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2001, Vol. 10, No. 1　Online: 2001-03-30

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EFFECT OF FOREIGN CARBON ON ACTIVITY OF METHANE COMBUSTION OVER SUPPORTED PALLADIUM CATALYSTS Caixia Qi;Lidun An;Hongli Wang 2001, 10(1): 1-16.  DOI: 摘要 ( 9635 )   EDTA as precursor of carbon was introduced into Pd(NO3)2 catalysts supported on Al2O3 or 5%MgO/Al2O3. Two kinds of samples, denoted as Pd(NO3)2/[support+EDTA] and [Pd(NO3)2/support]+EDTA, were prepared by changing sequence of impregnating EDTA to the supports. After only being dried they were tested for methane combustion. XPS analyses to the samples at different stages of testing reaction were performed. It was found that the Pd(NO3)2 catalysts became more inactive due to the introduction of EDTA.

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IN-SITU REGENERATION OF AN Fe-BASED CATALYST FOR F-T SYNTHESIS Guohui Li;Jinglai Zhou;Yu Li;Jingwen Hu 2001, 10(1): 17-23.  DOI: 摘要 ( 9799 )   An Fe-based catalyst for F-T synthesis was regenerated in-situ three times in a single tube reactor during a 3 000 h scale-up test, with C6~C11 distillate produced from the F-T reaction as the washing solvent, and H2 or syngas as the reducing gas. It can be seen that after regeneration, the pressure drop of the catalyst bed was decreased from 1.0 MPa to 0.1 MPa, the reactivity of the catalyst was recovered. The reasons for the catalyst deactivation and the increase of pressure drop of catalyst bed were discussed.

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THERMODYNAMIC ANALYSIS OF CO2 DIRECT HYDROGENATION REACTIONS Fahai Cao;Dianhua Liu;Qiushi Hou;Dingye Fang 2001, 10(1): 24-33.  DOI: 摘要 ( 11152 )   CO2 hydrogenation is one of important routes for the activation and effective utilization of CO2. In this paper, eighteen CO2 direct hydrogenation reactions are listed and their reaction heats and equilibrium constants are calculated. On the assumption that the reactions of CO2 and H2 are in stoichiometric ratio and the amount of whole reactants is one mole, the equilibrium conversions of CO2 are obtained.

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STUDY OF MnOx-PROMOTED Cu/|?-Al2O3 CATALYSTS FOR HYDROGENATION OF CARBON MONOXIDE Gongxin Qi;Jinhua Fei;Zhaoyin Hou;Xiaoming Zheng 2001, 10(1): 34-41.  DOI: 摘要 ( 11143 )   |?-Alumina-supported copper-manganese oxide was prepared by impregnation and used for carbon monoxide hydrogenation. The Cu-MnOx/Al2O3 catalysts exhibit high catalytic activity in CO hydrogenation, showing markedly enhanced catalytic activities due to the synergistic interaction between the copper and manganese oxide. The results of XRD indicated that the addition of manganese enhances the dispersion of CuO, retards the reduction of CuO and enhances the ability of H2-adsorption, which contribute to the activity of DME synthesis from syngas.

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HYDROESTERIFICATION OF ACETYLENE WITH METHYL FORMATE TO METHYL ACRYLATE OVER A NiO/Al_2O_3 CATALYST: EFFECTS OF NiO LOADING AND CALCINATION TEMPERATURE Xinhan Huang;Xiangui Yang;Jiaqi Zhang;Zhaotie Liu 2001, 10(1): 42-50.  DOI: 摘要 ( 9538 )   Hydroesterification of acetylene with methyl formate (MF) was studied over a series of nickel-supported catalysts with NiO loading varing from 0.8 wt% to 18.7 wt% and calcination temperature ranging from 623 K to 873 K. The catalyst was studied by TPR, XPS, XRD and BET. The interactions between impregnated Ni2+ and alumina during catalyst preparation produced different kinds of nickel species such as NiO crystallites and NiAl2O4-like species, and their distributions varied with NiO loading and calcination temperature.

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STUDY OF Ni/SEPIOLITE AND Ni-Sm/SEPIOLITE CATALYSTS Laitao Luo;Songjun Li;Jianjun Guo;Gengfen Deng 2001, 10(1): 51-60.  DOI: 摘要 ( 11639 )   Ni/sepiolite and Ni-Sm/sepiolite catalysts were prepared by impregnation and their properties were characterized by the means of TPR, TPD, XRD and XPS, respectively. The results show that the addition of Sm to the Ni/sepiolite can decrease not only the partical size of nickel but also nickel atomic binding energy. Besides, it also increases the dispersion of nickel on sepiolite support. The reduction and desorption peak temperature in TPR or TPD curves changed after adding Sm.

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ADVANCES ON THE RESEARCH AND DEVELOPMENT OF CATALYSTS FOR TOLUENE DISPROPORTIONATION AND C9 AROMATICS TRANSALKYLATION Qingling Chen;Zaiku Xie 2001, 10(1): 61-70.  DOI: 摘要 ( 8201 )   Advances on the development of commercial catalysts using in the processes such as Tatoray(Toluene Disproportionation and C9 Aromatics Transalkylation of UOP Company), MTDP (Toluene Disproportionation Process of Mobil Company), S-TDT (Toluene Disproportionation and C9 Aromatics Transalkylation of SRIPT), Trans-Plus, PX-Plus (Selective Toluene Disproportionation of UOP Company) and MSTDP (Selective Toluene Disproportionation Process on Mobil's ZSM-5 catalyst) have been reviewed.

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A STUDY ON MEMBRANE PROCESS WITH |?-ALUMINA MEMBRANE REACTOR FOR ETHYLBENZENE DEHYDROGENATION TO STYRENE Qingling Chen;Zhongqiang Xu 2001, 10(1): 71-81.  DOI: 摘要 ( 10064 )   The membrane reaction of ethylbenzene(EB) dehydrogenation to styrene(ST) has been studied by using K2O/Fe2O3 industrial catalyst and alumina ceramic membrane developed by our institute. In comparison with the packed bed reactor (that is, plug flow reactor, abbr. PFR) in industrial practice, the yield of styrene was increased by 5%~10% in the membrane reactor. Furthermore, mathematical modeling of membrane reaction has been studied to display the principle of optimal match between the catalytic activity and the membrane permeability.

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PHOTOCATALYTIC DEGRADATION OF WASTE WATER ON THIN FILMS OF TiO2 Zhenghuang Wu 2001, 10(1): 82-87.  DOI: 摘要 ( 7992 )   The degradation of organic phosphorous pesticide waste water using thin films of TiO2, which was prepared in an atmospheric vertical chemical vapor deposition system, was studied. The results show that the wafer material for coating TiO2, the photocatalytic time, the TiO2 crystal phase, the pH value and the concentration of pesticides in waste water influence the degradation rate. These facts indicate some potential for photocatalytic treatment of waste water by utilizing sunlight.

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ADVANCES IN SULFUR RECOVERY TECHNOLOGY IN CHINA Jianwen Da;Yiling Zhang 2001, 10(1): 88-92.  DOI: 摘要 ( 5918 )   This paper reviews the present status of national sulfur recovery technology, and raises the prospect of sulfur recovery technology development in 10 to 15 years.