Taiyuan, China
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Meng F.,Taiyuan University of Technology | Li X.,Taiyuan University of Technology | Li M.,Taiyuan University of Technology | Cui X.,Taiyuan University of Technology | And 2 more authors.
Chemical Engineering Journal | Year: 2017

A series of La-promoted Ni/Al2O3 catalysts were prepared by the coimpregnation method, the effect of calcination conditions on catalyst structure and CO methanation in a slurry-bed reactor were investigated. N2 adsorption–desorption, XRD, H2-TPR, H2-chemisorption, XPS and TEM were used to characterize the catalysts. The results show that La promoter improved the Ni dispersion and enhanced the metal surface area of Ni/Al2O3 catalyst. With the increase in calcination temperature of La-promoted Ni/Al2O3 catalyst, the interactions between NiO species and support increased, whereas the Ni dispersion and metal surface area decreased, thus decreased the CO conversion. The catalyst calcined in air for 4 h or more exhibited a high catalytic stability, the calcination atmosphere (air and nitrogen) slightly affected the catalytic performance. The La-promoted Ni/Al2O3 catalyst calcined at 350 °C and 550 °C exhibited no deactivation after a reaction for 120 h, whereas the Ni/Al2O3 catalyst without La calcined at 350 °C deactivated fast. © 2016 Elsevier B.V.


Li Z.,Taiyuan University of Technology | Li Z.,Sedin Engineering Co. | Huang W.,Taiyuan University of Technology | Shi L.,Taiyuan University of Technology | Zhang G.,Taiyuan University of Technology
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2015

With aluminum isopropoxide as aluminum source, tetrabutyl titanate as titanium source, the NiMo slurry catalysts for ultra deep hydrodesulfurization of diesel were prepared by the complete liquid-phase technology. The prepared catalysts were characterized by XRD, TPD, N2 physisorption and XPS. The influences of the synthetic methods of precursor, including the sol-gel hydrolysis one step and sol-gel alcoholysis, hydrolysis two steps, respectively, with ethanol, isopropanol as solvent, on the catalytic 4, 6-DMDBT hydrodesulfurization performance of prepared NiMo catalysts were investigated. The catalytic performance of the NiMo catalyst prepared by sol-gel alcoholysis, hydrolysis two steps with ethanol as solvent, in which better dispersivity of metals, higher amount of acid and higher degree of vulcanization could be obtained, was more excellent in the removing of the sulfur from 4, 6-DMDBT than others. ©, 2015, Science Press. All right reserved.


Cui X.-X.,Taiyuan University of Technology | Fan H.,Sedin Engineering Company Ltd | Zheng H.-Y.,Taiyuan University of Technology | Li Z.,Taiyuan University of Technology
Chinese Journal of Inorganic Chemistry | Year: 2012

In the preparation of a CuO/ZnO/Al 2O 3 catalyst for slurry methanol synthesis, microwave irradiation was introduced into the aging process. The effect of solvent polarity was studied on phase composition of the precursor, microstructure of the calcined CuO/ZnO/Al 2O 3 catalyst and catalytic performance for slurry methanol synthesis. The characterization by XRD, FTIR, DTG, HR-TEM, H 2-TPR and XPS showed that the solvent polarity had a significant effect on the composition of the precursor aged under microwave irradiation. The results indicated that solvent polarity benefited to the substitution of Cu 2+/Zn 2+ in Cu 2(CO 3)(OH) 2/Zn 5(CO 3) 2(OH) 6 by Zn 2+/Cu 2+. With the increasing of the solvent polarity, the content and crystallization degree of (Cu, Zn) 2(CO 3)(OH) 2 and (Cu, Zn) 5(CO 3) 2(OH) 6 became higher in the precursor, the interaction of CuO/ZnO/Al 2O 3 between CuO and ZnO became stronger, CuO crystal particles dispersed better and surface CuO content became higher. The performance of CuO/ZnO/Al 2O 3 catalyst using water as solvent is the best, the methanol sapce-time yield (STY) and deactivation rate of the catalyst were 320 mg · g -1 · h -1 and 0.11%· d -1, respectively.


Yan S.-W.,Taiyuan University of Technology | Yan S.-W.,Sedin Engineering Company Ltd | Fan H.,Sedin Engineering Company Ltd | Liang C.,Taiyuan University of Technology | Li Z.,Taiyuan University of Technology
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2012

A series of amorphous Ni-Mo-B catalyst was prepared by KBH 4 reduction for liquid phase dinitrotoluene(DNT) hydrogenation. The results showed that Ni-B catalyst exhibited high activity and selectivity in liquid phase hydrogenation of DNT to diaminotoluene(TDA), the activity of Ni-B catalyst has been enhanced obviously by introduction of Mo, and the selectivity of TDA was 100% when the molar fraction of Mo was smaller and equal to 6%. The characterizations of XRD, DSC, TEM, XPS, ICP and H 2-TPD showed that the addition of Mo could enhance the extent of long-range disorder, reduce the particle diameter from 60 nm to 15 nm, weaken the strength of Ni-H bond, improve the thermal stability and antioxidation, which resulted in the increasing activity of Ni-B. when the molar fraction of Mo was 6%, the conversion of DNT and the selectivity of TDA reached 99.8% and 100%, respectively.


Yan S.,Taiyuan University of Technology | Yan S.,Sedin Engineering Company Ltd | Fan H.,Sedin Engineering Company Ltd | Liang C.,Taiyuan University of Technology | And 2 more authors.
Cuihua Xuebao/Chinese Journal of Catalysis | Year: 2012

Ni-La-B amorphous alloy catalyst was prepared by KBH 4 reduction for liquid phase hydrogenation of dinitrotoluene (DNT) to diaminotoluene (DAT). The effect of La content on microstructure and catalytic performance of Ni-La-B amorphous alloy catalyst for DNT hydrogenation was investigated. The catalyst was characterized by X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, X-ray photoelectron spectroscopy, inductively coupled plasma emission spectroscopy, and H 2 temperature-programmed desorption. The results showed that the addition of La could enhance the degree of long-range disorder, reduce the particle diameter from 70 to 10 nm, weaken the strength of Ni-H bond, and improve the thermal stability and antioxidation. The increasing of La addition from 0 to 6% (molar fraction) led to the enhancement of catalytic performance. When the addition of La was 0.6%, Ni-La-B catalyst exhibited the highest performance for low-pressure (1 MPa) DNT hydrogenation, the conversion of DNT and selectivity for DAT reached 100%. Further increasing of La addition from 6% to 8% led to decrease of the surface Ni content and the catalytic activity obviously.


Li F.,Taiyuan University of Technology | Li X.-H.,Taiyuan University of Technology | Yao R.-S.,Taiyuan University of Technology | Chang L.-P.,Taiyuan University of Technology | Zhang Q.-G.,Sedin Engineering Co.
Energy Sources, Part A: Recovery, Utilization and Environmental Effects | Year: 2012

More attention has been paid to effective utilization of poor quality coal due to energy sources being increasingly in short supply. There are an abundance of coals with high ash (A d > 40%), high sulfur (S t > 2%), and high ash melting point coal (>1,500C) in Shanxi province of China, and their reasonable use has become a stringency task. Gasification is advised as a way of utilization according to economy demand. For this purpose, kinetics study on the gasification of poor quality coal has been presented in this article. Experimental work was carried out to study the kinetics of carbon dioxide or steam gasification of coal with high ash, high sulfur, and high ash melting point (tri-high coal). Also, more useful information was obtained from investigation of gasification kinetics behavior. The results will be used to determine the kinetic parameters for gasification, which are to be used in the numerical modeling of tri-high coal gasification. © 2012 Copyright Taylor and Francis Group, LLC.


Cui X.-X.,Taiyuan University of Technology | Cui X.-X.,Sedin Engineering Company Ltd | Meng F.-H.,Taiyuan University of Technology | He Z.,Taiyuan University of Technology | And 2 more authors.
Chinese Journal of Inorganic Chemistry | Year: 2014

Nickel-based catalysts were prepared with different metal promoters by incipient impregnation method, and the catalytic performance of CO methanation were studied in slurry-bed reactor. XRD, H2-TPR, and HR-TEM were used to characterize the catalysts, the results show that additives of Zr, Co, Ce, Zn, La improved the dispersion of Nickel species on support, and decreased the particle size of Ni and reduced the reduction temperature of catalyst, while the additive of Mg increased the reduction temperature. The catalytic results show that additives of Zr, Co, Ce, Zn, La improved the catalytic performance of CO methanation in slurry-bed reactor, especially the catalyst with La additive. Further investigation shows that when the loading of La reached 8%, the catalyst exhibited the best catalytic performance, with the conversion of CO of 96.3%, the selectivity and space-time yield (STY) of CH4 of 87.1% and 179.6 g·kg-1·h-1, respectively. While the catalyst doped with Mg additivie decreased the catalytic performance.


Gao B.,Hebei University of Technology | Zhou J.,Hebei University of Technology | Zhou J.,SEDIN Engineering Co. | Dong J.,Hebei University of Technology
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2013

With the aid of the magnetic measuring instrument FMP30, the deformation induced martensite contents(DIMC) of S30408 plate tensile specimen under different plastic deformation are measured to determine the relationship between the DIMC and the plastic strain. The DIMC of the dished head is measured for the inner vessel of a cryogenic liquid semi-trailer. The DIMC distribution along meridional direction is simplified to correlate with plastic strains in different region of the head due to process history. According to the bygone plastic strain, the stress-strain curve for every region of the head is determined for the ultimate bearing capacity analysis of the structure by nonlinear finite element method. Compared with the results obtained by the two other inelastic modes(considering the strain strengthening characteristics based on the true stress-strain relationship without bygone plastic strain in consideration; Elastic perfect plastic(EPP) mode without strain strengthening in consideration), it is found that, for the dished head made of S30408, the collapse load and the limit load with the strain strengthening characteristics in consideration are greater than that with the EPP model. The strain strengthening characteristics based on process history has little effect on the collapse load, but great effect on the limit load by bitangent method. It can significantly improve the limit load of the structure. © 2013 Journal of Mechanical Engineering.


Yang J.,Xi'an University of Architecture and Technology | Zhang T.,Sedin Engineering Co. | Peng Y.,Henan Electrical Power Survey And Design Institute
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2015

The joint stiffness is an important parameter in the design of steel tower structures. With the application of high strength steel in the substation frame structures, research on the flexural rigidity of the tubular joints that are made of high strength steel has become increasingly important. In this paper, an experiment study was conducted on three types of tubular joints which were enhanced by tile shaped plate, inner annular plate, and inner sleeve respectively, in order to get the influence of different reinforcement on the joint stiffness. By analyzing the different parameters of each enhanced method, the influence of various parameters on the joint stiffness was obtained. The stiffness performances of each joint were analyzed by the joint initial stiffness criterion specified in the European specification. The results show that the Q690 high strength steel enhanced tubular joints should not be taken as rigid joints in engineering design, but as semi-rigid joints. The action mechanism of tile shaped plate and inner annular plate on the tubular joint was explained at last. ©, 2015, Science Press. All right reserved.


Liu M.,China University of Petroleum - Beijing | Xie J.,China University of Petroleum - Beijing | Xie J.,SEDIN Engineering Co. | Meng Z.,China University of Petroleum - Beijing | Lu C.,China University of Petroleum - Beijing
Journal of Chemical Engineering of Japan | Year: 2015

The particle mixer has a wide application in the chemical and petrochemical industries. In order to achieve adequate and homogeneous particle mixing, a new type of particle mixer was proposed by coupling a pre-mixing section and an internally circulating fluidized bed mixing section. The bed density and particle circulating velocity, as well as the cold and hot particle mixing degree in the mixer were investigated with an optical fiber probe and thermal particle tracer technology. Bed density in the internally circulating fluidized bed mixing section decreased with the increase of the superficial gas velocity in the draft tube, but changed slightly with the rise of the particle feeding mass flow rate. The radial evolution of the dimensionless bed density in the draft tube was approximative under different operating conditions. With the increase of the superficial gas velocity and particle feeding mass flow rate, both the particle circulating velocity and circulating mass flow rate increased, within 0.23 to 0.28 m/s, and between 90 kg/(m2 s) and 10 kg/(m2 s), respectively. The mixing performance was improved as the superficial gas velocity increased, while it changed only slightly with the rise of the particle feeding mass flow rate. The radial particle mixing was significant in the pre-mixing section where the mixing index could reach 0.7, and then in the draft tube where the mixing index could reach 0.95. © 2015 JTohuer nSoalc oieft Cy hoef mChiceaml Eicnagli Ennegerininege rosf, Japan.

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