Probe molecule studies: Active species in alcohol synthesis

The goal of this research is to develop a better understanding of the mechanisms of formation of alcohols and other oxygenates from syngas over supported catalysts. Probe molecules are added in situ during the reaction to help delineate reaction pathways and identify reaction intermediate species. The key of our study is to investigate how the species generated by these probe molecules interact with surface species present during oxygenate formation. The catalysts chosen for tills investigation is Co/Cu/ZnO/Al[sub 2]O[sub 3]. Detailed motivations for studying this system as well as using CH[sub 3]NO[sub 2] as the probe molecule were given in a previous report. (A) Pretreatment of a Co(O%)/Cu/ZnO/Al[sub 2]O[sub 3] to be used as a base catalyst was carried out. (B) XRD experiments were carried out with the calcined and reduced samples of the O%-Co, 5%-Co and 10%-Co catalysts. (C) Temperature programmed reduction was performed with the O%-Co, 5%-Co and 10%-Co catalysts. (D) CO hydrogenation under the same conditions used for the 5%-Co and 10%-Co catalysts was conducted over the Co(O%)/Cu/ZnO/Al[sub 2]O[sub 3] catalyst. (E) CH[sub 3]NO[sub 2] addition to the steady state reaction of CO hydrogenation was conducted over both the O%-Co and the 10%-Co catalysts

Heraldo de Menorca : diario monárquico: Año II Número 334 - 1917 Mayo 15

The goal of this research is to develop a better understanding of the mechanisms of formation of alcohols and other oxygenates from syngas over supported catalysts. Probe molecules will be added in situ during the reaction to help delineate reaction pathways and identify reaction intermediate species. The key of our study is to investigate how the species generated by these probe molecules interact with surface species present during oxygenate formation

Probe molecule studies: Active species in alcohol synthesis

The goal of this research is to develop a better understanding of the mechanisms of formation of alcohols and other oxygenates from syngas over supported catalysts. Different probe molecules are planned to add in situ during the reaction to help delineate reaction path ways and identify reaction intermediate species. The key of our study is to investigate how the species generated by these probe molecules interact with surface species present during oxygenate formation. CO hydrogenation reactions are being carried out in both the presence and the absence of the probe molecule under conditions which favor the formation of oxygenated products. A reaction and analysis system capable of carrying out the experiments for this study has been set up, modified, and tested. First, the commercially important Cu/ZnO/Al203 catalyst for methanol synthesis is being studied. Other catalysts, such as Pd and Rh with and without alkali or oxide promoters which are known to produce oxygenates from syngas, are being prepared and characterized for this study. Based on the observation of a previous study that nitromethane is an effective source of CH2 groups, it will be one of the primary probe molecules to be studied. In addition, acetylenic compounds are primary choices for this study also. These compounds were found by other workers to be effective as a source of chain initiators. 2 figs

Probe molecule studies: Active species in alcohol synthesis

Goal is to understand the mechanisms of formation of alcohols and other oxygenates from syngas over supported catalysts. Work during this period: BET surface areas and XRD patterns of Cu/ZnO/Al[sub 2]O[sub 3] and Co(5%)/Cu/ZnO/Al[sub 2]O[sub 3] suggest that Co did not change the structure. CO was hydrogenated over 10% Co catalyst. C[sub 2]H[sub 4] additions increased the isopropanol and decreased the methanol production. Blank runs with H[sub 2]/He/CH[sub 3]OH/C[sub 2]H[sub 4] showed that C[sub 2]H[sub 4] does not react with CH[sub 3]OH