Monolithic gas trap adsorber for high efficiency, cost effective, low-emission condensing furnace

A method for treating flue gases from a natural gas furnace, the method comprising:

• positioning an acidic gas trap adsorber in an exhaust gas flow path between a primary heat exchanger and a secondary heat exchanger;
• and
• contacting a combustion waste gas from a natural gas furnace with the acidic gas trap adsorber, the combustion waste gas including gaseous sulfur compounds and gaseous nitrogen compounds, wherein the acidic gas trap adsorber comprises:
• a catalyst coating on a flow-through monolithic substrate, the catalyst coating including a metal oxide sorber component for trapping the gaseous sulfur compounds, trapping the gaseous nitrogen compounds, or trapping gaseous nitrogen redox from the combustion waste gas, the metal oxide sorber component comprising an oxide of Ti, Cu, Ba, Mn, Zr, Zn, Sr, Ca, Li, K, Na, Al, Ce or mixtures thereof, wherein the flow-through monolithic substrate comprises a zinc oxide that is wash coated with BaCO3 nanoparticles.

A system for treating flue gases from a natural gas furnace, the system comprising:

• an acidic gas trap adsorber in an exhaust gas flow path between a primary heat exchanger and a secondary heat exchanger, wherein the acidic gas trap adsorber comprises:
• a shell canister,
• a divergent cone coupled to an upstream side of the shell canister,
• a convergent cone coupled to a downstream side of the shell canister,
• a flow-through monolithic substrate within the shell canister, the flow-monolithic substrate including plurality of channels extending in a longitudinal direction between the divergent cone and the convergent cone, the plurality of channels each defining channel surfaces that are orthogonal to the longitudinal direction, and
• a catalyst coating on the channel surfaces of the flow-through monolithic substrate, the catalyst coating including a plurality of nanotubes that are oriented in a non-parallel direction with respect each other, the plurality of nanotubes comprising a metal oxide sorber component for trapping gaseous sulfur compounds, trapping gaseous nitrogen compounds, or trapping gaseous nitrogen redox from the combustion waste gas, the metal oxide sorber component comprising an oxide of Ti, Cu, Ba, Mn, Zr, Zn, Sr, Ca, Li, K, Na, Al, Ce or mixtures thereof.