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.

Influence of MAO Treatment on the Galvanic Corrosion Between Aluminum Alloy and 316L Steel

Abstract: To slow down the galvanic corrosion of aluminum alloy and 316L stainless steel in subsea water, a micro-arc oxidation (MAO) coating was prepared on the surface of the Al alloy, and no treatment was performed on the surface of the 316L. The surface morphology of MAO-coated Al alloy was evaluated using a scanning electron microscope (SEM) before and after corrosion. A micro-hardness tester was used to measure the micro-hardness. Corrosion behaviors were evaluated by open-circuit potential (OCP), potentiodynamic polarization (PDP) and electrode impedance spectroscopy (EIS) tests in a 3.5 g/L NaCl solution. The results of PDP testing show that the corrosion potential of the MAO-coated galvanic pair was more positive than that of the uncoated galvanic pair and that the corrosion current density was smaller than that of the uncoated galvanic pair. EIS results show that the impedance of the galvanic pair increased after MAO coating. SEM images show that the corrosion damage of the uncoated Al alloy was more severe than that of the MAO-coated one, and the post-corrosion images of the surface of the 316L connected with MAO-coated Al alloy were more compact than those of the 316L connected with uncoated Al alloy. A physical model was developed to discuss the influence of MAO treatment on the galvanic corrosion process and corrosion mechanism.

A Newly Designed Core-Shell-Like Zeolite Capsule Catalyst for Synthesis of Light Olefins from Syngas via Fischer–Tropsch Synthesis Reaction

Abstract: Improving the selectivity of light olefins remains a longstanding challenge in Fischer–Tropsch to light olefins reaction (FTO). Toward this objective, we designed and prepared a newly catalyst with core-shell-like structure by using a simple and facile method named physically adhesive method. This core-shell-like catalyst Fe@SAPO-34 was characterized by XRD, SEM, EDS, N2 sorption and NH3-TPD respectively. The characterization results indicated that the SAPO-34 zeolite shell was comparatively uniform, homogeneous and defect-free, and it encapsulated the Fe catalyst entirely. Fischer–Tropsch synthesis reaction of syngas to light olefins was selected to test the catalytic performance of the zeolite capsule catalyst. In comparison with the simple mixture catalyst Fe/SAPO-34 and bare Fe catalyst, the newly Fe@SAPO-34 catalyst has demonstrated ability of the highest selectivity of light olefins 52.6% and O/P ratio 6.4. The SAPO-34 zeolite shell acted an important role for the improvement of light olefins selectivity.

Micro-electrolysis biological fluidized bed process for coking wastewater treatment

Abstract: In this study, the internal circulation iron–carbon micro-electrolysis (ICE) method was combined with activated sludge (AS) to form micro-electrolysis biological fluidized bed (MBFB) process for the treatment of coking wastewater with a low carbon-to-nitrogen (C/N) ratio. The MBFB process has chemical oxygen demand and total nitrogen removal rates of 92 and 95 %, respectively, which is much higher than those of the ICE process and single AS process. The results of three-dimensional fluorescence spectra showed that the MBFB process can not only remove protein-like substances, but can also degrade fulvic acid-like and humic acid-like substances. Fe2+/Fe3+ and active hydrogen atoms promoted the electron transfer inside and outside the microbial cells, thereby enhancing the metabolism of the microorganisms (such as Acidovorax), which is beneficial to the degradation of organics and nutriments. Therefore, the MBFB process has synergistic degradation properties and is promising for treating industrial wastewaters with low C/N ratios.

The Enhancement Effect of Mesoporous Graphene on Actuation of Nafion-Based IPMC

Abstract: A facile method to fabricate ionic polymer-metal composite (IPMC) actuators is proposed. A blend of mesoporous graphene (MG) and Nafion is used as the ionic matrix, which is sandwiched by two layers of blend of reduced graphene oxide (rGO) and Nafion as the electrodes. When subjected to an electrical field of 3 V, the IPMC actuator exhibits a blocking force of 10 gf g−1 for 20 s, and the same behavior can be repeatedly played for hundreds of cycles. MG improves the mechanical properties of Nafion-based IPMC, more importantly, the mesopores in graphene provide additional pathway for the diffusion of cationic clusters and thus enhance the actuation speed. In addition, the surface electrodes of rGO protect the interlamellar liquid from evaporation thus ensure the durability.