Mg-Fe mixed oxides and their rehydrated mixed oxides as catalysts for transesterification

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F17%3A39912062" target="_blank" >RIV/00216275:25310/17:39912062 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jclepro.2017.05.199" target="_blank" >http://dx.doi.org/10.1016/j.jclepro.2017.05.199</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jclepro.2017.05.199" target="_blank" >10.1016/j.jclepro.2017.05.199</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mg-Fe mixed oxides and their rehydrated mixed oxides as catalysts for transesterification

Popis výsledku v původním jazyce

The Mg-Fe hydrotalcites with a constant molar ratio (Mg/Fe 2.5:1) were synthesized from two types of precursors (chlorides and nitrates of metals) and thermally pre-treated at different temperatures (500 and 600 degrees C). It was found that the crystallite size of hydrotalcite increases with an increasing aging time. The synthesized materials were tested in the transesterification of rapeseed oil. All synthesized materials were characterized by several techniques such as X-ray Powder Diffraction, thermogravimetric analysis with a mass spectrometer, the determination of specific surface area, pore size distribution and basicity of oxides. It was found that crystallite size, the amount of the crystalline phase and specific surface area were almost the same for both precursors. After calcination, the mixed oxides from the nitrate precursors revealed higher amount of basic sites and population of stronger basic sites than from the chloride precursors. The rehydration, i.e. the restoration of a layered structure, successfully proceeded for hydrotalcite synthesized from nitrates calcined at 500 degrees C. However, in the case of chlorides, the hydrotalcite had to be calcined at 600 degrees C so that the rehydration was successful. The materials synthesized from chlorides have a lower conversion (25%) than material synthesis from nitrates (60%).

Název v anglickém jazyce

Mg-Fe mixed oxides and their rehydrated mixed oxides as catalysts for transesterification

Popis výsledku anglicky

The Mg-Fe hydrotalcites with a constant molar ratio (Mg/Fe 2.5:1) were synthesized from two types of precursors (chlorides and nitrates of metals) and thermally pre-treated at different temperatures (500 and 600 degrees C). It was found that the crystallite size of hydrotalcite increases with an increasing aging time. The synthesized materials were tested in the transesterification of rapeseed oil. All synthesized materials were characterized by several techniques such as X-ray Powder Diffraction, thermogravimetric analysis with a mass spectrometer, the determination of specific surface area, pore size distribution and basicity of oxides. It was found that crystallite size, the amount of the crystalline phase and specific surface area were almost the same for both precursors. After calcination, the mixed oxides from the nitrate precursors revealed higher amount of basic sites and population of stronger basic sites than from the chloride precursors. The rehydration, i.e. the restoration of a layered structure, successfully proceeded for hydrotalcite synthesized from nitrates calcined at 500 degrees C. However, in the case of chlorides, the hydrotalcite had to be calcined at 600 degrees C so that the rehydration was successful. The materials synthesized from chlorides have a lower conversion (25%) than material synthesis from nitrates (60%).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/GA15-21817S" target="_blank" >GA15-21817S: Analýza vztahu mezi strukturou/basicitou Mg/Al, Ca/Al a Zn/Al směsných oxidů a jejich aktivitou v aldol kondenzaci a transesterifikaci</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Cleaner Production

ISSN

0959-6526

e-ISSN

—

Svazek periodika

161

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

9

Strana od-do

1423-1431

Kód UT WoS článku

000407655400123

EID výsledku v databázi Scopus

2-s2.0-85020443755