Syngas conversion

For the experiment of Figure 11.1 the degree of syngas conversion was kept at a low level, 0.2-0.3, so that the partial pressures of 1-alkenes also remained low. 

For an accurate representation of the carbon number distribution in the case of elevated pco and a high degree of syngas conversion, the bimodal model must... 

Conversly, the Fe3(C0)12 NaY adduct is active for syngas conversion. A non-decomposed sample exhibits a significant activity at 230°C whereas the catalytic efficiency for the decar-bonylated one already appears at 200°C. Infrared experiments show an increase in the stability of the Fe3(C0)- 2 units upon thermal treatment under CO atmosphere so that total carbon monoxide evolution only takes place at 230°C thus suggesting that the catalyst is certainly not Fe3(C0)- 2. This cluster has to be transformed into higher nuclearity species which bind less strongly with carbon monoxide upon CO re-adsorption (1 7). 

The CpFe(C0)2 2-NaY adduct is active for syngas conversion. Under the standard conditions the CO conversion is quite similar to that observed for Feo(CO)-j 2-NaY (Table k). However hydrogen conversion is higher and this is reflected in the chain-length distribution which shows a better selectivity for light hydrocarbons (Figure 3). 

For ruthenium catalysts without shift activity, the stoichiometric requirement for syngas conversion is two moles of per mole of CO, according to Equation (I). However, the H2/C0 usage ratio can be less than 2 when the catalyst has shift activity (Equation II). 

Effect of Ruthenium Loading Two ruthenium concentrations (0.5% and 1.5%) were used to study the effect of ruthenium loading on syngas conversion over physically mixed Ru/Al-O-//ZSM-5 catalysts. The results are shown in Table II. The formation of C +C2 was greatly reduced from 40% w th 1.5% Ru to 25% with 0. % Ru. On the other hand, the higher ruthenium loading gave a coproduct of reduced end point (Ex. 2A and 2B). As expected, no difference in aromatics production was observed. 

The variations in syngas conversion and C +C2 selectively could be due to the difference in ruthenium surface areas as a result of different preparations. 

SYNGAS CONVERSION OVER RUTHENIUM/ZEOLITE CATALYSTS AT 51 atm,... 

EFFECT OF METHOD OF CATALYST PREPARATION ON SYNGAS CONVERSION OVER... 

Figure 1. Effect of pressure on syngas conversion over 5% Ru(as Ru02)/ZSM-5 (294°C, GHSV = 480, and H2/CO = 2/1)...

New technologies that operate closer to downstream process requirements are needed. This means technologies that operate within the ranges of gas turbines and syngas conversion processes (i.e., 300 to 700°F). 

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