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2001, Vol. 10, No. 4　Online: 2001-12-30

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SURFACE CARBON DEPOSITIONS ON NICKEL CATALYST FOR CARBON DIOXIDE REFORMING WITH METHANE Ronggang Ding;Zifeng Yan;Linhua Song;Xinmei Liu 2001, 10(4): 273-287.  DOI: 摘要 ( 8670 )   Carbon deposition on nickel catalysts is a fatal problem for carbon dioxide reforming with methane. The varieties and features of surface carbon depositions on nickel catalyst were extensively investigated by TPSR, TPD, XPS and pulse reaction methods. Thermodynamics analysis indicated that the carbon deposition is inevitable within the temperature range from 573 K to 1273 K. TPSR, XPS and TPD showed that the decomposition of methane results in the formation of at least three kinds of surface carbon species on supported nickel catalyst, carbidic C|á￡?carbonaceous C|?, and carbidic clusters C|?, which showed different surface mobility, thermal stability and reactivity.

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A STUDY ON MODIFICATION OF SEPIOLITE AND CYCLOHEXANE DEHYDROGENATION OVER Pt/Sep-Al2O3 CATALYST Laitao Luo;Songjun Li;Zhi Wu;Zhaoping Chen;Jianjun Guo 2001, 10(4): 288-294.  DOI: 摘要 ( 9095 )   The effects of acid treatment on the structure of sepiolite material and the properties of Pt/sep-Al2O3 catalyst in dehydrogenation of cyclohexane were investigated. The results showed that acid treatment results in the dissolution of magnesium from sepiolite framework and the formation of a high specific surface area material. The catalytic performance determination showed that comparing with Pt/Al2O3, Pt/sep-Al2O3 has higher activity for cyclohexane dehydrogenation and anti-poisoning ability.

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CYCLOHEXANE OXIDATION CATALYZED BY TITANIUM SILICALITE (TS-1) WITH HYDROGEN PEROXIDE Jialin Tao;Dejin Tang;Qing Li;Zuolong Yu;Enze Min 2001, 10(4): 295-307.  DOI: 摘要 ( 8773 )   Systematic experiments of cyclohexane oxidation catalyzed by titanium silicalite (TS-1) with H2O2 were performed. Three samples of TS-1 which have narrow distribution of particle sizes and good activity and H2O2 selectivity at 60oC were prepared. The effects of solvent, catalyst amount, reaction time and temperature, Ti content in TS-1 and the amount of H2O2 on the oxidation were investigated. A pretreatment for TS-1 with fine crystal is unnecessary; the optimal reaction temperature is between 80 oC ~110 oC and the best solvent is acetone.

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PROMOTING EFFECT OF ZrO2 TO CATALYTIC PERFORMANCE OF COPPER-BASED CATALYST FOR METHANOL SYNTHESIS Rencun Lin;Yiquan Yang;Youzhu Yuan;Zhongyu Lin;Chen Li;Hua Yang;Qi Wang;Hongbin Zhang 2001, 10(4): 308-318.  DOI: 摘要 ( 9188 )   By using the principle of ion doping and valence compensation, the catalytic properties of the catalyst Cu-Zn-Al-Zr obtained by adding some ZrO2 to Cu-Zn-Al were studied. The results of the activity measurement of the catalyst show that the optimum reaction temperature for MeOH synthesis is 230 oC, being 10 oC lower than that on Cu-Zn-Al catalyst XPS-Auger, XRD, UVDR, FTIR, TPD and TPR were used to study the two kinds of catalysts.

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PREPARATION OF Cu/Cr-BASED CATALYSTS FOR METHANOL DECOMPOSITION Weilin Song;Yi Jiang;Jiyuan Cheng;Junhe Chen 2001, 10(4): 319-324.  DOI: 摘要 ( 7855 )   The Cu/Cr-based catalysts were prepared by impregnation method. XRD and TPR techniques were applied to characterize the catalysts. The results showed that the Cu/Cr-based catalysts performed much better than the conventional Cu/Zn/Al catalysts, and the stability of the Cu-Cr catalyst was enhanced by promoters such as K, Mg, Ni and Y. The promoters, except Y, can improve the selectivity apparently. However, the promoters would reduce the initial activity of the Cu-Cr catalyst.

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DEHYDROGENATION COUPLING OF CH4 UNDER PLASMA IN THE PRESENCE OF CO2 Bin Dai;Xiuling Zhang;Weimin Gong;Ren He 2001, 10(4): 325-330.  DOI: 摘要 ( 9067 )   At atmospheric pressure and ambient temperature, the dehydrogenation coupling reaction of methane in the presence of carbon dioxide were performed under pulse corona plasma. The effect of addition of Pd/r-Al2O3 as a catalyst were tested on the reaction. It was found that methane and carbon dioxide converted into C2 hydrocarbons, CO, H2, O2, a little carbon and a tittle high hydrocarbons, the addition of Pd/r-Al2O3 catalyst could improve efficaciously the distribution of C2 products.

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PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE OVER TiO2 THIN FILM Zhenghuang Wu 2001, 10(4): 331-337.  DOI: 摘要 ( 9261 )   The effects of substrate temperature, the addition of Fe3+ or H2O2 solution and construction of dyes on the photocatalytic degradation of methylene blue with ultraviolet (UV) over TiO2 thin films are described. The results indicate that by coating film at 200oC, using copper wire as the substrate and adding H2O2 to the dye solution, the highest efficiency for photocatalytic degradation of methylene blue can be obtained.

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MODIFICATION AND RECENT APPLICATION OF SEPIOLITE AS A NOVEL CATALYTIC MATERIAL Songjun Li;Laitao Luo;Jianjun Guo;Fengyi Li 2001, 10(4): 338-348.  DOI: 摘要 ( 8060 )   Sepiolite is a new catalytic material with a high specific surface area and a unique pore structure, which exists widely in the nature and whose cost is not high. The modification of sepiolite, including the recent progress and the trends in catalysis was reviewed with 30 references.