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2001, Vol. 10, No. 2　Online: 2001-06-30

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ELABORATION OF NOVEL Cu-Cr-Si CATALYSTS FOR METHANOL SYNTHESIS AT LOWER TEMPERATURE Wei Chu;Kuiling Wang;Tao Zhang;Shizhong Luo;Yutang Wu 2001, 10(2): 95-100.  DOI: 摘要 ( 8668 )   When silica was added into Cu-Cr catalysts, a significant promotion in the activity for the methanol synthesis at lower temperature in slurry-phase was observed. The influences of preparation parameters were investigated. The calcination in an inert N2 atmosphere was better than that in air, a better dispersion of the Cu+ active centers could be obtained. With the Cu-Cr-Si new catalyst, a methanol STY of 185 g/(h?¤L) could be achieved at 110oC, 4.5 MPa.

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STUDY ON THE CONVERSION OF METIIANE TO C2 HYDROCARBONS THROUGH SYMMETRIC ELECTRICAL FIELD ENHANCING CATALYSIS Baowei Wang;Genhui Xu;Hongwei Sun 2001, 10(2): 101-109.  DOI: 摘要 ( 8081 )   Low-power catalytic conversion of methane to C2 hydrocarbons (ethane, ethylene and acetylene) through AC or DC plasma catalysis reactions in symmetric electrical field was studied under low temperature and atmospheric pressure. The function of catalyst was tested. The appropriate condition was: voltage 90 V~110 V (power 15 W~20 W DC), voltage 20 V~40 V (AC). The appropriate inlet flow of methane was 45 mL/min~80 mL/min under AC and DC field. The selectivity to C2 hydrocarbons was above 95%.

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MECHANISTIC STUDIES ON CO/CO2 HYDROGENATION TO METHANOL OVER Cu-Zn-Al AND Cu-Zn-Al-Li CATALYSTS Lizhen Gao;Jitao Li;C T Au Peter 2001, 10(2): 110-146.  DOI: 摘要 ( 8154 )   Cu-Zn-Al (45/50/5) catalyst (Cat) and Cu-Zn-Al-Li (40/50/5/5) catalyst (Cat-Li) have been prepared and employed for methanol synthesis from CO/H2 and CO2/H2, respectively. Techniques/methods such as TPD, TPR, TPSR, pulsing, CD_3I-trapping, isotope labeling, EPR, and in situ DRIFT were adopted to characterize the catalysts and to Study the reaction mechanism. Catalysts in the states of H-eliminated, H-containing, and O-containing were investigated comparatively to clarify the effects of surface O and H on the activation of CO2 and CO.

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ELECTROCHEMISTRY OF NICKEL(II) TRYPTOPHAN FILM ELECTRODE AND ELECTROCATALYTIC OXIDATION OF METHANOL Yurong Ma;Qiuxia Yang;Wei He;Xuelin Wang 2001, 10(2): 147-157.  DOI: 摘要 ( 7929 )   A polymer film of tryptophan was obtained at a glassy carbon electrode (GC) by cyclic voltammetry. The cyclic voltammograms of the polymer film electrode(poly-Try GC) exhibited two redox waves. After incorporation of Ni(II), the electrode (poly-Ni(II) Try/GC) was greatly improved in catalytic activity. The potential 0.65 V of methanol oxidation at the poly-Ni(II)Try/GC is much more negative than the potential at the poly-Try/GC and at the bare glassy carbon (GC) electrode in 0.01 mol/L NaOH.

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SYNTHESIS AND CHARACTERIZATION OF Si- AND Zr-SUBSTITUTED HETEROATOM-ALUMINOPHOSPHATE ZEOLITES Zheming Wang;Zifeng Yan 2001, 10(2): 158-167.  DOI: 摘要 ( 7946 )   The APO-11 zeolites substituted by Si and Zr (denoted as SAPO-11 and ZAPO-11, respectively) were hydrothermally synthesized. The crystalline structure, surface morphology, and pore distribution were studied by means of XRD, SEM, TG-DTA, EDX and adsorption of nitrogen. The results show that the APO-11, SAPO-11 and ZAPO-11 zeolites have the same crystalline structure and that APO-11 and SAPO-11 are sphere grains While ZAPO-11 is bar crystalline, Which is attributed to the pH value of medium for the growing of crystalline.

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EFFECT OF ALKALI METAL PROMOTER ON THE PROPERTIES OF Ni/CaO-Al2O3 CATALYST FOR REACTION OF METHANE WITH AIR Lixia Shang;Weiguo Xie;Shaojie Lu;Fali Qiu 2001, 10(2): 168-175.  DOI: 摘要 ( 8362 )   The influence of alkali metal promoter in Ni-based catalyst for catalytic oxidation of methane with air to syngas was investigated by using TPO, CO2-TPD, XPS and CO pulse chromatograph. The experimental results showed that the alkali metal promoter is effective in the suppression of carbon deposition on catalyst. The abilities of resistance to carbon deposition are ordered as below: Ni-K2O/CaO-Al2O3>Ni-Li2O/CaO-Al2O3>Ni-Na2O/CaO- Al2O3>Ni/CaO-A12O3. And, the catalyst Ni-Li2O/CaO-A12O3 has higher activity and selectivity.

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STUDY ON THE MECHANISM OF METHANATION OF CARBON DIOXIDE Songjun Li;Laitao Luo;Jianjun Guo 2001, 10(2): 176-180.  DOI: 摘要 ( 9369 )   The views on the mechanism of carbon dioxide methanation were reviewed. The possibility of two kinds of methanation mechanisms was discussed on the basis of kinetics and thermodynamics. The results reveal that CO2 methanation proceeded via hydrogenation of oxacid radical but not CO hydrogenation. At the same time, the effects of CO on CO2 methanation were studied.