HONO Measurement by Differential Photolysis

Abstract. Nitrous acid (HONO) has been quantitatively measured in-situ by differential photolysis at 385 and 395 nm and subsequent detection as nitric oxide (NO) by the chemiluminescence reaction with ozone (O3). The technique has been evaluated by FT-IR to provide a direct HONO measurement in a simulation chamber, and compared side-by-side with a LOng Absorption Path Optical Photometer (LOPAP) in the field. The NO/O3 chemiluminescence technique is robust, well characterized and capable of sampling at low pressure whilst solid-state converter technology allows for unattended in-situ HONO measurements in combination with fast time resolution and response.

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HONO measurement by differential photolysis

Atmospheric Measurement Techniques ◽

10.5194/amt-9-2483-2016 ◽

2016 ◽

Vol 9 (6) ◽

pp. 2483-2495 ◽

Cited By ~ 7

Author(s):

Chris Reed ◽

Charlotte A. Brumby ◽

Leigh R. Crilley ◽

Louisa J. Kramer ◽

William J. Bloss ◽

...

Keyword(s):

Nitric Oxide ◽

Fourier Transform ◽

Solid State ◽

Ir Spectroscopy ◽

Nitrous Acid ◽

Fast Time ◽

Ft Ir ◽

Simulation Chamber ◽

Ft Ir Spectroscopy

Abstract. Nitrous acid (HONO) has been quantitatively measured in situ by differential photolysis at 385 and 395 nm, and subsequent detection as nitric oxide (NO) by the chemiluminescence reaction with ozone (O3). The technique has been evaluated by Fourier transform infrared (FT-IR) spectroscopy to provide a direct HONO measurement in a simulation chamber and compared side by side with a long absorption path optical photometer (LOPAP) in the field. The NO–O3 chemiluminescence technique is robust, well characterized, and capable of sampling at low pressure, whilst solid-state converter technology allows for unattended in situ HONO measurements in combination with fast time resolution and response.

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In situ FT-IR and catalytic studies of the selective reduction of nitric oxide by carbon monoxide over Au/NaY catalysts: Effect of adding hydrogen to the reaction gas mixture

Studies in Surface Science and Catalysis - Progress in Zeolite and Microporous Materials, Preceedings of the 11th International Zeolite Conference ◽

10.1016/s0167-2991(97)80801-4 ◽

1997 ◽

pp. 1571-1578 ◽

Cited By ~ 3

Author(s):

Tarek M. Salama ◽

Ryuichiro Ohnishi ◽

Masaru Ichikawa

Keyword(s):

Nitric Oxide ◽

Carbon Monoxide ◽

Selective Reduction ◽

Gas Mixture ◽

Ft Ir

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In-situ Nitrous Acid Generation over Silica Imidazole Catalyst for Dyes Production

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.14.2.2617.247-259 ◽

2019 ◽

Vol 14 (2) ◽

pp. 247

Author(s):

Kasim Mohammed Hello ◽

Nahla Ghaze Fahad

Keyword(s):

Nuclear Magnetic Resonance ◽

Solid State ◽

Magnetic Resonance ◽

Nitrous Acid ◽

Diazonium Salt ◽

Chemical Shifts ◽

Imidazolium Chloride ◽

Acid Generation ◽

Nuclear Magnetic

The objective of this research is to prepare a new type of heterogeneous catalyst and to study its usage for in-situ nitrous acid generation to form a diazonium salt. The high pure silica (> 95%) was produced by burning the clean rice husk at 800 °C. After that, the silica was transferred to sodium silicate using 1.0 M of NaOH, followed by immobilizing with 3-(chloropropyl)triethoxysilane in a simple one-pot synthesis. Finally, the material was refluxed with (0.015 mol) of p-xylyl di-imidazolium chloride. The silicon solid-state nuclear magnetic resonance shows the Q4, Q3, T3, and T2 chemical shifts at expected position. Carbon solid-state nuclear magnetic resonance spectrum shows different peaks at different chemical shifts related to the carbon structures of the organic moieties. The catalyst is stable up to 277 ºC according to the thermal analysis. TEM images show smooth and porous regularly shaped particles with an estimation size of ca. 5 nm. Coupling reaction of aromatic compounds was carried out with a diazonium salt of aniline to yield a monoazo dye. All dyes were showed matching the elemental analysis with the theoretical calculation. Besides this, the spectrum of FT-IR and UV-Visible were recorded. The catalyst was stable, easy separation from the reaction mixture, and reusable by a simple experimental procedure. The catalyst could be used successfully for the nitrous acid generation. Copyright © 2019 BCREC Group. All rights reserved

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