A study on the preparation of supported metal oxide catalysts using JRC-reference catalysts. I. Preparation of a molybdena–alumina catalyst. Part 3. Drying process

Okamoto, Yasuaki; Umeno, Satoshi; Arima, Yusaku; Nakai, Kenta; Takahashi, Tetsuo; Uchikawa, Kei; Inamura, Kentaro; Akai, Yoshio; Chiyoda, Osamu; Katada, Naonobu; Shishido, Tetsuya; Hattori, Hideshi; Hasegawa, Sadao; Yoshida, Hisao; Segawa, Kohichi; Koizumi, Naoto; Yamada, Masahito; Nishijima, Akio; Kabe, Toshiaki; Ishihara, Atsushi; Isoda, Takaaki; Mochida, Isao; Matsumoto, Hideyuki; Niwa, Miki; Uchijima, Toshio

doi:10.1016/s0926-860x(98)00066-0

Cited by 20 publications

(2 citation statements)

References 40 publications

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“…Pore volume impregnation of support bodies is carried with a solution containing a metal precursor, followed by aging and drying. Over the years, models have been developed to describe the physicochemical processes that take place during the preparation of supported catalyst bodies, − but in all cases characterization was carried out after drying and/or calcination. Spectroscopic studies that focus on the interaction between metal precursors and the support have generally been carried out on powder supports. − …”

Section: Introductionmentioning

confidence: 99%

Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al₂O₃ Extrudates

et al. 2004

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Raman microscopy has been applied to study the preparation of shaped Mo/Al2O3 catalysts. The speciation of different Mo complexes over γ-Al2O3 support bodies was followed in time after pore volume impregnation with aqueous solutions containing different Mo complexes. The addition of NO3 -to the impregnation solutions allows for a quantitative Raman analysis of the distribution of different complexes over the catalyst bodies as this ion can be used as an internal standard. After impregnation with an acidic ammonium heptamolybdate (AHM) solution, the strong interaction between Mo7O24 6-and Al2O3 results in slow transport of this complex through the support and extensive formation of Al(OH)6Mo6O18 3-near the outer surface of the support bodies. This may be prevented by decreasing the interaction between Mo and Al2O3. In this way, transport is facilitated and a homogeneous distribution of Mo is obtained on a reasonable time scale. A decrease in interaction between Mo and Al2O3 can be achieved by using alkaline impregnation solutions or by the addition of complexing agents, such as citrate and phosphate, to the impregnation solution. In general, time-resolved in situ Raman microscopy can be a valuable tool to study the physicochemical processes during the preparation of supported catalysts.

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Section: Introductionmentioning

confidence: 99%

Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al₂O₃ Extrudates

et al. 2004

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“…Therefore, the appearance of peaks at 2θ angles of 23.5° and 12.8° indicates the presence of MoO3 oxide (Zhu et al, 2013). The emergence of these characteristic MoO3 peaks can be attributed to the high concentration of added Mo metal (13 %wt) and its uneven dispersion on the surface of bentonite (Okamoto et al, 1998). The appearance of MoO3 oxide peaks makes it challenging to form active phases after the catalyst undergoes sulfidation (Ulfah & Subagjo, 2012).…”

Section: Characterization Resultsmentioning

confidence: 99%

Performance of sulfided NiMo catalyst supported on pillared bentonite Al and Ti under hydrodeoxygenation reaction of guaiacol

Rinaldi,

Sari,

Sumari

et al. 2024

Int. J. Renew. Energy Dev.

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Bio-crude oil is known to be sustainable, eco-environmentally, and an alternative energy source produced by biomass pyrolysis. However, its quality remains relatively low due to a higher oxygen concentration compared to liquid fuels from fossils. Therefore, an upgrading process is necessary through the catalytic hydrodeoxygenation (HDO) process. This work synthesized pillared bentonite using Al and Ti metals as the pillaring agent to produce Al-PILC and Ti-PILC as catalyst support for sulfided NiMo. Their catalytic activity in HDO reaction using guaiacol as a model compound of bio-crude oil were also evaluated. Characterization of the bentonite-pillared materials, including Al-PILC, Mo/Al-PILC, NiMo/Al-PILC, Ti-PILC, Mo/Ti-PILC, and NiMo/Ti-PILC, was performed using Surface Area Analyzer, X-ray Diffractometer (XRD), Temperature-Programmed Desorption of ammonia (NH3-TPD), X-Ray Fluorescence (XRF), and Scanning Electron Microscope (SEM) techniques. The characterization results confirm the pillarization process of bentonite using Al and Ti metals as the pillaring agent, and the preparation of the NiMo catalyst using the stepwise impregnation method was successfully prepared. The NiMo/Ti-PILC catalyst performs a superior conversion value on the HDO guaiacol reaction than other catalysts. A well dispersion of Mo and Ni metals on the surface support (NiMo/Ti-PILC), thus creating numerous active sites of the catalyst after the sulfidation. Variations in time and temperature during the HDO guaiacol reaction significantly affected the conversion.

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Hydrotreating Catalysts

Eijsbouts¹

2009

Synthesis of Solid Catalysts

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A study on the preparation of supported metal oxide catalysts using JRC-reference catalysts. I. Preparation of a molybdena–alumina catalyst. Part 3. Drying process

Cited by 20 publications

References 40 publications

Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al₂O₃ Extrudates

Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al₂O₃ Extrudates

Performance of sulfided NiMo catalyst supported on pillared bentonite Al and Ti under hydrodeoxygenation reaction of guaiacol

Hydrotreating Catalysts

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A study on the preparation of supported metal oxide catalysts using JRC-reference catalysts. I. Preparation of a molybdena–alumina catalyst. Part 3. Drying process

Cited by 20 publications

References 40 publications

Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al2O3 Extrudates

Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al2O3 Extrudates

Performance of sulfided NiMo catalyst supported on pillared bentonite Al and Ti under hydrodeoxygenation reaction of guaiacol

Hydrotreating Catalysts

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Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al₂O₃ Extrudates

Envisaging the Physicochemical Processes during the Preparation of Supported Catalysts: Raman Microscopy on the Impregnation of Mo onto Al₂O₃ Extrudates