Patent ID: 8912112

Claim:
A metal catalyst modified by a nitrogen-containing compound, wherein the nitrogen-containing compound is a nitrogen-containing 5-membered heterocyclic compound, wherein the nitrogen-containing compound is selected from the following group consisting of pyrrole and pyrrole derivatives (pyrroles), pyrroline and pyrroline derivatives (pyrrolines), imidazole and imidazole derivatives (imidazoles), imidazoline and imidazoline derivatives (imidazolines), and triazole and triazole derivatives (triazoles), wherein the nitrogen-containing compound has the structure of the following formula (I): wherein R 1 -R 5 are individually hydrogen, alkyl, NH 2 or NR 6 R 7 , R 6 and R 7 are individually alkyl, hydroxyl or alkoxyl, X 1 is nitrogen, and X 2 , X 3 , X 4 and X 5 are individually carbon or nitrogen, and the nitrogen-containing compound is electro-neutral; or the nitrogen-containing compound has the structure of the following formula wherein S 1 -S 7 are individually hydrogen, alkyl, NH 2 or NS 8 S 9 , S 8 and S 9 are individually alkyl, hydroxyl or alkoxyl, Y 1 is nitrogen and Y 2 , Y 3 , Y 4 and Y 5 are individually carbon or nitrogen, and the nitrogen-containing compound is electro-neutral.