Performance of Sulfur Modified Catalysts for Hydroisomerization of 1-Butene
1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. State Key Laboratory of Green Chemical and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract The sulfur-modified Ni-based catalysts were prepared by the incipient wetness impregnation technique with the Ni/Al2O3 in solution of organic polysulfide. The catalysts were characterized by X-ray fluorescence (XRF), thermogravimetry-mass spectrometry (TG-MS), X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction (TPR).The performance of sulfur-modified Ni/Al2O3 catalyst on hydrogen isomerization of 1-butene double bond was investigated. The results showed that the sulfur content of the sulfur-modified Ni/Al2O3 catalyst was almost unchanged after the activation of high temperature hydrogen and extraction with toluene. Since there was a strong interaction between the sulfur and the catalyst, nickel oxide was reduced by hydrogen at relatively low temperature. Sulfur changed the electronic environment around the Ni metal, thereby significantly improved the hydroisomerization of the catalyst at the double bond. The conversion up to 92.6%, selectivity of 2-butene 97.5% were obtained when sulfur modified Ni/Al2O3 catalyst was used to catalyze the hydroisomerization of 1-butene under the operation conditions of temperature 60 ℃ , hydrogen pressure 1.6 MPa and the molar ratio of H2 to C4 0.013. The catalyst stability tests demonstrated that the sulfur- modified Ni/Al2O3 performed excellent with good stability.
