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Creating mesopores in ZSM-48 zeolite by alkali treatment: Enhanced catalyst for hydroisomerization of hexadecane

Journal of Energy Chemistry 2016年第3期25卷 539-544页

作者： Miao Zhang Lei Wang Yujing Chen Qiumin Zhang Changhai Liang Laboratory of Advanced Materials and Catalytic Engineering School of Chemical Engineering Dalian University of Technology State Key Laboratory of Fine Chemicals Institute of Coal Chemical Engineering Dalian University of Technology

ZSM-48 zeolites with various Si/Al ratios were hydrothermally synthesized in the H;N（CH;）;NH;（HDA）-containing media. The obtained samples were highly crystallized with minor mixed phases as evidenced by X-ray powder diffraction（XRD）. The alkaline treated ZSM-48 zeolites maintained its structure under different concentrations of Na OH aqueous solution. Micropores remained unchanged while mesopores with wide pore size distribution formed after the alkaline treatment. The surface area increased from 228 to 288 m;/g. The Br?nsted acid sites had little alteration while an obvious increase of Lewis acid sites was observed. The hydroisomerization of hexadecane was performed as the model reaction to test the effects of the alkali treatment. The conversion of hexadecane had almost no change, which was attributed to the preservation of the Br?nsted acid sites. While high selectivity to iso-hexadecane with an improved iso to normal ratio of alkanes was due to the mesopore formation and improved diffusivity.

关键词： ZSM-48 Alkali treatment Hydroisomerization Mesopore hexadecane

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Preparation and characterization of hexadecane microcapsule with polyurea-melamine formaldehyde resin shell materials

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Chinese Chemical Letters 2010年第5期21卷 533-537页

作者： Gao, Gui Bo Qian, Chun Xiang Gao, Min Jie Southeast Univ Sch Mat Sci & Engn Nanjing 211189 Peoples R China

This paper gives a brief report of the preparation of hexadecane microcapsule with polyurea–melamine formaldehyde resin shell materials (HMPM). The sealing performance and thermal stability of HMPM was enhanced much more effectively than that of microcapsule with polyurea shell material (HPM). The results of microscopical imaging analysis system, DSC, TG, and laser particle analyzer were briefly introduced.

关键词： hexadecane Polyurea Melamine formaldehyde resin Microcapsule Phase change properties

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Surface passivation and boundary lubrication of self-mated tetrahedral amorphous carbon asperities under extreme tribological conditions

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Friction 2014年第2期2卷 193-208页

作者： Pedro A.ROMERO Lars PASTEWKA Julian VON LAUTZ Michael MOSELER Fraunhofer Institute for Mechanics of Materials IWM Wöhlerstraße 1179108 FreiburgGermany Karlsruhe Institute of Technology IAM-ZBSKaiserstraße 1276131KarlsruheGermany Freiburg Materials Research Center Stefan-Meier-Straße 2179104FreiburgGermany University of Freiburg Physics DepartmentHermann-Herder-Straße 379104 FreiburgGermany

Tetrahedral amorphous carbon coatings have the potential to significantly reduce friction and wear between sliding ***,we provide atomistic insights into the evolution of the sliding interface between naked and hydrogen-passivated ta-C sliding partners under dry and lubricated *** reactive classical atomistic simulations we show that sliding induces a sp3 to sp2 rehybridization and that the shear resistance is reduced by hydrogen-passivation and hexadecane-lubrication-despite our finding that nanoscale hexadecane layers are not always able to separate and protect ta-C counter surfaces during *** asperities deform,carbon atoms within the hexadecane lubricant bind to the ta-C sliding partners resulting in degradation of the hexadecane molecules and in increased material intermixing at the sliding *** atoms from the passivation layer and from the hexadecane chains continue to be mixed within a sp2 rich sliding interface eventually generating a tribo-layer that resembles an a-C:H type of *** separation of the sliding partners,the tribo-couple splits within the newly formed sp2 rich a-C:H mixed layer with significant material transfer across the sliding *** leaves behind a-C:H coated ta-C surfaces with dangling C bonds,linear C chains and hydrocarbon fragments.

关键词： Atomic-scale simulations DLC lubrication hexadecane passivation sliding mixed layer wear

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More than Color:Pigments with Thermal Storage Capacity;Processing and Degradation Behavior

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Advances in Materials Physics and Chemistry 2015年第5期5卷 171-184页

作者： Estibaliz Aranzabe Pedro Maria Villasante Ricard March Maria Isabel Arriortua Aitor Larranaga Ana Aranzabe IK4-Tekniker EibarSpain Nubiola Pigmentos S.L. LaudioSpain Facultad de Ciencia y Tecnología Universidad del País Vasco(UPV/EHU)LeioaSpain

A standard ultramarine pigment was used to produce phase change material composites, by adsorbing n-hexadecane paraffin around the pigment surface with the aim of obtaining a pigment providing thermal storage capacity apart from color. Vacuum impregnation method was employed optimizing the process variables to maximize the latent heat of the hexadecane/pigment composite. In addition to the process optimization, the stability of the composite having the maximum latent heat was investigated. The hexadecane/pigment composite providing the highest latent heat has a Latent heat of fusion of 44 J/g (around a 20%wt. hexadecane adsorbed in the pigment). Durability of the material was tested by thermo-diffractometric measurements. The results indicate slow reduction of the area intensity up to 6.5% after the 100 cycles.

关键词： Ultramarine Blue hexadecane Phase Change Material Thermal Storage

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