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Citation: Lu Yun, Liu Danchu, Zheng Shengan. STUDIES ON THE SYNTHESIS OF ETHANOL FROM CO HYDROGENATION WITH THE TRANSIENT RESPONSE TECHNIQUE Ⅱ. THE REACTION MECHANISM OVER MODIFIED Rh/Al₂O₃ CATALYSTS[J]. Acta Physico-Chimica Sinica, ;1988, 4(04): 361-365. doi: 10.3866/PKU.WHXB19880407 shu

STUDIES ON THE SYNTHESIS OF ETHANOL FROM CO HYDROGENATION WITH THE TRANSIENT RESPONSE TECHNIQUE Ⅱ. THE REACTION MECHANISM OVER MODIFIED Rh/Al₂O₃ CATALYSTS

1.
Department of Chemistry; University of Fudan; Shanghai

Received Date: 11 October 1986
Available Online: 15 August 1988

In the present paper the surface reaction mechanism with that the CO hydrogenation will proceed to ethanol is investigated by the transient response method using a quadrupole mass spectrometer under atmospheric CO-H_2 over Rh/Al_2O_3 and K doped Rh/Al_2O_3 catalysts.
According to the experimental results, it is found that: 1. the presence of K causes a marked increase in the steadystate rate and selectivity for ethanol synthesis; 2. the formation of ethanol depends on the surface adjacent intermediates and is independent of the concentration of CO or H_2 in the gas phase, i.e. the results favor the condensation mechanism to the insertion mechanism.
A mechanism of ethanol synthesis on the modified Rh/Al_2O_3 has been proposed and a set of rate constants of all elementary steps are calculated by Marquardt nonlinear optimization technique and Rung-Kutta-Gill numerical value integration method.
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STUDIES ON THE SYNTHESIS OF ETHANOL FROM CO HYDROGENATION WITH THE TRANSIENT RESPONSE TECHNIQUE Ⅱ. THE REACTION MECHANISM OVER MODIFIED Rh/Al2O3 CATALYSTS

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STUDIES ON THE SYNTHESIS OF ETHANOL FROM CO HYDROGENATION WITH THE TRANSIENT RESPONSE TECHNIQUE Ⅱ. THE REACTION MECHANISM OVER MODIFIED Rh/Al₂O₃ CATALYSTS