Catalytic fuel vaporizer and fuel reformer assembly

In one embodiment, an assembly for use with a lean NOx catalyst (LNC) is described. An outer tube is coupled to the LNC. An inner tube is disposed completely inside the outer tube. The exhaust flow is split between the inner tube and the outer tube. The inner tube houses a catalytic fuel vaporizer and a catalytic fuel reformer that convert at least a portion of the injected hydrocarbons to hydrogen and carbon monoxide, and vaporized hydrocarbons for NOx reduction.