To prove the applicability of zeolite crystals as a catalyst in dustproof low pressure drop reactors, a novel structured catalyst packing has been developed consisting of ZSM‐5 crystals in situ grown on metal wire gauze. Using this technique, mechanically strong catalyst packings of any required shape can be produced that give an extremely low pressure drop across the packing and that trap almost no dust particles. These features make the packing especially suitable for end‐of‐pipe processes, such as the catalytic removal of NOx from large flows of dust containing flue gas. To demonstrate the feasibility of the packing as a catalyst, it was tested — after incorporation copper into the zeolites by ion exchange — on its activity for Selective Catalytic Reduction of nitric oxide with ammonia at 350°C. Both the activity and selectivity of the catalyst packing proved to be superior to conventional vanadia/titania catalysts.

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Attrition tests have been performed on an aluminate-based synthetic sorbent intended for regenerative sulphur capture from flue gas in a fluidised bed coal combustor.A comparison with lime(stone) has also been made. Single-particle crushing strength tests have been used to investigate the role of breakage caused by static mechanical stress, while impact tests have been applied to study kinetic stress. Multi-particle fluidised bed tests have been used to examine attrition by thermal shock (thermal stress), coal combustion (thermal and chemical stress) and fluidisation (kinetic stress) independently. The attrition resistance of the synthetic sorbent is much higher than that of lime(stone).It appears however that the effect of coal combustion on sorbent attrition needs further research. The morphology of the sorbents is only slightly affected by the various tests mentioned above.