Shifting Pathways in the Phenol/2-Propanol Conversion over the Tandem Raney Ni + ZSM-5 Catalytic System

García-Minguillán, A. M.; Briones, L.; Serrano, David; Botas, Juan A.; Escola, J.M.

doi:10.1021/acs.iecr.9b07015

Cited by 9 publications

(10 citation statements)

References 39 publications

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“…In the last 10 years, various binary catalytic systems based on Raney Ni catalyst have been developed. As given in Table , the solid acid catalysts shifted from ion-exchange resins to more robust zeolites (H-beta and ZSM-5), , and the reaction temperature was decreased from 300 °C to less than 200 °C . High-pressure hydrogen could be also avoided by using methanol ,, or 2-propanol as the hydrogen source.…”

Section: Raney Ni For Biomass Conversionmentioning

confidence: 99%

Raney Ni as a Versatile Catalyst for Biomass Conversion

et al. 2021

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Raney Ni is a class of fine-grained heterogeneous catalysts composed mostly of nickel that is widely applied in organic synthesis and a large number of industry processes. In the past 10 years, various excellent research achievements have been obtained due to the emerging field of biomass conversion, which opened another dimension to this catalyst. This review starts with a brief introduction to the history of Raney Ni from its creation to its development. The subsequent sections provide a comprehensive discussion of the synthetic strategies and their controls from the perspective of structure and composition. We focus especially on the current applications in biomass conversion, including the catalytic upgrading of raw biomass resources and the derived platform chemicals. In this review, we try to gain a great understanding of this unique catalyst and its special role in biomass conversion in comparison with supported Ni catalysts. The outstanding catalytic performance of Raney Ni may inspire researchers to explore more elegant preparation methods and emerging applications.

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Section: Raney Ni For Biomass Conversionmentioning

confidence: 99%

Raney Ni as a Versatile Catalyst for Biomass Conversion

et al. 2021

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“…High yields of aromatics (28%) can be obtained at very low Ni loading (0.1 wt.%), and there is no difference in the selectivity of aromatic products when the amount of Ni added is 0.1, 0.5, or 1.0% (Chen et al, 2018 ). The study on effect of reaction temperature on conversion of phenol with hierarchical Ni-ZSM-5 shows that the main products were mostly benzene and cyclohexene formed by phenol deoxygenation at low and intermediate temperatures (393 and 423 K) whereas a shift in the reaction pathways occurred at higher temperature (448 K), leading to high slectivity of valuable alkylphenols (mostly cresols and cyclohexylphenols) generated by the occurrence of alkylation reactions catalyzed by the zeolite acid sites (García-Minguillan et al, 2020 ). The mixture of microporous ZSM-5 and another mesoporous zeolite is also employed for catalytic pyrolysis of biomass.…”

Section: Ni Modified Zsm-5mentioning

confidence: 99%

The Effect of Ni-ZSM-5 Catalysts on Catalytic Pyrolysis and Hydro-Pyrolysis of Biomass

et al. 2020

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With the demand of energy and re-utilization of wastes, the renewable lignocellulosic biomass, has attracted increasing and significant attention for alleviating the growing energy crisis and environment problems. As main components of lignocellulosic biomass, lignin, cellulose, and hemicellulose are connected by hydrogen bond to form a compact skeleton structure, resulting the trenchant condition of biomass pyrolysis. Also, pyrolysis products of above three main constituents contain a large amount of oxygenates that cause low heating value, high corrosiveness, high viscosity, and instability. Meanwhile, zeolites are of considerable significance to the conversion of lignocellulosic biomass to desirable chemical products on account of fine shape selectivity and moderate acid sites and strength. Among numerous zeolites, ZSM-5-based catalysts have been most extensively studied, and the acidity and porosity of ZSM-5 can be tuned by changing the content of Si or Al in zeolite. Beyond that, doping of other metal elements, such as Mn, Co, Ni, Ga, Ce, Pt, into ZSM-5 is also an efficient way to regulate the strength and density of acid sites in zeolite precisely. This review focused on the recent investigation of Ni-modified microporous ZSM-5 used in catalytic pyrolysis of lignin and cellulose. The application of metal-modified hierarchical ZSM-5 is also covered.

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“…This fact has been recently proved in the hydroconversion of n-alkanes towards branched hydrocarbons over Pt/HZSM-22/Al 2 O 3 catalysts. 38 In a previous study, we reported that the tandem catalytic system RANEY® Ni plus nanocrystalline or hierarchical ZSM-5 39 unveiled alkylation reactions in the phenol conversion alongside the expected reactions (ring saturation, dehydrogenation and dehydration). This alkylation shifted the selectivity towards bulky alkylphenolic products, cresols and cyclo-hexylphenols being the main ones obtained (36% and 17% selectivity respectively over RANEY® Nickel plus hierarchical ZSM-5 at 175 °C).…”

Section: Introductionmentioning

confidence: 95%