1989
DOI: 10.1016/0021-9517(89)90311-4
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The effect of catalyst preparation on the performance of alumina-supported ruthenium catalysts I. The impact of catalytic precursor on particle size and catalytic activity

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Cited by 46 publications
(7 citation statements)
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“…The initial CO conversion rate was determined to be 28.1 mol of CO (mol of Ru) −1 h –1 , which corresponds to a turnover frequency (TOF) of 0.0282 s –1 , assuming a Ru dispersion based on TEM observations of 0.33. These values are in the upper range among those reported for Ru catalysts. Catalyst 2, with much smaller and uniform particles (1–2 nm), had a much higher activity of 73.9 mol of CO (mol of Ru) −1 h –1 but with a corresponding initial TOF of 0.0149 s –1 .…”
Section: Resultsmentioning
confidence: 65%
“…The initial CO conversion rate was determined to be 28.1 mol of CO (mol of Ru) −1 h –1 , which corresponds to a turnover frequency (TOF) of 0.0282 s –1 , assuming a Ru dispersion based on TEM observations of 0.33. These values are in the upper range among those reported for Ru catalysts. Catalyst 2, with much smaller and uniform particles (1–2 nm), had a much higher activity of 73.9 mol of CO (mol of Ru) −1 h –1 but with a corresponding initial TOF of 0.0149 s –1 .…”
Section: Resultsmentioning
confidence: 65%
“…In this system, the metal dispersion and the partitioning between surface Ni and Ni incorporated in the support depended also on the crystallinity of the support, a factor which determines its dissolution properties.229 On the other hand, the dispersion of RU/AI2O3 prepared by incipient wetness was relatively unaffected by increases in weight loading because the ruthenium salt affords a better buffering of the (acidic) impregnation solution. 230 It was proposed that dissolution of alumina facilitates continuous generation of anchoring sites and thus higher amounts of salt precursor can be effectively dispersed by incipient wetness231 as depicted in Figure 7.…”
Section: Homogeneous Deposition-precipitationmentioning
confidence: 99%
“…It is also proposed that the surface carbon species formed by hydrogen-assisted CO dissociation participate in the FT synthesis reaction and as precursor for the species that causes catalyst deactivation. 11,71,72 Recent theoretical studies suggest, however, that the CO dissociation ability is favored on couples of atoms on monoatomic steps being the key requirement for Ru to develop a good FTS catalyst, 73,74 followed by hydrogenation and coupling of CH x fragments 75 or CO insertion. 74 Experimental studies have shown that water presents a positive effect on the reaction rate and selectivity, in part due to its ability to remove surface carbon atoms, 4 and in part because Ru particles around 8 nm perform better than smaller particles for FTS.…”
Section: Discussionmentioning
confidence: 99%