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Fundamental studies of the mechanism of catalytic reactions with catalysts effective in the gasification of carbon solids and the oxidative coupling of methane. Quarterly report, April 1, 1993--June 30, 1993

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[唯一标识符]:CDSTIC.DOE.10176357
[文献来源]:美国能源部报告数据库
[文献类型]:科技报告
[资源原始索取号]:OSTI ID: 10176357; Legacy ID: DE93019103
[标题]:Fundamental studies of the mechanism of catalytic reactions with catalysts effective in the gasification of carbon solids and the oxidative coupling of methane. Quarterly report, April 1, 1993--June 30, 1993
[作者]:Heinemann, H.; Somorjai, G.A.; Perry, D.L.
[机构]:Lawrence Berkeley Lab., CA (United States)
[文摘]:The last quarterly report (LBL-33769) summarized results obtained with ternary catalysts; e.g., K-Ca-Ni oxide and K-Ca-Co oxide. It was also shown that chars prepared in e presence of NAOH were more easily gasified than the base char, even if the chars were washed to remove all residual free NAOH. During the present report quarter, three variables were investigated: (1) The effect of varying the atomic ratio of different catalyst components (alkali vs. transition metal); (2) The effect of steam partial pressure and of temperature on the reaction; (3) Determination of activation energy of the reaction over K-Ca-Co oxide. It was also found that if the water (steam) used for gasification contains a small amount of NAOH, gasification rates are greatly improved. Figure 1 shows that the gasification rate improves with increasing Co content of the catalyst, though the differences between different Co contents are relatively small. A very similar effect was observed for different concentrations of Fe{sup 3+} in KCa-Fe oxide catalysts. Figure 2 presents conversion vs. time plots for gasification of an Ill {number_sign}6 char (which had been charred in the presence of 0.5% caustic) over a K-Ca-Co oxide catalyst at four temperatures. As expected the gasification rate increases with temperature, although there is little difference between our standard 640{degree}C and 680{degree}C. Figure 3 investigates the effect of partial pressure of water on the conversion using an Ill {number_sign}6 char (prepared in the presence of 0.5% caustic) and a K-Ca-Co oxide catalyst at 640{degree}C. There is an improvement in rate with increasing water partial pressure.
[关键词]:01 COAL, LIGNITE, AND PEAT; CHARS; COAL GASIFICATION; CATALYSTS; PROGRESS REPORT; POTASSIUM OXIDES; CALCIUM OXIDES; NICKEL OXIDES; COBALT OXIDES; CATALYTIC EFFECTS; SODIUM HYDROXIDES; STEAM; PARTIAL PRESSURE; TEMPERATURE DEPENDENCE
[出版时间]:1993 Aug 01
[出版年份]:1993
[报告号]:LBL--34250
[合同号]:AC03-76SF00098
[主办机构]:USDOE, Washington, DC (United States)
[来源]:Technical Report
[来源关系]:Other Information: PBD: [1993]
[覆盖领域]:Quarterly
[其他获取途径]:OSTI; NTIS; GPO Dep.
[国别]:United States
[总页数]:22


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[唯一标识符]:CDSTIC.ISTP.1426059
[文献来源]:科学技术会议录索引(ISTP)
[文献类型]:科技会议
[标题]:Multi-Code TDMA (MC-TDMA) for Multimedia Satellite-Communications
[作者]:R Digirolamo;T Lengoc
[出版单位]:I E E ENew York
[ISSN_ISBN]:0-7803-3926-6
[会议名称]:1997 IEEE International Conference on Communications - Towards the Knowledge Millennium (ICC 97),Montreal, Canada,June 8-12, 1997
[来源]:ICC'97: 1997 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS - TOWARDS THE KNOWLEDGE MILLENNIUM, CONFERENCE RECORD - VOLS 1-3,pp 684-688
[编辑者]:CIEEE
[主办单位]:IEEE Commun Soc
[地址]:R Digirolamo,Concordia_Univ, Dept Elect & Comp Engn, 1455 Maisonneuve Blvd W, Montreal, PQ H3G 1M8, Canada
[专业领域]:Telecommunications
[文献类型]:科技报告
[标题]:Inventory Management.
[作者]:hax, arnoldo c. candea,dan i.
[机构]:Massachusetts Inst of Tech Cambridge Operations Research Center
[关键词]:inventory control,systems management,decision making,industrial production,monitoring,mathematical models,costs,stockpiles,quantity,forecasting,management information systems,statistical analysis,operations research,ntisdodxa
[出版年份]:1980
[报告号]:Rept no. TR-168
[报告时间]:Nov 79,
[页码]:199p
[馆藏索取号]:AD-A077562
[总页数]:204



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