合成气一步法制备液化石油气单管实验研究

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(500~3 000 h^-1)条件下考察催化剂的性能。结果表明,在325 ℃、2.1 MPa、1 500 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≤2 500 h^-1时,系统可以稳定运行;空速达到3 000 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。

Direct synthesis of LPG from syngas in a single-tube reactor

A hybrid catalyst for the direct synthesis of liquefied petroleum gas (LPG) from syngas was prepared through mechanical mixing of methanol synthesis catalyst with dehydration catalyst; its catalytic performance was tested in a single-tube reactor with a simulated biogas at 220~330 ℃, 1.2~5.1 MPa and a space velocity of 500~3 000 h^-1. The results indicated that the hybrid catalyst has a good activity; at 325 ℃, 2.1 MPa, and a space velocity of 1 500 h^-1, CO conversion and LPG content in the hydrocarbons product are 72.36% and 71.21%, respectively. At 325 ℃ and 2.1 MPa, a stable operation can be realized at a space velocity below 2 500 h^-1, whereas the temperature cannot be well controlled at a space velocity over 3 000 h^-1, which may 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.