Method for the treatment of an exhaust gas and an HVAC system
The present invention relates to a method for the treatment of an exhaust gas comprising carbon monoxide (CO) and/or one or more volatile organic compounds (VOCs) using a PGM-free catalyst article comprising a mixed oxide of Mn, Cu, Mg, Al and La. The present invention also relates to an HVAC system comprising a PGM-free catalyst article.
1. A method for the treatment of an exhaust gas comprising carbon monoxide (CO) and/or one or more volatile organic compounds (VOCs), the method comprising, contacting the exhaust gas with a PGM-free catalyst article comprising a mixed oxide of Mn, Cu, Mg, Al and La.
2. The method according to claim 1 , wherein the mixed oxide comprises 40 to 50 wt % Mn and at least 5 wt % Cu, on a metal-only basis.
3. The method according to claim 1 , wherein the mixed oxide comprises, on a metal-only basis:
40 to 50 wt % Mn;
6 to 8 wt % Cu;
3 to 6 wt % Mg;
1 to 3 wt % Al;
35 to 45 wt % La.
4. The method according to claim 3 , wherein the mixed oxide consists essentially of Mn, Cu, Mg, Al, La, and oxygen.
5. The method according to claim 1 , wherein the mixed oxide comprises, on a metal-only basis:
42 to 48 wt % Mn;
about 7 wt % Cu;
about 4.5 wt % Mg;
about 2 wt % Al; and
39 to 43 wt % La.
6. The method according to claim 1 , wherein a molar ratio of Mn to La is from 2.5:1 to 3:1.
7. The method according to claim 1 , wherein the VOCs comprise one or more compounds selected from the group consisting of methanol, ethanol, acetaldehyde, formaldehyde, propene and ethylene.
8. The method according to claim 1 , wherein the exhaust gas is from an HVAC system or is a tail-gas from a chemical synthesis process.
9. The method according to claim 1 , wherein the exhaust gas is from a terephthalic acid synthesis process.
10. An HVAC system comprising a PGM-free catalyst article comprising a mixed oxide of Mn, Cu, Mg, Al and La.
11. An HVAC system of claim 10 , wherein the mixed oxide comprises, on a metal-only basis:
40 to 50 wt % Mn;
6 to 8 wt % Cu;
3 to 6 wt % Mg;
1 to 3 wt % Al; and
35 to 45 wt % La.