Synthesis of tert -amyl methyl ether (TAME) over modified activated carbon catalysts

Rechnia, Paulina; Malaika, Anna; Kozłowski, Mieczysław

doi:10.1016/j.fuel.2015.03.086

Cited by 31 publications

(20 citation statements)

References 45 publications

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“…However, as suggested in the literature, hot concentrated H2SO4 is a strong oxidizing agent; upon contact with carbonaceous materials, it can also generate carboxylic groups [29]. This phenomenon was observed by Rechnia et al [30] in the case of H2SO4-modified activated carbons. On the other hand, the reaction of TRGO with H3PO4 did not increase the oxygen content.…”

Section: Elemental and Textural Analysismentioning

confidence: 66%

Modified graphene-based materials as effective catalysts for transesterification of rapeseed oil to biodiesel fuel

Gaidukevič

Barkauskas

Malaika

et al. 2018

Chinese Journal of Catalysis

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Section: Elemental and Textural Analysismentioning

confidence: 66%

Modified graphene-based materials as effective catalysts for transesterification of rapeseed oil to biodiesel fuel

Gaidukevič

Barkauskas

Malaika

et al. 2018

Chinese Journal of Catalysis

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“…Most importantly, the selected functionalization methods led to successful incorporation of S to CNFs (the S content in the modified samples between 0.3 and 1.0%). However, the efficiency of these modifications was considerably lower than that observed for other carbon materials, such as carbon xerogels and spheres (for which the S contents were between 1.4 and 4.3%) 17 , ordered mesoporous carbons (S = 1.4% and 7.0%) 18 , or activated carbons (the S content of 1.5–2.8%) 41 . Significantly higher amounts of sulfur were introduced to the virgin CNFs during functionalization with diazonium salt (BDS-modified CNFs contained 2–3 times more S than H 2 SO 4 -modified carbons).…”

Section: Resultsmentioning

confidence: 78%

Production of valuable chemicals from glycerol using carbon fiber catalysts derived from ethylene

Malaika

Ptaszyńska

Kozłowski

2021

Sci Rep

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Ethylene was thermocatalytically transformed into carbon products via a CCVD process. The filamentous carbon obtained was further modified with concentrated sulfuric acid or 4‐benzenediazonium sulfonate (BDS) to produce acid-type catalysts. The as-prepared samples were characterized by SEM and TEM techniques to confirm their morphological features. TG, XRD, elemental, and porosity analyses were also performed to assess the quality of these materials. The fabricated carbons were tested in eco-friendly green synthesis of value-added fuel bio-additives, namely in glycerol esterification. The reaction of glycerol transformation was performed with acetic acid at 80 °C using different glycerol to acetic acid (Gly/AA) molar ratios. The samples functionalized with diazonium salt showed better performance in the above process than those modified with H2SO4, and this was found to be directly related to the degree of surface functionalization with acidic sites. BDS-modified carbon fibers allowed obtaining acceptable results within 6 h when the reaction was performed with a Gly/AA molar ratio of 1:6, however, the dominant products in this case were mono- and diacetins. Extended reaction time altered the distribution of products. Finally, the combined selectivity to the targeted acetins (i.e., DA and TA) was about 75.5%. A direct correlation between the content of –SO3H groups of CNFs and the yield of higher acetins was found.

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“…In addition, the two best performing carbocatalysts (i. e. CX_P and CX_gel_P) presented high surface acidity (see Table ), as a consequence of the surface enrichment with the oxygen and phosphorus groups during their functionalisation. Importantly, these catalysts displayed Brønsted acidity originated from P−OH groups as well as from the presence of carboxylic groups and some weak acids like phenolic groups, which were shown to be active in hydrolysis reactions ,. Moreover, as was shown by the comparison of XPS, IR and ICP results, most of the phosphoric functionalities together with the oxygen groups were easily accessible for the bulky substrate (i. e. cellobiose) and in close vicinity to glycosidic bond to activate it for hydrolysis, leading to the outstanding catalytic results.…”

Section: Resultsmentioning

confidence: 97%

“…The total acidity of the samples was determined by a potentiometric back titration method as described in detail in using a Cerko Lab System microtitration unit equipped with a syringe pump, a pH combined electrode and a magnetic stirrer.…”

Section: Methodsmentioning

confidence: 99%

Cutting the Green Waste. Structure‐Performance Relationship in Functionalized Carbon Xerogels for Hydrolysis of Cellobiose

et al. 2018

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The hydrolysis of cellulose and hemicelluloses in the presence of solid acid catalysts is of great importance as an entry process for the production of biofuels and chemicals. In this work, the effect of carbon surface chemistry on the catalyst conversion and selectivity in hydrolysis of cellobiose to glucose was studied. Solid catalysts based on carbon xerogels (CXs) containing various functionalities incorporating heteroatoms (S, P, N, O), as confirmed by XPS, TPD, ICP and EA analyses, were successfully prepared. CXs containing 3.4 wt % of phosphorus showed the best catalytic performance, reaching 90 % con-version of cellobiose with 72 % selectivity to glucose, under oxidative atmosphere and in a short reaction time of only 4 h. The presence of phosphonates (ÀPÀCÀ) was found to increase the selectivity to glucose up to unprecedented 87 %. On the contrary, carbonyls, quinones, pyrydinic, pyrrolic and sulfonic groups were found to promote glucose degradation, leading to a final low yield of this product. Additionally, the increased concentration of oxygen in the reaction atmosphere was shown to significantly weaken the b (1-4)-glycosidic bond, increasing the final yield of glucose.[a] Dr.

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Synthesis of tert -amyl methyl ether (TAME) over modified activated carbon catalysts

Cited by 31 publications

References 45 publications

Modified graphene-based materials as effective catalysts for transesterification of rapeseed oil to biodiesel fuel

Modified graphene-based materials as effective catalysts for transesterification of rapeseed oil to biodiesel fuel

Production of valuable chemicals from glycerol using carbon fiber catalysts derived from ethylene

Cutting the Green Waste. Structure‐Performance Relationship in Functionalized Carbon Xerogels for Hydrolysis of Cellobiose

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