Mild and highly selective hydrogenation of cyclohexyl acetate to cyclohexanol over Cu(i) coordinated amino-functionalized poly(ionic liquid)s

Abstract

A novel efficient and economical process of cyclohexanol production based on cyclohexene esterification-hydrogenation has become the hotspot in recent years. Wherein hydrogenation of cyclohexyl acetate (CHA) derived from the esterification...

Efficient hydrogenation of cyclohexyl acetate to cyclohexanol with Cu–Zr catalysts

“…Recently, the hydrogenation of acetic acid-derived cyclohexyl acetate (CHA) to yield CHOL with Cu-based catalysts has been proved be an alternative and effective route. [4][5][6][7][8] For instance, Zong and coworkers demonstrated a heterogeneous Cu 1 Zn 1 Si 2 La 0.1 catalyst, achieving 99.5% conversion and 99.7% selectivity to CHOL without deactivation during the 1000 h time-on-stream test. 4 Nevertheless, they did not detail the investigations about the affecting factors for the conversion of CHA and the selectivity to CHOL.…”

“…7 In another case, Guang et al designed a Cu(I) catalyst coordinated with amino-functionalized poly(ionic liquid)s (PILs-Cu(I)) for the hydrogenation of CHA to CHOL, which afforded 95.6% CHA conversion, and 96.6% selectivity to CHOL, with 97.0% selectivity to ethanol at 80 1C and 2 MPa of H 2 . 8 However, a common feature in the reported Cu-based catalysts is that they all required three or more components to obtain high CHA conversion and high CHOL selectivity, [4][5][6] which makes it difficult to identify the real role of each component. Moreover, rare earth metals or poly(ionic liquid)s were adopted to enhance the catalytic behaviors.…”

“…Recently, the hydrogenation of acetic acid-derived cyclohexyl acetate (CHA) to yield CHOL with Cu-based catalysts has been proved be an alternative and effective route. 4–8…”

“…7 In another case, Guang et al designed a Cu( i ) catalyst coordinated with amino-functionalized poly(ionic liquid)s (PILs-Cu( i )) for the hydrogenation of CHA to CHOL, which afforded 95.6% CHA conversion, and 96.6% selectivity to CHOL, with 97.0% selectivity to ethanol at 80 °C and 2 MPa of H 2 . 8…”