This Book presents the ability of zirconia and modified zirconia coated on cordierite honeycomb monolith as heterogeneous solid acid-base catalysts in selected liquid/vapour phase organic reactions. The catalyst coated on cordierite honeycomb monolith has advantages over powder form catalyst with high active surface area. A very thin layer of the catalysts loaded on monolith is highly effective and gives high active surface area, safe to store and long life time, and environmentally safe disposal, easy separation and complete recovery from the reaction mixture and active over a wide range of...