A novel risedronic acid-modified Nieuwland catalyst for acetylene dimerization.

Nieuwland catalyst (NC) was modified with different phosphonic acids (P x) and evaluated for their acetylene dimerization activity in monovinyl acetylene (MVA) production. Nearly 49.2% of acetylene conversion and 80.3% of MVA selectivity were obtained in 5 mol% risedronic acid (P 2)-modified NC under an acetylene-gas space velocity of 105 h−1 at 80 °C, which was 17.8% higher than the yield of the control NC. The characterization results of NC and P 2 –NC indicated that the addition of P 2 effectively enhanced the stability of the Cu ions and inhibited oxidation of the active component Cu+, improving their catalytic activity and long-term stability. Unlabelled Image • Phosphonic acids modification Nieuwland is firstly used for acetylene dimerization. • Risedronic acid (P 2)-modified Nieuwland catalyst showed excellent performance and long-term stability. • Addition of P 2 effectively enhances the stability of the Cu ions and inhibits oxidation of the active component Cu+. [ABSTRACT FROM AUTHOR]