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hydrogen conversion
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     HYDROGEN CONVERSION OF PENTOSES WITH Biohydrogenbacterium R3 sp. nov. AND H_2-PRODUCING MECHANISM
     一株发酵产氢细菌对戊糖的氢气转换及产氢机理
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     On Conversion
     论转化构词法
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     Repair of Conversion Furnace Tubes in Hydrogen Plants
     制氢转化炉炉管的修复
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     Conversion of Hydrogen Chloride to Chlorine by Catalytic Oxidation
     氯化氢催化氧化制氯气工艺
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     Hydrogen in the Future
     氢能在可持续发展战略中的应用前景展望
     conversion of flavanones.
     黄烷酮的转化.
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  hydrogen conversion
These samples were characterised by nitrogen and hydrogen adsorption, X-ray diffraction, FTIR, temperature programmed reduction, transmission electron microscopy and catalytic activity in butane-hydrogen conversion.
      
These samples were characterised by nitrogen and hydrogen adsorption, X-ray diffraction, FTIR, temperature programmed reduction, transmission electron microscopy and catalytic activity in butane-hydrogen conversion.
      
Trace carbon monoxide and hydrogen conversion prior to cryogenic distillation of air
      
The transformation of a dispersed high-temperature superconductor from its normal to superconducting state was found to result in the loss of its catalytic properties in orhto-para-hydrogen conversion.
      
The activity of Group IV-VI transition metal sulfides in p-hydrogen conversion shows an inverse dependence on their bond ionicity.
      
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The mechanisms of nitrogenasemediated and hydrogenasedependent hydrogen production are reviewed.Recent advance in the photoinduced cyclic electrontransfer is described.The principles of ATP synthesis drived by the protonsmotive force and hydrogen production catalyzed by nitrogenase are also described.The effects of several major limiting factors,including light sources,light intensity,light/dark cycle,O2,NH+4,N2,hydrogen donors concentration,pH,medium composition of the preculture,preculture time and...

The mechanisms of nitrogenasemediated and hydrogenasedependent hydrogen production are reviewed.Recent advance in the photoinduced cyclic electrontransfer is described.The principles of ATP synthesis drived by the protonsmotive force and hydrogen production catalyzed by nitrogenase are also described.The effects of several major limiting factors,including light sources,light intensity,light/dark cycle,O2,NH+4,N2,hydrogen donors concentration,pH,medium composition of the preculture,preculture time and inoculation volume,on the hydrogen production are discussed.From the practical point of view,the immobilized cell technology have been examined to promote hydrogen yields and stability of the hydrogenproducing system,the methods for fedbatch culture and mixed culture are currently being investigated to enhance the hydrogenproducing capabilities and feasibility of the photoproduction process from organic wastewater,the advanced technology of genetic manipulation is now under examination to improve the efficiency of light energy to hydrogen conversion.The comments on the presently existing problems of the different hydrogen production approaches are also discussed.The future prospects of the photoproduction hydrogen biotechnology by photosynthetic bacteria are estimated.

阐述了固氮酶催化的光合放氢和氢酶催化的黑暗厌氧产氢机制,描述了光合细菌原初反应的微观反应动力学以及电子定向转移和质子转位耦联驱动的三磷酸腺苷合成机制与固氮产氢过程。讨论了影响光合放氢的主要因素,如光、氧气、菌株特性、氢供体和氮源等。介绍了固定化、混合培养和重复分批培养等实用化技术和遗传工程技术在光合细菌产氢研究中的应用现状,并就存在的问题进行了讨论。最后对光合制氢技术的发展趋势和应用前景进行了评述。

The catalytic combustion reaction of hydrogen/air mixture was studied in a microchannel reactor. The effects of operation conditions on reactor behavior were investigated in detail by using both mathematic modeling and experiment work. Explosive mixtures of hydrogen/air [3%(mol)—15%(mol)] were safely handled in this reactor. The results showed that catalytic combustion reaction can be operated at high space velocity, isothermal and kinetic controlled regimes. Under the conditions of inlet hydrogen concentration...

The catalytic combustion reaction of hydrogen/air mixture was studied in a microchannel reactor. The effects of operation conditions on reactor behavior were investigated in detail by using both mathematic modeling and experiment work. Explosive mixtures of hydrogen/air [3%(mol)—15%(mol)] were safely handled in this reactor. The results showed that catalytic combustion reaction can be operated at high space velocity, isothermal and kinetic controlled regimes. Under the conditions of inlet hydrogen concentration of 8%(mol),reaction temperature of 150℃,space velocity of 10 6h -1 ,hydrogen conversion was still higher than 90%.

在微尺度化学反应器内对氢气 /空气催化燃烧反应进行了研究 ,考察了操作条件对反应行为的影响 ,并建立相应的数学模型 ,同时也对该类反应器应用于强放热反应过程的动力学研究进行初步的探讨 .实验过程中H2 入口浓度为 3% (mol)~ 15 % (mol) ,结果表明微通道反应器可使处于爆炸极限内的氢氧催化燃烧反应在高空速、低压降、等温及动力学控制区内安全地进行 .在H2 入口浓度 8% (mol)、反应温度 15 0℃、空速 1 0× 10 6h-1条件下 ,转化率高达 90 % .

Hydrogen deriving from bio-wastes or unused biomass is one of the most promising alternative energy carrier as a sustainable technology in the future.Dark microbial fermentation for the conversion of biomass to biohydrogen has being paid much attention in the world for its advantages of high hydrogen production rate,feasibility in the reactor design and process control,and possibility in integration with waste treatment.Progresses in dark fermentation for bio-hydrogen production achieved in recent years were...

Hydrogen deriving from bio-wastes or unused biomass is one of the most promising alternative energy carrier as a sustainable technology in the future.Dark microbial fermentation for the conversion of biomass to biohydrogen has being paid much attention in the world for its advantages of high hydrogen production rate,feasibility in the reactor design and process control,and possibility in integration with waste treatment.Progresses in dark fermentation for bio-hydrogen production achieved in recent years were reviewed in the present paper.In addition to the deeper understanding of the traditional hydrogen-producing bacteria,tools of modern biotechnology and bioinformatics were gradually adopted for the construction of the database of hydrogen-producing bacteria.In the respect of hydrogenase,not only were the related gene identification and the functional analysis important,but also was genetic engineering for improving hydrogenase paid attention.Concerning the combination of biohydrogen production with the waste treatment,many studies had focused on the effects of operating conditions and process optimization.Various wastes had been used for hydrogen conversion and a series of bio-reactors been designed.In addition,the feasibility and economic evaluation of the existing bio-hydrogen process was also discussed in the paper.Finally,new approach for bio-hydrogen in the dark fermentation was indicated.

综述了近年来发酵生物制氢领域的研究进展。在菌种方面,除了对现有产氢菌种的深入研究外,还采用生物学,分子生物学及生物信息学手段建立产氢菌种库;在氢酶的研究方面,已逐步从基因确定、功能研究拓展到基因工程构建高效产氢菌研究;而在与废弃生物质处理相结合的反应过程方面,研究主要集中在利用不同种类的废弃物的产氢和高效产氢反应器上。此外,还初步总结了目前对发酵制氢可行性和经济性的评价,并对其发展方向提出了新的看法。

 
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