Mixed Oxides: Role of Washing and Residual Ions in Transesterification Reactions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F25%3A00640614" target="_blank" >RIV/67985858:_____/25:00640614 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216275:25310/25:39923105 RIV/61989100:27730/25:10259658

Výsledek na webu

<a href="https://pubs.acs.org/doi/pdf/10.1021/acsomega.5c08243?ref=article_openPDF" target="_blank" >https://pubs.acs.org/doi/pdf/10.1021/acsomega.5c08243?ref=article_openPDF</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsomega.5c08243" target="_blank" >10.1021/acsomega.5c08243</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mixed Oxides: Role of Washing and Residual Ions in Transesterification Reactions

Popis výsledku v původním jazyce

The mixed oxides (MOs) serve as catalysts for many reactions such as transesterification, transformation of ethanol to butanol, catalytic cracking, or dehydrogenation reactions. MOs are usually synthesized from hydrotalcites, which are often prepared by the coprecipitation method. However, some chemicals can remain after coprecipitation and influence the properties of MOs, includingnsubsequent applications. The novelty lies in investigating how the residual chemicals affect the properties of hydrotalcites, MOs, andnthe transesterification reaction (conducted in both one- and twostep processes). Mg−Al and Mg−Fe hydrotalcites were synthesizednfrom chloride and nitrate salts via coprecipitation with NaOH, followed by washing with varying amounts of redistilled water,nresulting in variations in the sodium ion content (more water, less sodium ions). All materials were characterized by many analytical methods such as X-ray diffraction, metal determination, scanning electron microscopy, textural properties, and basicity determination. MOs synthesized from chlorides contained stable NaCl, which is not catalytically active, and blocked the pores, leading to a reduced surface area and, consequently, a lower transesterification yield. In contrast, MOs prepared from nitrates contained unstable NaNO3, which decomposed during calcination and, upon exposure to water, formed basic species (NaOH) that promoted transesterification. Therefore, the effect of residual sodium varies depending on the material precursors. This understanding helps us to improve the synthesis of hydrotalcites and mixed oxides.

Název v anglickém jazyce

Mixed Oxides: Role of Washing and Residual Ions in Transesterification Reactions

Popis výsledku anglicky

The mixed oxides (MOs) serve as catalysts for many reactions such as transesterification, transformation of ethanol to butanol, catalytic cracking, or dehydrogenation reactions. MOs are usually synthesized from hydrotalcites, which are often prepared by the coprecipitation method. However, some chemicals can remain after coprecipitation and influence the properties of MOs, includingnsubsequent applications. The novelty lies in investigating how the residual chemicals affect the properties of hydrotalcites, MOs, andnthe transesterification reaction (conducted in both one- and twostep processes). Mg−Al and Mg−Fe hydrotalcites were synthesizednfrom chloride and nitrate salts via coprecipitation with NaOH, followed by washing with varying amounts of redistilled water,nresulting in variations in the sodium ion content (more water, less sodium ions). All materials were characterized by many analytical methods such as X-ray diffraction, metal determination, scanning electron microscopy, textural properties, and basicity determination. MOs synthesized from chlorides contained stable NaCl, which is not catalytically active, and blocked the pores, leading to a reduced surface area and, consequently, a lower transesterification yield. In contrast, MOs prepared from nitrates contained unstable NaNO3, which decomposed during calcination and, upon exposure to water, formed basic species (NaOH) that promoted transesterification. Therefore, the effect of residual sodium varies depending on the material precursors. This understanding helps us to improve the synthesis of hydrotalcites and mixed oxides.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

ACS Omega

ISSN

2470-1343

e-ISSN

2470-1343

Svazek periodika

10

Číslo periodika v rámci svazku

44

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

53341-53349

Kód UT WoS článku

001603067400001

EID výsledku v databázi Scopus

2-s2.0-105021256488