Liao Yang

Preparation of Pt/ γ -Al 2 O 3 -C Heterogeneous Catalyst for Highly Selective Hydrogenation of Cinnamaldehyde Towards Cinnamyl Alcohol

A Pt/γ-Al2O3-C heterogeneous catalyst with improved catalytic performance was successfully prepared. Bayberry tannin(BT), an abundant natural plant polyphenol, was utilized to modifiy the surface of the γ-Al2O3 matrix and then stabilize Pt nanoparticles(NPs). The catalyst was systematically and specifically characterized by a collection of analytic tools including XRD, XPS, FTIR, TEM, and TG. It was found that the Pt NPs were envenly dispered on the γ-Al2O3-C matrix. Meanwhile, when the catalyst was applied for selective hydrogenation of cinnamalde-hyde(CMA) in the presence of KOH promoter in solvent, excellent catalytic performance was obtained. The selectivity to cinnamyl alcohol(CMO) reached 97.88% with 88.45% CMA conversion within 30 min in the presence of 0.037 mol/L KOH, without significant loss of catalytic activity even under cyclic measurements for 5 times. The excellent catalytic performances should be ascribed predominantly to the uniform and stable dispersion of Pt NPs on the γ-Al2O3-C matrix and the excellent heat stability of BT.

In situ Growing PtCo Bimetallic Catalyst on Plant Tannin-grafted Collagen Fiber for Catalytic Hydrogenation of Cinnamaldehyde with Desirable Performance

PtCox bimetallic nanoparticles(NPs) supported on tannin-grafted collagen fiber(CF-BT) have been pre-pared via a novel synthetic strategy, and applied for catalytic hydrogenation of cinnamaldehyde(CAL), a typic unsa-turated aldehyde. The catalysts were systematically and specifically characterized by means of XRD, XPS, TEM-EDX and SEM to clarify the structure-property correlation. It was found that the PtCox/CF-BT catalysts exhi-bited significantly enhanced catalytic activity and desirable stability in catalytic hydrogenation of CAL, which is ascribed to the synergistic interaction between bimetallic components, the effective dispersion, the anchoring role of CF-BT matrix on bimetallic NPs, as well as the lower mass transfer resistance of the matrix.

A Novel Fibrous Zirconium Sulfate Solid Acid Catalyst for Esterification Reaction

The new type of catalytic zirconium sulfate solid acid material was prepared by using collagen fiber as matrices. The catalyst structure remains fibrous confirmed by SEM. Activities of catalyst etherification of acetic acid with n-butanol were evaluated. Optimal esterification conditions are found out. The catalyst was high in catalytic activity for the synthesis of n-butyl acetate, it overcame the drawbacks of liquid acid and it had convenient separation with liquid phase after reaction without corroding equipment, it was easy in recycle, non - polluting. So the catalyst is a promising application.

The Influence of Ce on Spirodela polyrrhiza

In recent years, Rare Earth (RE) has been mined, smelted and applied largely. Because the Rare Earth element(REE) migrate from lithosphere to hydrosphere and biosphere, it may has a negative influence analogous heavy metal on aquatic environment. In this paper, the cerium ion¡¯sinfluence on Spirodela Polyrrhiza was researched from concentration and valence state aspects quantificationally. The results showed that the different valence states of Ce had little impact on Spirodela Polyrrhiza. Under the condition of low Ce concentration (0.00-1.00mg/L), the growth of Spirodela Polyrrhiza was promoted, and the high cerium concentration( £¾ 1.00mg/L) can restrain the growth of Spirodela Polyrrhiza, the optimum accelerate concentration of Ce was near 0.65mg/L.