Effects of acid-treatment of halloysite on the characteristics and catalytic performance of palladated halloysite in lubricants hydrogenation reaction

Asadi, Zahra; Sadjadi, Samahe; Nekoomanesh‐Haghighi, Mehdi; Bahri‐Laleh, Naeimeh

doi:10.1016/j.inoche.2022.109438

Cited by 12 publications

(7 citation statements)

References 37 publications

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“…51,[69][70][71] The acid treatment of HNT is a common strategy used by the materials community that involves the use of strong acids, such as sulfuric acid or nitric acid, to modify the surface of the nanotubes. 64,72,73 This process leads to the removal of impurities and amorphous materials, resulting in the exposure of a higher proportion of the tubular structure, by etching the inner alumina layer (and in a minor percentage the silica layer) and thus enhancing the material's ability to interact with the metal catalyst. The acid treatment process also affects the porosity and active sites on the surface of the HNT, making it more accessible for reactant molecules to interact with the substrate.…”

Section: Resultsmentioning

confidence: 99%

Assessing the effect of acid and alkali treatment on a halloysite-based catalyst for dry reforming of methane

Abotaleb,

Al-Masri,

Alkhateb

et al. 2024

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Assessing the effect of acid and alkali treatment on a halloysite-based catalyst for dry reforming of methane

Abotaleb,

Al-Masri,

Alkhateb

et al. 2024

RSC Adv.

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“…Our research group has disclosed synthetic procedure of PAO through 1-decene oligomerization previously. [13] According to that procedure, oligomerization was performed in a stainless steel reactor, which was purged with N 2 for 15 min at 80 °C prior to use. The reactor was fed with AlCl 3 (5 g) and 1-decene (100 g) and then the mixture was stirred for an hour at 80 °C.…”

Section: Synthesis Of Paomentioning

confidence: 99%

The mono and bimetallic catalysts for hydrogenation of PAO lubricants

Asadi,

Sadjadi,

Bahri‐Laleh

et al. 2023

ChemistrySelect

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Using halloysite as a natural support and palladium and rhodium salts, one bimetallic and two monometallic catalysts were prepared through wet‐impregnation method. The catalysts were characterized via TGA, XRD, FTIR, EDS and elemental mapping analyses and their activity for hydrogenation of poly‐alpha‐olefin oil was examined and compared. The results indicated that among the three catalysts, halloysite supported Pd nanoparticles and bimetallic halloysite supported Pd−Rh catalyst exhibited the highest and lowest activity, respectively. To clarify the origin of the observed difference in the activity of the catalyst, they have been further characterized via ICP and TEM analyses. The result indicated that the nature of the metallic species affected the loading and dispersion of the formed metallic nanoparticles. In the case of halloysite supported Pd nanoparticles, while metal loading was the highest, the formed particles were fine and well‐dispersed. It is whilst that in the case of bimetallic catalyst aggregation of particles was observed which was correlated to its lower efficiency. Optimization of the reaction variables via response surface methodology was also conducted using Pd/HNT catalyst. It was shown that using 5 wt.% catalyst at 130 °C under H2 gas with pressure of 8 bar, hydrogenation led to 97 % yield in 7 h. The catalyst was also reusable for 6 consecutive runs with negligible loss of activity.

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“…In addition, the modified halloysite had more potential as the support. Asadi et al 9 designed catalysts supported by halloysites for the hydrogenation of polyalphaolefins. The halloysite was etched with acid which expanded the specific surface area of HNTs.…”

Section: ■ Introductionmentioning

confidence: 99%

Effect of Mo Addition on the Performance of Ni-Based Methanation Catalysts Supported by Halloysites

Meng

Xin

et al. 2023

Ind. Eng. Chem. Res.

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Ni-based halloysite methanation catalysts with various Mo contents were prepared by using halloysites as supports, and it was used to catalyze the methanation reaction. The addition of Mo can strengthen the interaction between Ni and the halloysite, preventing the active component Ni from aggregating into the larger particles during the reaction, which can improve the catalyst activity and life. At the same time, the electron donation of the Mo atom can rise the electron density around the nickel atom and facilitate the dissociation of carbon monoxide on the Ni surface, which can improve the activity of the reaction under low temperature. Among them, the 6Mo10Ni/eHNTs catalyst has the best activity at 350 °C. The conversion of CO achieves 100% and the yield of CH 4 reaches 99.7%. At 300 °C, the CO conversion rate is 100%, and the CH 4 yield is 97%, which is the same as the activity of 10Ni/eHNTs without Mo at 350 °C, i.e., the low temperature activity is improved with the addition of Mo. At the same time, the addition of Mo enhances the anti-sintering property and resistance to the carbon deposition of the catalysts. This work shows the possibility for the industrial application of the methanation catalyst using halloysites as the support.

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Effects of acid-treatment of halloysite on the characteristics and catalytic performance of palladated halloysite in lubricants hydrogenation reaction

Cited by 12 publications

References 37 publications

Assessing the effect of acid and alkali treatment on a halloysite-based catalyst for dry reforming of methane

Assessing the effect of acid and alkali treatment on a halloysite-based catalyst for dry reforming of methane

The mono and bimetallic catalysts for hydrogenation of PAO lubricants

Effect of Mo Addition on the Performance of Ni-Based Methanation Catalysts Supported by Halloysites

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