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Search Results: 1 - 10 of 52720 matches for " Chunbao (Charles) Xu "
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Recent Advances in Direct Coal Liquefaction
Hengfu Shui,Zhenyi Cai,Chunbao (Charles) Xu
Energies , 2010, DOI: 10.3390/en3020155
Abstract: The growing demand for petroleum, accompanied by the declining petroleum reserves and the concerns over energy security, has intensified the interest in direct coal liquefaction (DCL), particularly in countries such as China which is rich in coal resources, but short of petroleum. In addition to a general introduction on the mechanisms and processes of DCL, this paper overviews some recent advances in DCL technology with respect to the influencing factors for DCL reactions (temperature, solvent, pressure, atmospheres, etc.), the effects of coal pre-treatments for DCL (swelling, thermal treatment, hydrothermal treatment, etc.), as well as recent development in multi-staged DCL processes, DCL catalysts and co-liquefaction of coal with biomass.
Chunbao (Charles) Xu,Huasu Su,Daqiang Cang
BioResources , 2008,
Abstract: The present work aims to liquefy corn Distillers Dried Grains with Solubles (DDGS), a by-product in corn ethanol production, to produce liquid products as a potential substitute for petroleum-derived phenol or an additive in the manufacturing of phenolic resins. Efficient liquefaction of DDGS has been realized with hot-compressed phenol at 200-450oC. Effects of liquefaction temperature, initial phenol/DDGS ratio, residence time and catalysts on yields of liquefaction products, as well as characterizations of typical liquid and solid products, have been investigated. The yield of liquid products increased with temperature, while it peaked at around 300oC, due to condensation/cracking reactions of the liquid intermediates/products to form solid products (i.e., coke/char) at temperatures higher than 300oC. The liquid yield increased monotonically with the initial phenol/DDGS ratio for a specified treatment time and temperature. An increased residence time generally produced a lower yield of liquid products, and a higher yield of solid residue, which was likely due to the increased coke/char formation from liquid products for a prolonged residence time. The yield of liquid products reached a maximum of 97% at 300oC for 5 min-operation with Phenol/DDGS of 2/1. K2CO3, Rb2CO3 and NaOH were found very effective catalysts for enhancing the liquid yields. The use of these catalysts resulted in 25% increase in the liquid yields for 5 min-operation with Phenol/DDGS of 1/1 at 300oC.
Ash Deposition in Biomass Combustion or Co-Firing for Power/Heat Generation
Yuanyuan Shao,Jinsheng Wang,Fernando Preto,Jesse Zhu,Chunbao (Charles) Xu
Energies , 2012, DOI: 10.3390/en5125171
Abstract: This paper presents a concise overview of ash deposition in combustion or co-firing of biomass (woody biomass, agricultural residues, peat, etc.) with other fuels for power/heat generation. In this article, the following five research aspects on biomass combustion ash deposition are reviewed and discussed: influence of biomass fuel characteristics, deposit-related challenges, ash deposition monitoring and analysis of ash deposits, mechanisms and chemistry of fly ash deposition, and key technologies for reducing ash deposition and corrosion in biomass-involved combustion.
A Plasmid vector encoding functional human keratinocyte growth factor gene in vitro—Functional human KGF gene expression in vitro  [PDF]
Lin Qiu, Chunbao Guo
Journal of Biophysical Chemistry (JBPC) , 2010, DOI: 10.4236/jbpc.2010.11008
Abstract: In this study, we cloned human KGF (hKGF) genes using RT-PCR techniques and developed a eukaryotic expression plasmid vector capable of directing the expression of functional hKGF. Monolayer culture of human embryo lung fibro-blast (HLF) was used for isolation of total RNA. Then the total RNA was purified and reverse- transcribed into cDNA using an oligo (dT) primer. A full PCR fragment for hKGF was generated and cloned. Restriction digestion and nucleo-tide sequence analysis validated the complete hKGF transcription. The hKGF cDNA fragment was inserted into pEGFP-C2 vector by means of recombinant DNA technology and verified by restriction analysis and sequencing. We have constructed pEGFP-C2-hKGF encoding the green fluorescent protein (GFP). Furthermore, hKGF had the effect on AEC II proliferation. These results suggest that the potential appli-cation of a hKGF plasmid of gene expression should be useful for sustained AEC proliferation, and its in vivo efficacy needs to be validated. Keywords:
Chunbao Tang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809016936
Abstract: In the molecule of the title Schiff base compound, C19H15ClN2O2, the dihedral angle between the benzene ring and naphthyl ring system is 77.1 (2)°. In the crystal structure, centrosymmetrically related molecules are linked into dimers through pairs of intermolecular N–H...O hydrogen bonds, generating rings of graph set R22(8).
Chunbao Tang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809007624
Abstract: In the title mononuclear copper(II) complex, [Cu(C7H5ClNO)2], the Cu atom, situated on an inversion center, is four-coordinated, in a slightly distorted square-planar geometry, by the N- and O-donor atoms of two symmetry-related 4-chloro-2-(iminomethyl)phenolate Schiff base ligands.
Chunbao Tang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809014287
Abstract: In the title compound, C12H10O2, the aldehyde and methoxy groups are slightly twisted around the single bonds that join them to the naphthalene ring system. In the crystal structure, molecules are linked through intermolecular C—H...O hydrogen bonds, forming chains running along the c axis.
Chunbao Tang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809039233
Abstract: The title compound, [Ni(C8H8NO2)2], is a centrosymmetric mononuclear nickel(II) complex. The NiII ion, lying on an inversion centre, is four-coordinated in a square-planar geometry by two phenolate O and two imine N atoms from two symmetry-related 2-iminomethyl-5-methoxyphenolate ligands. In the crystal, molecules are linked into corrugated layers parallel to (100) by N—H...O hydrogen bonds.
Chunbao Tang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809039129
Abstract: The title mononuclear nickel(II) complex, [Ni(C18H18N2O4)(H2O)], possesses crystallographic mirror symmetry. The Ni atom is five-coordinated in a square-pyramidal geometry, with two imine N and two phenolate O atoms of the Schiff base ligand in the square plane, and the water O atom in the axial position. In the crystal, the molecules are linked via intermolecular O—H...O hydrogen bonds, forming chains along the a axis.
Chunbao Tang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809006084
Abstract: In the title mononuclear nickel(II) complex, [Ni(C20H20N2O2)], the Ni atom is four-coordinated in a square-planar geometry by the four donor atoms of the Schiff base ligand. The dihedral angle between the two benzene rings is 9.4 (2)°. The cyclohexyl group adopts a C-form chair conformation.
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