Selection of the optimal composition of alumina support for pyrolysis gasoline hydrogenation Pd-Al2O3-catalyst

To optimize the chemical composition of catalysts for pyrolysis gasoline dienes and vinyl aromatic hydrocarbons selective hydrogenation there is investigation of influence of acid-base and textural characteristics of support, modified by sodium compounds additives, on activity and stability of catalysts in hydrogenation, oligomerization of unsaturated compounds. It is shown that the rate of oligomeric compounds formation depends on Lewis (QСО > 34 kJ/mol) and Bransted (νон = 3688 см–1) points number. With the growth of their total content on the surface of catalysts, the rate of oligomeric hydrocarbon formation increases. Number of surface condensation products is determined by the concentration of strong aprotic centers QСО > 35 kJ/mol. Alumina support samples with high surface concentration of medium Lewis centers, wedge-shaped or conical pores and preferential distribution of porometric volume in pores of 5–15 nm diameter are characterized by large oligomers forming ability for unsaturated compounds. The catalysts containing 0,5 wt.% Na have less oligomers forming ability and high stabile activity in the hydrogenation of diene and vinyl aromatic hydrocarbons of pyrolysis gasoline. For pyrolysis gasoline dienes and vinyl aromatic hydrocarbons selective hydrogenation they recommend the catalyst with 0,5 wt.% Pd, deposited from palladium acetylacetonate on δ-Al2O3 modified by 0,5 wt.% Sodium, which is characterized by absence of long wedge-shaped or conical shape pores and predominantly (60,7 %) distribution of porometric volume in pores dп > 15 nm, low aprotic acidity (L = 3,1 mmol/g), what reduces the amount of formed seal products (V = 3,6 mg/(gkat·h)) and high stabile activity (DF = 0,68 g J2/100 g) in the hydrogenation of unsaturated compounds.

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