Patent ID: 7141708

Claim:
A method for selectively catalyzing gas phase exothermic reactions comprising employing in said reaction a catalyst pellet comprising: a. a uniform cross-section or, if not uniform, a cross section having a deviation from the average cross-section area of less than 30%, wherein the cross-section is substantially parallelogram-shaped; and b. one or more through-bores, having: 1. axes which are parallel to each other and to the axis of the pellet or, if not parallel, axes having a deviation from a parallel line of less than 20%; and 2. uniform cross-sections, or, if not uniform, cross-sections having a deviation from the average cross-section of less than 30%; and wherein said one or more through-bores further comprise: i. one bore having the same shape as the cross-section of the pellet or two or more bores obtained by introducing internal reinforcing vanes in said one bore; or ii. two or more bores having a circular or elliptical shape and, if four or more bores are present, having different distances between the centres of the non-adjacent couples of bores.