Homogeneous precipitation method preparation of modified red mud supported Ni mesoporous catalysts for ammonia decomposition

Cao, Jianliang; Yan, Zhaoli; Deng, Qianqian; Yuan, Zhong‐Yong; Wang, Yan; Sun, Guang; Wang, Xiaodong; Bala, Hari; Zhang, Zhanying

doi:10.1039/c3cy00519d

Cited by 61 publications

(24 citation statements)

References 32 publications

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“…It is noticed that the activity of the Ce0-NiO-SiO 2 -350 catalyst was the lowest with only 75.6% of ammonia decomposed at 650 C. However, all the catalysts modified with CeO 2 exhibit the ammonia conversions over 90% at the reaction temperature of 650 C, showing higher catalytic activity than the Ce-free catalyst. In particular, for the Ce10-NiO-SiO 2 -350 catalyst, ammonia was almost totally conversed with the H 2 formation rate of 33.24 mmol g cat À1 min À1 at the same reaction condition, and this catalytic activity is higher than that of the modified red mud supported Ni mesoporous catalyst [32], and comparable with that of Fe-based catalyst [33] and conventional supported Nibased catalyst [34]. This indicates that the catalytic activity is obviously affected by the quantity of doped CeO 2 , and 10% is an appropriate amount, suggesting the promoting effect of Ce on the catalytic performance of CeX-NiO-SiO 2 -350 in ammonia decomposition.…”

Section: Resultsmentioning

confidence: 70%

Ce-modified Ni nanoparticles encapsulated in SiO2 for CO -free hydrogen production via ammonia decomposition

Zhang

Ren

et al. 2015

International Journal of Hydrogen Energy

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Section: Resultsmentioning

confidence: 70%

Ce-modified Ni nanoparticles encapsulated in SiO2 for CO -free hydrogen production via ammonia decomposition

Zhang

Ren

et al. 2015

International Journal of Hydrogen Energy

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“…RM is a byproduct from aluminum industry. Its main compositions are Al 2 O 3 , SiO 2 , CaO, Fe 2 O 3 , TiO 2 , Na 2 O, and K 2 O, which have been previously described by Cao et al (2014aCao et al ( , 2014b. The powder XRD patterns of RM, ARM, and ARM-200 are shown in Figure 1.…”

Section: Materials and Characterizationmentioning

confidence: 67%

High-surface-area activated red mud for efficient removal of methylene blue from wastewater

Gao

Liu

et al. 2017

Adsorption Science & Technology

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Red mud was activated by a digestion-precipitation method, resulting in a mesostructure with high surface area, and the activated red mud was further used as the adsorbent for methylene blue removal. The physicochemical properties of the resultant samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry analysis, and nitrogen sorption techniques. Batch studies were measured to investigate the influence factors including adsorbent dosage, contact time, pH, and initial concentration. It was revealed that the activated red mud was highly efficient for removal of methylene blue. Adsorption experiments were found to be better achieved in faintly acidic and alkaline conditions, where the adsorption capacity of activated red mud and activated red mud-200 reached 232 and 274 mg/g at pH 7.0, respectively. Langmuir, Freundlich, Temkin isotherms, and pseudo-second-order kinetic model fitted the experimental data well, demonstrating an electrostatic interaction mechanism.

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“…These diffractions peaks could be assigned to the (101), (004), 200), (105), (211), and (204) crystal planes, respectively, of the tetragonal anatase phase (JCPDS Card no. [59,60]. The two diffraction peaks at 2θ angles of 27.4 • and 36.3 • correspond to the spacing of (1 1 0) and (1 0 1), respectively, of the rutile phase (JCPDS Card no.…”

Section: Xrdmentioning

confidence: 99%

“…Here, the rutile content of the TNT was very small compared to the anatase. It is generally known that in the hydrothermal synthesis of TNT, the heat treatment above 800 • C or acid hydrothermal processes lead to the formation of rutile phase [60][61][62]. It is also possible that some of the diffraction peaks of rutile phase TiO 2 may not appear in the XRD pattern because the nanotubes may be formed by the rolling up the two-dimensional sheets of TiO 2 structure [63].…”

Section: Xrdmentioning

confidence: 99%

Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

et al. 2019

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Carbon dioxide (CO2) is considered as the prime reason for the global warming effect and one of the useful ways to transform it into an array of valuable products is through electrochemical reduction of CO2 (ERC). This process requires an efficient electrocatalyst with high faradaic efficiency at low overpotential and enhanced reaction rate. Herein, we report an innovative way of reducing CO2 using copper-metal supported on titanium oxide nanotubes (TNT) electrocatalysts. The TNT support material was synthesized using alkaline hydrothermal process with Degussa (P-25) as a starting material. Copper nanoparticles were anchored on the TNT by homogeneous deposition-precipitation method (HDP) with urea as precipitating agent. The prepared catalysts were tested in a home-made H-cell with 0.5 M NaHCO3 aqueous solution in order to examine their activity for ERC and the optimum copper loading. Continuous gas-phase ERC was carried out in a solid polymer electrolyte (SPE) reactor. The 10% Cu/TNT catalysts were employed in the gas diffusion layer (GDL) on the cathode side with Pt-Ru/C on the anode side. Faradaic efficiencies for the three major products namely methanol, methane, and CO were found to be 4%, 3%, and 10%, respectively at −2.5 V with an overall current density of 120 mA/cm2. The addition of TNT significantly increased the catalytic activity of electrocatalyst for ERC. It is mainly attributed to their better stability towards oxidation, increased CO2 adsorption capacity and stabilization of the reaction intermediate, layered titanates, and larger surface area (400 m2/g) as compared with other support materials. Considering the low cost of TNT, it is anticipated that TNT support electrocatalyst for ECR will gain popularity.

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Homogeneous precipitation method preparation of modified red mud supported Ni mesoporous catalysts for ammonia decomposition

Cited by 61 publications

References 32 publications

Ce-modified Ni nanoparticles encapsulated in SiO2 for CO -free hydrogen production via ammonia decomposition

Ce-modified Ni nanoparticles encapsulated in SiO2 for CO -free hydrogen production via ammonia decomposition

High-surface-area activated red mud for efficient removal of methylene blue from wastewater

Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

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