Isocyanic acid hydrolysis and ammonia-SCR reaction over hydrothermally aged Cu-ZSM5 Ibaraki University / Japan Automotive Research Institute

Format:

Book

Conference/Event

Author/Creator:

Matsuoka, Masahiro, author.

Contributor:

Kitamura, Takaaki

Konno, Mitsuru

Obuchi, Akira

Sakaida, Satoshi

Tanaka, Kōtarō

Tsuchida, Jun

Conference Name:

2019 JSAE/SAE Powertrains, Fuels and Lubricants (2019-08-26 : Kyoto, Japan)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2019

Summary:

For developing complicated after-treatment equipment for diesel-engine vehicles, such as urea-selective catalytic reduction (urea-SCR) systems, construction of a reaction model that can accurately predict ammonia (NH3) formation from urea is required. Hydrolysis of isocyanic acid (HNCO) is an important intermediate reaction in NH3 formation from urea. In our previous studies [1], a new rate constant for HNCO hydrolysis over fresh Cu-ZSM5 was derived using the measurements of the reaction rate of HNCO hydrolysis with high-purity HNCO formed from cyanuric acid. In this study, the reaction rates of the HNCO hydrolysis and NH3-SCR reactions were measured over a hydrothermally aged Cu-ZSM5 catalyst. A steady-state flow reactor equipped with a Fourier transform infrared spectrometer (FTIR) was employed to obtain the reaction rate of the HNCO hydrolysis and NH3-SCR reactions. Results showed that the reaction rate of HNCO hydrolysis over the hydrothermally aged catalyst was faster than that over the fresh catalyst, while the reaction rate of NOx reduction over the hydrothermally aged catalyst was slower than that over the fresh catalyst. Simulations performed using the obtained rate constant indicated that HNCO hydrolysis over the hydrothermally aged Cu-ZSM5 catalyst was not the rate-determining reaction in NOx reduction

Notes:

Vendor supplied data

Publisher Number:

2019-01-2234

Access Restriction:

Restricted for use by site license