Beijing Institute of Petrochemical Technology

About: Beijing Institute of Petrochemical Technology is a education organization based out in Beijing, China. It is known for research contribution in the topics: Catalysis & Corrosion. The organization has 2468 authors who have published 1937 publications receiving 19270 citations.

Adsorptive removal of organics from aqueous phase by acid-activated coal fly ash: preparation, adsorption, and Fenton regenerative valorization of “spent” adsorbent

Abstract: Raw coal fly ash was activated to an adsorbent by sulfuric acid impregnation. The activation condition, the adsorption capacity, and the regenerative valorization of the adsorbent were studied. The results show that the optimal preparation conditions of the adsorbent are [H2SO4] = 1 mol L−1, activation time = 30 min, the ratio of coal fly ash to acid = 1:20 (g:mL), calcination temperature = 100 °C. The adsorption of p-nitrophenol on the adsorbent accords with the pseudo-second-order kinetic equation and the adsorption rate constant is 0.089 g mg−1 min−1. The adsorption on this adsorbent can be considered enough after 35 min, when the corresponding adsorption capacity is 1.07 mg g−1 (85.6% of p-nitrophenol removal). Compared with raw coal fly ash, the adsorbent has a stable adsorption performance at low pH range (pH = 1–6) and the adsorption of p-nitrophenol is an exothermic process. Ninety minutes is required for the regenerative valorization of saturated adsorbent by Fenton process. The regenerative valorization for this saturated adsorbent can reach 89% under the optimal proposed conditions (30 °C, pH = 3, [H2O2] = 5.0 mmol L−1, [Fe2+] = 5.5 mmol L−1). Within 15 experimental runs, the adsorbent has a better and better stability with the increase of experimental runs. Finally, the mechanism of activating coal fly ash is proposed, being verified by the results of the SEM and BET test.

ZrO2 coating of LiNi1/3Co1/3Mn1/3O2 cathode materials for Li-ion batteries

Abstract: ZrO2-coated LiNi1/3Co1/3Mn1/3O2 materials were prepared by hydroxide precipitation. The structure and electrochemical properties of the ZrO2-coated LiNi1/3Co1/3Mn1/3O2 were investigated using X-ray diffraction, scanning electron microscope, and charge–discharge tests, indicating that the lattice structure of LiNi1/3Co1/3Mn1/3O2 were unchanged after the coating but the cycling stability was improved. As the coating amount increased from 0.0 to 0.5 mol.%, the initial capacity of the coated LiNi1/3Co1/3Mn1/3O2 decreased slightly; however, the cycling stability increased remarkably over the cut-off voltages of 2.5~4.3 V and the capacity retention reached 99.5% after 30 cycles at the coating amount of 0.5 mol.%. ZrO2 coating also improved the cycling stability of LiNi1/3Co1/3Mn1/3O2 over wider cut-off voltage of 2.5~4.6 V.

Probing local corrosion performance of sol-gel/MAO composite coating on Mg alloy

Abstract: In this study, sol-gel technique was used to prepare Ca10(PO4)6(OH)2 (HA) coating on Micro arc oxidation (MAO) coated degradable Mg matrix composites to reduce their primary degradation and enhance biocompatibility in simulated body fluid (SBF). The microstructure and phase composition were analyzed using Scanning electron microscopy (SEM) and X-ray diffraction (XRD). Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) were used to examine their global corrosion behavior. Scanning vibrating electrode technique (SVET) and local electrochemical impedance spectroscopy (LEIS) were used to evaluate the potential distribution and impedance differences among the different zones. The global measurements show that the sol-gel/MAO coating has much better corrosion resistance than MAO coating, since the sol-gel coating sealed the pores produced in the MAO process. The post-corrosion microstructures of sol-gel/MAO composite coating on magnesium alloy are in agreement with the results of local corrosion performances. The corrosion mechanism is explained by proposing an empirical model.