Catalyst performance testing: bed dilution revisited

摘要: Abstract A study was performed to investigate the systematic (negative) deviation of conversion caused by dilution catalyst bed with inert particles in gas–solid systems for an irreversible first order reaction. Dilution may significantly reduce due local bypass effects. Bed does not yield a homogeneous activity decrease, but gives rise discrete surrounding. In particular at high dilution, i.e. when using more diluent than catalyst, effect become significant. This phenomenon studied both experimentally catalytic N 2 O decomposition over Co–La–Al mixed oxide, and random particle distribution model. The experimental model results agree well although there is some uncertainty value average size be used. best description data obtained apparent 0.30 instead 0.18 mm , which ascribed agglomeration. For practical application, relative Δ can estimated from observable parameters, observed x i ,dil volume fraction b height h diameter d p . combination should avoided kinetic studies.