Title: The Hydrocarbon Products Distributions and Stability of Cobalt-Based Catalyst for Fischer-Tropsch Synthesis
Abstract: Using incipient impregnation method, zirconia modified γ-Al2-O3 supported Co-Ru bimetallic catalyst was prepared. The effects of the operation conditions, such as reaction temperature, pressure, space velocity and H2/CO molar ratio in feed, on product distribution were investigated in a fixed-bed reactor, and the 552 h stability test of the catalyst prepared was also carried out. The results show that the lower reaction temperature, the higher pressure and the lower space velocity facilitate the growth of carbon chains, and the selectivity of C12~C18 diesel fraction and C19+ wax are enhanced. Increasing the H2/CO ratio in feed, the selectivity of C5~C11, methane and other low carbon number hydrocarbons will increase, while that of C12~C18 and C19+will decrease. Under the conditions of H2/CO ratio in feed 1.58~2.0, reaction temperature 453~523 K, pressure 1.0~2.5 MPa and space velocity 500~1000 h?1, the catalyst prepared exhibits excellent reactivity to produce heavy hydrocarbons. At the reaction condition of H2/CO ratio in feed 2.0, 493 K, 1.5 MPa and 800 h?1, a stable hydrocarbon distribution of the product can be kept during a long run of 552 h by using the catalyst prepared, during which the CO conversion is over 80% and the C5+ selectivity is over 83%. It indicates that the catalyst using time affects the product distribution inconspicuously, the product hydrocarbons mainly consist of paraffin and the average selectivity of C1, C2~C4, C5~C11, C12~C18 and C19+ are 6.94%, 6.20%, 33.04%, 31.55% and 22.27%, respectively.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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