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碳纳米管作为低碳醇合成CoMo-基催化剂的高效促进剂

期刊名称：厦门大学学报 (自然科学版), 2006, 45(4): 445-449
时间：0
分类：O643[理学—物理化学;理学—化学]
作者机构：[1]厦门大学化学化工学院固体表面物理化学国家重点实验室,福建厦门361005
相关基金：国家重点基础研究发展规划“973”项目（2005CB221400）,国家自然科学基金项目（20473063和20590364）共同资助
相关项目：能源发展中的若干关键化学科学基础问题

关键词：多壁碳纳米管促进剂, Co-Mo-K氧化物基催化剂, CO加氢, 低碳醇合成, Carbon-nanotube promoter, Co-Mo-K oxide-based catalyst, CO hydrogenation, higher alcohol synthesis

中文摘要：

用自行制备的多壁碳纳米管（MWCNTs）作为促进剂，制备一类共沉淀型MWCNTs促进Co-Mo-K氧化物基催化剂．实验发现，该类催化剂对CO加氢生成低碳醇显示出高的转化活性和生成C2-9-醇（尤其辛醇）优良的选择性；在所制备的Co1Mo1K0．05-12％MWCNTs催化剂上，5．0MPa、563K、V（H2）／V（CO）／V（N2）=60／30／10、GHSV=8000mLSTP·h^-1·g-cat^-1的反应条件下，C1～9-醇和DME的时空产率合计达308mg·h^-1·g-cat^-1，是相同反应条件下不含碳纳米管的对应物（Co1Mo1K0．05）上这个值（199mg·h^-·g-cat^-1）的1．54倍；水煤气变换副反应明显地受到抑制；产物碳链偏离Sehulz-Flory分布律；在总醇醚产物中，C2～9-醇＋DME的质量百分数合计约占95％，展示其作为油品添加剂或代用合成燃料的潜在应用前景．

英文摘要：

With the homemade multi-walled carbon nanotubes （MWCNTs） as promoter,a series of MWCNT-promoted Co-Mo-K oxide-based catalysts,denoted as CoiMojKk-x% （mass percentage）MWCNTs, were prepared by co-precipitation method. The catalysts display excellent performance for highly effective and selective formation of the C2＋-alcohols, especially C8-alcohols, from the syngas. Under the reaction conditions of 5.0 MPa,563 K,V（H2）/V（CO）/V（N2）=60/30/10,GHSV=8 000 mLSTP·h^-1·g-cat^-1, the observed space-time-yield （STY） of C1-9-alcohols over the prepared Co1Mo1K0.05-12 %MWCNTs catalyst reached 308 mg·h^-1·g-cat^-1 ,which was 1.54 times as high as that （199 mg·h^-1·g-cat^-1 ） of the MWCNT-free counterpart,Co1Mo1K0.05 ,at the same conditions; C8-alcohols became the predominant product of the CO hydrogenation, with the carbon-based selectivity reaching 23. 5C%. The mass% of C2-9 alcohols and DME combined reach 95 % in the total oxygenated products obtained at 563 K,a good prospect for such oxygenated products to be used as gasoline additives or even alternative automobile fuels. It is also experimentally found that the water-gas-shift side-reaction was inhibited to a great extent over the MWCNT-promoted Co-Mo-K catalysts.

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