This work describes the 1,4-butynediol (BYD) hydrogenation to 1,4-butanediol (BDO) performance over supported Ni/Al2O3-SiO2 catalysts with different mesoporous structures (cross pore C-Ni/Al-SiO2, parallel pore P-Ni/Al-SiO2, and nonmesoporous structured N-Ni/Al-SiO2). To illustrate the pore structure effects on the catalyst texture, metal–support interaction, and surface acidity, the obtained catalysts were characterized using BET, inductively coupled plasma (ICP), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), H2 temperature-programed reduction (H2-TPR), and H2/NH3-temperature-programmed desorption (H2/NH3-TPD). Based on this, we proposed the structure–activity relationship between the pore structures and the hydrogenation performance. It was found that C-Ni/Al-SiO2 had short-range staggered and cross mesopores throughout the support, which can provide a larger surface area and pore volume for the fixation of highly dispersed active sites, thus enhancing the H2 activation ability. On the other hand, the cross channels have rich hole loops and surface defects for exposing assistant acid sites that are beneficial for the 1,4-butynediol (BYD) adsorption/activation, thus promising a superior hydrogenation ability. However, the narrow and long parallel pore structure of P-Ni/Al-SiO2 may limit the rapid diffusion of long-carbon-chain BYD in the pores, thus partially decreasing the accessibility of active sites and the catalytic activity. As for N-Ni/Al-SiO2, which has no mesoporous structure, its nickel particles are prone to aggregate seriously on the support surface, which weakens the interaction with the support and is not conducive to catalytic hydrogenation.

Abstract. The addition of nano-SiO 2 to 20% silane coupling agent is carried out using anhydrous ethanol as the solvent in the presence of acetic acid. The styrene-butadiene-styrene (SBS) is added with 1% dicumyl peroxide crosslinking agent by adding 5% maleic anhydride grafted polyethylene to be modified on an extruder. Polystyrene/nano-SiO 2 composites are prepared by blending nano-SiO 2 and SBS in different proportions with waste polystyrene. Three mechanical properties of the newly prepared materials are tested, including the tensile strength, impact strength, and flexural strength. The results show that the composite properties of polystyrene/nano-SiO 2 composites containing 8% nano-SiO 2 are the best. The microstructures and physicochemical structures of the composites were further studied by means of infrared spectroscopy (FT-IR), X ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric-differential thermal analysis (TG-DTA). The results reveal that the tensile, impact and bending properties of 8% nano-SiO 2 composites are improved best, and at the same time, the proportion of the prepared composite structure is stable. The preparation method of the composite material is simple and easy to operate, and has certain industrial application prospect.