Synergetic effect between the metal and acid sites of Pd/SAPO-41 bifunctional catalysts in n-hexadecane hydroisomerization
| العنوان: | Synergetic effect between the metal and acid sites of Pd/SAPO-41 bifunctional catalysts in n-hexadecane hydroisomerization |
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| المؤلفون: | Oleg Kikhtyanin, Xuefeng Bai, Wei Wu, Xiaomeng Wei, V. N. Parmon, Xiaofang Su, Linfei Xiao, Yang Zhang, Jianwei Zhang |
| المصدر: | Journal of Porous Materials. 25:235-247 |
| بيانات النشر: | Springer Science and Business Media LLC, 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | 010405 organic chemistry, Mechanical Engineering, Inorganic chemistry, Infrared spectroscopy, 010402 general chemistry, Molecular sieve, 01 natural sciences, 0104 chemical sciences, Catalysis, Bifunctional catalyst, Metal, chemistry.chemical_compound, Crystallography, chemistry, Mechanics of Materials, visual_art, Pyridine, visual_art.visual_art_medium, General Materials Science, Bifunctional, Brønsted–Lowry acid–base theory |
| الوصف: | Silicoaluminophosphate molecular sieves (SAPO-41) with different SiO2/Al2O3 ratios were synthesized using di-n-butylamine (DBA) as template. All of the samples were characterized by XRD, SEM, TEM, N2 adsorption, 29Si MAS NMR and IR spectroscopy of adsorbed pyridine. Based on the SAPO-41 molecular sieve, a series of nPd/S41(x) bifunctional catalysts with different SiO2/Al2O3 molar ratios (x = 0.2–0.7) and Pd loadings (n = 0.1–1.0 wt%) were prepared. Their catalytic performance was investigated in n-hexadecane hydroisomerization using a fixed-bed flow reactor system. The influence of the acidity and ratio between the accessible Pd sites and Bronsted acid sites $$\left( {{{{{C}_{{Pd}}}} \mathord{\left/ {\vphantom {{{{C}_{{Pd}}}} {{{C}_{{{H}^{+}}}}}}} \right. \kern-\nulldelimiterspace} {{{C}_{{{H}^{+}}}}}}} \right)$$ on the catalytic performance of the prepared samples was studied by adjusting the composition of the initial gel in the synthesis of SAPO-41 molecular sieves and the Pd loadings during preparation process. The results indicated that the 0.8Pd/S41(0.6) catalyst exhibited excellent catalytic performance due to a suitable acidity, high Pd dispersion and appropriate $${{{{C}_{{Pd}}}} \mathord{\left/ {\vphantom {{{{C}_{{Pd}}}} {{{C}_{{{H}^{+}}}}}}} \right. \kern-\nulldelimiterspace} {{{C}_{{{H}^{+}}}}}}$$ ratio (0.58), which was beneficial for the synergetic effect between the (de)hydrogenating and acid functions of the bifunctional catalyst. The highest iso-hexadecane yield of 89% was obtained at an n-hexadecane conversion of 94% over the 0.8Pd/S41(0.6) catalyst. |
| تدمد: | 1573-4854 1380-2224 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::d789be72f8edc8a3ea2e32593ea65116Test https://doi.org/10.1007/s10934-017-0437-7Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........d789be72f8edc8a3ea2e32593ea65116 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15734854 13802224 |
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