Achieving+95% Ammonia Purity by Optimizing the Absorption and Desorption Conditions of Supported Metal Halides

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F22%3A00355901" target="_blank" >RIV/68407700:21220/22:00355901 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1021/acssuschemeng.1c05668" target="_blank" >https://doi.org/10.1021/acssuschemeng.1c05668</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acssuschemeng.1c05668" target="_blank" >10.1021/acssuschemeng.1c05668</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Achieving+95% Ammonia Purity by Optimizing the Absorption and Desorption Conditions of Supported Metal Halides

Popis výsledku v původním jazyce

The worldwide push toward the reduction of carbon dioxide emissions has been the main motivation for finding a sustainable alternative to the conventional Haber-Bosch ammonia production process that has a significant carbon footprint. In this work, we focused on ammonia separation by replacing the condenser with an absorber column packed with metal halide solid absorbents. These salts had shown promise in selective separation of NH3 in the past, but more information on the cyclic operation and ammonia desorption conditions was needed. We used an automated apparatus equipped with an absorption column packed with either silica, supported CaCl2, or supported MgCl2 to explore the optimal absorption/ desorption conditions (pressure and temperature swings). Primarily, we are reporting on the working capacity of various sorbents for cyclic ammonia separation. Additionally, we investigated the effect of sweep gas on the desorption efficiency and compared the absorbent performance among each other in terms of absorption working capacity and the purity of the ammonia product stream. We were able to achieve an NH3 stream with a purity of over 95%; in some of the tests, we achieved a coordination number as high as 2.5 mol(NH3)/mol(salt), which is the highest ever reported for a dynamic flow breakthrough test. Our experiments further prove the significant potential that these salts possess to replace phase change condensation in the conventional ammonia synthesis-not only in a greener fashion but also more efficiently with a decreased equipment size, with reduced energy input in smaller scales, and with more flexibility to follow intermittent renewables.

Název v anglickém jazyce

Achieving+95% Ammonia Purity by Optimizing the Absorption and Desorption Conditions of Supported Metal Halides

Popis výsledku anglicky

The worldwide push toward the reduction of carbon dioxide emissions has been the main motivation for finding a sustainable alternative to the conventional Haber-Bosch ammonia production process that has a significant carbon footprint. In this work, we focused on ammonia separation by replacing the condenser with an absorber column packed with metal halide solid absorbents. These salts had shown promise in selective separation of NH3 in the past, but more information on the cyclic operation and ammonia desorption conditions was needed. We used an automated apparatus equipped with an absorption column packed with either silica, supported CaCl2, or supported MgCl2 to explore the optimal absorption/ desorption conditions (pressure and temperature swings). Primarily, we are reporting on the working capacity of various sorbents for cyclic ammonia separation. Additionally, we investigated the effect of sweep gas on the desorption efficiency and compared the absorbent performance among each other in terms of absorption working capacity and the purity of the ammonia product stream. We were able to achieve an NH3 stream with a purity of over 95%; in some of the tests, we achieved a coordination number as high as 2.5 mol(NH3)/mol(salt), which is the highest ever reported for a dynamic flow breakthrough test. Our experiments further prove the significant potential that these salts possess to replace phase change condensation in the conventional ammonia synthesis-not only in a greener fashion but also more efficiently with a decreased equipment size, with reduced energy input in smaller scales, and with more flexibility to follow intermittent renewables.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

ACS Sustainable Chemistry & Engineering

ISSN

2168-0485

e-ISSN

2168-0485

Svazek periodika

10

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

204-212

Kód UT WoS článku

000734272000001

EID výsledku v databázi Scopus

2-s2.0-85121918824