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Patent
Sinopec, Xiamen University and Shanghai Research Institute of Chemical Industry | Date: 2016-10-19

A ligand based chromium catalyst and application in catalyzing ethylene oligomerization are disclosed. The chromium catalyst is formed by a chromium compound and an organic ligand containing P and/or N. The substituents on N and P of the ligand can be replaced, whereby selective ethylene trimerization and tetramerization can be realized so as to produce 1-hexene and 1-octene at the same time.


Fang C.,University of Shanghai for Science and Technology | Fang C.,Shanghai University | Zhang D.,University of Shanghai for Science and Technology | Zhang D.,Shanghai University | And 6 more authors.
Catalysis Science and Technology | Year: 2013

Highly dispersed CeO2 on carbon nanotubes (CNTs) is successfully prepared by a pyridine-thermal route for selective catalytic reduction (SCR) of NO with NH3. This catalyst is mainly characterized by the techniques of X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-programmed reduction by hydrogen (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD) and X-ray photoelectron spectroscopy (XPS). The results of the XRD, TEM and TPR analysis show that the CeO2 particles on the CNTs are highly dispersed with a strong interaction between the particles and the CNTs. The NH3-TPD profiles indicate that this catalyst exhibits abundant strong acid sites. Furthermore, the O 1s XPS spectra show that the Oα/(O α + Oβ) ratio of this catalyst is very high, which can result in more surface oxygen vacancies and therefore favor the NH3-SCR reaction. Compared with the catalysts prepared by impregnation or physical mixture methods, the catalyst prepared by the pyridine-thermal route presents the best NH3-SCR activity in the temperature range of 150-380 °C as well as favourable stability and good SO2 or H2O resistance. More than 90% of NO can be removed in the range of 250-370 °C with a desirable N2 selectivity. Moreover, the NO conversion can be kept at about 97% with the presence of SO2 or H2O at 300 °C. In addition, this catalyst shows a high catalytic activity with a NO conversion remaining constant at ca. 98% during a 16 h continuous run duration at 300 °C. Highly dispersed CeO 2 on the CNTs as well as the strong interaction between the particles and the CNTs, the large amounts of strong acid sites and the high O α/(Oα + Oβ) ratio could be ascribed to the excellent NH3-SCR performance of the catalyst prepared by the pyridine-thermal route. © 2013 The Royal Society of Chemistry.


News Article | December 8, 2016
Site: en.prnasia.com

LISHUI, China, Dec. 8, 2016 /PRNewswire/ -- Tantech Holdings Ltd. (TANH) (Nasdaq: TANH) ("Tantech" or the "Company") announced today that it has successfully developed the new generation of infrared bamboo charcoal bedding articles, which feature excellent absorption, infrared and self-warming properties. These capabilities have been verified by the China National Supervision and Test Center for Eco-Product Quality, China National Supervision and Test Center for Infrared Product Quality, and Shanghai Research Institute of Chemical Industry Testing Center. The new generation of infrared bamboo charcoal bedding articles includes bamboo charcoal fiber bedclothes, health-care mattress and pillows. According to TANH engineers, the bamboo charcoal is made out of carefully-selected high quality natural Moso bamboo, or tortoise-shell bamboo, and carbonized at a temperate of 1,100 degrees centigrade. Compared to the predecessors, the new products have a more extensive micro porous structure and a higher specific surface area. By releasing abundant highly active anion, they can effectively absorb the smell of human body and eliminate sweat odor, helping revitalize and moisture skin. Meanwhile, the far infrared rays emitted by the bamboo charcoal can store energy and warm up human body to make sleep more comfortable. TANH Chairman Zhengyu Wang said the company has got rewarded for its vigorous research and development efforts. In addition to the upgraded bamboo charcoal products, the company has recently had three of its new energy vehicle models approved by the Ministry of Industry and Information for future launches. With the established postdoctoral workstation and researcher center, in the future the company will ramp up research and development on carbon materials, super electronic double layer capacitor carbon, batteries and new energy vehicles. The recent achievements will help the company lift sales, improve revenue and expand market share. As a leading bamboo charcoal manufacturer, TANH's products have long been welcomed by consumers. The company's "Dr. Charcoal" series, has launched more than 100 bamboo charcoal products that have capabilities of eliminating odor and purifying air. The "Dr. Charcoal" series, which enjoys wide recognition in China, has reached consumers in overseas markets including the United States, Japan, Korea and Europe. Established in 2001 and headquartered in Lishui City, Zhejiang Province, China, Tantech Holdings Ltd. ("Tantech" or the "Company"), together with its subsidiaries, develops and manufactures bamboo-based charcoal products, including a variety of branded consumer products and electric double-layer capacitor ("EDLC") carbon products for industrial energy applications. The Company is in the process of acquiring 100% interest in Suzhou E Motors Co., Ltd., a specialty electric vehicles and power batteries manufacturer based in Zhangjiagang City, Jiangsu Province, and aims to transform itself from a bamboo-based charcoal products producer to a vertically integrated company along the EDLC Carbon - power battery - specialty new energy vehicle value chain. For more information about Tantech, please visit: http://www.tantech.cn/en/index.asp. This news release contains forward-looking statements as defined by the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements that are other than statements of historical facts. These statements are subject to uncertainties and risks including, but not limited to, product and service demand and acceptance, changes in technology, economic conditions, the impact of competition and pricing, government regulations, and other risks contained in reports filed by the company with the Securities and Exchange Commission. All such forward looking statements, whether written or oral, and whether made by or on behalf of the Company, are expressly qualified by this cautionary statement and any other cautionary statements which may accompany the forward-looking statements. In addition, the Company disclaims any obligation to update any forward-looking statements to reflect events or circumstances after the date hereof. For more information, please contact: To view the original version on PR Newswire, visit:http://www.prnewswire.com/news-releases/tantech-develops-high-value-added-products-with-great-absorption-capacity-300375170.html


Liang S.,Nanjing University of Science and Technology | Zhu J.,Nanjing University of Science and Technology | Wang C.,Nanjing University of Science and Technology | Yu S.,Shanghai Research Institute of Chemical Industry | And 3 more authors.
Applied Surface Science | Year: 2014

A simple and straightforward strategy was developed for anchoring α-Fe2O3 nanoparticles on graphene as gas sensor material. The XRD and TEM results indicate that graphene sheets are decorated with α-Fe2O3 nanoparticles with various diameters and shapes. To demonstrate the potential applications, we have fabricated gas sensors using the as-synthesized α-Fe2O3@graphene and investigated sensor activity for ethanol detection. The results show that an appropriate content of graphene dopant could effectively enhance the gas-sensing properties of α-Fe2O3 operated at different temperatures. Especially, the α-Fe2O 3@graphene (contained 2 wt% of graphene) sensor exhibits better sensor performances in comparison with pure α-Fe2O3 counterpart, indicating the potential applications as sensor material toward ethanol detection. © 2013 Elsevier B.V.


Liu Y.,East China University of Science and Technology | Wang L.,East China University of Science and Technology | Zhang J.,East China University of Science and Technology | Chen L.,East China University of Science and Technology | Xu H.,Shanghai Research Institute of Chemical Industry
Microporous and Mesoporous Materials | Year: 2011

A layered mesoporous SAPO-34 with particle size of about 20 μm was synthesized by using as-synthesized SBA-15 as silica source. For comparison, another three synthesis system were adopted to form SAPO-34 by using stoichiometric equivalence of calcined SBA-15, physical mixture of calcined SBA-15 and P123, and physical mixture of colloidal silica and P123 as initial reactants, respectively. The result shows that SAPO-34 can be prepared by all of the synthesis systems, however, only the sample prepared with as-synthesized SBA-15 shows mesoporous structure as revealed by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). Compared with SAPO-34 prepared with conventional and the above three contrasting systems, the specific surface area of this sample is considerably improved due to the existence of mesoporous structure. For the application as the catalyst for methanol to olefins (MTO) reaction, the layered mesoporous SAPO-34 presents the longest single life among all of samples. © 2011 Elsevier Inc. All rights reserved.


Li Z.,Shanghai Research Institute of Chemical Industry | Zhang W.,Shanghai Research Institute of Chemical Industry | Wang X.,Shanghai Research Institute of Chemical Industry | Mai Y.,Shanghai Research Institute of Chemical Industry | Zhang Y.,Shanghai Research Institute of Chemical Industry
Applied Surface Science | Year: 2011

In this study, a sequential photoinduced graft polymerization process was proposed to improve the poor interfacial bonding property of ultra high molecular weight polyethylene (UHMWPE) fibers. The polymerization was initiated by dormant semipinacol (SP) groups and carried out in a thin liquid layer. Methacrylic acid (MAA) and acryl amide (AM) were grafted stepwise onto the surface of UHMWPE fibers. Attenuated total reflectance infrared spectroscopy (ATR-IR) and thermo gravimetric analysis (TGA) confirmed the grafting. The analysis result of pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) indicated the structure of grafted chains. Scanning electron microscopy (SEM) images and atomic force microscopy (AFM) images revealed the apparent morphology changing, and the grafted layers were observed. Interfacial shear stress (IFSS) test of the modified fibers showed an extensively improved interfacial bonding property. The active groups grafted onto the fibers would supply enough anchor points for the chemical bonding with various resins or further reactions. © 2011 Elsevier B.V. All rights reserved.


Fan Z.,Zhejiang University | Zhang L.,Shanghai Research Institute of Chemical Industry | Xia S.,Zhejiang University | Fu Z.,Zhejiang University
Journal of Molecular Catalysis A: Chemical | Year: 2011

1-Hexene homopolymerization and 1-hexene-ethylene copolymerization with TiCl4/MgCl2-Al(C2H5)3 catalyst were compared to investigate the effect of ethylene on the distribution of active centers. The polymerizations were quenched with cinnamoyl chloride, and the number of active centers ([C*]/[Ti]) was determined by measuring the cinnamoyl group labeled on the propagation chains. Both polymer samples were fractionated into 9-10 fractions according to molecular weight, and [C*]/[Ti] in each fraction was also determined. Adding small amount of ethylene in 1-hexene polymerization markedly increased the number of active centers that produce low molecular weight polymer. This phenomenon agrees with the mechanism suggesting the presence of Ti-CH(CH3)(CH 2)3CH3 type dormant sites and their activation by ethylene. The kp value of the newly emerging active centers in the copolymerization system is much lower than that of the homopolymerization system. In the copolymerization system, the active centers producing polymer chains of the second highest molecular weight and isotacticity show the highest kp value, while those producing polymer of the highest molecular weight and isotacticity show only the second highest kp. On the other hand, the active centers producing polymer with lower-middle chain length show the lowest ethylene incorporation rate. These results disclose differences of catalytic properties between the multiple active center types and correlations between their different kinetic parameters, which may lead to new understanding of the active centers and polymerization mechanism. © 2011 Elsevier B.V. All rights reserved.


Wang P.,East China University of Science and Technology | Wang P.,Shanghai Research Institute of Chemical Industry | Lv A.,Shanghai Research Institute of Chemical Industry | Hu J.,Shanghai Research Institute of Chemical Industry | And 2 more authors.
Microporous and Mesoporous Materials | Year: 2012

In order to enhance the catalytic performance of SAPO-34 for the reaction of methanol to olefins (MTO), a mixture template of triethylamine (TEA) and tetraethyl ammonium hydroxide (TEAOH) was used to synthesize SAPO-34. The effects of the composition of the mixed template on the chemical composition, morphology and surface acidity of SAPO-34 were characterized by XRD, SEM, XRF, Si MAS NMR and NH 3-TPD techniques. The catalytic performance of prepared SAPO-34 was investigated in a fixed-bed reactor at 450°C for the MTO reaction. The results show that the chemical composition, morphology, crystal size and Si incorporation of SAPO-34 are affected greatly by the molar ratio of TEAOH/TEA. For the MTO reaction, all catalysts prepared show similar methanol conversion and product distribution, but their olefins selectivity and lifetime are greatly dependent on the ratio of TEAOH/TEA in the synthesis solution. Comparing with the SAPO-34 synthesized with single template, SAPO-34 synthesized with TEAOH/TEA = 0.1 possesses larger surface area, mild acidity and small crystal size and exhibits higher selectivity to light olefins (C2-C4), longer lifetime and lower carbon deposition rate. © 2011 Elsevier Inc. All rights reserved.


Wang P.,East China University of Science and Technology | Wang P.,Shanghai Research Institute of Chemical Industry | Yang D.,Shanghai Research Institute of Chemical Industry | Hu J.,Shanghai Research Institute of Chemical Industry | And 2 more authors.
Catalysis Today | Year: 2013

SAPO-34 crystallites with 160-550 nm were synthesized by a two-step hydrothermal crystallization and characterized by XRD, SEM, XRF, low-temperature N2 adsorption and NH3-TPD. The H2O2 aqueous solution was used to remove template. The size effects of SAPO-34 crystallites on its catalytic performance (the catalytic activity, lifetime and coking formation) were investigated for the conversion of methanol to olefins (MTO). Comparing with SAPO-34 sample (I) prepared by traditional one-step hydrothermal crystallization, the sample (II) prepared by a two-step hydrothermal crystallization possesses the similar CHA structure, cubic-like rhombohedra morphology, chemical composition and Si environment as sample (I); however, the sample (II) has smaller crystallite (160 nm), larger surface area (648 m2/g) and more acid sites than the sample (I) (1100 nm, 498 m2/g). For the MTO reaction, the olefins selectivity and lifetime strongly depend on the crystallite sizes of SAPO-34 catalyst, and the smaller the crystallite sizes of SAPO-34 and the better its catalytic performance is. Using the catalyst (II), the olefins selectivity and lifetime in single run can reach more than 94.9% and 10 h, respectively. Therefore, this two-step hydrothermal crystallization developed here offers a promising strategy to control the crystallite size of SAPO-34, and SAPO-34 with small crystallite size is an excellent candidate of catalyst for MTO process. © 2012 Elsevier B.V. All rights reserved.


Patent
Shanghai Research Institute of Chemical Industry | Date: 2014-05-28

The present invention relates to an n-heterocyclic carbene (NHC) type palladium catalyst and its preparation method as well as applications. Its preparation process is as below: select glyoxal as the raw material to synthesize glyoxaldiimine in the presence of Lewis acid or Bronsted acid, and then react with paraformaldehyde to get the NHC type ligand. Use palladium^((II) )to react with the compound containing carbon-nitrogen double bonds to get palladium^((II) )cyclic dimer; make the palladium cyclic dimer and the NHC type ligand coordinated to get the NHC type palladium catalyst. The palladium catalyst with a brand new structure according to the present invention, boasts high activity and multi-purpose. In addition, it shows excellent reaction activity in a lot of catalytic-coupling reactions including Suzuki-Miyaura, Heck, Buchwald-Hartwig, Kumada-Tamao-Corriu, Sonogashira, Negishi and -ketone arylation reactions, and some reactions even can be carried out with the presence of an extremely low concentration of catalyst, exhibiting favorable industrialization prospect.

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