Enhanced Activity and Selectivity of Fischer-Tropsch Synthesis Catalysts in Water/Oil Emulsions

被引：39

作者：

Shi, Dachuan ^{[1
,2
]}

Faria, Jimmy ^{[3
]}

Pham, Tu N. ^{[1
,2
]}

Resasco, Daniel E. ^{[1
,2
]}

机构：

[1] Univ Oklahoma, Sch Chem Biol & Mat Engn, Norman, OK 73019 USA

[2] Univ Oklahoma, Ctr Interfacial React Engn CIRE, Norman, OK 73019 USA

[3] Abengoa Res SL, Seville 41014, Spain

来源：

ACS CATALYSIS | 2014年 / 4卷 / 06期

关键词：

Fischer-Tropsch synthesis; emulsion; carbon nanotubes; nanohybrids; water; CO HYDROGENATION; CARBON-MONOXIDE; KINETICS; COBALT; IRON; COADSORPTION; RUTHENIUM; MECHANISM; SILICA; DISSOCIATION;

D O I：

10.1021/cs500040n

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Amphiphilic nanohybrid catalysts (Ru particles supported on carbon nanotube-metal oxide hybrids) enable the formation of water-in-oil emulsions and have a positive influence on the Fischer-Tropsch synthesis (FTS) activity and selectivity to desirable products in comparison with those obtained in single-phase solvents under the same reaction conditions. The reaction experiments were conducted at 473 K in a batch reactor that uses H-2/CO syngas as a feed at 2.0-3.5 molar ratio and 4136.85 kPa total pressure. One of the main effects observed when using the biphasic mixture instead of a single solvent is the spontaneous separation of products by solubility differences, which affect mass-transfer-dependent secondary reactions. Another positive effect of using the biphasic system arises from the enhanced FTS activity observed in the presence of condensed aqueous phase. Finally, the presence of an emulsion seems to improve the C-1/C5+ product balance, which can be explained by a dual-site model recently proposed in the literature.

引用

页码：1944 / 1952

页数：9

共 46 条

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