To decompose carbon dioxide, which is a representative greenhouse gas, a 3-phase gliding arc plasmatron device was designed and manufactured to examine the decomposition of CO2, either alone or in the presence of methane with and without water vapour. The changes in the amount of carbon dioxide feed rate, the methane to carbon dioxide ratio, the steam to carbon dioxide ratio, and the methane to steam ratio were used as the parameters. The carbon dioxide conversion rate, energy decomposition efficiency (EDE), carbon monoxide and hydrogen selectivity, and produced gas concentration were also investigated. The maximum values of the carbon dioxide conversion rate, which is a key indicator of carbon dioxide decomposition, in different cases were compared. The maximum carbon dioxide conversion rate was 12.3 % when pure carbon dioxide was supplied; 34.5 % when methane was injected as a reforming additive; 7.8 % when steam was injected as a reforming additive; and 43 % when methane and steam were injected together. Therefore, this could be explained that the methane-and-steam injection showed the highest carbon dioxide decomposition, showing low EDE as 0.01 L/min W. Furthermore, the plasma produced carbon-black was compared with commercial carbon-black chemicals through Raman spectroscopy, surface area measurement and scanning electron microscopy. It was found that the carbon-black that was produced in this study has the high conductivity and large specific surface area. Our product makes it suitable for special electric materials and secondary battery materials applications. 相似文献
The removal of isoleucine from valine has been a key issue in the stage of valine crystallization, which is the final step in the valine production process in industry. To address this issue, a three‐zone simulated moving‐bed (SMB) process for the separation of valine and isoleucine has been developed previously. However, the previous process, which was based on a classical port‐location mode, had some limitations in throughput and valine product concentration. In this study, a three‐zone SMB process based on a modified port‐location mode was applied to the separation of valine and isoleucine for the purpose of making a marked improvement in throughput and valine product concentration. Computer simulations and a lab‐scale process experiment showed that the modified three‐zone SMB for valine separation led to >65% higher throughput and >160% higher valine concentration compared to the previous three‐zone SMB for the same separation. 相似文献
A novel strategy was devised for colorimetric analysis of the products of the polymerase chain reaction (PCR). The method takes advantage of simultaneous amplification of a horseradish peroxidase-mimicking DNAzyme (HRPzyme) during the PCR process. It is performed using a DNA specific forward primer and a universal reverse primer containing a complementary HRPzyme sequence. The double-strand PCR products, which include the HRPzyme sequence, are treated with a mixture of hemin and TMB (3,3′,5,5′–tetramethylbenzidine) in the presence of hydrogen peroxide. The resulting HRPzyme/hemin complex then promotes a peroxidase mimicking reaction, which produces the blue colored oxidized TMB. This colorimetric method can be more easily performed than previously developed gel based detection procedures and, as a result, can be conveniently applied to the specific and sensitive colorimetric analysis of DNA sequences arising from pathogenic bacteria. The potentially broad applicability of the new method has been demonstrated by its use in the identification of the 16s rDNA of Salmonella Typhimurium.
Polymerizations of methyl acrylate (MA) and (DL)-α-methyl-benzyl methacrylate (MBMA) with binary initiator system of cobaltocene [Co(C5H5)2] and bis(ethyl acetoacetato)copper(II) [Cu(eacac)2] were studied in acetonitrile at 25°C. The molecular weight of the polymers obtained by MA was found to increase with time in the early stage of polymerization. Although MBMA was also polymerized by this system, asymmetric selective polymerization was not induced in the presence of (-)-sparteine. The synthesis of the block copolymer of MA and MBMA was attempted by using this initiator system. The block copolymer was obtained in 90% yield in the polymerization of MBMA with a polymer radical which prepared from MA with this system for 1 day. The yield of the block copolymer depended on the prepolymeriza-tion time of MA by this system. The resulting block copolymer was characterized by IR, 1H-NMR, and gel-permeation chromatography. 相似文献