▎ 摘　　要

NOVELTY - Load type three-component single-atom solid alkali catalyst comprises two active components and a co-component modified carrier, where the first active component is alkali metal, the second active component is alkaline earth metal and the synergistic component is III main group metal. USE - The load type three-component single atom solid alkali catalyst is useful in the reaction of ester exchange synthesizing dimethyl carbonate (claimed). ADVANTAGE - The catalyst is economical, convenient, stable and good for conducive and recycling and good catalytic activity and cyclic stability in the reaction of ester exchange synthesizing dimethyl carbonate and increases the defect and vacancy of the carrier, promotes the dispersion of the basic position, promotes the interaction between the carrier, reduces the loss of the alkaline site, and prolongs the service life of the catalyst. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the load type three-component single-atom solid alkali catalyst comprising (i) dissolving the synergistic component precursor in the solvent, adding carrier material according to proportion, stirring, stirring water bath and evaporating, placing in 90-100℃ oven drying for 12-24 hours, placing the dried sample in a tubular furnace for pre-activating at low temperature of 300-600℃ for 2-3 hours in inert atmosphere to obtain the carrier modified by the synergistic component, (ii) dissolving the first and second active component precursor in the solvent, adding synergistic component modified carrier according to the proportion, stirring water bath and evaporating, placing in the oven to dry to obtain the to-be-activated sample, and (iii) placing the to-be-activated sample in the tubular furnace, baking and activating in the protective atmosphere at high temperature, converting the active component precursor into free metal atom and stabilizing the anchor in the carrier modified by the synergistic component.