Segmentation by type classifies Aldehyde Catchers into four functional families, each with distinct sub‑technologies that affect cost structure and performance. Solid‑phase adsorbents (e.g., activated carbon, zeolite‑based resins) provide high surface area and are favored in batch processes; their subtypes include surface‑functionalized polymers and metal‑organic frameworks. Liquid‑phase scavengers (e.g., amino‑alcohol solutions, bisulfite reagents) dissolve directly into reaction media, with sub‑variants such as nucleophilic salts and catalytic oxidants. Membrane‑based catchers employ selective permeation layers (polymer‑based, ceramic) to continuously extract aldehydes, offering modular scalability. Hybrid systems combine solid and liquid mechanisms, exemplified by impregnated beads or fluidized‑bed reactors, delivering synergistic removal efficiency. The relative market share of each type aligns with application‑driven requirements: solid‑phase dominates in high‑purity pharma, liquid‑phase in food processing, membranes in continuous chemical synthesis, and hybrids in emerging environmental solutions.