Rh-C3N4 heterogeneous catalyst for preparing acetic acid by carbonylation reaction

A method of preparing a Rh/C3N4 heterogeneous catalyst, comprising:

• (S1) preparing a carbon nitride support by heating a melamine resin serving as a carbon source to 500 to 550° C. in a nitrogen atmosphere,
• wherein the preparing the carbon nitride support in (S1) is performed by heating the melamine resin serving as the carbon source in a nitrogen atmosphere in a manner in which a reaction temperature is increased to 200 to 250° C. at a heating rate of 1 to 3° C./min, maintained for 20 to 40 min, further increased to 300 to 350° C. at a heating rate of 1 to 3° C./min, maintained for 20 to 40 min, additionally increased to 500 to 550° C. at a heating rate of 1 to 3° C./min, and maintained for 200 to 300 min;
• (S2) preparing a rhodium complex by reacting a rhodium compound with 3-benzoylpyridine;
• and
• (S3) preparing a Rh/C3N4 heterogeneous catalyst by immobilizing, on the carbon nitride support prepared in (S1), the rhodium complex prepared in (S2).