofcatalyst,(2)thestabilit}'ofcarbonateoncatal}'stsuffocc,(3)`"atcr-rcsistingpropcrt}',(4)conductionofox3'gcnions,(5)Psemiconductorundcrhightempcraturc.Thcscbricfl}'gcncralizcthccharactcristicsof0CMcataly'sts.butnot…     

Sensitization of Microporous Nanocrystalline TiO_2 Electrode with Quantum Sized RuS2 Particles

SensitizationoflargebandgapsemiconductorelectrOdetx,ithorganicd}eandinorga-nicmateriaIshasbeeneXtensivel}'studiedox'ertbepastdecade.Recentl}'GratZe1andco.'orke,[l]deteloPedanettkindofsolarcellbasedond)'esen5itizedsemiconductorelectrodecomprisedofnanocry'stalIineparticles.Thenanocn'stallinesemiconductorelectrodepossesseshighl}'porousstructUreandmuchlargersurfacethanconx)enhona1plaincn'stalelectrodesothatel7enlessthanonemonola)yerthedyecou1dalmostcompletel}'absorbtheincidentlightintheabsorpti…     

EFFECTS OF PROMOTERS ON CATALYTIC PERFORMANCE OF Pt-Sn/MgAl2O4 CATALYST FOR PROPANE DEHYDROGENATION IN THE PRESENCE OF STEAM

IntroductionCatal}-tiedch}-drogcnationoflightalkancshasgreatindustrialimportancebecauseitrcprcscntsanalternativeforobtainingalkcncsforpci}.mcriZationandotherorganics}'nthcscsfromlot"costsaturatedh}'drocarbonfeedstocks.SomeprocessessuchasCATOFIN.OLEFLEX.Ph…     

Synthesis of a Poly(amide-imide)from 5,6-Diphenyl-1-chloroformyl3,4-benzenedicarboxylic Anhydride and Bis (4-aminophenyl)ether

Pci}linlidesareac'ellknownasolleofthe"lostinlportalltclassesof1llgh-perf'ornlance.pci}'nlers.Ilo-c'lever.thed'utilizationisgreatl}'limitedduetotheirpoorhandlingandprocessingcharacteristics'.Anulllberofmethodsincludingincorporationtlexibleornons}l'mmetricallinkagesinpolymerbackboneorusingmollonlersfaithbulkysubstituents.havebeenusedtoilllprovetheirsolubility.Poly(anlide-ilnide)shavealsobeenprovidedatbvorablebalancebetweellprocessability'andperforlllance'.illtillsletter.Wesynthesizedanovelnlonom…     

STUDIES OF THE HOMOLOGATION OF METHANE ONSUPPORTED TRANSITION METAL CATALYSTS

Introduction0ncofthcintriguingpr0blcmsinhctcrogcncouscatal}'sisisthcactit'ationanddircctconversionofmcthancintoliquidfucIanduscful.h..i..l,lllMcthancactivationisvcry'difficultbccauscn1cthancisathcrmod}'namicalI}'stablccompoundt`ithanoblcgas-likcconfigurati0nThcvcry'strongtctrahcdralC-Hbonds(435kJ/mol)offcrnofiJnctionalgroups,magncticm0mcnts'orpolardistortionstofacilitatcchcmicalattackThismakcsmcthanelcssrcactivcthanncarl}'allitsconvcrsionproducts.Rccentl}'oxidativccouplinghasbecnconsidcrcda…     

STUDIES OF TPSR AND PULSE REACTION OF METHYL IODIDE ON SILICA-SUPPORTED NOBLE METAL CATALYSTS

IntroductionAttcn1ptstoclucidatcthcmcchanismofCtOh}drogcnationontransitionmctalcatal\stsbyusingprobcmoIcculcscanbctraccdbacktoatlcastascarl}'asl95ll]lAlthoughthistcchniqucisanindircctx"a}'ofstud}'ingsurfaccrcactionmcchanisms.itallot"sustostud}'inslIusurfaccrcactionsundcrccrtainconditionsx"hichusualI}'cannotbcprobcdb}'morcdirectinstrumcntalmcthodssuchassurfaccspcctrosc0pictcchniqucsOfintcrcstisthcreccntt"orkrcp0rtcdb}'Bclgucdl2l'KocrtsI3jandYa.l4j\"hoachict'cdthcconvcrsionofmethanctotbrmC2~…     

SELECTIVE PRODUCTION OF C_2 AND C_3ALCOHOLS FROM SYNTHESIS GAS

IntroductionTheaimofprcscllt\t-orbisthedot'clopmcntofcatal}-stsu'hicharchighl}'sclccti\'ctothes"nthcsisofCZandC3alcoholsfronls}'llgas.Cocatal}'stscanenhancetheproductionofCZalcohol.butthe}'arcalsoacti\'cfortheF-Ts}.nthcsisint'hichtheproductdistributionfol…     

Synthesis and Crystallization of N-Benzoyl Tauryl Phenylalanine

HydrolysispePhdesatapboCularbondisvery~rtanincheIinStryandphannacology.Concehongonthestudyofcatalghcantithaes,althoughmpsuccessfiileXaInleshavbeenreportedinestershydrol}sis-therearestillgrcaanculhesinaInidehydrol}sis.CarboothaseA(CPA)isaproteinofbothesteraseandPephdaseachvihes,soweselectedthesubStratehippUrylphenylalamneofCPAasmodeltodesignandSynthesizenewhaPtenmoleculewhichcontalns-SOzNH-groupinsteadofco2NH-b}'bioisostericreplacement,andexPeCtedtopreParecatalyticantibodwithpePhdase…     

RNA Cleavage by N-Phosphoryl Serine in Histidine Buffer

ANAcleax!ageagentshavereceivedconsiderableattenhonformulhplepUIPOses.Inailybecausethe}'shouldbe\.aluabletoolsformolecularbiologr.biotechnologyandgenetheraP}"'='.B)'far'mostoftheANAh}'drol}1iccatalystsaremetalcomplexesandamines.Metalcomp1exespromoteoxidati\'eclea1'ageofnucleicacidsufhichma}'resultinthedesmichonofthesubstrates'".Inadclition.foreffectivecleax'age.veryhighconcentr8tionofaminesandhightemperaturewererequired'>'".Ontheotherhand,thec1ea\'ageofRNAviahydrolysisofthephosphotalester…