Tuning the acidity by addition of transition metal to Mn modified hollow silica spheres and their catalytic activity in ethanol dehydration to ethylene

M Florea, A Bocirnea, S Neațu, AM Kuncser… - Applied Catalysis A …, 2022 - Elsevier
M Florea, A Bocirnea, S Neațu, AM Kuncser, MM Trandafir, F Neațu
Applied Catalysis A: General, 2022Elsevier
Due to the currently worldwide petrochemical feedstock shortage, the ethylene synthesis
from renewable non-oil sources becomes of high interest. The catalysts were prepared in
two steps:(i) formation of spheres containing the carbon-coated Mn core by hydrothermal
method,(ii) formation of the Si-Zr oxide shell by sol-gel method. The prepared catalysts were
characterized by N 2 physisorption, SEM-EDX, XRD, XPS, and NH 3-TPD. The catalytic
results have shown that Fe, Zn or Ni modified Mn core exhibited superior activity compared …
Abstract
Due to the currently worldwide petrochemical feedstock shortage, the ethylene synthesis from renewable non-oil sources becomes of high interest. The catalysts were prepared in two steps: (i) formation of spheres containing the carbon-coated Mn core by hydrothermal method, (ii) formation of the Si-Zr oxide shell by sol-gel method. The prepared catalysts were characterized by N2 physisorption, SEM-EDX, XRD, XPS, and NH3-TPD. The catalytic results have shown that Fe, Zn or Ni modified Mn core exhibited superior activity compared to the catalysts containing only Mn in the core. With 75% yield and 98% ethanol conversion at 350 °C and WHSV of 1.4 h–1, MnNi@SiZr was the best catalyst. These results are due to an increased number of acid sites compared to the other materials and an optimal ratio of weak/medium acid sites. Our findings suggest new lines for developing active and stable catalysts for ethylene synthesis from ethanol.
Elsevier
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