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The invention discloses a preparation method and application of a chromium-doped fullerene C20 catalyst. According to the invention, fullerene C20 is used as a carrier, chromium atoms are efficiently introduced into a carbon cage structure of fullerene C20 through chemical doping, and a stable active center with a strong electron coupling effect is successfully constructed. The method specifically comprises the following steps: dispersing fullerene C20 in toluene, carrying out ultrasonic treatment, adding chromium trichloride, carrying out a doping reaction under nitrogen protection, and carrying out centrifugation, washing and drying to obtain the target catalyst. The catalyst shows excellent performance in the reaction of catalyzing carbon dioxide hydrogenation to prepare formic acid, under the mild condition, the highest carbon dioxide conversion rate can reach 90.2%, the highest formic acid yield can reach 92.6%, and the catalytic activity retention rate is still 91.7% or above after the catalyst is recycled five times. The process is simple, the prepared catalyst has the advantages of high activity, high selectivity and high stability, and a new material is provided for efficient resource utilization of carbon dioxide.

The application discloses a pre-treatment method of carbon baking filler for aluminum, aiming at controlling the migration and accumulation of iron impurities from the filler, comprising the following steps: S1, screening the filler to be treated according to the particle size, and separating the filler into at least two different particle size intervals, wherein the particle size of the filler in at least one particle size interval is less than 2 mm; S2, performing air separation purification on the filler with a particle size less than 2 mm to remove iron-containing particles; S3, sequentially performing weak magnetic separation treatment and strong magnetic separation treatment on the filler in each particle size interval obtained in the step S1 to remove iron-containing impurities; S4, performing acid treatment on the filler after the air separation purification and the magnetic separation treatment to remove an iron oxide film attached to the surface of the filler particles; and S5, uniformly mixing the filler in each particle size interval after the treatment according to the original mass proportion before the screening.

The invention relates to the technical field of chemical synthesis, and particularly discloses an indolizine compound and a preparation method thereof. The structure of the indolizine compound is shown as a formula (I). The invention provides a preparation method of an indolizine compound based on a one-step addition reaction. The method has the outstanding advantages of mild reaction conditions, simple operation steps and the like, and effectively overcomes the common problems of tedious steps, harsh conditions and the like in the existing synthesis route. The establishment of an efficient synthesis route provides a reliable way for rapidly preparing indolizine derivatives with novel structures in a large scale, so that a solid material foundation is laid for deeply exploring brand new application of the compounds in the fields of drug discovery, material science and the like. The series of novel indolizine compounds with potential excellent biological activity provide a new opportunity for discovery of innovative drug lead compounds and development of novel functional materials, and have important research value and wide application prospects. Formula (I).