Reactor

A reactor comprising:

• a single or a plurality of sheet bodies in which a chemical reaction is carried out at a working temperature higher than room temperature, and
• a plurality of support members for supporting the single or the plurality of sheet bodies,
• the single or the plurality of sheet bodies and the plurality of support members being stacked in alternating layers,
• wherein, a perimetric portion of each of the sheet bodies is held between a lower surface of a perimetric portion of an upper support member, which is the support member adjacent to and located above the sheet body, and an upper surface of a perimetric portion of a lower support member, which is the support member adjacent to and located below the sheet body, and the perimetric portion of the sheet body, the perimetric portion of the upper support member, and the perimetric portion of the lower support member are sealed against one another by means of a seal;
• the seal includes a first seal portion for sealing against an upper surface of the perimetric portion of the sheet body and the lower surface of the perimetric portion of the upper support member and for sealing against a lower surface of the perimetric portion of the sheet body and the upper surface of the perimetric portion of the lower support member, and a second seal portion for sealing against a lower side end of the perimetric portion of the upper support member and an upper side end of the perimetric portion of the lower support member;
• and
• at least a portion of the first seal portion which is in contact with the upper and lower surfaces of the perimetric portion of the sheet body is of glass having a first softening point lower than the working temperature, whereas at least a portion of the second seal portion which is located between the lower side end of the perimetric portion of the upper support member and the upper side end of the perimetric portion of the lower support member is of glass having a second softening point higher than the first softening point, or of ceramic.