Catalytic decomposition of malodorous substances such as ammonia

Ammonia, a representative example of the specific malodorous substances (22 substances) stipulated in the Offensive Odor Control Law, is said to be a causative agent of household odors such as urine and pet odors. Because the pungent odor is often encountered in daily life, it is a substance with a particularly high need for deodorization even among these specific malodorous substances.
Furthermore, major sources of ammonia in industry and manufacturing include livestock farms, chemical plants, rendering plants, and human waste treatment plants, and the regulatory standard at site boundaries is set at a substance concentration range of 1 ppm to 5 ppm.
A conventional approach to remove ammonia with a catalyst is decomposition via the catalytic low-temperature combustion method using a catalyst loaded with precious metals. However, precious metals are rare and expensive, and they cause issues such as the generation of environmentally harmful byproducts such as NOx and N₂O, as well as high carbon dioxide generation and environmental impact during ammonia decomposition. This has led to the need for alternative catalysts.

Manganese oxide catalyst (under development)

NBC Meshtec, in collaboration with Toru Murayama (Professor, Institute for Catalysis, Hokkaido University) and others, and Kazuya Yamaguchi (Professor, Graduate School of Engineering, The University of Tokyo), is developing inexpensive and environmentally clean manganese oxide catalysts that do not use platinum.

Features

Efforts are underway to commercialize this catalyst to provide a deodorization method with reduced environmental impact, increased energy savings, and higher safety.
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Development and Testing Examples