NOVELTY - A liquid fuel catalytic partial oxidation (CPOX) reformer (400') comprises an array of spaced-apart CPOX reactor units (408'), each containing an elongate tube with gas-permeable wall which has internal surface and external surface, encloses open gaseous flow passageway, and defines inlet (431') and outlet of CPOX reactor unit, and hydrogen barrier associated with external surface of reactor; vaporizer in fluid communication with inlets of CPOX reactor units; and igniter (435') in thermal communication with a section of gas-permeable wall containing a CPOX catalyst of greater than or equal to 1 CPOX reactor unit.    USE - A liquid fuel catalytic partial oxidation reformer for hydrogen-rich reformate production (claimed).    ADVANTAGE - The reformer has improved thermal management which can contribute to the stabilization of the temperature of CPOX reacting taking place within each CPOX reactor units. The CPOX catalyst-containing wall section is gas-permeable to allow diffusion of CPOX reaction mixture and hydrogen-rich product reformate while remaining structurally stable under CPOX reaction conditions. CPOX reactor units are spaced apart so that heat loss can occur from CPOX reactor unit to prevent damage to CPOX reactor unit, and if present, to a fuel cell stack that can be in fluid and thermal communication with outlet of CPOX reactor unit, providing an appropriate thermal balance among the array and facilitating thermal uniformity throughout or across the array.    DETAILED DESCRIPTION - A liquid fuel catalytic partial oxidation (CPOX) reformer comprises an array of spaced-apart CPOX reactor units, each containing an elongate tube with gas-permeable wall which has internal surface and external surface, encloses open gaseous flow passageway, and defines inlet and outlet of CPOX reactor unit in which CPOX reactor unit is in thermal communication with adjacent CPOX reactor unit in the array, and section of gas-permeable wall has a CPOX catalyst, and hydrogen barrier associated with external surface of CPOX catalyst-containing wall section of CPOX reactor unit; vaporizer in fluid communication with inlets of CPOX reactor units; and igniter in thermal communication with a section of gas-permeable wall containing a CPOX catalyst of greater than or equal to 1 CPOX reactor unit. An INDEPENDENT CLAIM is included for method of CPOX reforming a liquid reformable fuel to hydrogen-rich reformate which involves introducing gaseous CPOX reaction mixture comprising vaporized liquid reformable fuel into inlets of CPOX reactor units, initiating catalytic partial oxidation of gaseous CPOX reaction mixture to begin production of hydrogen-rich reformate in greater than or equal to 1 CPOX reactor unit, and maintaining catalytic partial oxidation of gaseous CPOX reaction mixture in the CPOX reactor unit.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal cross-sectional diagram of a liquid fuel CPOX reformer.    Liquid fuel CPOX reformer (400')    Centrifugal blower system (402)    CPOX reactor units (408')    Inlet of CPOX reactor unit (431')    Igniter (435')