A fuel generator and a method for generating fuel are disclosed in which a monolithic block includes a plurality of plates stacked and bonded together. A first input port and a second input port are disposed on the monolithic block. The first input port is coupled to a source of hydrogen gas and the second input port is coupled to a source of carbon dioxide or syngas. An output port is disposed on the monolithic block and is coupled to a fuel reservoir. The plurality of plates form a plurality of reaction regions. At least a portion of the plurality of reaction regions convert one of the carbon dioxide or syngas and hydrogen into a hydrocarbon fuel that is supplied from the output port.

A fuel generator and a method for generating fuel are disclosed in which a monolithic block includes a plurality of plates stacked and bonded together to form a plurality of reaction regions. A first input port and a second input port are disposed on the monolithic block. The first input port is coupled to a source of hydrogen gas and the second input port is coupled to a source of carbon dioxide or syngas. An output port is disposed on the monolithic block and is coupled to a fuel reservoir. A first subset of the plurality of plates is bonded together to form a first reaction region, a second subset of the plurality of plates is bonded together to form a second reaction region, and a third subset of the plurality of plates is bonded together to from a channel that fluidically connects the first and the second reaction regions.