Effect of NH 4 + exchange on CuY catalyst for oxidative carbonylation of methanol

Zheng, Huayan; Li, Zhong

doi:10.1016/s1872-2067(16)62490-7

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…For the 20Cu–SiO 2 - x catalysts the variation trends of the strong acid site amount and the Cu 2+ /Si molar ratio with the enhancement of the synthetic solution alkalinity were synchronous (Table ). This suggested that the strong acidity of the w Cu–SiO 2 - x catalysts arose from Cu 2+ , which coincided with the literature. , Meanwhile, this was also confirmed by the calcined 20Cu–SiO 2 -10.5 sample with the predominant Cu 2+ possessing a high proportion of the strong acid sites (Figure S9). On the other hand, the decreased amount of surface Cu 2+ in the 30Cu–SiO 2 -10.5 catalyst can be ascribed to the substantial decline of the specific surface area.…”

Section: Resultssupporting

confidence: 86%

Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO₂ Catalysts

Yuan

Xie

et al. 2020

ACS Sustainable Chem. Eng.

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In the present work, Cu–SiO2 catalysts were synthesized by the modified one-pot hydrothermal strategy and employed in the anaerobic dehydrogenation of 2,3-butanediol to clarify the specific dehydrogenation mechanism of diols. Characterization results testified that the properties of −Si–O–Cu–O–Si– structures (CuO-like phase) formed in Cu–SiO2 catalysts can be regulated by precisely tuning the copper loading and synthetic solution alkalinity. The superior catalytic performance with 76.0% conversion of 2,3-butanediol and 94.5% selectivity toward acetoin was achieved over the resulting 20Cu–SiO2-10.5 catalyst. Both experimental and DFT studies demonstrated that the dehydrogenation performance of Cu–SiO2 catalysts originated from the metal–support interface via the synergic catalysis of the interfacial CuO-like phase and Cu0 sites. The CuO-like phase promotes the cleavage of the −O–H bond in 2,3-butanediol by interacting with the Cu2+–O2– pair, and subsequently the other H atom is removed from the α-C–H bond in the generated alkoxy intermediate on neighboring Cu0 sites. Meanwhile, 2,3-butanediol follows the reaction pathway of the dehydrogenation of two −OH groups on the surface of Cu particles, and the generated dialkoxy intermediate strongly adsorbs on Cu0 sites, leading to the deactivation of Cu–SiO2 catalysts as well as the catalytic inertness of impregnated Cu catalysts only having Cu0 sites.

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Section: Resultssupporting

confidence: 86%

Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO₂ Catalysts

Yuan

Xie

et al. 2020

ACS Sustainable Chem. Eng.

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“…Three major peaks were observed for Fe 2 O 3 /HY: (i) reduction of surface oxygen species, which was present in the form of a shoulder in the 300–350 °C region; (ii) reduction of lattice oxygen on Fe 2 O 3 (i.e., the reduction of Fe 2 O 3 to Fe 3 O 4 ), centered at 400 °C; and (iii) a broad asymmetric multipeak feature above 410 °C, signifying degradation of Fe 3 O 4 to FeO and FeO to Fe. The reduction of bulk oxygen on the zeolite Y support occurred above 1000 °C, and the absence of a reduction peak below 800 °C was consistent with a previous study . H 2 -TPR of Na + -poisoned Fe 2 O 3 /HY was also performed.…”

Section: Results and Discussionsupporting

confidence: 90%

“…The reduction of bulk oxygen on the zeolite Y support occurred above 1000 °C, and the absence of a reduction peak below 800 °C was consistent with a previous study. 39 H 2 -TPR of Na + -poisoned Fe 2 O 3 /HY was also performed. From the bottom spectrum shown in Figure 8, the Na + -poisoned sample also displays three sets of reduction peaks.…”

Section: External Surface and Internal Pore Area Analysis As Shown In...mentioning

confidence: 99%

Fe₂O₃/HY Catalyst: A Microporous Material with Zeolite-Type Framework Achieving Highly Improved Alkali Poisoning-Resistant Performance for Selective Reduction of NO_x with NH₃

Huang

Zhang

et al. 2020

Environ. Sci. Technol.

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The commercially available V2O5/WO3–TiO2 is a well-known catalyst for selective catalytic reduction (SCR) of NO with NH3. When alkali ions are present in the exhaust (e.g., as impurities such as dust) of a reactor containing commercial V2O5/WO3–TiO2, alkali poisoning occurs, deactivating the catalyst. Consequently, there is substantial interest in the development of better-performing and more durable NH3–SCR catalysts with an improved resistance to alkali deactivation. For the present study, the protonated (H+) form of zeolite Y, HY, was used as a support and acted as buffer zone, leading to trapping (sticking) of foreign alkali poisons in the zeolite pore structure, preventing alkali poisoning of the Fe2O3/HY catalyst. Catalytic tests showed that the Fe2O3/HY retained 100% of its original catalytic reactivity for NH3–SCR reaction even after 1000 μmol Na+ g–1 poisoning. 1000 μmol Na+ g–1 treatment indicates a 26 000-h exposure under an alkaline dust-containing condition. In contrast, upon 1000 μmol Na+ g–1 treatment, severe alkali deactivation occurred for a commercial V2O5/WO3–TiO2. The catalyst activity of Fe2O3/HY remained unchanged because of the intercalation of Na+ in the internal HY zeolite pores that impedes the blocking of Na+ poison to the external active sites of Fe2O3. The findings in this work suggest that the zeolite HY may be revealed as an attractive building block for designing an alkali poisoning-resistant catalyst.

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“…Dimethyl carbonate (DMC) is a green chemical with low toxicity and easy degradability, [1][2][3] which has extensive applications in the fields of pharmaceuticals, coatings, and lithium-ion battery electrolytes. 4,5 Currently, the main techniques used for synthesizing DMC include methanol phosgenation, 6 oxidative carbonylation of methanol, 7 tranesterification, 8 urea alcoholysis, 9,10 direct synthesis from carbon dioxide, [11][12][13] and decarbonylation of dimethyl oxalate. 14 The phosgene process was the first to be used for large-scale production of DMC and has been limited in the industry owing to the toxic raw material involved.…”

Section: Introductionmentioning

confidence: 99%

Decarbonylation of dimethyl oxalate to dimethyl carbonate over Cs₂CO₃/HZSM-5

Jv,

Li,

et al. 2024

New J. Chem.

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Effect of NH 4 + exchange on CuY catalyst for oxidative carbonylation of methanol

Cited by 15 publications

References 32 publications

Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO₂ Catalysts

Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO₂ Catalysts

Fe₂O₃/HY Catalyst: A Microporous Material with Zeolite-Type Framework Achieving Highly Improved Alkali Poisoning-Resistant Performance for Selective Reduction of NO_x with NH₃

Decarbonylation of dimethyl oxalate to dimethyl carbonate over Cs₂CO₃/HZSM-5

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Effect of NH 4 + exchange on CuY catalyst for oxidative carbonylation of methanol

Cited by 15 publications

References 32 publications

Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO2 Catalysts

Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO2 Catalysts

Fe2O3/HY Catalyst: A Microporous Material with Zeolite-Type Framework Achieving Highly Improved Alkali Poisoning-Resistant Performance for Selective Reduction of NOx with NH3

Decarbonylation of dimethyl oxalate to dimethyl carbonate over Cs2CO3/HZSM-5

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Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO₂ Catalysts

Highly Efficient Dehydrogenation of 2,3-Butanediol Induced by Metal–Support Interface over Cu-SiO₂ Catalysts

Fe₂O₃/HY Catalyst: A Microporous Material with Zeolite-Type Framework Achieving Highly Improved Alkali Poisoning-Resistant Performance for Selective Reduction of NO_x with NH₃

Decarbonylation of dimethyl oxalate to dimethyl carbonate over Cs₂CO₃/HZSM-5