Nitrogen and phosphorus co-doped activated carbon induces high density Cu+ active center for acetylene hydrochlorination

Abstract

This work aims to solve the problems of low reaction activity of Cu-based catalysts and agglomeration of active centers in acetylene hydrochlorination. Cu-based catalysts supported by NP co-doped activated carbon (AC) with different content (mCu-xNP/AC) were manufactured and applied in the acetylene hydrochlorination reaction. It was found that the doping of carriers N and P induced the transformation of Cu2+ to Cu+, and the catalytic activity was markedly improved. Under the optimal reaction temperature of 220 °C, the gas hourly space velocity (GHSV) of C2H2 was 90 h−1 and VHCl:VC2H2 was 1.15. The initial activity of the 5%Cu-30NP/AC catalyst reached 95.59%. Through some characterization methods showed the addition of N and P improved the dispersion of Cu in carbon, which increased the ratio of Cu+/Cu2+. The measurement results confirmed that the chemisorption capacity of mCu-xNP/AC for C2H2 decreased slightly, and the chemisorption capacity for HCl increased significantly, which was the reason for the increased activity of the catalyst. The conclusion provides a reference for the development of acetylene hydrochlorination Cu catalyst.