English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

In this work, the modified Mn-based NH 3 -SCR (NH 3  low-temperature selective catalytic reduction) catalysts with excellent NO conversion and N 2  selectivity be designed. N 2  yield was hardly more than 75 % over MnO  x  /TiO 2  for NH 3 -SCR reaction, whereas the NH 3 -SCR performance has been significantly improved by using 50 wt.% HPW (H 3 PW 12 O 40 )-MnO  x  /TiO 2 . 100 % NO conversion and more than 95 % N 2  yield was obtained in wide operating temperature window (150–400°C), suggesting that the addition of HPW could effectively improve the NO reduction conversion. After that, the catalysts were further characterized by XRD, H 2 -TPR, XPS and  in situ  DRIFT. DRIFT analysis implied that the introduction of HPW significantly improve the capacity of NH 4  +  species adsorbed on Brønsted acid sites accompanied with inhibiting the formation and consumption of nitrite species. It proved that the non-selective catalytic reduction reaction over HPW-MnO  x  /TiO 2  catalysts are restrained. HPW could accelerate the formation and consumption of NH 4  +  species adsorbed on Brønsted acid sites with deactivation of nitrate species. In addition, NH 3 (ad) could be hardly oxidized to NH species and then reacted with nitrate species (L-H mechanism) and gaseous NO (E-R mechanism). More importantly, the oxidation of NH 3  was also suppressed, which plays a dominate role to form N 2 O above 300°C. Besides, the deactivation of potassium poisoning on the SCR activity significantly weakened for modified samples compared to parent catalyst.

international journal of chemical reactor engineering

Efficiency of Phosphotungstic Acid Modified Mn-Based Catalysts to Promote Activity and N 2  Formation for Selective Catalytic Reduction of NO with Ammonia