scholarly journals Comparison of Synthetic and Natural Zeolite Catalysts’ Behavior in the Production of Lactic Acid and Ethyl Lactate from Biomass-Derived Dihydroxyacetone

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1006
Author(s):  
Natalia Sobuś ◽  
Izabela Czekaj
Keyword(s):  
Lactic Acid ◽  
Natural Zeolite ◽  
Carbon Balance ◽  
Zeolite Beta ◽  
Synthetic Zeolite ◽  
Zeolite Catalysts ◽  
Ethyl Lactate ◽  
Hydrothermal Conditions ◽  
Natural Clinoptilolite ◽  
Zeolite Modification

This article presents the results of the conversion of dihydroxyacetone (DHA) to lactic acid (LA) with the use of zeolite catalysts. For this purpose, synthetic zeolite beta (BEA) and natural clinoptilolite (CLI) were used as a matrix. The zeolites were modified with various metals (Sn, Fe, Cu and Zn) during ion exchange under hydrothermal conditions. The DHA conversion process with the participation of metal-functionalized zeolites allowed us to obtain intermediates, i.e., pyruvic aldehyde (PAL), which during the further reaction was transformed into a mixture of products such as ethyl lactate (EL), pyruvic aldehyde (PA), lactic acid and ethyl acetate (EA). The best selectivity towards lactic acid was achieved using Sn-CLI (100%) > Na-BEA (98.7%) > Sn-BEA (95.9%) > Cu-BEA (92.9%), ethyl lactate using Cu-CLI, and pyruvic aldehyde using the Zn-BEA catalyst. In the case of a natural zeolite, modification with Sn is promising for obtaining a pure lactic acid with a relatively good carbon balance.

scholarly journals REDUCTION OF METAL CATIONS CONTENT FROM THE AQUEOUS SOLUTIONS BY SORBENTS

2021 ◽  
Vol 2021 (6) ◽  
pp. 5307-5311
Author(s):  
IVETA PANDOVA ◽  
◽  
MIROSLAV RIMAR ◽  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Natural Zeolite ◽  
Metal Cations ◽  
Sorption Kinetics ◽  
Synthetic Zeolite ◽  
Natural Zeolites ◽  
Chemically Treated ◽  
Synthetic Zeolites

The article presents the results of research on reducing the concentration of heavy metals, such as copper and nickel, on natural zeolite in comparison with synthetic zeolite and chemically treated natural zeolite. The reduction of the content of specific types of heavy metals from aqueous solutions was investigated by the method of sorption kinetics. The results indicate the ability of natural zeolites to compete with synthetic zeolites.

scholarly journals Hydrothermal Transformation of Natural Zeolite from Ende-NTT and Its Application as Adsorbent of Cationic Dye

2018 ◽  
Vol 16 (2) ◽  
pp. 138 ◽  
Author(s):  
Yulius Dala Ngapa ◽  
Sri Sugiarti ◽  
Zaenal Abidin
Keyword(s):  
Adsorption Capacity ◽  
Hydrothermal Method ◽  
Natural Zeolite ◽  
Hydrothermal Process ◽  
Exchange Capacity ◽  
Synthetic Zeolite ◽  
Crystal Formation ◽  
Isothermal Adsorption ◽  
Hydrothermal Transformation ◽  
Equilibrium Process

A synthetic zeolite was produced from natural zeolite from Ende-Nusa Tenggara Timur (NTT) by hydrothermal method. This study aims to produce synthetic zeolite from Ende natural zeolite to remove cation dye through the adsorption process. Temperature of crystal formation (ageing) was performed at 60 °C for 6 h and hydrothermal process was at 100 °C for 24 h. The natural zeolite produced synthetic NaP1 and synthetic Faujasite. Based on the research results, the synthesis of zeolite by the hydrothermal method can enhance the adsorption capacity and Cation Exchange Capacity (CEC). The adsorption capacity in the natural zeolites of type ZG, ZL and ZC before the hydrothermal process were 17.289, 17.276, and 16.483 mg/g, respectively, and after hydrothermal they increased to 37.398, 37.369 and 37.362 mg/g, respectively. In addition, the CEC increased from 84.154, 81.042, and 77.474 cmol/kg, respectively, to 244.063, 216.354, and 211.432 cmol/kg, respectively. The Langmuir model most closely matched the isothermal adsorption equilibrium process.

scholarly journals Design of Stable Palladium-Based Zeolite Catalysts for Complete Methane Oxidation by Postsynthesis Zeolite Modification

ACS Catalysis ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 2303-2312 ◽  
Author(s):  
Andrey W. Petrov ◽  
Davide Ferri ◽  
Oliver Kröcher ◽  
Jeroen A. van Bokhoven
Keyword(s):  
Methane Oxidation ◽  
Zeolite Catalysts ◽  
Zeolite Modification

scholarly journals The cooperative effect of Lewis and Brønsted acid sites on Sn-MCM-41 catalysts for the conversion of 1,3-dihydroxyacetone to ethyl lactate

2019 ◽  
Vol 21 (12) ◽  
pp. 3383-3393 ◽  
Author(s):  
Kyung Duk Kim ◽  
Zichun Wang ◽  
Yijiao Jiang ◽  
Michael Hunger ◽  
Jun Huang
Keyword(s):  
Lactic Acid ◽  
Organic Synthesis ◽  
Biodegradable Polymers ◽  
Acid Sites ◽  
Cooperative Effect ◽  
Ethyl Lactate ◽  
Bronsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Mcm 41

Lactic acid and alkyl lactates are widely applied in the production of food, cosmetics, pharmaceuticals, organic synthesis and biodegradable polymers.

scholarly journals Biocycle Fermentation Based on Lactic Acid Bacteria and Yeast for the Production of Natural Ethyl Lactate

ACS Omega ◽  
2019 ◽  
Vol 4 (14) ◽  
pp. 16009-16015 ◽  
Author(s):  
Xujuan Li ◽  
Xuanni Zhang ◽  
Huali Jian ◽  
Xuefeng Xu ◽  
Yongkang Xi
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Ethyl Lactate

PREPARATION AND CHARACTERIZATION OF NIMO/ACTIVE NATURAL ZEOLITE CATALYSTS

2009 ◽  
Author(s):  
KHOIRINA DWI NUGRAHANINGTYAS ◽  
DIAN MARUTO WIDJONARKO ◽  
WEGA TRI SUNARYANTI ◽  
TRIYONO
Keyword(s):  
Natural Zeolite ◽  
Zeolite Catalysts ◽  
Active Natural

scholarly journals Depolymerization of Poly (L-lactic acid) under Hydrothermal Conditions

2004 ◽  
Vol 61 (11) ◽  
pp. 561-566 ◽  
Author(s):  
Takashi SAEKI ◽  
Takayuki TSUKEGI ◽  
Hideto TSUJI ◽  
Hiroyuki DAIMON ◽  
Koichi FUJIE
Keyword(s):  
Lactic Acid ◽  
Hydrothermal Conditions
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