Cyclohexane dicarboxylic acid (CHDA) ester, a kind of
environmental-friendly
plasticizer, can be produced by phthalates hydrogenation. However,
the synthesis of catalysts with high activity and selectivity is a
challenge due to the stability of aromatic rings. In this work, a
series of ultrauniform Ru nanoclusters supported by γ-Al2O3 are synthesized for the hydrogenation of diisononyl
phthalate (DINP). Results show that the conversion of DINP and the
selectivity of diisononyl-cyclohexane-1,2-dicarboxylate (DINCH) both
reach 100% at 140 °C and 3 MPa H2 pressure. Diisononyl-cyclohexene-1,2-dicarboxylate
(4H-DINP) and 1,2-cyclohexanedicarboxylate-7-methyloctyl ester are
found; the hydrogenation reaction network of DINP is constructed.
Alkali metal ions adsorbed on the surface of Ru nanoclusters prepared
by the polyol method can stabilize Ru3+-Hδ− species by electrostatic interaction, thus affecting the hydrogenation
activity of the catalyst, following the order of Li+ >
Na+ > K+ > Cs+. Ru-based catalysts
prepared by the polyol method have good prospects for application
in phthalates hydrogenation.
The enhanced mesoporosity in the networks is expected to offer a potential route to surmount mass-transport constraints within one-dimensional microporous structural zeolites. Highly crystalized ZSM-23 zeolite was synthesized and subsequently post-treated with alkali-etching and acid-etching, the effects of post-treatments on the physical and chemical properties of the parent zeolite were investigated via XRD, N 2 physical adsorption, FE-SEM, TEM, 27 Al MAS NMR, Py-IR and NH 3 -TPD. The catalytic activity of various Pt supported bifunctional catalysts was investigated via n-hexadecane hydroisomerization. The post-treated process not only increased the pore volume as well as the specific surface area, which efficiently improved the diffusion efficiency, but also changed the acidity and acid distribution of zeolite: alkali treatment could increase the content of total Brönsted acid while acid treatment exhibited an opposite trend. Acid treatment effectively promoted the density of weak Brönsted acid sites and suppressed the medstrong Brönsted acid sites. With the manipulation of acidity and development of mesoporosity in zeolite, the formation of isomers and the suppression of cracked products in the nhexadecane hydroisomerization were accomplished. The catalytic performance of catalysts showed that acid treatment could effectually promote the formation of isomeric products and inhibit cracking reactions. Especially, Pt/Z(1.0 HN) catalyst with suitable distribution of acid sites and textural properties, exhibited an outstanding n-C 16 hydroisomerization performance with the highest i-C 16 yield of 64 wt.% at 340 °C.
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