共查询到18条相似文献,搜索用时 171 毫秒
1.
IntroductionInthcsclcctivcoxidationofalkanes.suchas'theoxidativccouplingofmcthanc(0CM)andthcoxidativcdch}'drogenationofcthanc(0DE)t0prcparccth}'lene.bothoxidcionsofthelatticeandtheox}'genspeciesovercataIystsuffocepla}'animportantrole.Althoughcxtcnsivcinvcstigationshavcbeengivcntothecharactcrizationofox}'gcnspccicsandthcreactionofox}'gcnspecicsx`ithalkanes,itisstilldifficulttosayt`hichoncsofox}'gcnspcciesarcthcactivcspecicsinthcactivation0falkancs.bccauscthenaturcofcatal}'stsandthecxperimcntc… 相似文献
2.
lntroductionInordcrtoselcctivcl}'produccIightoIcfinsfroms}'ngas.thcbinderusedforimprovingthecatal}'ststrcngthshouldbcfavorabIcforprimary'formingofligl1tolcfinsfroms}ngasandforprohibitingsidereactionsoflightoIcfi.sIll.lthasbccnshownthattheundesirablcstrengthofsilicalitc-2zcolitccanbcimprovcdb}addingbindcrs.Hot`ycver.thcadditionofthcbinder`"illcauscsomcchangcsinthcph}'sical-chcmicalstatcofthecatal}ticactivemetalas``cllasitscatal}ticbcha.io,ll'2I.InourprcviouspaperTiO2wasprovedtobcadcsirablcbi… 相似文献
3.
EFFECTS OF PROMOTERS ON CATALYTIC PERFORMANCE OF Pt-Sn/MgAl2O4 CATALYST FOR PROPANE DEHYDROGENATION IN THE PRESENCE OF STEAM 下载免费PDF全文
IntroductionCatal}-tiedch}-drogcnationoflightalkancshasgreatindustrialimportancebecauseitrcprcscntsanalternativeforobtainingalkcncsforpci}.mcriZationandotherorganics}'nthcscsfromlot"costsaturatedh}'drocarbonfeedstocks.SomeprocessessuchasCATOFIN.OLEFLEX.Ph… 相似文献
4.
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… 相似文献
5.
IntroductionTheaimofprcscllt\t-orbisthedot'clopmcntofcatal}-stsu'hicharchighl}'sclccti\'ctothes"nthcsisofCZandC3alcoholsfronls}'llgas.Cocatal}'stscanenhancetheproductionofCZalcohol.butthe}'arcalsoacti\'cfortheF-Ts}.nthcsisint'hichtheproductdistributionfol… 相似文献
6.
YAN Zi-Feng 《天然气化学杂志》1996,5(2):116-125
1yttroductionIMcthancactivationisoncofthemostintriguingsubjectsinheterogencouscatal}'sisbccauscmcthancisathcrmod}namicall}'stabIccompoundt`ithanoblcgas-likeconfiguration.0fintcrcstsisthcrcccntt"orkreportcdb}'KocrtsIll,BeIguedl21.andYanl3ltthosucccssfull}'convcrtnaturalgasintohighcrh}.drocarbonsb}'thctt"o-stcproutcinwhichnaturalgasisfirstthcrmall}'activatcdonthctransitionmctalcatal}.stsatmoderatctemperature.Toasccrtainthcnaturcofrcactionsofmcthane.thcactivationofmcthaneisextensivel)'invcstiga… 相似文献
7.
YAN Zi-Feng 《天然气化学杂志》1996,5(3):261-271
Introduction0ncofthcintriguingpr0blcmsinhctcrogcncouscatal}'sisisthcactit'ationanddircctconversionofmcthancintoliquidfucIanduscful.h..i..l,lllMcthancactivationisvcry'difficultbccauscn1cthancisathcrmod}'namicalI}'stablccompoundt`ithanoblcgas-likcconfigurati0nThcvcry'strongtctrahcdralC-Hbonds(435kJ/mol)offcrnofiJnctionalgroups,magncticm0mcnts'orpolardistortionstofacilitatcchcmicalattackThismakcsmcthanelcssrcactivcthanncarl}'allitsconvcrsionproducts.Rccentl}'oxidativccouplinghasbecnconsidcrcda… 相似文献
8.
IntroductionOxidativccouplingofmethanc(0CM)hasbccnthcsubjcctofmuchintcrcstrcccntl}Man}'mctaloxides,alkali-mctaI-promotcdmctaloxidcs-mixcdmcta1oxidcsandchlorinc-prom0tedmCtuloxidcshavcbecnf0undtobcactivcfor0CMHot` cvcr.thcrcisatprcscntnoclearagreemcntaboutthcmcchanismofthecouplingrcaction.T\`omodclsll1.thcthdeal-rcdoxandthcLangmuir-Hinshtt-oodmcchanisms.havcbccndcvcIopcdtodcscr1bc0CMreation-thecsscntialdiffercnccbctt"ccnthctt"omodclsisthatthclattcrinvolvcsadsorbedmothancasarcactionintcrmcd… 相似文献
9.
Intr0ductionRcccntl}.n1uchprogrcsshasbcc11n1adcinthcscIcctivcCOh\'drogcnationproducingliglltolcfinsvIas}'ngasb}'dct'clopingasilicalitc-2zcolitcsupp0rtcdFccatal\'st.Ithasbccllshox\llthatasilicaIitc-2zcoIitcsupportcdFccatal\'stpromotcdb}'aIkalin1ctalandMnOdispla}sadcsirabIcolcfil1sclccti\'it}(asl1ighas7()%)andadcsirablcCOcont'crsion(muchhighcrthan7O%)\\ithabett.,rcactionlifconst,ca.I1~31.Ho\\cvcr-thcundcsirablcstrcl1gthofSi-2zcolitcisunsuitabIcforitsapplicatiOninindustry-\\hichsIlouldbci… 相似文献
10.
lntroductionThclox"-tcmpcraturcs)nthcsisofmcthanolfroms}'nthcsisgasviamcth}'lformatcconsistsofcarbon}'IationofMc0Htomcth}'lformatc(McF)(bclox`l()O"C).andhydr0gcnol\'sisofMcF(bclot"2OO"C)totx"oMcOHasshox`nbclo`"fCH30H C0=HC0OCH;l(l)HC00CH3 2H2=2CH3OH(2)Wcrcfcrtothisasthctx"o-stcpmcthanoIs}nthesis.Thccarbonylationofmcthanolisahomogcncousl}'catal}'zcdrcactionusingalkalimctalmethoxidesascataIystsinthellquidphasc.Thct},picalrcactionconditionsarc60~90"Cand3.O~5.OMPa.Thercactionisanex… 相似文献
11.
XU Long-Ya WANG Qing-Xia XU Yi-De HUANG Jia-ShengDalian Institute of Chemical Physics Academia SinicaDalian Liaoning State Key Laboratory of CatalysisDalian Institute of Chemical Physics. Academia SinicaDalian Liaoning To whom correspondence should be addressed. 《天然气化学杂志》1995,(3)
The activity and the selectivity to light alkenes of silicalite-2 (Si-2) zeolite supported F'e catalyst tor CO hydrogenation can he improved obviously with the addition of K2O and MnO promoters. The results of CO hydrogenation, CO-TPD, CO/H2-TPSR, C2H4/H2-TPSR and C2H4/H2 pulse reaction over K-Fe-MnO/Si-2 catalysts clearly show that the K2O additive into Fe-MnO/Si-2 catalyst leads to a remarkable increase in both the capacity and strength of the strong CO ad-species that will produce much more |Cad| via their disproportionation at higher temperatures. This results in an increase in the CO conversion and the selectivity to light olefins, and a decrease in CH4 formation. Moreover, K2O can suppress the disproportionate of C2H4 that occurs during the reaction as a side-reaction Meanwhile, the MnO promoter mainly prohibits the hydrogenation of C2H4 and C3H6, which is favorable to enhancing the selectivity to C2H4 and C3H6 and decreasing the formation of C2H6, and C3H8. It is also of interest that MnO has har 相似文献
12.
EFFECTS OF BINDERS ON THE PRODUCTION OF LIGHT ALKENES FROM SYNGAS OVER K-Fe-MnO/SILICALITE-2 CATALYST I. EFFECT OF VARIOUS BINDERS ON CO HYDROGENATION 下载免费PDF全文
The performance of the K-Fe-MnO/Si-2 catalyst for the production of light olefins via Co hydrogenation changes obviously with the addition of binders. The results of CO hydrogenation. TPR, Mossbauer spectra CI0TPF, CO/H2-TPSR and C2H4/H2-TPSR are employed to investigate the effects of various binders on the physical-chemical states and catalytic behaviors of K-Fe-MnO/Si-2 catalyst to produce light olefins via syngas, TiO2 can promote the reduction of Fe and strengthen the adsorption of CO resulting in raising olefin selectivity. Other binders such as Al2O3, SiO2, MgO, once added into the catalyst, may cause formation of inorganic salts between FeO and Binders leading to a decrease of Fe reduction and a loss of olefin selectivity for CO hydrogenation. Especially, For K-Fe-MnO/Si-2 catalyst with Al2O3 binder directly, the strong secondary reactions of ethylene during CO hydrogenation cause a very poor light olefin selectivity, which will be improved greatly by modifying Al2O3. 相似文献
13.
K-Fe-MnO/Silicalite-2 is a desirable catalyst for the production of light olefins from CO2 hydrogenation The activity can be improved greatly with increasing the Fe loading, and the selectivities to hydrocarbons rise with Fe loading increase However, an ambiguous effect of Fe loading on the selectivity of light olefin in hydrocarbon products is observed. The CO2 hydrogenation containing a two-step mechanism CO2+H2=CO+H2O, a reversible water gas shift reaction, and CO+(m/2n+1)H2 =1/nCnHm+H2O2, a Frscher-Tropsch reaction, is suggested by the results of CO2-TPD and CO2/H2-TPSR as well as CO/H2-TPSR characterizations. 相似文献
14.
Fe—Silicalite—2催化剂表面CO2加氢反应性能的研究 总被引:3,自引:0,他引:3
研究了Fe/Silicalite-2催化剂CO2加氢低碳烯烃反应性能,利用CO2-TPD,CO2/H2-TPSR和CO/H2-TPSR表征手段,考察了铁含量及MnO助剂对Fe/Silicalite-2催化剂CO2吸附脱附及加氢反应性能的影响,表明随铁含量增加可提高催化剂对CO2的吸附能力,有利于提高CO2加氢反应的转化率。 相似文献
15.
PRODUCTION OF LIGHT OLEFINS FROM CO_2 HYDROGENATION OVER Fe/SILICALITE-2 CATALYST Ⅰ.CATALYTIC REACTIVI-FY AND REACTION MECHANISM 下载免费PDF全文
IntroductionRcccntl}'.researchinterestinhctcrogcllcotlscatal\'ticCOZh\'drogcnationhasfocusedontileproductionofh}'drocarbonsl1~-if.Asfortheformationoflightolefins.afo\'papershat'cbccllptlblishcdlit>l.Ho\\c\cr.tileprodllctionoflightolcfillsf'ronlCOZh}'droge… 相似文献
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17.
ThisprojectissllpportedbytheNationalNaturalScienceFotmdationofChina.IntroductionRecentstUdyonCOZhydrogenationfortheformationofhydrocarbonshascausedagreatinterest,especiallyintheproductionoflightalkenes.msreactionwillprovideanalternativeroutetoproducebasic… 相似文献
18.
XU Long-Ya* WANG Qing-XiaLIANG Dong-Bai TIAN Zhi-JianYANG Li ZHAO Xiu-Shen WANG Kai-LiDalian Institute of Chemical Physics Academia Smica Dalian Ijiaaning 《天然气化学杂志》1995,(2)
High selectivity to light alkenes can be achieved from CO and CO_2hydrogenation over K-Fe-MnO/Si-2 catalyst.The alkene selectivity isinsensitive to reaction temperature for CO hydrogenation,while apparentlyincreases for CO_2 hydrogenation with raising reaction temperature.An increasein alkene selectivity is observed for both CO and CO_2 hydrogenation with GHSVrising,While a decrease with the elevation of reaction pressure for both CO/H_2and CO_2/H_2 reaction.A two-step mechanism is suggested forCO_2 hydrogenation to form hydrocarbons,by which the variations incontributions of CO and HC as products of CO_2/H_2 reaction with change ofreaction temperature,GHSV and pressure are explained.Moreover,thecatalyst is favorable for selective production of light olefins,which can alsoconcern the slightly secondary reactions of light olefins to some extent. 相似文献