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Porous Hafnium Phosphonate: Novel Heterogeneous Catalyst for Conversion of Levulinic Acid and Esters into γ‑Valerolactone
journal contribution
posted on 2016-10-14, 00:00 authored by Chao Xie, Jinliang Song, Baowen Zhou, Jiayin Hu, Zhanrong Zhang, Pei Zhang, Zhiwei Jiang, Buxing HanCatalytic transfer
hydrogenation (CTH) of levulinic acid (LA) and
its esters to produce γ-valerolactone (GVL) is an important
route for biomass transformation. Development of efficient and heterogeneous
catalysts for the GVL production via CTH reaction of LA and its esters
has attracted much attention. In this work, a new hafnium (Hf) containing
organic–inorganic hybrid catalyst (Hf-ATMP) was prepared by
the reaction of HfCl4 and amino tri(methylene phosphonic
acid) and was used to catalyze the CTH reaction of LA and its esters
to produce GVL using isopropanol as the hydrogen source. It was found
that the prepared Hf-ATMP could catalyze the CTH reaction to provide
satisfactory GVL yield, and the effects of reaction temperature, reaction
time, and the amount of the catalyst on the reaction were studied
in detail. Meanwhile, the Hf-ATMP could be reused at least five times
without notable decrease in activity and selectivity. Systematic studies
indicated that the acidity of Hf, the basicity of the phosphate groups,
and the porosity of the prepared catalyst were the main reasons for
the catalytic performance of Hf-ATMP in the CTH reaction of LA and
its esters.