合成气一步法制备液化石油气单管实验研究

摘要

采用甲醇合成催化剂与脱水催化剂机械混合，制备了液化石油气（LPG）合成催化剂。以模拟生物质气为原料气，在固定床单管实验装置上，温度（220～330℃）、压力（1．2～5．1 MPa）和空速（500～3000h －1）条件下考察催化剂的性能。结果表明，在325℃、2．1 MPa 、1500 h－1条件下，CO 转化率达到72．36％，LPG 占烃类产物的71．21％。当设定温度为325℃、压力2．1 MPa 时、空速≤2500 h－1时，系统可以稳定运行；空速达到 3000 h－1时，反应器内部温度迅速升高无法控制，造成催化剂烧结失活。针对上述催化剂，采用 NH3－TPD、XRD、N2吸附－脱附和 TPO 对催化剂进行了表征。结果表明，催化剂的积炭、强酸位酸性降低及比表面积的降低是导致催化剂活性降低的重要影响因素。%A hybrid catalyst for the direct synthes is of liquefied petroleum gas (LPG) from syngas was prepared th rough mechanical mixin g of methanols ynthesis catalyst with dehydration catalyst; its catalyt ic performance was tested in a single-tub e reactor with a simulated biogas at 220 ~330 ℃, 1.2 ~5.1 MPa an d a space velocity of 500~3 000 h-1 .The results indicated that the hybrid catalyst hasa good activity; at 325℃, 2.1 MP a, and a space v e locity of 1 500 h-1 , CO conversion and LPG conten t in the hydrocarbons product ar e 72.36% and 71.21%, respectively .At 325℃ and 2.1 MPa, a stable operation can be realiz ed at a spac e velocity below 2 500 h-1 , wh ereas the temper ature cannotb e well controlled at a space velocity ov er 3 000 h-1 ,w hichm ay lead to the catalyst deactivation.The NH3-TPD, XRD, N2 sorption and TPO characterization results suggest that the deposition of coke and decrease of the mount of strong acid sites and surface area are responsible for the catalyst deactivation.