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《中国化学快报》1992,(2)
Fe_3(CO)_(12)-derived Fe/r-AL_2O_3 and Fe/zeolite catalysts have higher catalytic activity than those derived from Fe(NO_3)_3. The existence of metal-metal bond in cluster species and the congruity of the adsorption of CO and H_2 are important for increasing the catalytic activity. Carbon deposition for Fe_5C(CO)_(15)-derived Fe/r-AL_2O_3 catalyst is discussed. 相似文献
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The supported Rh-DIOP complexes were prepared through functionalization of several macroporous polystyrene resins and were evaluated by the hydrogenation of acetamidocinnamic acid in EtOH. The pore effect of the matrixes was discussed. 相似文献
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《中国化学快报》1993,(7)
The MOC reaction over ZrO_2/LaF_3, CeO_2/LaF_3 and ThO_2/LaF_3 catalysts indicatedthat these catalysts had high activity and high C_2 selectivity at low temperature.In the temperature range 480℃ to 650℃. The methane conversion was 24. 4% to 30. 8%and the C_2 selectivity was 40. 0% to 55. 4%. The XRD characterization of thecatalysts indicated that O~2. and F exchang happened and LaOF was formed. 相似文献
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《天然气化学杂志》1992,(3)
The CO hydrogenation over Rh_4(CO)_(12)SiO_2 catalyst promoted with man-ganese and lithium was reported.As compared with conventional RhCI_3/SiO_2 catalyst,silica-supported rhodium carbonyl cluster catalysts have higher reactive activities.Manganese increases CO conversion by more than one order of magnitude and lithiumlowers CO hydrogenation activity,whereas Rh_4(CO)_(12)-MnCl_2-LiCI/SiO_2 catalyst giveshigher CO conversion and selectivity to C_2-oxygenate.XPS and IR spectra show thatmanganese stabilizes Rh(Ⅰ)ions and facilitated CO molecule activation via its syner-gism with rhodium enhancing CO conversion obviously.ESR results preliminarily revealthe interaction of rhodium with manganese.The mechanism of CO hydrogenation is dis-cussed primarily. 相似文献
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SELECTIVE HYDROGENATION OF BENZALDEHYDE TO CYCLOHEXANEMETHANOL CATALYZED BY SILICA－SUPPORTED CARBOXYMETHYL CELLULOSE－PLATINUM COMPLEX 总被引：1，自引：0，他引：1
ＳＥＬＥＣＴＩＶＥＨＹＤＲＯＧＥＮＡＴＩＯＮＯＦＢＥＮＺＡＬＤＥＨＹＤＥＴＯＣＹＣＬＯＨＥＸＡＮＥＭＥＴＨＡＮＯＬＣＡＴＡＬＹＺＥＤＢＹＳＩＬＩＣＡ－ＳＵＰＰＯＲＴＥＤＣＡＲＢＯＸＹＭＥＴＨＹＬＣＥＬＬＵＬＯＳＥ－ＰＬＡＴＩＮＵＭＣＯＭＰＬＥＸ￥Ｌｉ... 相似文献
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IntroductionAsoncofthemostabundantandcheapestcarbonsourccs,Co2u,ithsteadilyincreasingconcentrationintheatmospherenotonlyleadstothelossofcarbonsource,butalsocausesgrccnhouseeffects.Recently,Co2wastestedasafecdstockformcthanolproductionovcrdiffcrentcatalystsclse.'hcrell'21,butmostofthesecatalystswerebasedonthecombinationofcoppcrandzincandpreparedbycoprecipitation,ioncxchangcor'l3'4]Accordingtoextensivestudiesaboutsupports,SiO2wasoncoftheimpregnationl3'4]Accordingtoextensivestudiesaboutsupport… 相似文献
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《天然气化学杂志》1994,(3)
Rh-V/SiO_2 catalyst for the synthesis of C_2-oxygenates from syngashas been studied by means of reaction evaluation,TEM,TPR,TPD and FT-IRspectroscopy.It has been found when vanadium promoter was incorporated intothe Rh/SiO_2 catalyst,the rate of C_2-oxygenate formation was increased bymore than an order of magnitude,and the selectivity was improved from ca.30% to more than 70%,based on carbon efficiency.The vanadium ion inRh-V/SiO_2 catalysts can be readily reduced to lower valence states,and the ca-pacity of hydrogen adsorption remarkably enhanced for the catalyst.Further-more,for the Rh-V/SiO_2 catalyst cooled in H_2 to room temperature after reduc-tion,the vibration frequencies of CO adsorbed on it exhibit large red-shifts of40-70cm~(-1) for bridged CO and of ca.10cm~(-1) for linear CO,as comparedwith those of the unpromoted Rh/SiO_2 catalyst and of the promoted Rh-V/SiO_2 catalyst outgassed at 573 K after reduction by hydrogen.A model of COactivation by metal rhodjum,lower valence vanadium and activa 相似文献
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A novel molecular probe for identifying properties of supported transitionmetals and metal oxides catalysts was established.The catalytic mechanism oftransition metals was proposed. 相似文献
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ＳＹＮＴＨＥＳＩＳＯＦＰＯＬＹＭＥＲ－ＳＵＰＰＯＲＴＥＤＰＡＬＬＡＤＩＵＭＣＡＴＡＬＹＳＴＳＡＮＤＴＨＥＩＲＣＡＴＡＬＹＴＩＣＢＥＨＡＶＩＯＲＦＯＲＴＨＥＳＥＬＥＣＴＩＶＥＨＹＤＲＯＧＥＮＡＴＩＯＮＯＦＭＥＳＩＴＹＬＯＸＩＤＥＬｉＨｏｎｇ；ＪｉｎＸｉ... 相似文献
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SELECTIVE HYDROGENATION OF 2－NAPHTHOL CATALYZED BYA SILIC A－SUPPORTED POLYALUMAZANE PLATINUM COMPLES
《中国化学快报》1994,(11)
ＳＥＬＥＣＴＩＶＥＨＹＤＲＯＧＥＮＡＴＩＯＮＯＦ２－ＮＡＰＨＴＨＯＬＣＡＴＡＬＹＺＥＤＢＹＡＳＩＬＩＣＡ－ＳＵＰＰＯＲＴＥＤＰＯＬＹＡＬＵＭＡＺＡＮＥＰＬＡＴＩＮＵＭＣＯＭＰＬＥＳＣｈｕｎＷｅｉＣＨＥＮ；ＪｉＷｅｎＺＨＥＮＧ；ＭｅｉＹｕＨＵＡＮＧａｎ... 相似文献