New Findings in Hydrothermal Deactivation Research on the Vanadia-Selective Catalytic Reduction Catalyst.

ABSTRACT: Considering the risks of hydrothermal deterioration in vehicles, power plants, and oceangoing vessels, V₂O₅-WO₃/TiO₂ catalysts were subject to hydrothermal and thermal aging at 600, 625, 635, and 650 °C for 4-48 h. The different ratio and significant loss of active sites are main reasons for catalyst deactivation. Both Lewis and Brønsted acid sites are involved in the selective catalytic reduction reaction. Brønsted acid sites are more susceptible. High temperature plays a major role in the aging. It causes sintering, particle growth, and the anatase phase transition. Phase transformation turns out to be less important than sintering. Sintering leads to the reduction of the BET surface area, which in turn causes decrease of NH₃ adsorpt

SUBMITTER: Li X 

PROVIDER: S-EPMC6648397 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature