Hydrocracking of DDGS corn oil over transition metal carbides supported on Al-SBA-15: Effect of fractional sum of metal electronegativities

Alwan, Basem Al; Salley, Steven O.; Ng, Koon‐Kwan

doi:10.1016/j.apcata.2014.07.018

Cited by 16 publications

(7 citation statements)

References 28 publications

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“…The SBA-15 molecular sieve has been widely studied in different catalytic fields because of the good hydrothermal stability, high surface area, and variable pore size as well as its highly ordered mesoporous system. − In addition, the acidic properties of Al-SBA-15 can be adjusted over a relatively wide range because the aluminum can replace Si atoms in the framework to form Brönsted acid and nonskeleton structure for Lewis acid . In this paper, mesoporous Al-SBA-15 molecular sieves with different Si/Al ratios were prepared to study the catalytic performance of PODEn to verify the influences of acid strength, acid amount, and acid type on the yield, selectivity, product distribution, and chain length.…”

Section: Introductionmentioning

confidence: 99%

Efficient Synthesis of Polyoxymethylene Dimethyl Ethers on Al-SBA-15 Catalysts with Different Si/Al Ratios and Pore Sizes

et al. 2016

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As a kind of excellent diesel-blending component, polyoxymethylene dimethyl ethers (PODEn) have received widespread attention. Herein, Al-SBA-15 molecular sieves with different Si/Al ratios and pore sizes were synthesized and used to investigate the catalytic performance for the synthesis of polyoxymethylene dimethyl ethers from methylal and trioxane. X-ray diffraction, N 2 adsorption−desorption, scanning electron microscopy, transmission electron microscopy, X-ray fluorescence, and 27 Al NMR were used to characterize the structures of obtained catalysts. Ammonia temperature-programmed desorption and pyridine adsorption were carried out to investigate the acid properties of the catalysts. Through comparison of the catalysts with different Al contents, it was found that the relatively weak acid was more suitable for the synthesis of PODEn than the relatively strong acid in the catalytic system of Al-SBA-15. On the Al-SBA-15(2)-150 catalyst, which has only a weak acid of 0.163 mmol/g, the highest TOX conversion rate and highest PODEn yield and selectivity were achieved, showing the best catalytic performance. It appears that the PODEn synthesis can be catalyzed by not only a Bronsted acid but also a Lewis acid. The catalysts with strong acid and/or with a large number of acids will cause the generation of significant amount of methyl formate byproduct. Through comparison of the catalysts with different pore sizes, it was found that a relative larger pore size of the catalyst was beneficial for the PODEn synthesis to a certain extent under the catalysts with strong acid and/or large acid amount, but on the catalyst that had only weak acid and a relatively lesser amount, the change of pore size had almost no effect on the yield and selectivity of PODEn products.

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Section: Introductionmentioning

confidence: 99%

Efficient Synthesis of Polyoxymethylene Dimethyl Ethers on Al-SBA-15 Catalysts with Different Si/Al Ratios and Pore Sizes

et al. 2016

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“…Biofuels such as green diesel produced by hydroprocessing of plant oils typically display similar properties to petroleum diesel. They can be directly used in existing infrastructures with no modifications 2 . Various porous sulfided catalysts have been used to produce biofuels from plant oils 3 .…”

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confidence: 99%

NiO-PTA supported on ZIF-8 as a highly effective catalyst for hydrocracking of Jatropha oil

Liu

Wang

et al. 2016

Sci Rep

122

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Nickel oxide (NiO) and phosphotungstic acid (PTA) supported on a ZIF-8 (NiO-PTA/ZIF-8) catalyst was first synthesized and it showed high activity and good selectivity for the hydrocracking of Jatropha oil. The catalyst was characterized by SEM, SEM-EDS, TEM, N2 adsorption, FT-IR, XRD and XPS. Compared with the NiO-PTA/Al2O3 catalyst, the selectivity of C15-C18 hydrocarbon increased over 36%, and catalytic efficiency increased 10 times over the NiO-PTA/ZIF-8 catalyst. The prepared NiO-PTA/ZIF-8 catalyst was stable for a reaction time of 104 h and the kinetic behavior was also analyzed. This catalyst was found to bypass the presulfurization process, showing promise as an alternative to sulfided catalysts for green diesel production.

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“…27,28 The study of catalysts for hydrocarbon cracking shows that metals with similar electronegativities would therefore lead to similar catalytic effects. 28,29 Therefore, it could be that the d-band center is influenced by the deeper ionization potentials of the B metals (which factors into l B ) takes over as a more important parameter than B-O bond strength.…”

mentioning

confidence: 99%

Influence of transition metal electronegativity on the oxygen storage capacity of perovskite oxides

et al. 2016

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The selection of highly efficient oxygen carriers (OCs) is a key step necessary for the practical development of chemical looping combustion (CLC). In this study, a series of ABO3 perovskites, where A = La, Ba, Sr, Ca and B = Cr, Mn, Fe, Co, Ni, Cu, are synthesized and tested in a fixed bed reactor for reactivity and stability as OCs with CH4 as the fuel. We find that the electronegativity of the transition metal on the B-site (λB), is a convenient descriptor for oxygen storage capacity (OSC) of our perovskite samples. By plotting OSC for total methane oxidation against λB, we observe an inverted volcano plot relationship. These results could provide useful guidelines for perovskite OC design and their other energy related applications.

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Hydrocracking of DDGS corn oil over transition metal carbides supported on Al-SBA-15: Effect of fractional sum of metal electronegativities

Cited by 16 publications

References 28 publications

Efficient Synthesis of Polyoxymethylene Dimethyl Ethers on Al-SBA-15 Catalysts with Different Si/Al Ratios and Pore Sizes

Efficient Synthesis of Polyoxymethylene Dimethyl Ethers on Al-SBA-15 Catalysts with Different Si/Al Ratios and Pore Sizes

NiO-PTA supported on ZIF-8 as a highly effective catalyst for hydrocracking of Jatropha oil

Influence of transition metal electronegativity on the oxygen storage capacity of perovskite oxides

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