Liaoning Key Laboratory of Petrochemical Technology and Equipments

Dalian, China

Liaoning Key Laboratory of Petrochemical Technology and Equipments

Dalian, China

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Ni X.-L.,Dalian University of Technology | Liu J.,Dalian University of Technology | Liu Y.-Y.,Dalian University of Technology | Leus K.,Ghent University | And 8 more authors.
Chinese Chemical Letters | Year: 2017

Two types of Mo containing metal-organic frameworks, denoted as Mo@COMOC-4 and PMA@MIL-101(Cr), were synthesized respectively by a post-synthetic modification and a ship-in-bottle approach. The catalytic performance of both compounds in the epoxidation of propylene using cumene hydroperoxide (CHP) as oxidant was compared with MoO3@SiO2. A higher conversion (46.2%) and efficiency (87.4%) of CHP was observed for Mo@COMOC-4, whereas the heteropoly acids supported MIL-101 resulted in the decomposition of CHP due to its strong acidic character. Regenerability tests demonstrated that Mo@COMOC-4 could be reused for multiple runs without significant loss in both activity and stability. © 2017.


Wang W.,Dalian University of Technology | Wang W.,Yinchuan Science and Technology Vocational College | Xie H.,Dalian University of Technology | Xie H.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | And 5 more authors.
Huaxue Fanying Gongcheng Yu Gongyi/Chemical Reaction Engineering and Technology | Year: 2012

ZSM-5/MCM-41 mesoporous aluminosilicate molecular sieve(ZM) was hydrothermally synthesized by assembling zeolite subunits, which were generated from the hydrolysis of ZSM-5 in a Na 2SiO 3 aqueous solution, in the presence of cetyltrimethylammonium bromide as the template. The influence of the nitrogen-containing compound on the hydrodesulfurization performance of Pt carried by ZM was studied by using dibenzothiophene(DBT) and piperidine(Pi) as the model molecules. The results indicate that DBT HDS over Pt/ZM predominately takes the route of direct desulfurization (DDS). The addition of Pi strongly has inhibited the HDS of DBT. Compared with the DDS pathway, Pi shows stronger inhibition effect on the hydrogenation pathway (HYD), and the desulfurization of the sulfur-containing intermediates of the HYD pathway is almost completely suppressed by Pi. The kinetic study reveals that the HDS of DBT and the DDS pathway are first order while the HYD pathway is zero order under the conditions studied, suggesting that the DDS and HYD reactions may have taken place on different active sites of Pt/ZM.


Xu X.,Dalian University of Technology | Li X.,Dalian University of Technology | Li X.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | Wang A.,Dalian University of Technology | And 6 more authors.
Helvetica Chimica Acta | Year: 2011

1,2,3,4-Tetrahydro-4,6-dimethyldibenzothiophene was prepared by coupling 2-bromo-3-methylcyclohexanone with 2-methylbenzenethiol and annulating the product with the aid of polyphosphoric acid. A mixture of 1,2,3,4-tetrahydro-4, 6-dimethyldibenzothiophene and 4,6-dimethyldibenzothiophene was prepared by coupling 2-bromo-3-methylcyclohex-2-en-1-one with 2-methylbenzenethiol and annulating the product with the aid of polyphosphoric acid. 2-Bromo-3- methylcyclohexanone was synthesized by conjugate addition of Me3Al to 2-bromocyclohex-2-en-1-one with CuBr as catalyst and 2-bromo-3-methylcyclohex- 2-en-1-one by bromination-elimination of 3-methylcyclohex-2-en-1-one. 1,2,3,4,4a,9b-Hexahydro-4,6-dimethyldibenzothiophene was prepared by reduction of 1,2,3,4-tetrahydro-4,6-dimethyldibenzothiophene with Zn and CF 3COOH. Copyright © 2011 Verlag Helvetica Chimica Acta AG, Zürich, Switzerland.


Li X.,Dalian University of Technology | Li X.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | Zhang Y.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | Wang A.,Dalian University of Technology | And 4 more authors.
Catalysis Communications | Year: 2010

TiO2- and CeO2-promoted bulk Ni2P catalysts were prepared by impregnation and in-situ H2 temperature-programmed reduction method. The prepared catalysts were characterized by XRD and XPS. The hydrogenation activities of the catalysts were studied using 1.5 wt.% 1-heptene in toluene and 1.0 wt.% phenylacetylene in ethanol as the model feeds. The results indicate that bulk Ni2P possesses low hydrogenation activity but is tunable by simply controlling the content of the additives (TiO2 or CeO2), suggesting that TiO2 and CeO2 are effective promoters to enhance the hydrogenation activity of Ni2P. © 2010 Elsevier B.V.


Yang H.,Dalian University of Technology | Li X.,Dalian University of Technology | Li X.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | Wang A.,Dalian University of Technology | And 3 more authors.
Cuihua Xuebao/Chinese Journal of Catalysis | Year: 2014

MoO3/P25 catalysts were prepared by an impregnation method. The catalysts were characterized by X-ray diffraction, ultraviolet-visible spectrophotometry, Fourier transform infrared spectroscopy, and laser Raman spectroscopy, and their photocatalytic activty was evaluated by the degradation of methylene blue dye under visible light. The monolayer dispersion threshold of MoO3 on P25 was around 0.1 g/g. The strong interaction between the monolayer-dispersed tetrahedral-coordinated molybdenum oxide species and P25 led to a decrease in the band gap of P25, thus increasing the visible light absorption of the catalyst. Crystalline MoO3 was formed on catalysts with a MoO3/P25 mass ratio above 0.1. In these cases, the visible light absorption of the catalysts decreased with increasing MoO3 content. The band gap of the catalyst was not the only factor affecting its photocatalytic activity for the degradation of methylene blue under visible light. MoO3/P25 with the MoO3 to P25 mass ratio of 0.25, which possessed not only suitable band gap but also a certain amount of crystalline MoO3, showed the best catalytic performance. © 2014, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.


Li J.,Dalian University of Technology | Li X.,Dalian University of Technology | Li X.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | Wang A.,Dalian University of Technology | And 2 more authors.
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2010

Na2O was introduced to NiMo/MCM-41 catalyst precursor by different sequences, and the hydrodesulfurization (HDS) performances of the prepared catalysts were studied by using a model fuel of decalin solution containing 0.8% DBT. The results indicated that the introduction of Na2O not only facilitated the formation of β-NiMoO4, leading to decreased dispersion of active species, but also suppressed the reducibility of NiMo/MCM-41 precursor. The coordination states of Mo species were affected by Na2O introduced by the consecutive impregnation methods. The HDS activity of NiMo/MCM-41 was strongly affected by the Na2O introduction sequence. For the catalyst in which Na2O was introduced by a co-impregnation method, both the activities of the hydrogenation pathway (HYD) and direct desulfurization pathway (DDS) were suppressed, resulting in a decrease in the overall HDS activity. Compared with the co-impregnation and the introduction of Na2O after NiMo active components, the addition of Na2O before the deposition of these active components showed much less influence on the HYD activity, but significantly enhanced DDS activity of NiMo/MCM-41, thus an improvement in the overall HDS activity was observed. Both the activity and selectivity of the sulfide catalysts can be modified by adapting a proper addition sequence of the alkali-metal oxides, which is an effective way for the modification of HDS catalysts.


Ni X.,Dalian University of Technology | Liu J.,Dalian University of Technology | Wang A.,Dalian University of Technology | Wang A.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | And 2 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2016

Mesoporous Ti-MCM-41 molecular sieve was modified through nitridation with NH3 and silylation with trimethylchlorosilane(TMCS) separately, and the effects of the modification methods on the crystallinity, structure, acid strength and hydrophobicity of Ti-MCM-41 were studied by means of XRD, N2 adsorption-desorption, FTIR, Py-IR and UV-Vis. The catalytic performances of the modified Ti-MCM-41 catalysts in the epoxidation of propene with cumene hydroperoxide(CHP) to propylene oxide(PO) were investigated. The characterizations showed that, although the pores shrank and the crystallinity decreased, the ordered and uniform pores on all the catalysts were kept. In the epoxidation on the modified catalyst with NH3, the decreasing of acid strength inhibited the nonproductive decomposition of CHP, so the efficiency of CHP could increase from 66.1% to 80.4%. The silylation with TMCS could enhance the hydrophobicity of Ti-MCM-41, so the selectivity to PO reached 99.6%. © 2016, SINOPEC Beijing Research Institute of Chemical Industry. All right reserved.


Wu C.,Dalian University of Technology | Li X.,Dalian University of Technology | Li X.,Liaoning Key Laboratory of Petrochemical Technology and Equipments | Wang A.,Dalian University of Technology | Wang A.,Liaoning Key Laboratory of Petrochemical Technology and Equipments
Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) | Year: 2010

TiO2 modified Ni-Mo/MCM-41 hydrodesulfurization (HDS) catalysts were prepared by a consecutive impregnation method, and the effects of TiO2 as well as its introduction order on the HDS performance of Ni-Mo/MCM-41 were studied by using a model fuel of decalin containing 0.8% DBT. The UV-Vis, TPR and NH3-TPD results indicated that both the coordination states, the reducibility as well as the surface acidity of the oxidic precursor of Ni-Mo/MCM-41 were not remarkably affected by the introduction of TiO2. The HDS results showed that the addition of TiO2 suppressed the direct desulfurization pathway (DDS) activity of Ni-Mo/MCM-41, but significantly enhanced its hydrogenation pathway (HYD) activity, leading to an enhanced global HDS activity. The promoting effect was more pronounced when TiO2 was introduced after the impregnation of Ni-Mo over MCM-41. On the base of the product compositions, it is suggested that the improved HYD and HDS activities of TiO2-containg Ni-Mo/MCM-41 catalysts may be attributed to the enhanced acidity of the sulfides.

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