Author: Pranav Khanna
Publisher:
ISBN:
Category : Nitrogen oxides
Languages : en
Pages : 254

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Author: Anna Lindholm
Publisher:
ISBN: 9789173853446
Category :
Languages : en
Pages : 72

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Author: Louise Olsson
Publisher:
ISBN:
Category :
Languages : en
Pages : 47

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Author: Björn Westerberg
Publisher:
ISBN: 9789171979131
Category :
Languages : en
Pages : 50

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Author: Ashok Kumar
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 364

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Author: Richa Raj
Publisher:
ISBN:
Category : Chemical engineering
Languages : en
Pages :

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Book Description
The integrated LNT/SCR system is a promising technology for the reduction of NOx emission from the exhaust of lean-burn or diesel engine vehicles. The LNT/SCR operating concept involves the storage of NOx during the lean phase while unreacted hydrocarbons (C3H6, C2H4 etc.) and generated NH3 exit the LNT during the rich phase. In addition to NH3, olefinic hydrocarbons and/or partially oxidized species that break through the LNT may also adsorb on the SCR catalyst leading to additional NOx reduction by those species. In first part of the work, we performed bench-flow reactor and in-situ DRIFTS experiments to elucidate the propylene + NO + O2 reaction system on Cu-SSZ13 (chabazite) monolithic catalyst. Experiments were conducted under both steady state and transient conditions for application relevant feed conditions. Based on the bench-flow reactor studies and in-situ DRIFTS experiments a phenomenological reaction mechanism is proposed that involves reaction between oxygenates (partially oxidized hydrocarbon species) and NO to form isocyanates species ( -NCO), detected by DRIFTS which are further reduced to N2. The experimental work is followed by developing a mechanistic-based kinetic model is developed for selective catalytic reduction of NO with C3H6 on Cu chabazite (Cu-SSZ13) monolithic catalyst based on bench scale flow reactor studies and in-situ DRIFTS measurements. The kinetic model was developed in steps, starting with steady-state CO oxidation, followed by C3H6 oxidation, and then the C3H6 + NO + O2 reaction system. The models for CO+O2, C3H6+O2 and C3H6+NO+O2 were also validated using a new set of steady state experiments. The model provides insight about non-NH3 pathways (hydrocarbons, oxygenates, isocyanates etc.) for NOx reduction across the SCR. Finally, we developed a global kinetic model for co oxidation of CO and C3H6 over Pt/Al2O3 monolithic catalyst. The kinetic model developed is used to elucidate the dynamic and steady state hysteresis behavior observed during oxidation of CO+C3H6 mixture on Pt/Al2O3.

Author: Luca Lietti
Publisher: Royal Society of Chemistry
ISBN: 1788014758
Category : Science
Languages : en
Pages : 434

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Book Description
Vehicle exhaust emissions, particularly from diesel cars, are considered to be a significant problem for the environment and human health. Lean NOx Trap (LNT) or NOx Storage/Reduction (NSR) technology is one of the current techniques used in the abatement of NOx from lean exhausts. Researchers are constantly searching for new inexpensive catalysts with high efficiency at low temperatures and negligible fuel penalties, to meet the challenges of this field. This book will be the first to comprehensively present the current research on this important area. Covering the technology used, from its development in the early 1990s up to the current state-of-the-art technologies and new legislation. Beginning with the fundamental aspects of the process, the discussion will cover the real application standard through to the detailed modelling of full scale catalysts. Scientists, academic and industrial researchers, engineers working in the automotive sector and technicians working on emission control will find this book an invaluable resource.

Author: Jazaer Dawody
Publisher:
ISBN: 9789172916210
Category :
Languages : en
Pages : 72

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Author: Hua Guo
Publisher: Springer
ISBN: 3662478455
Category : Science
Languages : en
Pages : 207

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Book Description
In this Festschrift dedicated to the 85th birthday of Professor Guosen Yan, selected researchers in theoretical chemistry present research highlights on major developments in the field. Originally published in the journal Theoretical Chemistry Accounts, these outstanding contributions are now available in a hardcover print format, as well as a special electronic edition. This volume provides valuable content for all researchers in theoretical chemistry, and will especially benefit those research groups and libraries with limited access to the journal.

Author: Hanna Sjövall
Publisher:
ISBN: 9789173853453
Category :
Languages : en
Pages : 68

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