FUEL SYNTHESIZER

To enhance a combustion efficiency of an internal combustion engine 10 together with intending to miniaturize a hydrogen supply portion 40, when the internal combustion engine 10 and a fuel synthesizer 1 are arranged.SOLUTION: A fuel synthesizer 1 arranged together with an internal combustion engine 10, comprises: a catalyst reactor 31 that is provided with a purification catalyst 20 for purifying exhaust gas from the internal combustion engine 10, and a fuel synthesis catalyst 30 for chemically reacting carbon dioxide and hydrogen that have passed through the purification catalyst 20, an electric field applying unit 35 that applies an electric field to the catalytic reactor 31, a hydrogen supply unit 40 that supplies hydrogen to the catalytic reactor 31, a gas separation unit 60 for separating a gas exhausted from the catalyst reactor 31 into oxygen and gases other than oxygen, an oxygen reflux passage 65 connected to the gas separation unit 60 and an intake system 11, and an ECU 90 that inputs an electric field to the catalyst reactor 31 from an electric field application unit 35 to reflux oxygen generated in the catalytic reactor 31 to the intake system 11 through the oxygen reflux passage 65.SELECTED DRAWING: Figure 1 【課題】内燃機関１０とともに燃料合成装置１を配置する場合に、水素供給部４０の小型化を図るとともに内燃機関１０の燃焼効率を高める。【解決手段】内燃機関１０とともに配置される燃料合成装置１であって、内燃機関１０の排気を浄化する浄化触媒２０と、浄化触媒２０を通過した二酸化炭素と水素とを化学反応させる燃料合成触媒３０を具備し燃料を生成する触媒反応器３１と、触媒反応器３１に電場を印加する電場印加部３５と、触媒反応器３１に水素を供給する水素供給部４０と、触媒反応器３１から排出される気体を酸素と酸素以外の気体とに分離するガス分離部６０と、ガス分離部６０と吸気系１１とに接続される酸素還流通路６５と、電場印加部３５により触媒反応器３１に電場を印加させ、触媒反応器３１において発生した酸素を酸素還流通路６５を介して吸気系１１に還流させる制御を行うＥＣＵ９０と、を有する。【選択図】図１