Improvement Effect of Ni to Pd-Ni/SBA-15 Catalyst for Selective Hydrogenation of Cinnamaldehyde to Hydrocinnamaldehyde

Abstract

Abstract:A series of Pd-Ni bimetallic catalysts supported on SBA-15 (0.2%Pd-x%Ni/SBA-15, x = 0.4, 0.7, and 1.2) were prepared through the impregnation method combined with the NaBH 4 reduction method. X-ray diffraction (XRD), N 2 adsorption-desorption, X-ray photoemission spectroscopy (XPS) and transmission electron microscope (TEM) were used to characterize the prepared catalysts. All the synthesized catalysts were evaluated for the liquid-phase hydrogenation of cinnamaldehyde (CAL). The addition of Ni obviously enhanced the CAL conversion and selectivity of C=C hydrogenation to hydrocinnamaldehyde (HALD) over the 0.2%Pd-x%Ni/SBA-15 catalysts. Meanwhile, 0.2%Pd-1.2%Ni/SBA-15 showed the best performance with 96.3% conversion and 87.8% selectivity toward HALD. This improvement was attributed to the synergistic effect between the Pd and Ni nanoparticles, enhancing the dispersion of Pd metal particles and increasing the content of surface Pd 0 species. In addition, the influences of a few reaction factors including H 2 pressure, reaction temperature, and reaction time were studied over 0.2%Pd-1.2%Ni/SBA-15.

Selective Hydrogenation of Cinnamaldehyde over the Stepped and Plane Surface of Pd Nanoparticles with Controlled Morphologies by CO Chemisorption

“…Compared to various Pd catalysts, the Pd/C catalysts reduced by CO molecules in this study showed the highest activity and comparable high selectivity (Table S6). ,− …”

“…The Pd catalyst has high activity and selectivity toward the hydrogenation of the CC bond of an α, β-unsaturated aldehyde such as CAL . To increase selectivity in the hydrogenation of the CC bond, control the Pd particle size, and tune the Pd electronic state by alloying with the second metal, , metal–support interactions have been conducted . In contrast, the morphology of Pd particles is also considered to be an important factor for CAL hydrogenation.…”

Recent Advances in Selective Hydrogenation of Cinnamaldehyde over Supported Metal-Based Catalysts

“…For example, a MCM-41 supported Pd−Ag alloy catalyst was applied for hydrogenation of CAL, and 98.6% of HCAL selectivity, with almost 100% CAL conversion, was achieved due to the ultrasmall Pd particle size and geometric and electronic effect between Pd and Au. 5 In addition to Ag, tungsten nitride (WN), 90 Ni, 91 and Sn 92 were also used as promoters for Pd catalysts. As shown in Table 3, entries 23− 25, 0.2%Pd-1.2%Ni/SBA-15 catalyst showed the highest selectivity to HCAL at a 12 bar H 2 pressure.…”

Pd Nanoparticles on SBA-15 Containing F for 2-Ethyl-Anthraquinone Hydrogenation: Effects of Hydrophobicity

“…No discernable diffraction peaks at 2θ = 40.08°, 46.62° assigned to (111), (200) reflections of Pd lattice [35] can be detected for all catalysts because of the high dispersion of Pd species [36] and low Pd loading (1 wt%). 2a, all catalysts exhibit typical type IV isotherms and H1 type hysteresis loops at the relative pressure P/P 0 between 0.7 and 0.85, indicating the presence of cylindrical channels with ordered pore structure [37,38]. Figure 2b demonstrates the narrow and uniform pore size distributions with the pore diameter of around 8 nm.…”