Influence of Ni/Al ratio on the fast pyrolysis of myristic acid when adsorbed on unsupported mixed oxides derived from layered double hydroxides

Arias, Santiago; González, Juan Felipe; Sousa, Lenivaldo V.; Barbosa, Celmy B.M.; Silva, Antônio Osimar Sousa da; Fréty, R.; Pacheco, José Geraldo A.

doi:10.1016/j.cattod.2020.07.028

Cited by 16 publications

(17 citation statements)

References 48 publications

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“…This value is higher than that of unidenti ed products estimated when cracking myristic acid and palmitic acid as model molecules [26,28]. This fact implies a more complex mechanistic scheme during cracking of unsaturated fatty molecules [25,29] when compared to the scheme retained during cracking of saturated fatty acids which is attributed essentially to decarboxylation and decarbonylation reactions, in agreement with the literature data [30][31][32][33]. In the present case, a complete deoxygenation of the oleic acid methyl ester (OAME) was not obtained.…”

Section: Resultssupporting

confidence: 86%

“…In the case of pure OAME, cracking produced mainly linear alkenes, the majority of them being 1-alkenes. These alkenes are an important class of products in the cracking of saturated fatty acids, as the main decomposition mechanism is due to simple decarbonylation [28,33]. The second class of important products has been observed to be polyunsaturated molecules, including dienes, trienes and alkynes.…”

Section: 2cracking Of Oleic Acid Methyl Ester Adsorbed On Zeolitesmentioning

confidence: 99%

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Deoxygenation of Oleic Acid Methyl Ester in FCC Process Conditions Over Protonated and Sodium Exchanged Y and ZSM-5 Zeolites

Padilha

Fréty

Santos

et al. 2021

Waste Biomass Valor

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One way to take advantage from out of speci cation biodiesel and waste from biodiesel tank bottom drainage is to co-process them in a uidized catalytic cracking (FCC) unit. The present work deals with the cracking of oleic acid methyl ester (OAME) as a biodiesel model, under conditions close to that of FCC process over ZSM-5 and Y zeolites, either in protonated or sodium forms, for the production of deoxygenated compounds. Catalytic fast cracking of OAME pre-adsorbed on the catalyst surface was performed, with a catalyst:OAME mass ratio of 10:1 in a micro-pyrolysis system at 650°C, coupled to a GC/MS for on line analysis of the products. Results show that the cracking of OAME without a catalyst favored the formation of linear alkenes and polyenes. Fast cracking of OAME over HZSM-5 and HY acidic zeolites led to the production of aromatics, due to hydrogen transfer. Cracking over NaY and HY zeolites produced remarkable amounts of rami ed saturated hydrocarbons. The formation of alkylated hydrocarbons was not signi cant over ZSM-5 zeolite probably due to a small pore size of this zeolite.NaY catalyst favored the production of hydrocarbons in the range of kerosene (C8-C12). Low acidic zeolites favored the production of non-aromatic hydrocarbons. Product distribution was affected by catalyst shape selectivity and acidity. These results show that residues from the biodiesel chain can be directly co-processed in FCC units to obtain high value hydrocarbons, mainly in the jet fuel and gasoline ranges. Statement Of NoveltyThis work shows that oleic acid methyl ester as a model of residues from off-spec biodiesel and waste from biodiesel tank bottom drainage can be directly co-processed in a FCC unit, using ZSM-5 and Y zeolites as catalysts in H-and Na-form. The use of such residues in FCC process can promote the production o high value hydrocarbons, mainly in the jet fuel and gasoline ranges. These results may be of great interest to the growing market for renewable jet fuel since the aviation industry is committed to reduce CO2 emissions towards zero net carbon emissions. To the best of our knowledge, such a systematic study has not been reported yet.

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Section: Resultssupporting

confidence: 86%

Section: 2cracking Of Oleic Acid Methyl Ester Adsorbed On Zeolitesmentioning

confidence: 99%

Deoxygenation of Oleic Acid Methyl Ester in FCC Process Conditions Over Protonated and Sodium Exchanged Y and ZSM-5 Zeolites

Padilha

Fréty

Santos

et al. 2021

Waste Biomass Valor

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“…The results obtained by XPS showed that in all cases, there was an enrichment of Al ion content on the surface of the MMO, as evidenced in the atomic percentage ratio of metal ions (Márquez et al, 2001). The enrichment of Al content on the material surface was illustrated in Table 2 by the relation Als/Alb for all samples, where Als indicates the Al content on the surface and Alb indicates the Al content in the bulk, respectively (Bîrjega et al, 2005;Shen et al, 2017;Arias et al, 2021).…”

Section: Resultsmentioning

confidence: 81%

Mixed oxides from calcined layered double hydroxides for glycerol carbonate production to contribute to the biodiesel economy

et al. 2022

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The glycerol generated as a by-product in the production of biodiesel could be used as a renewable raw material to economically promote the production process. The catalytic conversion of glycerol to a product with higher added value, such as glycerol carbonate, has attracted great interest in the chemical, pharmaceutical, and lithium battery industries, among others, due to its low toxicity, hydration capacity, and biodegradability. Layered-double hydroxide (LDH) materials, the precursors of the catalysts, were synthesized by a direct coprecipitation method to incorporate a third metal ion in addition to magnesium and aluminum ions. This method is the easiest regularly applied technique to design these low cost anionic nanoclay. The atomic percentage of Cu, Zn, or Ni incorporated was 15% of the Mg load in the material. The synthesis atomic ratio, (M2++Mg2+)/Al3+ had a constant value of 3, where M represents the transition metal incorporated. LDHs produced the corresponding mixed metal oxides by thermal decomposition. These materials have excellent properties for reactions catalyzed by the basic sites, high surface area, homogeneous cation dispersion, and thermal stability. The physicochemical material properties were characterized by XRD, N2 sorption, MP-AES, TPD-CO2, SEM, and XPS. The mixed oxides were evaluated in the catalytic conversion of glycerol to glycerol carbonate. The addition of Cu, Ni, or Zn to the matrix of Mg and Al produced changes in its physicochemical properties and mostly in the catalytic activity. X-ray diffractograms of LDHs showed the typical characteristic structure of layers even with metallic ions of Cu, Ni, or Zn incorporated, because their ionic radii are similar to that of the Mg ion, 0.69, 0.73, and 0.74 Å, respectively. The obtained mixed oxides showed a high catalytic activity towards the conversion of glycerol to glycerol carbonate under mild reaction conditions, a 1:2 ratio of glycerol:ethylene carbonate and solvent free. Relative yields higher than 80% were obtained, attributable to an adequate distribution of basicity and textural parameters. The catalysts were used in successive reaction cycles without significant loss of activity.

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“…The ZnAl-layered double hydroxide (ZnAl) heterogeneous catalyst (Zn/Al molar ratio = 4.0) was synthesized through coprecipitation at low supersaturation while maintaining a controlled pH of 7.5, as previously described. 32,33 Tetrahydrofuran (THF) (purity 99%) purchased by B'Herzog, (Germany) and chloroform (purity 99.8%) provided by Neon (Brazil) was used as received.…”

Section: Methodsmentioning

confidence: 99%

Structure and thermal behavior of biobased vitrimer of lactic acid and epoxidized canola oil

Rodrigues,

Arias,

Pacheco

et al. 2023

RSC Adv.

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Influence of Ni/Al ratio on the fast pyrolysis of myristic acid when adsorbed on unsupported mixed oxides derived from layered double hydroxides

Cited by 16 publications

References 48 publications

Deoxygenation of Oleic Acid Methyl Ester in FCC Process Conditions Over Protonated and Sodium Exchanged Y and ZSM-5 Zeolites

Deoxygenation of Oleic Acid Methyl Ester in FCC Process Conditions Over Protonated and Sodium Exchanged Y and ZSM-5 Zeolites

Mixed oxides from calcined layered double hydroxides for glycerol carbonate production to contribute to the biodiesel economy

Structure and thermal behavior of biobased vitrimer of lactic acid and epoxidized canola oil

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