Comparison of different support materials for their capacity to immobilize Mycobacterium austroafricanum IFP 2012 and to adsorb MtBE

2007 ◽  
Vol 40 (6) ◽  
pp. 1524-1530 ◽  
Author(s):  
Darwin Lyew ◽  
Serge R. Guiot ◽  
Frédéric Monot ◽  
Francoise Fayolle-Guichard
Keyword(s):  
Support Materials ◽  
Mycobacterium Austroafricanum

Employing Exfoliated Graphite as Novel Support Material for Heterogeneous Model Catalysts

2019 ◽  
Author(s):  
Moritz Wolf ◽  
Nico Fischer ◽  
Michael Claeys
Keyword(s):  
Surface Area ◽  
Graphite Powder ◽  
Model Catalysts ◽  
Model Systems ◽  
Exfoliated Graphite ◽  
Support Material ◽  
Heterogeneous Model ◽  
Support Materials ◽  
Metal Support Interaction ◽  
Catalyst Systems

<p>The inert nature of graphitic samples allows for characterisation of rather isolated supported nanoparticles in model catalysts, as long as sufficiently large inter-particle distances are obtained. However, the low surface area of graphite and the little interaction with nanoparticles result in a challenging application of conventional preparation routes in practice. In the present study, a set of graphitic carbon materials was characterised in order to identify potential support materials for the preparation of model catalyst systems. Various sizes of well-defined Co<sub>3</sub>O<sub>4</sub> nanoparticles were synthesised separately and supported onto exfoliated graphite powder, that is graphite after solvent-assisted exfoliation <i>via</i> ultrasonication resulting in thinner flakes with increased specific surface area. The developed model catalysts are ideally suited for sintering studies of isolated nano-sized cobaltous particles as the graphitic support material does not provide distinct metal-support interaction. Furthermore, the differently sized cobaltous particles in the various model systems render possible studies on structural dependencies of activity, selectivity, and deactivation in cobalt oxide or cobalt catalysed reactions.</p>

scholarly journals Empower to connect and connect to empower: experience in using a humanistic approach to improve patients’ access to, and experience of, care in isolation wards during the COVID-19 outbreak in Singapore

2021 ◽  
Vol 10 (1) ◽  
pp. e000996
Author(s):  
Natalie Liling Woong ◽  
Victoria Sze Min Ekstrom ◽  
Xiaohui Xin ◽  
Crystal Lim ◽  
Evelyn Swee Kim Boon ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Psychosocial Support ◽  
Interprofessional Collaboration ◽  
Quality Improvement Project ◽  
Healthcare Team ◽  
Psychosocial Needs ◽  
Improvement Project ◽  
Support Materials ◽  
Experience Of Care ◽  
Singapore General Hospital

Patients admitted to the isolation ward during the COVID-19 outbreak face multiple psychosocial stressors including the disruptive experience of being in quarantine, anxiety over contracting a newly emerging infectious disease and limited access to their healthcare team. This quality improvement project aims to leverage on technology to improve patients’ access to, and experience of, care while in isolation.Patients admitted to two isolation wards in Singapore General Hospital (SGH) between 28 February and 19 March 2020 were each provided an iPad loaded with the MyCare application (app), curated materials and mobile games. During this period, 83 of them accessed the device and the app. MyCare app is an app developed by the nursing team in SGH as part of an existing interprofessional collaboration to help patients navigate their care during their inpatient stay. In response to COVID-19, MyCare app was supplemented with materials to address affected patients’ informational and psychosocial needs. These materials included an information sheet on COVID-19, interviews with previous severe acute respiratory syndrome survivors, psychosocial support materials, and uplifting literature, illustrated storybooks and artwork.This paper describes the process of planning for, and executing, the intervention and reports the initial results of its effect. Initial feedback indicated a positive response to the intervention. 9 out of 10 respondents (90%) rated their hospital experience with a maximum of five stars and all 10 respondents (100%) rated the psychosocial support materials with five stars. Doctors managing the patients also observed a reduction in the number of commonly asked questions following the deployment of the iPad.This quality improvement project is ongoing with plans for further research to determine how to better support the psychosocial needs of patients in isolation during a novel disease outbreak. This report is written based on the Standards for Quality Improvement Reporting Excellence guidelines.

scholarly journals Sustainable development and enhancement of cracking processes using metallic composites

2021 ◽  
Author(s):  
Abimbola G. Olaremu ◽  
Williams R. Adedoyin ◽  
Odunayo T. Ore ◽  
Adedapo O. Adeola
Keyword(s):  
Crude Oil ◽  
Environmental Sustainability ◽  
Catalytic Cracking ◽  
Environmental Concern ◽  
Sustainable Use ◽  
Comprehensive Overview ◽  
Support Materials ◽  
Catalytic Support ◽  
Structural Improvement ◽  
Metallic Composites

AbstractMetallic composites represent a vital class of materials that has gained increased attention in crude oil processing as well as the production of biofuel from other sources in recent times. Several catalytic materials have been reported in the literature for catalytic cracking, particularly, of crude oil. This review seeks to provide a comprehensive overview of existing and emerging methods/technologies such as metal–organic frameworks (MOFs), metal–matrix composites (MMCs), and catalytic support materials, to bridge information gaps toward sustainable advancement in catalysis for petrochemical processes. There is an increase in industrial and environmental concern emanating from the sulphur levels of oils, hence the need to develop more efficient catalysts in the hydrotreatment (HDS and HDN) processes, and combating the challenge of catalyst poisoning and deactivation; in a bid to improving the overall quality of oils and sustainable use of catalyst. Structural improvement, high thermal stability, enhanced cracking potential, and environmental sustainability represent the various benefits accrued to the use of metallic composites as opposed to conventional catalysts employed in catalytic cracking processes.

scholarly journals A quick and versatile one step metal–organic chemical deposition method for supported Pt and Pt-alloy catalysts

RSC Advances ◽  
2020 ◽  
Vol 10 (34) ◽  
pp. 19982-19996 ◽  
Author(s):  
Colleen Jackson ◽  
Graham T. Smith ◽  
Nobuhle Mpofu ◽  
Jack M. S. Dawson ◽  
Thulile Khoza ◽  
...  
Keyword(s):  
Carbon Nanofiber ◽  
Chemical Deposition ◽  
Organic Chemical ◽  
Nanoparticle Deposition ◽  
Support Materials ◽  
Pt Alloy ◽  
Metal Organic ◽  
One Step ◽  
Chemical Deposition Method ◽  
Alloy Catalysts

A simple, modified Metal–Organic Chemical Deposition (MOCD) method for Pt, PtRu and PtCo nanoparticle deposition onto a variety of support materials, including C, SiC, B4C, LaB6, TiB2, TiN and a ceramic/carbon nanofiber, is described.

scholarly journals Biodegradation of Methyl tert-Butyl Ether and Other Fuel Oxygenates by a New Strain, Mycobacterium austroafricanum IFP 2012

2002 ◽  
Vol 68 (6) ◽  
pp. 2754-2762 ◽  
Author(s):  
Alan François ◽  
Hugues Mathis ◽  
Davy Godefroy ◽  
Pascal Piveteau ◽  
Françoise Fayolle ◽  
...  
Keyword(s):  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Dry Weight ◽  
Butyl Alcohol ◽  
Amyl Alcohol ◽  
Methyl Tert Butyl Ether ◽  
Methylotrophic Bacterium ◽  
Specific Rate ◽  
Butyl Ether ◽  
Mycobacterium Austroafricanum

ABSTRACT A strain that efficiently degraded methyl tert-butyl ether (MTBE) was obtained by initial selection on the recalcitrant compound tert-butyl alcohol (TBA). This strain, a gram-positive methylotrophic bacterium identified as Mycobacterium austroafricanum IFP 2012, was also able to degrade tert-amyl methyl ether and tert-amyl alcohol. Ethyl tert-butyl ether was weakly degraded. tert-Butyl formate and 2-hydroxy isobutyrate (HIBA), two intermediates in the MTBE catabolism pathway, were detected during growth on MTBE. A positive effect of Co2+ during growth of M. austroafricanum IFP 2012 on HIBA was demonstrated. The specific rate of MTBE degradation was 0.6 mmol/h/g (dry weight) of cells, and the biomass yield on MTBE was 0.44 g (dry weight) per g of MTBE. MTBE, TBA, and HIBA degradation activities were induced by MTBE and TBA, and TBA was a good inducer. Involvement of at least one monooxygenase during degradation of MTBE and TBA was shown by (i) the requirement for oxygen, (ii) the production of propylene epoxide from propylene by MTBE- or TBA- grown cells, and (iii) the inhibition of MTBE or TBA degradation and of propylene epoxide production by acetylene. No cytochrome P-450 was detected in MTBE- or TBA-grown cells. Similar protein profiles were obtained after sodium dodecyl sulfate-polyacrylamide gel electrophoresis of crude extracts from MTBE- and TBA-grown cells. Among the polypeptides induced by these substrates, two polypeptides (66 and 27 kDa) exhibited strong similarities with known oxidoreductases.

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