Preparation Of Catalyst Carrier Of Fischer-tropsch Synthesis Microreactor

Microreactor has large specific surface area, low pressure drop, high heat and mass transfer efficiency, so it can effectively improve the efficiency of Fischer-Tropsch synthesis catalysts. Catalyst carrier, as an important part of microreactor, is a focus of research at home and abroad.In this paper, two methods, acid treatment and oxidation of aluminized, were adopted to modify the substrate surface. Boehmite was Choosed as the precursor and y-Al2O3/stainless steel surface monolithic catalysts carrier was prepared through the sol-gel and twice-sintering methods. Dip-coating method was used to load the catalyst. The appearance feature and phase composition of carrier were characterized by XRD, EDS, SEM, BET, and the adhesion between matrix and carrier was tested by ultrasonic vibration. Catalyst properties were tested by gas chromatograph. The effect factors of the performance of catalyst carrier and the catalysts activity were systemic researched.The results show that acid treatment and two step sintering method could effectively improve the adhesion between substrate surface and carrier, and the mass-loss rate of the carrier was only1.24%. The catalyst carrier prepared by this method had good adhesion with substrate. The pores had good connectivity, and the main pore size was between5nm-10nm which matched with Co catalysts. The carrier cell growed smoothly and with extensive specific surface area, up to234m2/g. The catalyst had high C5+selectivity and high CO conversion rate which reached a value more than90%. Increased reaction temperature and pressure had a positive impacts on conversion rate.