Utilization of multi-functional catalysis is fast becoming the method of choice to boost the production of valuable chemicals from CO₂. Here, we present a possible route to increase selectivity to light olefins by modifying the acidity of the zeolitic component of a multi-functional catalyst. This is carried out via incorporation of Ca on the zeolite ZSM-5 by incipient wetness impregnation. This incorporation, while straightforward, leads to reduced Brønsted acidity and the formation of multiple Lewis acidic species inside the zeolite. NMR investigations point towards incorporation of CO/ketene into the zeolite leading to the creation of surface acetate species, which augments the production of light olefins. Additionally, the suppression of oligomerization due to the reduction of Brønsted acid sites also produces more light olefins at the expense of longer chain hydrocarbons.

多功能催化的使用正迅速成为促进从CO ₂产生有价值的化学药品的选择的方法。。在这里，我们提出了一种可能的途径，通过改变多功能催化剂的沸石组分的酸度来提高对轻质烯烃的选择性。这是通过通过初期湿润浸渍将Ca掺入沸石ZSM-5中来进行的。这种掺入虽然很简单，却导致布朗斯台德酸度降低，并在沸石内部形成多种路易斯酸性物质。NMR研究表明，将CO /乙烯酮掺入沸石中会导致表面乙酸盐类物质的产生，从而增加了轻质烯烃的生产。另外，由于布朗斯台德酸位点的减少而引起的低聚反应的抑制也产生了更多的轻质烯烃，但以更长链的烃为代价。