Ce-promoted highly active bifunctional Pd/Al2O3 catalyst for reversible catalytic hydrogenation and dehydrogenation of N-propylcarbazole

Li, Chenggen; Zhang, Qingyang; Xu, Zhihai; Liu, Li; Zhu, Ting; Chen, Zhiwen; Dong, Yuan; Yang, Ming

doi:10.1016/j.ijhydene.2022.09.212

Cited by 15 publications

(5 citation statements)

References 51 publications

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“…The dehydrogenation of perhydro 2-(n-methylbenzyl) pyridine was studied using a mesoporous catalyst Pd on Al 2 O 3 prepared by the solvent deficient precipitation method [47,74]. The nanoparticles of Pd were composed of the Pd(111) plane which released hydrogen at a low rate in the primary stage, since the rate of diffusion was limited due to the pellet structure of the catalyst.…”

Section: Pyridine Derivativementioning

confidence: 99%

Development of Liquid Organic Hydrogen Carriers for Hydrogen Storage and Transport

Le,

Tran,

Lee

2024

IJMS

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The storage and transfer of energy require a safe technology to mitigate the global environmental issues resulting from the massive application of fossil fuels. Fuel cells have used hydrogen as a clean and efficient energy source. Nevertheless, the storage and transport of hydrogen have presented longstanding problems. Recently, liquid organic hydrogen carriers (LOHCs) have emerged as a solution to these issues. The hydrogen storage technique in LOHCs is more attractive than those of conventional energy storage systems like liquefaction, compression at high pressure, and methods of adsorption and absorption. The release and acceptance of hydrogen should be reversible by LOHC molecules following favourable reaction kinetics. LOHCs comprise liquid and semi-liquid organic compounds that are hydrogenated to store hydrogen. These hydrogenated molecules are stored and transported and finally dehydrogenated to release the required hydrogen for supplying energy. Hydrogenation and dehydrogenation are conducted catalytically for multiple cycles. This review elaborates on the characteristics of different LOHC molecules, based on their efficacy as energy generators. Additionally, different catalysts used for both hydrogenation and dehydrogenation are discussed.

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Section: Pyridine Derivativementioning

confidence: 99%

Development of Liquid Organic Hydrogen Carriers for Hydrogen Storage and Transport

Le,

Tran,

Lee

2024

IJMS

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“…In addition to the use of carriers with special properties, adding promotive substances to the original catalyst is also an effective method to prepare efficient and bifunctional catalysts. Li et al [ 192 ] used Ce metal to promote a Pd/Al 2 O 3 catalyst. They synthesized a CeO 2 -Al 2 O 3 composite carrier with a different CeO 2 content via a coprecipitation method and prepared Pd/CeO 2 -Al 2 O 3 catalysts.…”

Section: Bifunctional Catalysts Of Lohcsmentioning

confidence: 99%

“…In addition to the use of carriers with special properties, adding promotive substances to the original catalyst is also an effective method to prepare efficient and bifunctional catalysts. Li et al [192] The order of hydrogenation and dehydrogenation catalytic activity of several noble metals is different. For the hydrogenation reaction of LOHCs, Ru has good catalytic activity, while Pd and Pt have good dehydrogenation catalytic activity.…”

Section: Bifunctional Catalysts Of Lohcsmentioning

confidence: 99%

Heterogeneous Catalysts in N-Heterocycles and Aromatics as Liquid Organic Hydrogen Carriers (LOHCs): History, Present Status and Future

et al. 2023

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The continuous decline of traditional fossil energy has cast the shadow of an energy crisis on human society. Hydrogen generated from renewable energy sources is considered as a promising energy carrier, which can effectively promote the energy transformation of traditional high-carbon fossil energy to low-carbon clean energy. Hydrogen storage technology plays a key role in realizing the application of hydrogen energy and liquid organic hydrogen carrier technology, with many advantages such as storing hydrogen efficiently and reversibly. High-performance and low-cost catalysts are the key to the large-scale application of liquid organic hydrogen carrier technology. In the past few decades, the catalyst field of organic liquid hydrogen carriers has continued to develop and has achieved some breakthroughs. In this review, we summarized recent significant progress in this field and discussed the optimization strategies of catalyst performance, including the properties of support and active metals, metal–support interaction and the combination and proportion of multi-metals. Moreover, the catalytic mechanism and future development direction were also discussed.

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“…Crabtree et al , also calculated a series of thermodynamic data for N-heterocycles and found that introducing N atoms into the ring can effectively lower the hydrogen release temperature. In this class of novel heterocyclic molecules, carbazole-based molecules, such as N -ethylcarbazole − and N -propylcarbazole, − are the earliest new LOHCs that can completely realize hydrogenation and dehydrogenation below 200 °C. The hydrogenation and dehydrogenation processes of carbazole-based molecules have been widely studied over different catalysts. , Subsequently, quinoline − and indole molecules have also been developed as new LOHCs.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Feasibility of 2,5-Dimethylindole as a Liquid Organic Hydrogen Carrier: A Combined Theoretical and Experimental Investigation

Liu,

Zhu,

et al. 2023

ACS Sustainable Chem. Eng.

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We present 2,5-dimethylindole (2,5-DMID) as a novel and promising liquid organic carrier (LOHC) for hydrogen storage. A systematic study combined experiments with calculations was conducted on the hydrogen storage properties of 2,5-DMID. Hydrogenation reactions catalyzed by 5 wt % Ru/Al2O3 catalyst under 120–160 °C at 5 MPa H2 pressure and 120 °C at 3–6 MPa H2 pressure indicate that the reaction rate is temperature-dependent and weakly impacted by hydrogen pressure. Full hydrogenation was achieved within 80 min at 150 °C and 5 MPa. Two intermediates, 2H-2,5-DMID and 4H-2,5-DMID, were detected. Conversion from 2,5-DMID to 2H-2,5-DMID was readily achieved at all temperatures with an apparent activation energy of 81.58 kJ/mol H2. Complete dehydrogenation of 8H-2,5-DMID was achieved at 170–210 °C for 180 min on a 5 wt % Pd/Al2O3 catalyst, generating high purity hydrogen gas up to 99.99%. Five cycles of hydrogenation and dehydrogenation processes confirmed the full achievement of both processes with no significant side reactions observed. Density functional theory calculations of the optimal adsorption sites and corresponding reaction energies of 2,5-dimethylindole and intermediates on the catalyst surface perfectly aligned with experimental reactions. This study expands the LOHC family of nitrogen heterocyclic molecules.

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Ce-promoted highly active bifunctional Pd/Al2O3 catalyst for reversible catalytic hydrogenation and dehydrogenation of N-propylcarbazole

Cited by 15 publications

References 51 publications

Development of Liquid Organic Hydrogen Carriers for Hydrogen Storage and Transport

Development of Liquid Organic Hydrogen Carriers for Hydrogen Storage and Transport

Heterogeneous Catalysts in N-Heterocycles and Aromatics as Liquid Organic Hydrogen Carriers (LOHCs): History, Present Status and Future

Exploring the Feasibility of 2,5-Dimethylindole as a Liquid Organic Hydrogen Carrier: A Combined Theoretical and Experimental Investigation

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