Process for removing hydrogen sulfide from sour gases with a layered triple hydroxide ZIF-67 composite

A method for removing hydrogen sulfide (H2S) from a H2S-containing gas composition, comprising:

• charging an aqueous media to a reactor under continuous agitation;
• dispersing particles of a composite in the aqueous media to form a composite mixture;
• continuously agitating the composite mixture;
• introducing the H2S-containing gas composition to the reactor containing the composite mixture under continuous agitation and passing the H2S-containing gas composition through the composite mixture;
• and
• adsorbing and removing H2S from the gas composition by the composite mixture to form a purified gas composition,
• wherein the composite comprises:
• a CuMnAl layered triple hydroxide (LTH);
• and
• zeolitic imidazolate framework-67 (ZIF-67) nanoparticles,
• wherein the ZIF-67 nanoparticles are dispersed between layers of the CuMnAl LTH, and
• wherein the composite is made by a method comprising:
• preparing the CuMnAl LTH;
• and
• mixing the CuMnAl LTH with precursors of the ZIF-67 to form the composite.