Higher-CPSI zeolite honeycomb provides finer channels and more gas-solid interface but usually increases pressure drop and plugging sensitivity. Lower CPSI offers more open flow. Select cell density from mass-transfer, fouling and hydraulic requirements rather than assuming 200 CPSI is automatically better than 100 CPSI.

Conventional ceramic honeycomb mainly manages heat, while zeolite honeycomb is designed to adsorb selected VOC molecules. Zeolite performance depends on molecular size, humidity, temperature, adsorption capacity and regeneration conditions in addition to CPSI and block geometry.

A complete foam ceramic specification includes application, material, PPI, porosity, dimensions, mechanical requirement, operating temperature, process chemistry, flow, fouling conditions and any catalyst coating. These parameters interact, so no single PPI or porosity value can define the correct product.

Foam ceramic plugs because particles and deposits are intercepted throughout its tortuous pore network. Cleaning should match the deposit and protect both ceramic struts and any catalyst coating. Repeated plugging may indicate the selected PPI is too fine for the process.

TiO₂ coating changes alumina foam ceramic by adding active microscopic surface while also changing weight, pore openings and pressure drop. Final performance depends on coating loading, BET area, adhesion, light access and service conditions—not simply the presence of TiO₂.