Bimetallic (Pt-Ni) La-hexaaluminate catalysts obtained from aluminum saline slags for the dry reforming of methane

Torrez-Herrera, J.J.; Korili, S.A.; Gil, A.

doi:10.1016/j.cej.2021.133191

Cited by 19 publications

(4 citation statements)

References 81 publications

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“…Such results indicated that the presence of Rh could facilitate the reduction of Ni. Similar results were also reported for bimetallic catalysts composite of noble metal and transition metal such as Pd–Cu and Pt–Ni. , The improved reducibility of transition metal was mainly attributed to the high H 2 activation property of noble metal and the close interaction between noble metal and transition metal by formation of alloy (where is H 2 spillover effect). , On the contrary, the peak attributed to the reduction of uniformly dispersed Rh 2 O 3 in Ni–Rh(50)/γ-Al 2 O 3 and Ni–Rh(200)/γ-Al 2 O 3 shifted toward higher temperature with respect to Rh/γ-Al 2 O 3 , implying a more intimate contact between the Ni and Rh at higher Ni/Rh molar ratio. , Meanwhile, the reduction peak corresponded to bulk crystalline Rh 2 O 3 was hardly observed, likely due to the well dispersed of Rh diluted by Ni. Furthermore, the total H 2 consumption from TPR results are exhibited in Table .…”

Section: Resultssupporting

confidence: 77%

“…Similar results were also reported for bimetallic catalysts composite of noble metal and transition metal such as Pd−Cu and Pt−Ni. 21,22 The improved reducibility of transition metal was mainly attributed to the high H 2 activation property of noble metal and the close interaction between noble metal and transition metal by formation of alloy (where is H 2 spillover effect). 23,24 On the contrary, the peak attributed to the reduction of uniformly dispersed Rh Furthermore, the total H 2 consumption from TPR results are exhibited in Table 1.…”

Section: ■ Introductionmentioning

confidence: 99%

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Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al₂O₃

Ning

Wang

Zhou

et al. 2023

ACS Appl. Nano Mater.

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Ni catalysts decorated with trace Rh supported on γ-Al 2 O 3 were prepared by the co-impregnation method. To obtain the Ni−Rh nanoparticles with different nanostructures and chemical compositions, bimetallic catalysts with varied Ni/Rh molar ratios were prepared. For comparison, monometallic Ni/γ-Al 2 O 3 and Rh/γ-Al 2 O 3 catalysts were also prepared by the impregnation method. The selective gas phase catalytic hydrodechlorination of 1,2-dichloroethane to ethylene was used to evaluate catalytic performances of the catalysts. The catalysts were characterized by X-ray diffraction, N 2 adsorption, X-ray photoelectron spectroscopy, H 2 temperatureprogrammed reduction, transmission electron microscopy−energy-dispersive X-ray, and CO chemisorption. It was found that the introduction of Rh to Ni catalyst facilitated the generation of spillover hydrogen which could enhance the ability of the Ni catalyst for H 2 activation. In bimetallic catalysts, there was an intimate interaction between Ni and Rh, and isolated Rh sites were formed due to the dilution effect of Ni. Accordingly, compared with the monometallic Ni catalyst for gas phase catalytic hydrodechlorination of 1,2-dichloroethane, the bimetallic Ni−Rh(800)/γ-Al 2 O 3 catalyst exhibited markedly higher 1,2-dichloroethane conversion (37%) and comparable selectivity to ethylene (95%). The findings in this study indicate that Ni−Rh/γ-Al 2 O 3 with trace Rh can be used as a promising catalyst for highly effective and selective catalytic hydrodechlorination of chlorinated hydrocarbons.

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Section: Resultssupporting

confidence: 77%

Section: ■ Introductionmentioning

confidence: 99%

Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al₂O₃

Ning

Wang

Zhou

et al. 2023

ACS Appl. Nano Mater.

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“…Moreover, it has been reported that the addition of noble metals to Ni catalysts can promote the reducibility of Ni, stabilize its degree of reduction during the catalytic process, and stabilize it against sintering. , Adding a small amount of Pt to Ni-based catalysts can increase the activity and stability of the catalysts for DRM, and Pt can improve the metal dispersion on the support and reducibility of Ni species due to due to the spillover effect of H 2 and CO. − , On the other hand, Pt-based catalysts are often required to work at relatively high temperatures . However, nanoparticle catalysts are apt to aggregate (sintering) to minimize their surface energy under such conditions, resulting in the heavy loss of catalytic active centers and serious catalytic degradation and even inactivation. , Therefore, bimetallic Ni–Pt catalysts have been widely studied. − …”

Section: Ni-noble Metalsmentioning

confidence: 99%

Optimization of Ni-Based Catalysts for Dry Reforming of Methane via Alloy Design: A Review

Huang

Tian

et al. 2022

Energy Fuels

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The dry reforming of methane (DRM) reaction, which converts two greenhouse gases, CO 2 and CH 4 , into valuable syngas, offers a promising route to carbon sequestration. Nibased catalysts have been widely used for DRM due to the high activity, low cost, and high feasibility. Nevertheless, the rapid deactivation of Ni-based catalysts caused by carbon deposition and/or active metal sintering is the main drawback for large-scale application. In addition, its high energy demand poses additional difficulties due to the heat-absorbing nature of the reaction. The design of bimetallic alloy catalysts has been considered as an effective strategy to improve the activity and stability of Ni-based catalysts. This paper reviews recent advances in Ni-based bimetallic catalysts for DRM processes, which mainly focus on the synergistic effects of the two elements, the role of the second metal, and the reaction mechanism induced by different active species. Finally, the outlook for the development of high-performance catalysts for DRM is proposed. The discussions in the present work may provide helpful information to researchers in the CO 2 conversion fields to optimize catalyst design.

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“…Concerning the non-metallic product (cake) obtained from salt leaching, its possible use in the construction industry was discussed [8,9,17,28,32]. Recent studies have focused on the process of extracting the aluminum content from the nonmetallic cake by acid or alkaline treatments and the use of the as-obtained aluminum solutions to prepare different kinds of materials, such as hydrocalumites, aluminates and hydrotalcites [1,[33][34][35]. Nevertheless, these studies were performed at lab scale and, as a result of these processes, another new cake is generated that must also be treated.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Management of Salt Slag

et al. 2022

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The management of salt slag, a waste from the secondary aluminum industry, is associated with huge environmental concerns due to the risk of atmospheric pollution (emission of toxic gases), groundwater contamination (high salt content that can percolate and cause an increase in salinity) and soil unavailability (large extensions required for disposal). Therefore, the development of a sustainable process for its treatment and recovery is of the utmost importance. In this work, a two-step process for the valorization of salt slag was developed that rendered zeolite as the main added-value product and NaCl and NH3 as byproducts. First, salt slag was hydrolyzed at 90 °C and at a solid/water ratio of 1/3. More than 90% of salt and ~90% of ammonia were recovered. In a second step, the hydrolyzed slag was completely transformed into a NaP zeolite under mild hydrothermal conditions. The zeolite exhibited specific surface area (17 m2 g−1), cation exchange capacity (2.12 meq g−1) and zeta potential (−52 mV) values that represent good characteristics for use in the removal of metal ions from aqueous effluents. The transformation of salt slag into zeolite can be considered a sustainable process with a high contribution to the circular economy.

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Bimetallic (Pt-Ni) La-hexaaluminate catalysts obtained from aluminum saline slags for the dry reforming of methane

Cited by 19 publications

References 81 publications

Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al₂O₃

Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al₂O₃

Optimization of Ni-Based Catalysts for Dry Reforming of Methane via Alloy Design: A Review

Sustainable Management of Salt Slag

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Bimetallic (Pt-Ni) La-hexaaluminate catalysts obtained from aluminum saline slags for the dry reforming of methane

Cited by 19 publications

References 81 publications

Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al2O3

Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al2O3

Optimization of Ni-Based Catalysts for Dry Reforming of Methane via Alloy Design: A Review

Sustainable Management of Salt Slag

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Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al₂O₃

Selective Catalytic Hydrodechlorination of 1,2-Dichloroethane to Ethylene over Ni–Rh Nanoparticle Catalysts Supported on γ-Al₂O₃