| 摘要 |
<p>A catalyst unit for use in an exothermic reaction, such as ammonia oxidation, comprises a material effective as a catalyst for said reaction having a shape conforming to a disc or cone having a plurality of radially extending corrugations (5). The catalyst unit may be disposed across a reactor with a start-up burner disposed above the catalyst unit and mounted for rotation about the axis of the reactor. The burner tube is pivoted and provided with means, for example a follower (10,11) engaging with the upper surface of the catalyst unit, so that as the burner is rotated about the axis the burner tube (6) pivots to maintain the burner tube a constant distance above the upper surface of the catalyst unit. <IMAGE></p> |
