What absorbs cat litter odor?
Last updated: February 2025
Activated carbon is the most effective material for absorbing cat litter odor. Made from coconut shells, wood, or coal, it has millions of microscopic pores that trap ammonia and other odor molecules through a process called adsorption. Zeolite, a natural volcanic mineral, also absorbs odors reasonably well but has less surface area than activated carbon. Baking soda absorbs some moisture but has minimal effect on ammonia gas. Charcoal briquettes can help in a pinch but are not food-safe and less effective than activated carbon designed for odor control. For best results, use activated carbon specifically manufactured for pet odor applications, as it has the optimal pore size for ammonia molecules.
Odor-absorbing materials ranked
Activated Carbon
1000+ m²/g surface area. Binds ammonia permanently. Most effective option.
Zeolite
Natural mineral. Moderate absorption. Good for moisture and some odors.
Baking Soda
Limited effect. Mostly masks odor. Not effective on ammonia.
How absorption actually works
True absorption requires porous materials with high surface area. A teaspoon of activated carbon has the surface area of a football field. Ammonia molecules collide with the carbon surface and become trapped in pores slightly larger than the molecules themselves. This physical bond holds them until the carbon is replaced.
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