A　catalytic　reverse　flow　reactor　was　employed　for　the　combustion　of　lean　carbon　monoxide　in　air　mixture.　The　catalytic　combustion　of　CO　over　a　Pd　mixed　oxide　supported　on　cordierite　coated　with　Ce/La　was　investigated.　The　catalysts　were　prepared　using　a　sol-gel　method　and　characterized　using　BET　and　SEM.　The　effects　of　Pd　content,　preheated　temperature,　calcination　temperature　and　calcination　time　on　catalyst　performance　were　studied.　Furthermore,　the　performances　of　the　reactor　such　as　pressure　drop　and　bed　temperature　distribution　were　investigated.　The　catalysts　calcined　at　550　degrees　C　for　3　h　with　Pd　content　being　2.5　wt%　exhibited　the　highest　catalytic　activity.　The　conversion　attained　90%　when　the　switch　time　was　8　min,　the　GHSV　was　8000h(-1),　and　the　initial　concentration　was　100ppm.　The　pressure　drop　of　the　system　was　small　when　the　GHSV　was　lower　than　10000h(-1).　The　initial　preheating　temperature　of　the　catalyst　had　a　greater　influence　on　the　temperature　distribution　in　the　reactor.