Preparation of highly dispersed and large pore size iron sulfide/SiO<sub>2</sub> catalyst by precipitation deposition method and its efficient conversion of vacuum residue

化学工业与工程

Chemcial Industry and Engineering

2024, Vol. 41

Issue (4) :65-75 DOI: 10.13353/j.issn.1004.9533.20220334

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Preparation of highly dispersed and large pore size iron sulfide/SiO₂ catalyst by precipitation deposition method and its efficient conversion of vacuum residue

LIN Congfu¹, BAI Yang¹, TIAN Lei², GUO Qiang^2,3, YANG Yong^2,3, FENG Fuxiang², LIU Yuan¹

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2. National Energy Center for Coal to Liquids, Synfuels China Technology Co. Ltd, Beijing 101407, China;
3. Synfuels China Technology (Inner Mongolia) Co. Ltd, Inner Mongolia, Ordos 010300, China

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Abstract 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 electrostatic 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.

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	LIN Congfu
	BAI Yang
	TIAN Lei
	GUO Qiang
	YANG Yong
	FENG Fuxiang
	LIU Yuan

Keywords： iron sulfide catalyst highly dispersed slurry-bed reactor sol-gel

Received 2022-05-05;

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LIN Congfu, BAI Yang, TIAN Lei, GUO Qiang, YANG Yong, FENG Fuxiang, LIU Yuan.Preparation of highly dispersed and large pore size iron sulfide/SiO₂ catalyst by precipitation deposition method and its efficient conversion of vacuum residue[J] Chemcial Industry and Engineering, 2024,V41(4): 65-75

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