Abstract:

Ni2P/SAPO-11 catalysts were prepared by the decomposition of nickel hypophosphite impregnated on SAPO-11 supporter through excessive impregnation method. Their properties were characterized by means of N2 sorption-desorption, XRD, HRTEM. The effects of reaction conditions and the nickel phosphide content on hydroisomerization performance of n-heptane were investigated in a fixed-bed reactor. The results showed that Ni2P supported on SAPO-11 molecular sieve had quite highisomerization selectivity, however, the isomerization activity and aromatization selectivity were relatively loweras compared with the Pt-based catalystssupported on SAPO-11. The optimum load of Ni2P on SAPO-11 molecular sieve was 4%. Under the optimal conditions as follows: temperature of 400 ℃, pressure of 0.5 MPa, H2/CH(volume ratio) of 500 and LHSV of 1 h-1, the conversion of n-heptane and the isomerization selectivity reaches 73% and 90% respectively.

Key words: nickel phosphide, n-heptane, hydroisomerization