Reversing flow catalytic converter for a natural gas/diesel dual fuel engine

Liu, B; Hayes, Robert E.; Checkel, M. David; Zheng, Ming; Mirosh, Edward A.

doi:10.1016/s0009-2509(00)00535-2

Cited by 60 publications

(34 citation statements)

References 33 publications

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“…In the first RFOCR system set-up, the oxidation catalyst sample used had a precious metal loading of 100 g-Pd / ft 3 . This catalyst sample was three inches long, 7/8 of and inch thick and had a cell density of 300 cells / in 2 (cpsi).…”

Section: Figure 4 Catalyst Thermocouple Orientationsmentioning

confidence: 99%

“…Periodic flow reversal oxidation is a heat trap that performs active heat recovery on the top of the heat retention capability of the catalyst bed. The conception of the catalyst with reciprocating flow was discussed theoretically and verified experimentally [1,[3][4][5][6], but the problem of the deep investigation of more appropriate operational regimes of the such kind of reciprocating system over a broad range of conditions is not solved yet. The idea of the reversing flow catalyst is quite simple.…”

Section: System Conceptmentioning

confidence: 99%

“…Refer [3] Palladium catalyst with alumina wash coat is recommended for methane oxidation. The standard size of 9.5 inches diameter and 6 inches length of Palladium catalyst is used and the space velocity for this kind of catalyst equals 50,000 hr -1 .…”

Section: Catalyst Space Velocity Calculationmentioning

confidence: 99%

“…Each of the catalysts, developed by EmeraChem, were deposited on a cordierite honeycomb with 300 cells/in 2 . The LNT catalyst contained a loading of 1.6 g/in 3 Al 2 O 3 , 100 g/ft 3 of Platinum and 0.14 g/in 3 of barium oxide. The oxidation catalyst had a coating of 1.8 g/in 3 alumina and 50 g/ft 3 of palladium metal.…”

Section: Figure 101 Exhaust Aftertreatment System Photographmentioning

confidence: 99%

“…Under fuel rich conditions, the stored NO x is released from the adsorbent and subsequently reduced to N 2 over precious metal sites. A desulfurization process must be conducted at high temperature and fuel rich conditions [3][4][5][6][7][8]. Such Lean NO x Traps have demonstrated high NO x conversion efficiencies; approaching 95%, for lean burn gasoline engines and diesel engines [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Energy Efficient Thermal Management for Natural Gas Engine Aftertreatment via Active Flow Control

Irick¹,

Nguyen²,

Naoumov³

et al. 2006

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The project is focused on the development of an energy efficient aftertreatment system capable of reducing NOx and methane by 90% from lean-burn natural gas engines by applying active exhaust flow control. Compared to conventional passive flow-through reactors, the proposed scheme cuts supplemental energy by 50%-70%. The system consists of a Lean NOx Trap (LNT) system and an oxidation catalyst. Through alternating flow control, a major amount of engine exhaust flows through a large portion of the LNT system in the absorption mode, while a small amount of exhaust goes through a small portion of the LNT system in the regeneration or desulfurization mode. By periodically reversing the exhaust gas flow through the oxidation catalyst, a higher temperature profile is maintained in the catalyst bed resulting in greater efficiency of the oxidation catalyst at lower exhaust temperatures. The project involves conceptual design, theoretical analysis, computer simulation, prototype fabrication, and empirical studies.This report details the progress during the first twelve months of the project. The primary activities have been to develop the bench flow reactor system, develop the computer simulation and modeling of the reverse-flow oxidation catalyst, install the engine into the test cell, and begin design of the LNT system. iv

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Section: Figure 4 Catalyst Thermocouple Orientationsmentioning

confidence: 99%

Section: System Conceptmentioning

confidence: 99%

Section: Catalyst Space Velocity Calculationmentioning

confidence: 99%

Section: Figure 101 Exhaust Aftertreatment System Photographmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Energy Efficient Thermal Management for Natural Gas Engine Aftertreatment via Active Flow Control

Irick¹,

Nguyen²,

Naoumov³

et al. 2006

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What is the leanest stream to sustain a nonadiabatic loop reactor: Analysis and methane combustion experiments

2016

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While previous studies experimentally demonstrated that loop reactor (LR) can be sustained with a lean feed (using ethylene combustion) and have analyzed the single‐reaction adiabatic case, this work analyzes the effects of heat loss and of reactor size to determine the leanest stream (expressed in terms of adiabatic temperature rise ΔTlim) that will sustain the operation. For an adiabatic infinitely long reactor ΔTlim→0 while for a finite reactor ΔTlim scales as (1 + Pe/4)−1 where Pe = Luρcpf/k, and heat loss increases this limit by (β/Pe)1/2. Thus, a good design of a LR will aim to decrease conductivity (k) and radial heat‐transfer coefficient (β) while increasing throughput (u) and reactor length. This article is also the first experimental demonstration of auto‐thermal operation in a LR for catalytic abatement of low‐concentration of methane, showing the leanest stream to be of 8000 ppm vs. 33,000 ppm in a once‐through reactor. Experimental combustion results of methane and of ethylene are compared with model predictions. © 2016 American Institute of Chemical Engineers AIChE J, 63: 2030–2042, 2017

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Mathematical model of thermal storage catalytic combustion process of ethyl acetate on platinum/palladium molecular sieve support reaction system

Jiang

Kang

Chen

et al. 2020

Asia-Pacific J Chem Eng

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This work focused on the mathematical model establishment and accurately forecast the conditions of thermal storage catalytic combustion about ethyl acetate, using platinum/palladium molecular sieve support reaction system. According to the physical properties of ethyl acetate and the mass transfer and continuity equations, a mathematical model was established using FORTRAN programming. The mathematical model was used to calculate the removal rate of ethyl acetate at switching time and processing flow rate. Under the same conditions, the model and experiment proved that the removal rate of ethyl acetate was above 98%, indicating that the model provides a valid data for a deeper understanding of the thermal storage catalytic combustion. The accuracy of the model is verified by the experimentally measured bed temperature when compared with the calculated. This work can provide a valuable tool to prevent the reactor from ‘over temperature' or ‘flaming out' in thermal storage catalytic combustion process.

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Reversing flow catalytic converter for a natural gas/diesel dual fuel engine

Cited by 60 publications

References 33 publications

Energy Efficient Thermal Management for Natural Gas Engine Aftertreatment via Active Flow Control

Energy Efficient Thermal Management for Natural Gas Engine Aftertreatment via Active Flow Control

What is the leanest stream to sustain a nonadiabatic loop reactor: Analysis and methane combustion experiments

Mathematical model of thermal storage catalytic combustion process of ethyl acetate on platinum/palladium molecular sieve support reaction system

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