Time filter

Source Type

Song H.,Northeast Petroleum University | Dong H.,Northeast Petroleum University | Li F.,Northeast Petroleum University | Wang S.,Chemical Industry Company Ltd
Petroleum Processing and Petrochemicals | Year: 2012

Pt/TiO 2 catalyst was prepared by microemulsion system of CTAB/butarol/cyclohexane/ H 2PtCl 6 usinghydrazine as reductant and TiO 2 as support. The effect of microemulsion compositions and the crystalline state of TiO 2 on the activities of Pt/TiO 2 catalysts for selective hydrogenation was studied using o-chloronitrobenzene (o-CNB) selective hydrogenation as a probe reaction. The results showed that Pt/TiO 2 catalyst having the highest activity in selective hydrogenation of o-CNB was prepared from a microemulsion system with M ctab M butanol - 3 : 7, (M ctab M butanol) : M cyclohexane=3: 7 and the amount of H 2PtCl 6 solution occupied 3.6% of the total system mass. Furthermore, the study of crystalline states revealed that anatase type TiO 2was helpful to enhance the catalytic activity of Pt/TiO 2 catalyst.

Li H.-J.,Northwest University, China | Liu C.-G.,Dalian University of Technology | Jiao F.,Chemical Industry Company Ltd | Lin G.-F.,1st Engineering Co.
Journal of the International Association for Shell and Spatial Structures | Year: 2011

Parametric sensitivity is important for reliability design, optimization and evaluation. The parametric sensitivity and reliability of two typical spatial structures, a star-shaped dome and a lattice truss, are investigated. Four parametric importance measures are employed to identify the relative importance of each random variable under deformation capacity limit state, and the sensitivities of their means and standard deviations on the reliability index are researched. The FOSM (first-order second moment) and the FORM (first-order reliability method) are employed to carry out the sensitivity analysis. The main conclusions are as follows: the influence of the randomness of nodal coordinates on the reliability and sensitivity of these two spatial structures cannot be neglected as it can play an important role; the variables reduction technique (VRT) is an effective way to reduce the considerable computational efforts of reliability analysis for large-scale space structures; the reliabilities of these two structures will decrease with the increase in correlation between the variables.

Xu F.,Shanxi Institute of Coal CAS Chemistry | Xu F.,University of Chinese Academy of Sciences | Dong M.,Shanxi Institute of Coal CAS Chemistry | Gou W.,Chemical Industry Company Ltd | And 4 more authors.
Microporous and Mesoporous Materials | Year: 2012

Two methods were used to control the crystal size of ZSM-5 synthesized with commercial silica sol. One is use of organic additives; the other is use of colloidal silicalite-1 seed. Addition of polyethylene glycol (PEG) to the synthesis gel favors the formation of relatively small uniform crystals because of promotion of nucleation and somehow hindering the growth of crystals, although it has little influence on the structure, crystallinity, acidity, and crystal shape. The prepared catalyst shows higher catalytic stability than the sample synthesized with the PEG-free gel in the methanol-to-hydrocarbon (MTH) reaction. Finely controllable synthesis of different-sized ZSM-5 crystals was realized by epitaxially growing ZSM-5 crystals around colloidal silicalite-1 seed. The crystal size could be tuned from 200 to 1000 nm by every 100 nm through adjusting the crystallization time and the amount of the added silicalite-1 seed. This makes it possible to systematically study the effect of zeolite crystal size on its catalytic performance and tune product distribution. A significant increase in the catalytic stability was observed with decreasing crystal size for ZSM-5 catalyzing MTH reaction. The crystals with a size of about 270 nm showed a catalytic life of about 6 and 3 times as long as those of the samples synthesized in the absence and presence of PEG respectively. © 2012 Elsevier Inc. All rights reserved.

Huang X.-F.,Hangzhou Dianzi University | Li S.-J.,Chemical Industry Company Ltd | Wang G.-Q.,Hangzhou Dianzi University | Luo D.,Hangzhou Dianzi University | And 3 more authors.
Asia-Pacific Power and Energy Engineering Conference, APPEEC | Year: 2011

Micropump is one of the key components of MEMS, which has been used widely in many fields. This article focused on the review of micropumps driving and controlling and the application for micro power systems including microturbomachinery, micro fuel cells and microthrusters. © 2011 IEEE.

Cheng L.,Chemical Industry Company Ltd | Zhang H.-W.,Chemical Industry Company Ltd
Petrochemical Equipment | Year: 2015

According to the problem of shaft concentricity deviation of the syngas compressor turbine in a chemical plant due to stream pipeline stress, the reasons of the accident has been analyzed, and the comprehensive analysis has been made for the solutions for recovering turbine shaft concentricity and eliminating steam pipeline stress. Finally, according to the site situation, the turbine has been made to return to normal by adjusting the cylinder position and changing spring bracket and spring hanger.

Discover hidden collaborations