排序方式: 共有54条查询结果,搜索用时 203 毫秒
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纳米镍铈/三氧化铝催化剂的表征及加氢性能 总被引:6,自引:0,他引:6
采用氢电弧等离子法制备了具有储氢特性的纳米镍铈粒子,并制备出纳米NiCe/Al_2O_3催化剂,通过透射电镜(TEM),扫描电镜(SEM),X射线衍射(XRD)分析发现,纳米NiCe粒子为类球状多面体.Ce物种存在于粒子表面层中;纳米NiCe/Al_2O_3粒子呈壳型蜂窝状结构,粘附在载体氧化铝表面;纳米NiCe与载体氧化铝作用较弱.在裂解汽油一段加氢反应中,纳米NiCe/Al_2O_3催化剂显示出较高的活性和选择性. 相似文献
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A method based on PCR amplification of the 16S rRNA gene (rDNA)-23S rDNA intergenic spacer regions (ISR) was developed for the identification of species within the novel group hydrogen-producing anaerobes. The sizes of the PCR products varied from 1264 to 398 bp. Strain of isolate Rennanqilyf 3 was characterized as having products of 1262,398,638,437 and 436 bp. The isolate Rennanqilyf 1 had product of 1264 bp. The isolate Rennanqilyf 13 had products of 1261,579 and 485 bp. Of the 3 species of the novel group hydrogen-producing anaerobes examined, no one was indistinguishable. Two environmental isolates were identified as hydrogen-producing bacteria, which were new species in present taxon. Rennanqilyf 3 could not be associated with any Clostridium sp. studied. Rennanqilyf 1 could be classified into Clostridium genus. The combination between 16S rDNA equencing and length polymorphisms of IRS in 16S-23S rDNA is a better method for determining species of the hydrogen-producing bacteria. 相似文献
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铁氧化物对木材防腐剂CCA中重金属的去除研究 总被引:1,自引:0,他引:1
以木材防腐剂CCA中的重金属离子铬、砷、铜为研究对象,讨论了3种重金属离子在水合铁氧化物上的相互作用机理,评价了该铁氧化物对3种重金属离子的吸附去除效果,并探讨了腐殖酸对铁氧化物去除3种重金属离子的影响.结果表明,铁氧化物对单一砷和铬的去除率均随溶液pH的增加而降低,对单一铜的去除率随溶液pH增加而增加;砷和铬在铁氧化物上的吸附相互抑制;砷和铬均促进铁氧化物对铜的去除,铜也促进铁氧化物对砷和铬的去除;在腐殖酸存在下,铁氧化物对铬、砷、铜的去除效果均显著降低.竞争性吸附、协同吸附、沉淀作用、络合作用等机理被用来解释以上试验现象. 相似文献
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采用"原位合成模板法"以硅酸为模板、硝酸钴为钴源,制备了中孔Co3O4材料,研究了模板和硝酸钴的质量比对所制得的中孔Co3O4材料的微观结构和电化学性能的影响.用N2等温吸附—脱附和X线衍射测试了其微观结构.结果表明,随着模板质量比的增加,制备得到的Co3O4材料的比表面积增加,中孔结构越明显,结晶性逐渐降低.在6 mol/L氢氧化钾电解液中测试了其电化学性能,最优质量比制得的样品在5 mV/s扫描速率下的比电容达329 F/g.即使在较高扫描速率下,该质量比的中孔Co3O4比电容依然具有很好的保持性. 相似文献