The selective hydrogenation of unsaturated aldehydes (UAL) to saturated aldehydes (SAL) and unsaturated alcohols (UOL) is an important industrial process for producing fine chemicals. More efforts ...

Highly Selective Catalysts for the Hydrogenation of Unsaturated Aldehydes: A Review

Copper-based catalysts with tunable acidic and basic sites for the selective conversion of levulinic acid/ester to γ-valerolactone or 1,4-pentanediol

Pt/CeO2 catalysts with different support shapes and prereduction temperatures were prepared and tested in the liquid-phase hydrogenation of nitrobenzene. Detailed characterizations reveal that the ...

Highly Efficient Hydrogenation of Nitrobenzene to Aniline over Pt/CeO2 Catalysts: The Shape Effect of the Support and Key Role of Additional Ce3+ Sites

Nanosized ZnIn2S4 supported on facet-engineered CeO2 nanorods for efficient gaseous elemental mercury immobilization.

Magnetically induced synthesis of mesoporous amorphous CoB nanochains for efficient selective hydrogenation of cinnamaldehyde to cinnamyl alcohol

BN-supported Pt catalysts were prepared by an impregnation method using Pt(NH3)4(NO3)2 as metal precursors and tested in the liquid-phase selective hydrogenation of cinnamaldehyde. It was found that the Pt/BN catalyst exhibited a high performance for the selective C O hydrogenation at room temperature. A selectivity of over 85% towards cinnamyl alcohol at a cinnamaldehyde conversion of over 95% could be obtained. The effects of supports and Pt particle sizes were explored by N2 physisorption, XRD, TEM, HRTEM, HAADF-STEM, TPD, H2-TPR, XPS, CO-DRIFTS, etc. The influences of solvents and operation conditions were investigated, and a simplified kinetics test was also carried out. The comparison of different supports suggested that BN with an inert surface and few acid-base sites possibly favors a simple adsorption mode of cinnamaldehyde dependent only on the supported Pt particles, resulting in a high selectivity to cinnamyl alcohol. While the abundant acid-base surface sites on the Pt/Al2O3 or Pt/SiO2, possibly associated with the multiple adsorption modes of cinnamaldehyde, had an adverse effect on the selective C O hydrogenation. The investigation of Pt size effect showed that large Pt particles with few low coordinated Pt sites displayed a higher selectivity to cinnamyl alcohol than small Pt particles with more low coordinated Pt sites on the Pt/BN catalysts. It was also revealed that water is a suitable solvent, and the presence of water in a mixture solvent is crucial for achieving a high activity of the Pt/BN in cinnamaldehyde hydrogenation.

Selective hydrogenation of cinnamaldehyde to cinnamyl alcohol over BN-supported Pt catalysts at room temperature

The invention discloses a multi-branched structural platinum-based bimetallic nanocatalyst, and a preparation method and an application thereof The catalyst is prepared by the steps of adding acetylacetone platinum and another metal acetylacetone compound into a long-chain olefin solution, carrying out ultrasonic treatment, introducing inert gas and stirring simultaneously to obtain a uniform mixed solution, heating the mixed solution to rise the temperature, keeping for a certain time, then separating, cleaning and carrying out vacuum drying to obtain the catalyst The catalyst has the multi-branched structure, and has the advantages of uniform size, good dispersity and controllable composition By use of olefins with different chain lengths and adjustment of the use amount of the long-chain olefins, the metal charge ratio, the temperature and the aging time, the reduction strength is controlled, and the multi-branched structural platinum-based bimetallic nanocatalyst with the specific structure can be controllably synthesized, and has the advantages of simple synthesis system and operation, low cost, environmental protection and easy production The catalyst exhibits higher catalytic activity in the selective hydrogenation reaction of nitrobenzene and has good application prospect

Qingsong Zhang

Papers

Highly Efficient Hydrogenation of Nitrobenzene to Aniline over Pt/CeO2 Catalysts: The Shape Effect of the Support and Key Role of Additional Ce3+ Sites

Selective hydrogenation of cinnamaldehyde to cinnamyl alcohol over BN-supported Pt catalysts at room temperature

Multi-branched structural platinum-based bimetallic nanocatalyst, and preparation method and application thereof