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Improved hydrogen storage properties of MgH_2 catalyzed with K_2niF_6

Journal of Energy Chemistry 2016年第5期25卷 832-839页

作者： n.n.Sulaiman n.juahir n.S.Mustafa F.A.Halim Yap M.Ismail School of Ocean Engineering Universiti Malaysia Terengganu

In this study, the hydrogen storage properties of MgH-X wt% KniF（X = 5, 10, 15, 20, and 50） were investigated for the first time. From the analysis of the onset desorption temperature and isothermal de/absorption kinetics, it was shown that MgH+ 5 wt% KniFsample has the best performance. The 5wt% doped sample started to release hydrogen at about 260 °C, which was a reduction of about 95 °C and 157 oC compared with the as-milled and as-received MgH. In addition, the de/absorption kinetics of the MgH+ 5 wt% KniFwere also improved significantly compared to the un-doped MgH. The apparent activation energy for hydrogen desorption exhibited the decrement from 167.0 k J/mol for as-milled MgHto 111.0 k J/mol with the addition of 5 wt% KniF. Moreover, the X-ray diffraction spectra displayed the formation of new phases of KF, KH, Mgni and MgniHby doping the KniFwith MgHafter the dehydrogenation and rehydrogenation processes. The scanning electron microscope results revealed that MgHdoped with 5 wt% KniFdemonstrated the smallest particle size compared to the as-received and as-milled MgH. It is believed that the formation of in situ active species of KF, KH, and Mgni could provide a synergetic catalytic effect in enhancing the hydrogen sorption properties of MgH.

关键词： Hydrogen storage Solid state storage Magnesium hydride Catalyst

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Isolation,characterization and identification of plant growth-promoting rhizobacteria from the rhizosphere of Acacia mangium at sandy BRIS soil

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Frontiers of Agricultural Science and Engineering 2024年第3期11卷 499-513页

作者： Zakiah MUSTAPHA Radziah OTHMAn nik nurnaeimah nIK MUHAMMAD nASIR Dhiya Dalila ZAWAWI Mohd Khairi CHE LAH Hafizan.juahir School of Agriculture Science and Biotechnology Faculty of Bioresources and Food IndustryUniversiti Sultan Zainal AbidinBesut Campus22200 BesutTerengganuMalaysia Department of Land Management Faculty of AgricultureUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Faculty of Plantation and Agrotechnology Universiti Technologi MARA Cawangan Pahang26400 JengkaPahangMalaysia

This study has isolated,characterized,and identified potential plant growthpromoting rhizobacteria(PGPR)with multiple PGP characteristics(n_(2)-fixation,P-and K-solubilization,IAA,and siderophores production)from the rhizosphere BRIS soil of Acacia mangium.A total of 24 pure colonies were isolated and only 8 colonies were selected for further evaluation of the growth rate in 5%organic molasses medium supplemented with 2%KnO_(3).Based on the biochemical,potential PGP characteristics and growth performance,3 superior PGPR strains were selected and identified as Paraburkholderia unamae(UA1),Bacillus amyloliquefaciens(UA6),and Enterobacter asburiae(UAA2)by partial sequencing of the 16S rRnA *** selected bacterial strains either in single or mixed(UA1+UA6+􀀁UAA2)cultures have shown a significant biochemical estimation of the PGP *** strain has its own PGPR traits superiority with UA1 showing the best PGP characteristic followed by UA6 and *** use of mixed bacterial strains was beneficial as it showed the best performance in n_(2)-fixation,siderophores production,and significant effect on corn phenology,growth and yield compared to using a single *** types of microbes showed potential to be used as biofertilizer and should be exploited more.

关键词： Biofertilizer corn organic molasses medium PGP characteristic phytohormone potassium nitrate siderophores

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