Patent ID: 8123825

Claim:
A microreactor for obtaining hydrogen gas by reforming a feed material, comprising: a first metal substrate including a first surface that includes a first single continuous microchannel portion to carry a catalyst and a second surface, opposite to the first surface, that does not include a microchannel portion, and a first through hole extends through the second surface directly into a first end of the first single continuous microchannel portion; a second metal substrate including a first surface that includes a second single continuous microchannel portion to carry a catalyst and a second surface, opposite to the first surface, that does not include a microchannel portion, the first and second metal substrates being stacked in multi-steps so that the first surfaces where said microchannel portions are formed are oriented in a same direction, and said second metal substrate is provided with a second through hole that extends from a location on the second surface of the second metal substrate that faces a second end of the first single continuous microchannel portion into a first end of the second single continuous microchannel portion for communication between said microchannel portions of the metal substrates in the respective steps; a heater that is disposed, via an insulating film, on the second surface of the first metal substrate where said microchannel portion is not formed; and a cover member having a gas outlet, the cover member being joined to said second metal substrate located at an outermost position of the multi-steps and exposing said second single continuous microchannel portion.