The invention relates to a method for preparing a low-carbon olefin catalyst through
carbon dioxide hydrogenation. The low-carbon olefin catalyst comprises the following element components: iron,
zirconium,
potassium and
oxygen, the atomic
molar ratio of
zirconium to iron is (0-1):1, and the atomic
molar ratio of iron to
potassium is 10:1. The method for preparing the low-carbon olefin catalyst through
carbon dioxide hydrogenation comprises the following steps: (1) weighing an
iron source and a
zirconium sourse, preparing
aqueous solution, and marking the prepared
aqueous solution as solution A; (2) adding a precipitator into the solution A, stirring, and marking the obtained solution as solution B; (3) carrying out
microwave induction on the solution B; (4) centrifuging, filtering and washing reaction products,
drying and
roasting the obtained sample, and marking the roasted sample as a sample C; (5) weighing a
potassium source, dissolving the potassium source in deionized water, impregnating the sample C,
drying, and marking the dried sample as a sample D; and (6) carrying out tabletting,
pelletizing and
hydrogen gas reduction on the sample D, so that a catalyst sample is obtained. The method for preparing the low-carbon olefin catalyst through the
carbon dioxide hydrogenation has the advantages that conversion ratio of carbon dioxide
raw material is high, selectivity of low-carbon olefin is high, few CH4 and CO byproducts are produced, the catalyst is stable, and
powder particles of the obtained catalyst are small and uniform.