Preparation of highly dispersed and large pore size iron sulfide/SiO2 catalyst by precipitation deposition method and its efficient conversion of vacuum residue
Aiming at the problem of low activity and high reaction pressure of heavy oil slurry bed iron-based catalysts,the precursor was prepared by the precipitated sol-gel method,and the highly dispersed iron sulfide catalyst supported by SiO2 was obtained by pre-sulfidation.The catalytic performance of the catalyst at a low pressure(5 MPa)on the model compounds naphthalene and Merey vacuum residue was investigated,and the catalyst and precursor were characterized by nitrogen adsorption-desorption,ICP,XRD,Mössbauer(MES),SEM-EDS,TEM and other methods.At the low iron content of the catalyst(Fe2O3 in Fe2O3/SiO2 is 20％),the yield of light oil can reach 54.9％,and the coke yield can be as low as 1.6％.The good performance of the catalyst is attributed to the high dispersion of Fe2O3 in the catalyst precursor and iron sulfide in the catalyst and the large pore size with an average pore size of about 20 nm.The catalyst is prepared by a simple and easy method:by adjusting the pH value of the sol,the iron hydroxide colloids are positively charged and the silica particles are negatively charged,and the elec-trostatic attraction is used to achieve high dispersion and"confinement"of iron hydroxide(to inhibit its agglomeration),and the large pore size is obtained by particle packing.
iron sulfide catalysthighly dispersedslurry-bed reactorsol-gel
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