In-situ drift spectroscopy in a continuous recycle reactor: a versatile tool for catalytic process research
Diffuse Reflectance IR Fourier-Transform (DRIFT) spectroscopy is an increasingly popular technique in catalysis research as it permits in situ observation of the reactor bed in powd. or granular form. However, DRIFTS in its conventional form suffers from temp.-gradient problems. One soln. is to couple the DRIFTS cell with a continuous recycle flow system. The value of such an arrangement is illustrated via studies of the kinetics and mechanism of CO2 methanation over Ru/TiO2 under transient and steady-state conditions. Metal-absorbed CO is identified as the main reaction intermediate through titrn. to CH4 in transient hydrogenation. The COad is probably supplied via rapid establishment of the reverse water gas shift equil.: H2 + CO2 -> COad + H2O involving adsorbed formate intermediate(s). [on SciFinder (R)]
Keywords: Adsorbed substances (carbon monoxide on titania supported ruthenium ; IR of); Kinetics; Reaction mechanism (in continuous recycle reactor ; use of in situ DRIFT spectroscopy for detn. of); Methanation (of carbon dioxide in continuous recycle reactor ; IR d ; drift in situ continuous recycle reactor; catalytic process in situ drift
Physical Organic Chemistry
Paul Scherrer Inst.,Villigen,Switz.
written in English.
630-08-0 (Carbon monoxide) Role: PRP (Properties) (absorption of, on titania supported ruthenium and intermediacy of, in methanation of carbon dioxide); 7440-18-8 (Ruthenium); 13463-67-7 (Titania) Role: CAT (Catalyst use), USES (Uses) (catalysts contg., for methanation of carbon dioxide, kinetics and mechanism with); 74-82-8P (Methane) Role: FORM (Formation, nonpreparative), PREP (Preparation) (formation of, from redn. of carbon dioxide over titania supported ruthenium); 124-38-9 (Carbon dioxide) Role: RCT (Reactant), RACT (Reactant or reagent) (methanation of, over titania supported ruthenium, kinetics and mechanism of); 630-08-0; 7732-18-5 Role: PRP (Properties) (water gas shift reaction, reverse, in methanation of carbon dioxide over titania supported ruthenium)
Record created on 2006-04-18, modified on 2016-08-08