Spherical Sandwich Pt/Au@Pd@UIO-67@UIO-N (N = 66, 67, 69) Core–Shell Catalysts: Zr-Based Metal–Organic Framework Effectively Regulating the Reverse Water–Gas Shift Reaction

Xu, Heng; Luo, Xikuo; Wang, Jiajia; Su, Yuqun; Li, Yansong; Xu, Zhikun

doi:10.2139/ssrn.3257349

Cited by 3 publications

(3 citation statements)

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“…The SAPO-34@UIO-n (n = 66, 66-NH 2 , and 67) core−shell samples were prepared in ethanol−dimethylformamide (EtOH−DMF) solvents according to our previous studies. 4,6 The precursor concentration (i.e., ZrCl 4 in EtOH and H 2 BDC in DMF) played a vital role in the morphology of the SAPO-34@UIO-66 sample. The UIO-66 was not a UIO-66 membrane on the SAPO-34 surface but small particles (Figure S5) when the precursor concentration was 2.7 mM (with a DMF/EtOH volume ratio of 1:1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Converting CO₂ Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

et al. 2022

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In the industry, designing synergetic functional nanocatalysts is a desirable strategy to achieve both high activity and selectivity for CO2 hydrogenation. Herein, we fabricate the bicomponent tandem catalysts ZnZrO x /SAPO-34@UIO-n (n = 66, 66-NH2, and 67) to catalyze CO2 conversion into light olefins. Monodispersed SAPO-34 zeolites are used as the core for the growth of the UIO-n shell to obtain its membrane-encapsulated nanocrystal, SAPO-34@UIO-n, which is mixed by grinding with ZnZrO x to obtain the ZnZrO x /SAPO-34@UIO-n catalyst. CO2 hydrogenation yielded highly selective C2–C4 olefins (80%) for the catalyst ZnZrO x /SAPO-34@UIO-66, whereas 57% C2–C4 paraffins were obtained for the catalyst ZnZrO x /SAPO-34 without a UIO-n membrane. The stable UIO-n membrane in the bifunctional catalyst ZnZrO x /SAPO-34@UIO-n adjusted the conversion of CO2 hydrogenation products from paraffins to olefins.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Converting CO₂ Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

et al. 2022

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“…This result is attributed to the excess of Pd NPs loading, which reduces the number of active sites; in addition, if there are too many metal NPs, they are more susceptible to migration and agglomeration at elevated temperature, which reduces the catalytic efficiency. 10 The catalyst HZSM-5@UIO-66-NH 2 /Pd 5.0 used for CO 2 hydrogenation was studied. At 2 MPa and 320 °C, the CO 2 conversion for HZSM-5@UIO-66-NH 2 /Pd 5.0 was 17.1%.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Metal–Organic Framework-Membranized Bicomponent Core–Shell Catalyst HZSM-5@UIO-66-NH₂/Pd for CO₂ Selective Conversion

Pan

Zhao

et al. 2019

ACS Sustainable Chem. Eng.

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In this study, a Zr-based metal–organic framework (MOF)-membranized bicomponent core–shell catalyst HZSM-5@UIO-66-NH2/Pd was produced. Monodispersed HZSM-5 zeolites acted as the core for the epitaxial growth of the UIO-66-NH2 shell to obtain MOF membrane coated HZSM-5@UIO-66-NH2 nanocrystals, and Pd nanoparticles were well-dispersed on its membrane surface. The catalyst HZSM-5@UIO-66-NH2/Pd exhibited high CO selectivity (92.2%) in CO2 hydrogenation.

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“…8−11 Among them, photothermal catalytic CO 2 reduction has been regarded as one of the most promising ways of solar-tochemical conversion. 12−14 Many group VIII metal nanoparticles, such as Pt, 15,16 Fe, 17 Pd, 18 Ni, 19,20 and so forth, have been reported to show catalytic activity for the reverse water gas shift (RWGS) reaction (CO 2 + H 2 → CO + H 2 O). However, controlling the product selectivity of CO 2 reduction remains a major challenge, as RWGS and methanation (CO 2 + 4H 2 → CH 4 + 2H 2 O) of CO 2 reduction are competitive processes at moderate temperatures.…”

Section: Introductionmentioning

confidence: 99%

Selective Photothermal Reduction of CO₂ to CO over Ni-Nanoparticle/N-Doped CeO₂ Nanocomposite Catalysts

Jia

Ning

Tong

et al. 2021

ACS Appl. Nano Mater.

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Photothermal reverse water gas shift reaction is one of the promising methods to palliate global energy and environmental issues. Searching for catalysts with high activity and CO selectivity for CO 2 conversion has been attracting extensive attention. In this work, Ni nanoparticleloaded N-doped CeO 2 (Ni/N-CeO 2 ) composite catalysts were synthesized using a three-step method. Under light irradiation, the optimal Ni/N 5.0 -CeO 2 exhibited a CO yield rate of 20.9 mmol• g cat −1 •h −1 with almost 100% of CO selectivity via photothermal CO 2 reduction. As a comparison, Ni/CeO 2 , without nitrogen doping, showed a high CH 4 selectivity. The strong light absorption of Ni/N 5.0 -CeO 2 mainly by loading of Ni nanoparticles and the enhanced adsorption/activation of CO 2 molecules due to increased oxygen vacancies in N 5.0 -CeO 2 by N-doping were supposed to account for the excellent catalytic performances. The doping of nitrogen was of particular importance for the formation of N−H bonds, which could modulate the reaction pathway for promoting the reduction of CO 2 toward CO while suppressing the undesirable CO 2 methanation process.

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Spherical Sandwich Pt/Au@Pd@UIO-67@UIO-N (N = 66, 67, 69) Core–Shell Catalysts: Zr-Based Metal–Organic Framework Effectively Regulating the Reverse Water–Gas Shift Reaction

Cited by 3 publications

References 4 publications

Converting CO₂ Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

Converting CO₂ Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

Metal–Organic Framework-Membranized Bicomponent Core–Shell Catalyst HZSM-5@UIO-66-NH₂/Pd for CO₂ Selective Conversion

Selective Photothermal Reduction of CO₂ to CO over Ni-Nanoparticle/N-Doped CeO₂ Nanocomposite Catalysts

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Spherical Sandwich Pt/Au@Pd@UIO-67@UIO-N (N = 66, 67, 69) Core–Shell Catalysts: Zr-Based Metal–Organic Framework Effectively Regulating the Reverse Water–Gas Shift Reaction

Cited by 3 publications

References 4 publications

Converting CO2 Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

Converting CO2 Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

Metal–Organic Framework-Membranized Bicomponent Core–Shell Catalyst HZSM-5@UIO-66-NH2/Pd for CO2 Selective Conversion

Selective Photothermal Reduction of CO2 to CO over Ni-Nanoparticle/N-Doped CeO2 Nanocomposite Catalysts

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Converting CO₂ Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

Converting CO₂ Hydrogenation Products from Paraffins to Olefins: Modification of Zeolite Surface Properties by a UIO-n Membrane

Metal–Organic Framework-Membranized Bicomponent Core–Shell Catalyst HZSM-5@UIO-66-NH₂/Pd for CO₂ Selective Conversion

Selective Photothermal Reduction of CO₂ to CO over Ni-Nanoparticle/N-Doped CeO₂ Nanocomposite Catalysts