Simulation of activity loss of fixed bed catalytic reactor of MTO conversion using percolation theory

In this investigation, a reactor model for prediction of the deactivation behavior of MTO's porous catalyst in a fixed bed reactor is developed. Effect of coking on molecular transport in the porous structure of SAPO-34 has been simulated using the percolation theory. Thermal effects of the reaction were considered in the model and the temperature profile of the gas stream in the reactor was predicted. The predicted loss in catalyst activity with time-on-stream was in very good agreement with the experimental data. The resulting coke deposition and gas temperature profiles along the length of reactor suggested a reaction front moving toward the outlet of the fixed bed reactor at the operating experimental conditions of 1 h⁻¹ and 723 K for methanol space velocity and inlet temperature, respectively. Effects of space time, coordination of Bethe network, and effective diffusivity of component in reaction mixture on the reactor performance are presented.     

甲醇制烯烃反应机理和动力学研究进展

甲醇制烯烃（MTO）反应是重要的生产低碳烯烃技术，对于其反应机理的研究，尤其是第一个C—C键生成过程的探讨备受争论。近年来，Hydrocarbon Pool平行反应机理逐渐得到较广泛的认可，并在此基础上出现了很多MTO反应动力学的研究报道以及对该快速失活反应的催化剂积炭与失活现象的研究。针对在SAPO-34等分子筛催化剂的MTO反应情况，综述了近些年来国内外对于其反应机理、反应动力学、积炭和失活动力学的研究进展情况。