High performance oxygen permeable membranes with Nb-doped BaBi0.05Co0.95O3-δ perovskite oxides

10.1016/j.memsci.2012.11.072Journal of Membrane Science431180-186JMES

La0.6Sr0.4Co0.8Ni0.2O 3-δ hollow fiber membrane reactor: Integrated oxygen separation-CO2 reforming of methane reaction for hydrogen production

10.1016/j.ijhydene.2013.01.073International Journal of Hydrogen Energy38114483-4491IJHE

A new asymmetric SrCo0.8Fe0.1Ga0.1O3-δ perovskite hollow fiber membrane for stable oxygen permeability under reducing condition

10.1016/j.memsci.2012.11.005Journal of Membrane Science42878-85JMES

CO2 dry-reforming of methane over La0.8Sr 0.2Ni0.8M0.2O3 perovskite (M = Bi, Co, Cr, Cu, Fe): Roles of lattice oxygen on C-H activation and carbon suppression

10.1016/j.ijhydene.2012.04.059International Journal of Hydrogen Energy371511195-11207IJHE

Chemical characterization of medium-chain-length polyhydroxyalkanoates (PHAs) recovered by enzymatic treatment and ultrafiltration

BACKGROUND: Medium-chain-length polyhydroxyalkanoates (PHAs) are biodegradable polyesters accumulated intracellularly as energy resources by bacterial species such as Pseudomonas putida. The most popular method for PHA recovery is solvent extraction using trichloromethane (chloroform) and methyl alcohol (methanol). An alternative method is enzymatic treatment, which eliminates usage of these hazardous solvents. This research focuses on the characterization of PHAs recovered by enzymatic treatments and ultrafiltration. Comparisons are made with conventional solvent extracted PHA. RESULTS: The purity of PHA in water suspension recovered by enzymatic treatments as analyzed by gas chromatography was 92.6. Enzymatically recovered PHA was comparable to conventional solvent-extracted PHA, which had a purity of 95.5. PHA was further characterized for functional group analysis, structural composition analysis and molecular weight determination. It was found that the molecular weight of the PHA recovered by enzymatic treatment was less than solvent-extracted PHA, probably due to degradation of the lipopolysaccharide layer. However, functional group and structural composition analyses showed similar results for PHA recovered by both methods. CONCLUSION: PHAs recovered through enzymatic digestion treatment have good comparability with solvent-extracted PHAs. Thus enzymatic digestion has great potential as an alternative recovery method. (C) 2007 Society of Chemical Industry

Inverse NiAl2O4 on LaAlO3-Al 2O3: Unique catalytic structure for stable CO2 reforming of methane

10.1021/jp401855xJournal of Physical Chemistry C117168120-813

Oxygen permeation and stability study of La0.6Sr0.4Co0.8Ga0.2O3-δ (LSCG) hollow fiber membrane with exposure to CO2, CH4 and He

10.1016/j.memsci.2012.09.014Journal of Membrane Science427240-249JMES

Oxidative CO2 reforming of methane in La0.6Sr 0.4Co0.8Ga0.2O3-δ (LSCG) hollow fiber membrane reactor

10.1021/es403158kEnvironmental Science and Technology472414510-14517ESTH

Highly Active Ni/<i>x</i>Na/CeO₂ Catalyst for the Water–Gas Shift Reaction: Effect of Sodium on Methane Suppression

The effect of Na loading on the water–gas shift (WGS) activity of Ni/<i>x</i>Na/CeO₂ (with <i>x</i> = 0, 0.5, 1, 2, 5, and 10 wt %) catalysts has been investigated. Ni/2Na/CeO₂ exhibited the highest performance in terms of WGS activity and methane suppression. Through H₂-TPR and XRD, the solubility limit of Na⁺ in CeO₂ was found to be 2 wt %. At low loadings of Na (0.5 to 2 wt %), Na⁺ was incorporated into the CeO₂ lattice, generating a lattice strain and activating the lattice O₂, thereby increasing the reducibility of the catalyst. However, beyond the solubility limit of 2 wt %, Na deposited on the CeO₂ surface, retarding the reducibility of the catalyst. XPS spectra reveal greater surface concentration of adsorbed oxygen species with the introduction of Na. This can be attributed to the generation of more oxide vacancies for oxygen adsorption due to Na substitution into the ceria lattice. By in situ DRIFTS, methanation was found to be inhibited by the interaction between Na and Ni, leading to the absence of subcarbonyl species which are responsible for this undesirable side reaction