Combined Fixed-Bed Reactor and In Situ DRIFTS Tests of NO Adsorption on a NOx Storage-Reduction System Catalyst

2013 ◽  
Vol 37 (2) ◽  
pp. 204-212 ◽  
Author(s):  
Dong L. Wu ◽  
Valerie Tschamber ◽  
Lionel Limousy ◽  
Laure Michelin ◽  
Alexandre Westermann ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Nox Storage ◽  
Fixed Bed Reactor ◽  
No Adsorption ◽  
In Situ Drifts ◽  
Nox Storage Reduction ◽  
Reduction System

scholarly journals NOx Storage on BaTi0.8Cu0.2O3 Perovskite Catalysts: Addressing a Feasible Mechanism

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2133
Author(s):  
Vicente Albaladejo-Fuentes ◽  
María-Salvadora Sánchez-Adsuar ◽  
James A. Anderson ◽  
María-José Illán-Gómez
Keyword(s):  
Catalyst Activity ◽  
No Oxidation ◽  
Nox Storage ◽  
Storage Process ◽  
No Adsorption ◽  
In Situ Drifts ◽  
Storage Mechanism ◽  
Main Pathway ◽  
Model Nsr Catalysts

The NOx storage mechanism on BaTi0.8Cu0.2O3 catalyst were studied using different techniques. The results obtained by XRD, ATR, TGA and XPS under NOx storage–regeneration conditions revealed that BaO generated on the catalyst by decomposition of Ba2TiO4 plays a key role in the NOx storage process. In situ DRIFTS experiments under NO/O2 and NO/N2 show that nitrites and nitrates are formed on the perovskite during the NOx storage process. Thus, it seems that, as for model NSR catalysts, the NOx storage on BaTi0.8Cu0.2O3 catalyst takes place by both “nitrite” and “nitrate” routes, with the main pathway being highly dependent on the temperature and the time on stream: (i) at T < 350 °C, NO adsorption leads to nitrites formation on the catalyst and (ii) at T > 350 °C, the catalyst activity for NO oxidation promotes NO2 generation and the nitrate formation.

scholarly journals Real-Time Control of a Catalytic Solid in a Fixed-Bed Reactor Based on In Situ Spectroscopy

2007 ◽  
Vol 46 (28) ◽  
pp. 5412-5416 ◽  
Author(s):  
Simona M. Bennici ◽  
Bas M. Vogelaar ◽  
T. Alexander Nijhuis ◽  
Bert M. Weckhuysen
Keyword(s):  
Real Time ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
In Situ Spectroscopy ◽  
Real Time Control ◽  
Time Control

CO2 Capture Using Calcium Oxide Applicable to In-Situ Separation of CO2 From H2 Production Processes

2013 ◽  
Author(s):  
Saeed Danaei Kenarsari ◽  
Yuan Zheng
Keyword(s):  
Calcium Oxide ◽  
Co2 Capture ◽  
Fixed Bed ◽  
H2 Production ◽  
Fixed Bed Reactor ◽  
Capture Process ◽  
Conversion Rates ◽  
In Situ Separation ◽  
Separation Of Co2

A lab-scale CO2 capture system is designed, fabricated, and tested for performing CO2 capture via carbonation of very fine calcium oxide (CaO) with particle size in micrometers. This system includes a fixed-bed reactor made of stainless steel (12.7 mm in diameter and 76.2 mm long) packed with calcium oxide particles dispersed in sand particles; heated and maintained at a certain temperature (500–550°C) during each experiment. The pressure along the reactor can be kept constant using a back pressure regulator. The conditions of the tests are relevant to separation of CO2 from combustion/gasification flue gases and in-situ CO2 capture process. The inlet flow, 1% CO2 and 99% N2, goes through the reactor at the flow rate of 150 mL/min (at standard conditions). The CO2 percentage of the outlet gas is monitored and recorded by a portable CO2 analyzer. Using the outlet composition, the conversion of calcium oxide is figured and employed to develop the kinetics model. The results indicate that the rates of carbonation reactions considerably increase with raising the temperature from 500°C to 550°C. The conversion rates of CaO-carbonation are well fitted to a shrinking core model which combines chemical reaction controlled and diffusion controlled models.

scholarly journals Real-Time Control of a Catalytic Solid in a Fixed-Bed Reactor Based on In Situ Spectroscopy

2007 ◽  
Vol 119 (28) ◽  
pp. 5508-5512 ◽  
Author(s):  
Simona M. Bennici ◽  
Bas M. Vogelaar ◽  
T. Alexander Nijhuis ◽  
Bert M. Weckhuysen
Keyword(s):  
Real Time ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
In Situ Spectroscopy ◽  
Real Time Control ◽  
Time Control

In Situ Synthesis of Cu-SAPO-34/Cordierite with Ultrasonic Treatment and its Property of NOx Removal

2013 ◽  
Vol 743-744 ◽  
pp. 449-454 ◽  
Author(s):  
Zhi Juan Gao ◽  
Wei Ren Bao ◽  
Li Ping Chang ◽  
Jian Cheng Wang
Keyword(s):  
Ultrasonic Treatment ◽  
Good Condition ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
X Ray Diffraction ◽  
Monolithic Catalyst ◽  
X Ray ◽  
Nox Conversion ◽  
Aging Property

A Cu-SAPO-34/cordierite monolithic catalyst was prepared by in-situ hydrothermal method. The effects of ultrasonic treatment were mainly investigated during the preparing process. The removal of NOX was evaluated using a fixed-bed reactor. X-ray diffraction, scanning electron microscopy were used to characterize the samples showing that the crystallinity of Cu-SAPO-34 molecular sieve have increased after ultrasonic treatment. The Cu-SAPO-34/cordierite prepared by ultrasonic treatment showed higher de-NOx activity and stronger anti-aging property. NOx conversion could reach more than 80% between 440 and 560°C over the fresh Cu-SAPO-34/cordierite catalyst with ultrasonic treatment (600 W, 2 h) and the highest conversion was 86%, however, the highest conversion was only 76% over the Cu-SAPO-34/cordierite catalyst without ultrasonic treatment. After aging (treated for 15 h at 720 °C in the presence of 200 ppm SO2 and 10% vapor), NOx conversion reached more than 45% between 400 and 520 °C over the catalyst with ultrasonic treatment and the highest conversion was 57%, however, the highest conversion was only 43% over the catalyst without ultrasonic treatment. The XRD and SEM results indicated that the structure and morphology of Cu-SAPO-34/cordierite monolithic catalyst kept in good condition after aging.

Development of NOx Storage Reduction System for a Dimethyl Ether Engine

2004 ◽  
Author(s):  
Seang-wock Lee ◽  
Yoshio Sato ◽  
Toshimitsu Takayanagi ◽  
Akira Noda ◽  
Toshiro Yamamoto
Keyword(s):  
Dimethyl Ether ◽  
Nox Storage ◽  
Nox Storage Reduction ◽  
Reduction System

Development of NOx Storage Reduction System for a Heavy-Duty Dimethyl Ether Engine

2005 ◽  
Author(s):  
Seang-wock Lee ◽  
Yoshio Sato ◽  
Toshimitsu Takayanagi ◽  
Hisakazu Suzuki
Keyword(s):  
Dimethyl Ether ◽  
Nox Storage ◽  
Heavy Duty ◽  
Nox Storage Reduction ◽  
Reduction System
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