钴基分子筛结构催化剂费托合成航空燃料

Cobalt-based molecular sieve structural catalysts for Fischer-Tropsch synthesis of aviation fuel

在双碳和全球气候变化的背景下,SAF(可持续航空燃料)是实现航空业净零排放目标的关键,而费托合成是制备SAF的重要途径之一。采用浆料法和浸渍法制备3种不同的FeCrAl金属基丝网结构催化剂:Co/H-ZSM-5(微孔)、Co/H-Y(微孔)和Co/H-Y(介孔),用于费托合成制备SAF。通过N_(2)低温吸附、SEM、NH_(3)-TPD等手段对催化剂进行表征,并评价其费托合成催化性能。结果表明反应条件对费托合成的产物选择性至关重要。在230℃、2.0 MPa和6000 h^(-1)空速下,3种结构催化剂的C_(8)-C_(16)(航煤)选择性均达到最高。Co/H-Y(介孔)相较于其他2种催化剂具有更高的C_(8)—C_(16)选择性(52.12%)和较高的CO转化率(28.95%)。与现有文献报道的费托合成制备航煤催化剂相比,文中制备的结构催化剂表现出较高的活性和选择性,且制备过程简单、易于获取、成本低廉,为工业化制备SAF提供了潜在的候选催化剂。

Amidst the imperative of carbon neutrality and the challenges posed by global climate change,the quest for sustainable aviation fuels(SAF)assumes paramount importance in the aviation sector′s pursuit of net-zero emissions objectives.Fischer-Tropsch synthesis emerges as a pivotal route for SAF production.This study focused on the preparation and evaluation of three distinct FeCrAl metal-based wire mesh structured catalysts,namely Co/H-ZSM-5(microporous),Co/H-Y(microporous),and Co/H-Y(mesoporous),through slurry and impregnation methods for Fischer-Tropsch synthesis aimed at SAF generation.Characterization of the catalysts involved N_(2)low-temperature adsorption,SEM,NH_(3)-TPD,among other techniques.The catalytic performance in Fischer-Tropsch synthesis was assessed,revealing the critical influence of reaction conditions on product selectivity.Notably,all three catalyst structures exhibit maximum selectivity towards C_(8)-C_(16)(aviation fuel)at 230℃,2.0 MPa and 6000 h^(-1).Co/H-Y(mesoporous)demonstrates superior aviation kerosene selectivity(52.12%)and CO conversion rate(28.95%)compared to its counterparts.Furthermore,the prepared structural catalysts showcase enhanced activity and selectivity compared to existing literature on Fischer-Tropsch synthesis for aviation fuel catalyst preparation.Moreover,their preparation process is simple,easily accessible and cost-effective,providing potential candidate catalysts for industrial-scale SAF production.