The hydroxyapatite nanotube as a promoter to optimize the HDS reaction of NiMo/TiO2 catalyst

Wang, Huaiyuan; Wang, Chijia; Xiao, Bo; Zhao, Li; Zhang, Jian; Zhu, Yanji; Guo, Xuefeng

doi:10.1016/j.cattod.2015.06.005

Cited by 16 publications

(5 citation statements)

References 35 publications

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“…As mentioned earlier, the research directed to modulate the metal-support interaction can be envisaged from many viewpoints, such as the use of crystallographic phases different from the typical gamma alumina [38] or supporting the active phases over unconventional single metal (Ms) oxides such as those based on Ti [26,[39][40][41][42][43][44][45], Zr [26,[41][42][43][44]46,47], Si [23,26,[48][49][50] or Ga [51]. Nevertheless, more recently to gain advantage from the individual single metal oxide properties and to overcome their intrinsic limitations, several binary mixed oxide materials such as Al2O3-Ga2O3 [50], Al2O3-TiO2 [4,52-57], ZrO2-TiO2 [35,58,59], Al2O3-ZrO2 [60][61][62], MgO-TiO2 [63], Al2O3-MgO [56,64], Mn-Al2O3 [65][66][67], and Al2O3-zeolite [68] have been studied, among several others that have been tested to prepare HDS catalysts.…”

Section: Mixed Oxides Support: a Different Approachmentioning

confidence: 99%

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

et al. 2019

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The literature from the past few years dealing with hydrodesulfurization catalysts to deeply remove the sulfur-containing compounds in fuels is reviewed in this communication. We focus on the typical transition metal sulfides (TMS) Ni/Co-promoted Mo, W-based bi- and tri-metallic catalysts for selective removal of sulfur from typical refractory compounds. This review is separated into three very specific topics of the catalysts to produce ultra-low sulfur diesel. The first issue is the supported catalysts; the second, the self-supported or unsupported catalysts and finally, a brief discussion about the theoretical studies. We also inspect some details about the effect of support, the use of organic and inorganic additives and aspects related to the preparation of unsupported catalysts. We discuss some hot topics and details of the unsupported catalyst preparation that could influence the sulfur removal capacity of specific systems. Parameters such as surface acidity, dispersion, morphological changes of the active phases, and the promotion effect are the common factors discussed in the vast majority of present-day research. We conclude from this review that hydrodesulfurization performance of TMS catalysts supported or unsupported may be improved by using new methodologies, both experimental and theoretical, to fulfill the societal needs of ultra-low sulfur fuels, which more stringent future regulations will require.

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Section: Mixed Oxides Support: a Different Approachmentioning

confidence: 99%

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

et al. 2019

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“…The peak at 1165 cm −1 is ascribed to the scissoring motion of P=O. The band at 1365 cm −1 is associated with the methyl group and the band at 1637 cm −1 is ascribed to C-H stretching [24]. Compared with the spectrum of OTiO 2 (w), the FTIR spectrum of ETiO 2 (w) powder displays a sharper peak of greater intensity at 3430 cm −1 due to the presence of hydroxyl groups in EDTMPA.…”

Section: Resultsmentioning

confidence: 97%

Anti-Corrosive and Scale Inhibiting Polymer-Based Functional Coating with Internal and External Regulation of TiO2 Whiskers

Wang

et al. 2018

Coatings

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Abstract:A novel multi-functional carrier of mesoporous titanium dioxide whiskers (TiO 2 (w)) modified by ethylenediamine tetra (methylene phosphonic acid) (EDTMPA) and imidazoline was devised in epoxy coating to improve the anti-corrosion and scale inhibition properties of metal surface. Rigorous characterization using analytical techniques showed that a mesoporous structure was developed on the TiO 2 (w). EDTMPA and imidazoline were successfully grafted on the outer and inner surfaces of mesoporous TiO 2 (w) to synthesize iETiO 2 (w). The results demonstrated that the corrosion resistance of the final iETiO 2 (w) epoxy coating is 40 times higher than that of the conventional unmodified OTiO 2 (w) epoxy coating. The enhanced corrosion resistance of the iETiO 2 (w) functional coating is due to the chelation of the scaling cations by EDTMPA and electron sharing between imidazoline and Fe. Scale formation on the iETiO 2 (w) coating is 35 times lower than that on the unmodified OTiO 2 (w) epoxy coating. In addition, EDTMPA and imidazoline act synergistically in promoting the barrier property of mesoporous TiO 2 (w) in epoxy coating. It is believed that this novel, simple, and inexpensive route for fabricating functional surface protective coatings on various metallic materials will have a wide range of practical applications.

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“…34) Ammonia decomposition, being an endothermic reaction, often takes place at above 673 K. Hence, it is estimated that free radicals are generated under this reaction temperature and it is expected that the free radicals of HAp which are generated during the reaction can contribute to the electron donation to the active species. In addition, it has been proposed by Wang et al that the HAp nanotube provides the TiO 2 -based catalyst with electron and promotes the hydrodesulfurization reaction at 553 K. 35) However, to the best of our knowledge, there is no report on the application of HAp as a promoter to a catalyst for ammonia decomposition, in spite of its unique characteristics. Here, the effects of the addition of calcium phosphate (i.e., HAp) to CoMo-based catalysts on their catalytic activities were investigated.…”

Section: ¹mentioning

confidence: 99%

The effects of the addition of calcium phosphate on catalytic activities for ammonia decomposition on CoMo-based catalysts

Ehiro

Katagiri

Yamaguchi

et al. 2019

J. Ceram. Soc. Japan

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In this study, wet impregnation method and solgel technique were used to prepare CoMo-based catalysts supported on two types of porous silicas containing calcium phosphate. The prepared catalysts were characterized using various techniques, such as N 2 adsorptiondesorption measurement, scanning electron microscope, X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), differential thermal analysis, and X-ray photoelectron spectroscopy. The catalysts were tested for ammonia decomposition to produce CO x-free hydrogen. The results of the XRD and FT-IR measurements elucidated that the crystal structure of calcium phosphate on the silica supports was attributed to calcium hydroxyapatite (HAp). The addition of calcium phosphate changed the porous structures of the catalysts, and decreased their BET surface areas and total pore volumes. Furthermore, the catalytic activity of the CoMo-based catalysts was influenced by the amount of calcium phosphate added. It was observed that the ammonia conversion at 873 K was increased by a maximum of 12.6% when 0.5 wt% of calcium phosphate was added to the catalyst, while a further addition of calcium phosphate beyond 1.0 wt% inhibited the ammonia conversion. From this study, it was concluded that HAp could work as a promoter for ammonia decomposition.

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The hydroxyapatite nanotube as a promoter to optimize the HDS reaction of NiMo/TiO2 catalyst

Cited by 16 publications

References 35 publications

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

Recent Insights in Transition Metal Sulfide Hydrodesulfurization Catalysts for the Production of Ultra Low Sulfur Diesel: A Short Review

Anti-Corrosive and Scale Inhibiting Polymer-Based Functional Coating with Internal and External Regulation of TiO2 Whiskers

The effects of the addition of calcium phosphate on catalytic activities for ammonia decomposition on CoMo-based catalysts

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