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- Glasbey, JC, et al.
(författare)
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- 2021
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swepub:Mat__t
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- Fasanya, O. O., et al.
(författare)
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Effects of synthesis methods on performance of CuZn/MCM-41 catalysts in methanol steam reforming
- 2021
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Ingår i: International journal of hydrogen energy. - : Elsevier BV. - 0360-3199 .- 1879-3487. ; 46:5, s. 3539-3553
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Tidskriftsartikel (refereegranskat)abstract
- CuZn-based catalysts are active in production of hydrogen by methanol steam reforming. However, there is a need to have further insight on their physico-chemical properties to improve selectivity to hydrogen. Therefore, a series of CuZn/MCM-41 catalysts was synthesized by four different routes; one pot hydrothermal synthesis (OPMCM), co-impregnation (COMCM), serial impregnation (SRMCM) and copper impregnated on Zn-MCM-41 (ZNMCM). Samples of catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS), inductively coupled plasma (ICP) emission spectrometry, Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). XRD revealed disruption in the ordered pore network typical in MCM-41 for all catalysts synthesized and also showed that the one pot synthesis catalyst had wide spread dispersion of Cu and Zn. SEM micrographs captured irregularly shaped particles of different sizes. While XPS showed that different Cu and Zn species were formed within the catalyst matrix. XPS also confirmed that there was wide spread dispersion and interaction of Cu and Zn with MCM-41 matrix in the OPMCM catalyst. COMCM and OPMCM demonstrated the highest activity with 88 and 65% methanol conversion with corresponding H2 selectivity of 91 and 86% respectively. They are better than SRMCM and ZNMCM which had average H2 selectivity of 19% and 31% respectively. CO selectivity was less than 1.8% for the COMCM and OPMCM catalysts. While SRMCM and ZNMCM had CO selectivity's as high as 8.9% and 7.2% respectively. The data generated shows that catalytic activity is largely affected by the nature of Cu species within the catalyst matrix.
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- Handuleh, Jibril I. M., et al.
(författare)
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Introducing evidence based public health practice through a journal club for public health officers in Somaliland
- 2021
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Ingår i: Somali Health Action Journal. - : Umea University Library. - 2004-1985. ; 1:1
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Tidskriftsartikel (refereegranskat)abstract
- Evidence based public health is one of the basic training tools of public health students and young officers in decision making. The training tools for early career specialists and trainees in public health is journal clubs (JC). It keeps the knowledge of professionals up to date and assist them in receiving information to design, plan, implement health care services, policies and strategies.The intention of the JC team was to raise awareness of methods for public health literature search, appraising it and applying this knowledge in their daily practices. A senior public health practitioner in Somaliland (the corresponding author) invited medical students and residents to have JCs as a part of their training. They did not accept the offer so the organizer invited practicing junior public health professionals instead. The JC team members were a general practitioner and 3 public health workers from Ministry of Health, public hospital physician, public health school and field public health officer. A weekly or twice weekly journal club took place to train them in critical appraisal. This continued for 15 months in a hybrid mentorship for the health care professionals.The team mentor selected a paper for discussion. Mentees choose a study design appraisal tool from the Critical Appraisal Skills Program (CASP) that matched the study to present. In the process of appraisal, a team member led the discussion using the checklist.The mentees presented their critical appraisal either orally or via a presentation. The checklist and paper were compared for assessing the study design and structure of the paper of the week.This approach of empowering junior public health officers in Somalia is a way forward for encouraging the professionals to use evidence based practice in their daily practices. This will improve their selection of research tools and translating the scientific work into their practice and services.
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