Preparation of Ni/MgOZrO2 nanocrystals by citrate sol–gel method

Trakarnpruk, Wimonrat; Sukkaew, Charnsak

doi:10.1016/j.jallcom.2007.06.018

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…The other 5 wt % M x O y /SMF (where M x O y = MgO, Ga 2 O 3 , Al 2 O 3 , SnO 2 ) supports were synthesized by a citrate sol−gel method. 29 32 g of Mg(NO 3 ) 2 •6H 2 O (Merck), 13.6 g of Ga(NO 3 ) 3 •H 2 O (Strem), 36.75 g of Al(NO 3 ) 3 •9H 2 O (Fluka), or 6.3 g of SnCl 2 (Fluka) were dissolved in 30 cm 3 of distilled water containing a calculated amount of citric acid. The M:citric acid molar ratio was always 1:2.…”

Section: Methodsmentioning

confidence: 99%

Size-Controlled Pd Nanoparticles in 2-Butyne-1,4-diol Hydrogenation: Support Effect and Kinetics Study

et al. 2014

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Structured catalyst has been developed for C−C triple bond three-phase hydrogenation. The sintered metal fiber (SMF) coated by different oxides served as support for monodispersed Pd nanoparticles (6.4 ± 0.5 nm). The effect of acid−base properties and reducibility of metal oxide coating on catalytic performance in the liquid phase (T = 303− 348 K; P = 1−20 bar) hydrogenation of 2-butyne-1,4-diol to 2-butene-1,4-diol (B2) has been studied. The oxides MgO, ZnO, Ga 2 O 3 , Al 2 O 3 , ZrO 2 , SnO 2 , and SiO 2 and the mixtures of MgO + ZnO + Al 2 O 3 , MgO + Al 2 O 3 , and ZnO + Al 2 O 3 were tested. The catalyst activity was higher up to 10-fold for Pd 0 on acidic supports, like SiO 2 , but demonstrated lower selectivity to B2 as compared to the basic oxides. The highest yield (∼99%) of the target B2 and stability over four consecutive runs were attained over the 0.2% Pd 0 /ZnO/SMF catalyst. The high selectivity to B2 was attributed to the formation of an active phase containing intermetallic PdZn alloy as confirmed by XPS. The reaction kinetics was modeled using a Langmuir−Hinshelwood mechanism and found consistent with the experimental data. The developed structured catalyst is suitable for a design of flow multiphase reactors to perform alkyne semihydrogenations in continuous mode.

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Section: Methodsmentioning

confidence: 99%

Size-Controlled Pd Nanoparticles in 2-Butyne-1,4-diol Hydrogenation: Support Effect and Kinetics Study

et al. 2014

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“…A broad absorption band around 3214~3222 cm -1 is the characteristic band of free hydroxyl group (-OH). The bands around 1308~1320 are attributed to the stretching absorption of residual nitrate [18][19].…”

Section: Resultsmentioning

confidence: 99%

The Preparation of Pervoskite Oxide Powders Adopted in ITSOFC via Inductively Coupled Plasma Technique

et al. 2014

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This study is aimed to produce nano-scale and micronscale perovskite oxide powders, such as ionic conductive and mixed conductive powders, to be adopted respectively as solid electrolyte and electrode materials for intermediated temperature solid oxide fuel cells (ITSOFCs). These nano-scale powders will be manufactured via a thermal plasma powder synthesis technique using an inductively coupled plasma (ICP) synthesis system. In the application of fabricating the SOFC membrane electrode assembly (MEA), the use of raw powders with nano-scale sizes can dramatically reduce the sintering temperature and hence the cost of MEA fabrication could be decreased; moreover, the resultant nano-structured electrodes tend to provide more triple phase boundaries (TPB) and reaction sites. Consequently, more facile electrode kinetics can be obtained and the cell performance can be enhanced.

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“…Thus addition of citric acid to multi-component metal nitrates yields a stable transparent gel on dehydration. Hence this process has been used to prepare a variety of multi-component oxide ceramic powders [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%