关键词: 催化剂量, 催化加氢, 脱硫反应动力学, 铁系催化剂, 十二烷, 转化率, 催化剂粒度, 动力学常数, 动力学数据, 加氢脱硫

Abstract: The appearent kinetics of the hydrodesulfurization of thiophene in the hydrogendodecane-thiophene-catalyst system was studied with a resonant tube bomb reactor under hydrogen pressure of 40-150 Kg/cm².The catalysts used in this investigation are a kind of commercial catalyst——3665(NiMo/Al₂O₃) and several iron catalysts Under the above conditions and at temperature of 245-300℃ and with catalyst less than 0.5mm in diameter,the intrinsic kinetics(without the effect of diffusion) is as follows: the reaction is first order with respect to both hydrogen and thiophene,at 267℃ the reaction rate is r=k'P_HC_TP,k'=1.12×10^-4min^-1.atm^-1)(on NiMo/Al₂O₃); the activation energy is 24700 cal/mole When the granularity is larger than 0.5 mm,the effeciveness η decreases due to increase of intraparticle diffusion.When the catalyst loading m is less than 0.2g,the appearent kinetic rate constant k is proportional to m,when m is greater than 0.2 g,its increase tends to slow down The catalytic activities of several binary or trinary iron catalysts were explored It was found that their activities is much lower than that of NiMo/Al₂O₃,and the order of their activities is.Fe(OH)₃+MoO₃+SFe(OH)₃+NiO+SFe(OH)₃+SFe(OH)₃+CuO+S.The role of tetralin,when it replaced dodecane partially,was observed.It was found that on both NiMo/Al₂O₃ and iron catalysts the existence of tetralin makes the conversion of thiophene decline,i.e.under these conditions tetralin has no hydrogen transferring power.