Error in Figure
In the original publication [1], there was a mistake in “Scheme 1. Reaction mechanisms of LVA hydrodeoxygenation to GVL” as published. There is a technical mistake in the formula of γ-valerolactone.
Please see the corrected version below of Scheme 1.
Scheme 1.
Reaction mechanisms of LVA hydrodeoxygenation to GVL.
Text Correction
There was an error included in the original publication. There was a mistake in the stated solvent.
A correction has been made to 3. Experimental Part, 3.3. Impregnation of Coal Fly Ash Zeolite with Ni, Co and Cu, paragraphs 2, 3 and 4.
The monometallic fly ash zeolites were prepared by the following procedures: 10 wt.% Ni: 550 mg Ni(NO3)2·6H2O was dissolved in 1 mL distilled water and was added to 1 g zeolite support by stirring until evaporation of the solvent. Then, the sample was dried at 80 °C for 18 h and calcined at 450 °C for 3 h with a rate of 1 °C/min. The sample was denoted as 10Ni/Z; 10 wt.% Co: 548.2 mg Co(NO3)2·6H2O was dissolved in 1 mL distilled water and was added to 1 g AES0 support by stirring until evaporation of the solvent. Then, the sample was dried at 80 °C for 18 h and calcined at 450 °C for 3 h with a rate of 1 °C/min. The sample was denoted as 10Co/Z; 10 wt.% Cu: 516.4 mg Cu(NO3)2·6H2O was dissolved in 1 mL distilled water and was added to 1 g zeolite support by stirring until evaporation of the solvent. Then, the sample was dried at 80 °C for 18 h and calcined at 450 °C for 3 h with a rate of 1 °C/min. The sample was denoted as 10Cu/Z.
Bimetallic, 5 or 10 wt.% Ni- and Co-modified fly ash zeolite was prepared by the following procedures: 275/550 mg Ni(NO3)2·6H2O and 274.1/548.2 mg Co(NO3)2·6H2O dissolved in 1 mL distilled water was added to 1 g fly ash zeolite sample and then was dried at 80 °C for 18 h. The precursor salts were decomposed in air at 450 °C with a rate of 1 °C/min for 3 h. The samples were denoted as 5Ni5Co/Z and 10Ni10Co/Z, respectively.
Bimetallic, 5 or 10 wt.% Ni- and Cu-modified fly ash zeolite was prepared by the following procedures: 275/550 mg Ni(NO3)2·6H2O and 258.2/516 mg Cu(NO3)2·6H2O dissolved in 1 mL distilled water was added to 1 g zeolite and then was dried at 80 °C for 18 h. The precursor salts were decomposed in air at 450 °C with a rate of 1 °C/min for 3 h. The samples were denoted as 5Ni5Cu/Z and 10Ni10Cu/Z, respectively.
The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.
Reference
- Popova, M.; Dimitrov, M.; Boycheva, S.; Dimitrov, I.; Ublekov, F.; Koseva, N.; Atanasova, G.; Karashanova, D.; Szegedi, Á. Ni-Cu and Ni-Co-Modified Fly Ash Zeolite Catalysts for Hydrodeoxygenation of Levulinic Acid to γ-Valerolactone. Molecules 2024, 29, 99. [Google Scholar] [CrossRef] [Scilit]
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