2 research outputs found
Ambient Temperature Hydrocarbon Selective Catalytic Reduction of NO<sub><i>x</i></sub> Using Atmospheric Pressure Nonthermal Plasma Activation of a Ag/Al<sub>2</sub>O<sub>3</sub> Catalyst
Atmospheric pressure nonthermal-plasma-activated
catalysis for
the removal of NO<sub><i>x</i></sub> using hydrocarbon selective
catalytic reduction has been studied utilizing toluene and <i>n</i>-octane as the hydrocarbon reductant. When the plasma was
combined with a Ag/Al<sub>2</sub>O<sub>3</sub> catalyst, a strong
enhancement in activity was observed when compared with conventional
thermal activation with high conversions of both NO<sub><i>x</i></sub> and hydrocarbons obtained at temperature ≤250 °C,
where the silver catalyst is normally inactive. Importantly, even
in the absence of an external heat source, significant activity was
obtained. This low temperature activity provides the basis for applying
nonthermal plasmas to activate emission control catalysts during cold
start conditions, which remains an important issue for mobile and
stationary applications
An efficient microwave-assisted chelation (MWAC) post-synthetic modification method to produce hierarchical Y zeolites
We report a low-cost, highly energy efficient microwave-assisted chelation (MWAC) method, which enabled the post-synthetic modification of synthetic zeolites for adopting hierarchical structures within minutes. Exemplified by Zeolite Y, hierarchical Y zeolites prepared in this way showed exceptional specific external surface areas of >300 m2 g−1 and mesopore volumes of >0.46 cm3 g−1. Comparative assessments revealed that developed zeolites have shown significantly improved catalytic activities for catalysis involving large substrates, such as catalytic cracking and hydrocracking of plastics