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Selective Hydrogenation of the C8 Aromatic Fraction of Pyrolysis Gasoline over NiZn3/α-Al2O3: Experimental and Modeling Studies
journal contribution
posted on 2020-02-25, 22:13 authored by Zhichang Bao, Lei Yang, Zhenmin Cheng, Zhiming ZhouA non-noble NiZn3/α-Al2O3 catalyst was prepared by a urea co-precipitation
method, which showed
good stability and high selectivity to styrene (ST) (92% selectivity
at above 99% conversion of phenylacetylene (PA)). The high selectivity
was mainly attributed to the electronic effect of the Ni–Zn
alloy. The selective hydrogenation of the C8 aromatic fraction
on NiZn3/α-Al2O3 was well described
by a Langmuir–Hinshelwood-type kinetic model. The estimated
activation energies for the hydrogenation reactions of PA →
ST, ST → ethylbenzene (EB), and PA → EB were 70.31,
81.65, and 74.88 kJ/mol, respectively. A reactor model allowing for
an intraparticle diffusion-reaction and external mass transfer was
further developed to describe the selective hydrogenation of the C8 aromatic fraction on larger NiZn3/α-Al2O3 particles in a fixed-bed reactor. The observed
changes in product composition with the reaction conditions were well
predicted by the model, and the results demonstrated that phenylacetylene
can be completely removed without loss of styrene under certain conditions.