(EP812617-A2)      A reactor reforms methanol with steam and has a reaction chamber packed with catalyst pellets (2) carried by a sieve (3). Below the sieve, which only allows pellet fragments and dust through, there is a metal wool fleece (4). Preferably a space intervenes between sieve and metal wool. The metal wool is removable. In a connected region (5) following the reaction chamber and below the level of the sieve, there is an externally-cleanable filter (6) to abstract finer dust particles coming from the pellets.    USE -   A methanol/steam reformer catalyst for mobile use.    ADVANTAGE -   In this reactor, measures are taken to prevent its blockage by pellet fragments and dust particles. The reactor is particularly designed for mobile use, e.g. for the recovery of hydrogen as fuel, to be used in a fuel cell-operated vehicle. The sieve allows fragments and dust through, but not the pellets themselves. The metal wool intercepts the debris, and can be removed for cleaning and/or replacement. The device is particularly suitable for use in vehicles, where jolting is frequent. In a valuable feature, the fragments are retained, and can continue their action, though broken. Fine, suspended particles are removed by the additional filter.    (US5922291-A)      A reactor reforms methanol with steam and has a reaction chamber packed with catalyst pellets (2) carried by a sieve (3). Below the sieve, which only allows pellet fragments and dust through, there is a metal wool fleece (4). Preferably a space intervenes between sieve and metal wool. The metal wool is removable. In a connected region (5) following the reaction chamber and below the level of the sieve, there is an externally-cleanable filter (6) to abstract finer dust particles coming from the pellets.    USE -   A methanol/steam reformer catalyst for mobile use.    ADVANTAGE -   In this reactor, measures are taken to prevent its blockage by pellet fragments and dust particles. The reactor is particularly designed for mobile use, e.g. for the recovery of hydrogen as fuel, to be used in a fuel cell-operated vehicle. The sieve allows fragments and dust through, but not the pellets themselves. The metal wool intercepts the debris, and can be removed for cleaning and/or replacement. The device is particularly suitable for use in vehicles, where jolting is frequent. In a valuable feature, the fragments are retained, and can continue their action, though broken. Fine, suspended particles are removed by the additional filter.