| abstract |
Oxides of nitrogen are adsorbed onto the surfaces of, and particulates are trapped in, pores of channels ( 130, 133, 139 - 151 ) in a porous, interdigitated ceramic particulate filter ( 57, 100 ) that has relative rotation with respect to a gas inlet distributor ( 76, 101 ). The distributor has a baffle ( 85 ) or ribs ( 121, 122 ) that causes constantly flowing engine exhaust ( 53 ) to enter the filter channels over a large portion of a revolution of the adsorption bed or the distributor, and causes constantly flowing syngas ( 54 ) to thereafter pass through those passages during a small portion of each revolution. Either the inlet gas distributor ( 101 ) or the filter bed ( 57 ) may be rotated to distribute the gases. Dual, alternately regenerated filters ( 35, 36 ) may be used. |