The role of Mn and Li promoters in supported rhodium catalysts in the formation of acetic acid and acetaldehyde

✍ Scribed by Hong-Yuan Luo; Pei-Zi Lin; Shui-Bo Xie; Huan-Wen Zhou; Chang-Hai Xu; Shi-Yu Huang; Li-Wu Lin; Dong-Bai Liang; Pin-Liang Yin; Qin Xin

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 817 KB
• Volume: 122
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(97)00012-5

✦ Synopsis

Rh-Mn-Li/SiO, catalysts consisting of 1 wt% Rh for the synthesis of C, oxygenates from syngas were studied by CO + H, reaction and characterized by TPR, H,-TPD, ESR and IR techniques. The Rh-Mn-Li/SiO, catalysts, which showed a good selectivity for the formation of acetic acid and acetaldehyde, have been found to be quite different from the Rh-V/SiO, catalysts reported previously, which mainly promoted the formation of ethanol. Comparing with the Rh-V/SiO, catalysts, the Rh-Mn-Li/SiO, exhibited lower capacity of hydrogen adsorption, lower hydrogenation activity, more intense interaction of the manganese oxide with the Rh component, and more intense bands of twin-adsorbed CO (i.e. more Rh' + ion). The good selectivity of the Rh-Mn-Li/SiO, catalysts towards acetaldehyde and acetic acid formation were correlated to these features. 0 1997 Elsevier Science B.V.