Effect of initial Si/Al ratios on the performance of low crystallinity Hβ-<i>x</i> zeolite supported NiMo carbide catalysts for aromatics hydrogenation

Jiang, Chenguang; Wang, Yangang; Zhang, Haiyong; Chang, Nai Wen; Li, Lei; Xie, Kui; Mochida, Isao

doi:10.1039/c9cy00885c

Cited by 14 publications

(7 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the difference caused by different metal dispersions can be eliminated. [18,[27][28] As shown in Figure S3 and Figure S4, typical morphologies of the supports were observed Table 1. Comparison of the Pd catalysts loaded on different supports.…”

Section: Structure and Morphology Characterizationmentioning

confidence: 79%

Deep Hydrogenation Saturation of Naphthalene Facilitated by Enhanced Adsorption of the Reactants on Micro‐Mesoporous Pd/HY

Wang

Zhang

et al. 2021

ChemistrySelect

View full text Add to dashboard Cite

Deep hydrogenation saturation of polycyclic aromatic hydrocarbons is of great importance for the production of valuable chemical products, but is hard due to the presence of hardly broken π bond. In this work, micro-mesoporous HY supported Pd catalysts (Pd/HY-a) have been prepared by a simple impregnation method following alkali treatment of pristine HY zeolite, which exhibited superior performance for the deep hydrogenation saturation of naphthalene. Pd/HY-a was systematically characterized and compared with the Pd catalysts supported on pristine HY, ZSM-5, SBA-15, and Al 2 O 3 . In Pd/HY-a, abundant mesoporous pore channels together with suitable B acid sites greatly facilitate the adsorption of the reactants (naphthalene and tetralin) and properly tune the electron state of loaded Pd. Therefore, efficient deep hydrogenation saturation of naphthalene has been achieved on Pd/HY-a. Moreover, the kinetic behaviors of naphthalene hydrogenation on Pd/HYa were preliminarily investigated, in which the first-order kinetic model fitted the experimental data well in the early reaction stage.

show abstract

Section: Structure and Morphology Characterizationmentioning

confidence: 79%

Deep Hydrogenation Saturation of Naphthalene Facilitated by Enhanced Adsorption of the Reactants on Micro‐Mesoporous Pd/HY

Wang

Zhang

et al. 2021

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…So N–Mo/SEP catalyst exhibited higher performance for LDSE than H–Mo/SEP catalyst.. Additionally, the acidic sites of catalyst play an important role for HDO activity during LDSE. It had been reported acid sites could adsorb C–O bond of lignin because of its polar trait and readily available basic oxygen electronic doublet. ,,,, Distinctively, the Brønsted acid site was helpful for enhancing the performance of hydrogenation and isomerization reaction, and Lewis acid site could weaken C–O–C and C–O ether bond in the lignin subunits and formed intermediate fragment. ,, According to above Py-IR spectra analysis, the C–Mo/SEP and N–Mo/SEP present optimized distributions of B and L acid sites as compared H–Mo/SEP catalyst. Therefore, the unique catalytic performance of N–Mo/SEP could be attributed to the synergistic effect among Mo 5+ species, moderate acid content, and optimized B/L acid site distribution …”

Section: Resultsmentioning

confidence: 94%

“…It had been reported acid sites could adsorb C−O bond of lignin because of its polar trait and readily available basic oxygen electronic doublet. 15,35,54,62,63 Distinctively, the Brønsted acid site was helpful for enhancing the performance of hydrogenation and isomerization reaction, 35 and Lewis acid site could weaken C−O−C and C−O ether bond in the lignin subunits and formed intermediate fragment. 12,15,30 According to above Py-IR spectra analysis, the C−Mo/SEP and N−Mo/SEP present optimized distributions of B and L acid sites as compared H−Mo/SEP catalyst.…”

Section: Resultsmentioning

confidence: 99%

Effect of Reduction Treatments of Mo/Sepiolite Catalyst on Lignin Depolymerization under Supercritical Ethanol

Chen

Wang

et al. 2020

Energy Fuels

View full text Add to dashboard Cite

Depolymerization of lignin to produce high yield lignin oil is one of the prospective methods to achieve the sustainable and economic development for human society. Molybdenum-based sepiolite (Mo/SEP) catalyst presented a promising performance for lignin depolymerization under supercritical ethanol (LDSE). Herein, the influence of reductive treatments for calcined Mo/SEP (C-Mo/SEP) catalyst on lignin depolymerization was systematically investigated under supercritical ethanol. Two reduced catalysts N-Mo/SEP and H-Mo/SEP was obtained respectively through the reduction process by NaBH4 and 10 vol % H2/N2 flow. The characterizations such as N2 adsorption–desorption, SEM, XRD, FTIR, XPS, NH3-TPD, and Py-FTIR were employed to investigate the variation of microcosmic structure and property of Mo/SEP affected by reductive treatments. The results exhibited that reduction treatment optimized the distributions of Mo5+ species and B/L acidic sites of Mo/SEP catalysts. During the LDSE process at 290 °C under N2 atmosphere for 3 h, lignin oil produced over N–Mo/SEP catalyst gave a higher heating value of 34.92 MJ/kg, which slightly decreased from 36.07 MJ/kg that was obtained over C-Mo/SEP. But N-Mo/SEP catalyst generated the highest yields of lignin oil (112.0%) and petroleum ether soluble (PES) product (74.6%). According to the GC-MS results, the possible mechanism of N-Mo/SEP catalytic LDSE was proposed. The synergistic effect between Mo5+ species and B/L acid sites promoted the cracking of the Caryl–OCH3 bond, and the moderate acid amounts enhanced the alkylation reaction.

show abstract

“…There are many supports for aromatic hydrogenation, such as zeolite has an ordered pore and channel structure, the advantages of high specific surface area and good thermal stability. Zeolite is widely used as a support material in the hydrogenation of aromatics and is often used to improve the quality of oil products [21] . So far, many mesoporous molecular sieves with typical two‐dimensional hexagonal structures have been used as supports for hydrogenation catalysts, such as MCM‐41 and SBA‐15, which in addition to the characteristics of each adsorbent, have a high surface area, highly active and thermally stable [22] .…”

Section: Nickel‐based Catalysts For Hydrogenation Of Aromatic Hydroca...mentioning

confidence: 99%

Supported Nickel‐based Catalysts for Heterogeneous Hydrogenation of Aromatics

Wang,

Zhang,

Zhang

et al. 2023

ChemistrySelect

View full text Add to dashboard Cite

Aromatic hydrocarbons are carcinogenic and can induce mutations in living organisms, posing a threat to the ecological environment and human life and health. Catalytic hydrogenation of aromatics to reduce the saturation of aromatics not only reduces their toxicity, but also greatly increases their potential value. Compared with the unsupported catalysts with only active components, the supported metal catalysts have higher catalytic activity and better selectivity, the catalytic activity of the hydrogenation reaction depends on the metal active phase and catalyst support. On metal/acid catalysts, the metal active center and nearby acid sites are involved in the conversion of aromatics, the active hydrogen leaking from the metal center can hydrogenate the adsorbed aromatics at the acid site. This paper reviews the recent research progress of nickel‐based catalysts for aromatic hydrocarbon catalytic hydrogenation and discusses the development prospects and challenges faced by non‐precious metal catalysts. In addition, the sulfur tolerance and hydrogen storage properties of catalysts for aromatics are reviewed.

show abstract

Effect of initial Si/Al ratios on the performance of low crystallinity Hβ-x zeolite supported NiMo carbide catalysts for aromatics hydrogenation

Abstract: The initial Si/Al ratio of supports influences the active metal composition and dispersion, acidity of NiMoC/Hβ-x catalysts, and performance of aromatic hydrogenation.

Cited by 14 publications

References 54 publications

Deep Hydrogenation Saturation of Naphthalene Facilitated by Enhanced Adsorption of the Reactants on Micro‐Mesoporous Pd/HY

Deep Hydrogenation Saturation of Naphthalene Facilitated by Enhanced Adsorption of the Reactants on Micro‐Mesoporous Pd/HY

Effect of Reduction Treatments of Mo/Sepiolite Catalyst on Lignin Depolymerization under Supercritical Ethanol

Supported Nickel‐based Catalysts for Heterogeneous Hydrogenation of Aromatics

Contact Info

Product

Resources

About