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Xu, M.,Ellis, N.,Jim Lim, C.,Ryu, H.-J. WILEY-VCH Verlag 2009 Chemical engineering & technology Vol.32 No.3
<P>As a promising way of integrating combustion, CO<SUB>2</SUB> separation, and pollution control with high efficiency and low cost, Chemical Looping Combustion (CLC) has gained attention in recent years. A cold model circulating fluidized bed reactor for chemical looping combustion was designed and operated, in which an additional loop was used to transfer back some oxygen carriers to the air reactor directly for continuous oxidation. Operating conditions of the cold model were investigated as the superficial gas velocities in the reactors and seal-loops were varied. Their effects on the pressure balance and solids circulation rates in two loops were tested. The experimental results provided a detailed mapping of the range of operating conditions and assisted in the understanding of critical variables controlling the operation of the CLC reactor system. The appropriate operating conditions were optimized for developing the reactor model for CLC.</P> <B>Graphic Abstract</B> <P>A novel interconnected fluidized bed reactor for chemical looping combustion was designed and operated. The detailed mapping of the operating conditions was tested to assist in the development and the operations of the reactor system. <img src='wiley_img/09307516-2009-32-3-CEAT200800565-content.gif' alt='wiley_img/09307516-2009-32-3-CEAT200800565-content'> </P>
Novel non-alloy Ru/Pd composite membrane fabricated by electroless plating for hydrogen separation
Ryi, Shin-Kun,Li, Anwu,Lim, C. Jim,Grace, John R. Elsevier 2011 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.36 No.15
<P><B>Abstract</B></P> <P>This study presents a new non-alloy Ru/Pd composite membrane fabricated by electroless plating for hydrogen separation. It shows that palladium and ruthenium can be deposited on an aluminum-oxide-modified porous Hastalloy by using our new EDTA-free plating bath at room temperature and 358 K, respectively. A 6.8 μm thick non-alloy Ru/Pd membrane film could be plated and helium leak test confirmed that the membrane was free of defects. Hydrogen permeation test showed that the membrane had a hydrogen permeation flux of 4.5 × 10<SUP>−1</SUP> mol m<SUP>−2</SUP> s<SUP>−1</SUP> at a temperature of 773 K and a pressure difference of 100 kPa. The hydrogen permeability normalized value with thickness of the membrane was 1.4 times higher than our pure Pd membrane having similar structure. The EDX profiles of the front and back side membrane, cross-sectional EDX line scanning and XRD profile show that there was no alloying progress between the palladium and ruthenium layer after hydrogen permeation test at 773 K.</P>
Ryi, Shin-Kun,Xu, Nong,Li, Anwu,Lim, C. Jim,Grace, John R. Elsevier 2010 International journal of hydrogen energy Vol.35 No.6
<P><B>Abstract</B></P><P>This study demonstrates palladium membranes can be electrolessly plated on aluminum oxide-modified porous Hastelloy with hydrazine using an EDTA-free bath. The plating bath temperature affected the membrane surface morphology, with the palladium grain size increasing with increasing temperature. A 7.5μm thick membrane plating was obtained at room temperature. Helium leak testing confirmed that the membrane was free of defects. Hydrogen permeation test showed that the membrane had a hydrogen permeation flux of 3.3×10<SUP>−1</SUP>molm<SUP>−2</SUP>s<SUP>−1</SUP> at a temperature of 823K and at a pressure difference of 100kPa. There was no measurable interdiffusion between the membrane film and the porous Hastalloy substrate at 823K. This room temperature membrane plating method provides several advantages such as very high selectivity, stability, favorable energy efficiency and simplicity.</P>
Arian Ebneyamini,Jun Young Kim,Zezhong John Li,John R. Grace,C. Jim Lim,Naoko Ellis 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.87 No.-
This paper investigates the equilibrium performance of CaO hydration and CaCO3/Ca(OH)2 co-calcinationin calcium-looping processes. A novel lime hydration configuration is proposed, introducing saturatedsteam as the reactivating reagent and direct-heat-removal medium. The proposed hydrator generates asubstantial amount of superheated steam, used elsewhere as required. The slaked lime and limestone arecalcined simultaneously in a methane-concentrated oxy-fuel calciner. The equilibrium performance ofthe co-calciner is studied at different reactor temperatures, operating pressures, solid/gas feed ratios andfeed compositions. A correlation is proposed which estimates the required gaseous feed composition forautothermal, coke-free and complete sorbent regeneration using this novel technology.