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.

An Equivalent Circuit Model for Lithium Battery of Electric Vehicle considering Self-Healing Characteristic

Abstract: Considering the self-healing phenomenon of lithium batteries during intermittent discharge, a self-healing characteristic-based equivalent circuit model of lithium batteries is proposed. The mathematical description of the lithium battery in the self-healing process is obtained through the analysis of the equivalent circuit model. Based on experimental platform, an experiment considering self-healing characteristic was performed. Result shows that the self-healing characteristic-based lithium battery equivalent circuit model can describe the voltage of the lithium battery accurately during the self-healing process.

Complete Measurement of the Λ Electromagnetic Form Factors

Abstract: The exclusive process e(+)e(-) -> Lambda(Lambda) over bar, with Lambda -> p pi(-) and (Lambda) over bar -> (p) over bar pi(+), has been studied at root s = 2.396 GeV for measurement of the ...

Oxidative dehydrogenation of propane over Mg-V-O oxides supported on MgO-coated silica: Structural evolution and catalytic consequence

Abstract: Supported Mg-V-O oxides were prepared by co-impregnation of magnesium and vanadium citrates with MgO-coated mesoporous silica (SBA-15). Their structures were characterized by complementary techniques including powder X-ray diffraction, Raman spectroscopy, diffuse reflectance UV–vis spectroscopy and transmission electron microscopy. These catalysts were examined in oxidative dehydrogenation (ODH) of propane to propylene, and the reaction kinetic parameters of k1/k2 and k3/k1 were analyzed, which represent the ratios of the rate constants for primary propane ODH (k1) to propane combustion (k2) and that for secondary propylene combustion (k3) to k1, respectively. Characterization results show the structural evolution of the vanadium species from isolated VO4 monovanadates to Mg3V2O8 crystallites, without formation of crystalline V2O5, with increasing the vanadium content from 1.7 wt% to 25.6 wt%. Dispersed monovanadates exhibited higher propane ODH rates than Mg3V2O8 crystallites, in line with their higher reducibility probed by temperature-programed reduction in H2, but they were less selective to propylene due to the favorable propylene combustion over its formation, as reflected by the higher k3/k1 ratios. The supported Mg3V2O8 crystallites with sizes of about 15–30 nm, relative to those of above 30 nm, were found to be intrinsically more selective for the propane ODH, consistent with their higher k1/k2 and lower k3/k1 ratios. Consequently, they offered the superior selectivities and yields of propylene at higher propane conversions. Such understanding on the intrinsic catalytic properties of the Mg-V-O oxides and particularly Mg3V2O8 crystallites provides new insights into the structural requirement for the propane ODH reaction, beneficial to design of more efficient Mg-V-O-based catalysts for the production of propylene.

Synthesis and characterization of ZnO decorated reduced graphene oxide (ZnO-rGO) and evaluation of its photocatalytic activity toward photodegradation of methylene blue

Abstract: Photocatalytic treatment is one of the techniques used for the treatment of dyes-contaminated wastewater. It is important to develop an effective visible-light-driven catalyst for the treatment of dyes-contaminated wastewater. This study reports the synthesis of ZnO-reduced graphene oxide catalyst for the degradation of methylene blue. Graphene oxide was prepared by Hammer and Offeman process, while ZnO-rGO (1:1) was prepared by the chemical reduction method. The prepared ZnO-rGO composite was characterized by XRD, TEM, SEM, UV-Vis, DRS, N2 adsorption-desorption, FTIR, and XPS analyses. The photocatalytic activity was evaluated by photodegradation of methylene blue solution under irradiation. It was found that ZnO-rGO is capable of removing the dye from water and achieved the highest dye degradation efficiency of ~99% within 60 min. Furthermore, the ZnO-rGO was recycled in degradation experiments without any loss in its catalytic performance. The reaction kinetics was described in terms of the Langmuir-Hinshelwood mechanism, one of the kinetics mechanisms of surface catalyzed reaction. 36.2 and 13.1 kJ/mol were calculated as the apparent and true activation energy for photodegradation of methylene blue respectively.