In-situ deoxygenation of methyl palmitate to hydrocarbons on highly dispersed Ni–Re/TiO2 catalyst in aqueous phase using methanol as a hydrogen donor

Ai, Li; Shi, Haonan; Chen, Jixiang

doi:10.1016/j.joei.2023.101265

Cited by 8 publications

(3 citation statements)

References 53 publications

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“…87–0712), and all samples except the Ni@C catalyst exhibit low and broad diffraction peaks, indicating that the NiRe@C catalyst has a low crystallinity and the active metal Ni is highly dispersed in the carbon carrier. This may be due to the fact that the rhenium doping contributed significantly to the nickel dispersion, which is in agreement with the BET results . However, the diffraction peaks of Re are negligible in some catalysts with Ni/Re ratios greater than 1 due to its low content and high dispersion characteristic.…”

Section: Resultssupporting

confidence: 85%

“…This may be due to the fact that the rhenium doping contributed significantly to the nickel dispersion, which is in agreement with the BET results. 36 However, the diffraction peaks of Re are negligible in some catalysts with Ni/Re ratios greater than 1 due to its low content and high dispersion characteristic. With the Ni/Re ratio decreased, a new diffraction peak attributed to Re appears at 1/1 (JCPDS PDF no.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

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Upgrading of Aqueous Ethanol to Long-Chain Alcohols over Immobilized Highly Dispersed Ni–Re Catalyst

Zhang,

Liu,

Jiang

et al. 2024

Ind. Eng. Chem. Res.

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Motivated by the carbon neutrality policy and the demand for value-added bio-based chemicals, it is of great significance and interest to directly upgrade aqueous ethanol to produce long-chain alcohol chemicals and transportation biofuel. In this study, a bimetallic catalyst composed of Re doped Ni@C was prepared by a facile sol–gel method. The bimetal 70-NiRe@C demonstrated higher selectivity toward target long-chain alcohols product and lower selectivity of C1 byproducts than the monomeric metal Ni@C. The addition of Re promotes the dispersion of active Ni on the graphite carrier, contributing to the superior 59.9% ethanol conversion and 45.0% long-chain alcohol yield. This work guides future research into the direct upgrading of water-based bioethanol to the value-added long-chain fine chemicals and biofuels required.

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Section: Resultssupporting

confidence: 85%

Section: Catalyst Characterizationmentioning

confidence: 99%

Upgrading of Aqueous Ethanol to Long-Chain Alcohols over Immobilized Highly Dispersed Ni–Re Catalyst

Zhang,

Liu,

Jiang

et al. 2024

Ind. Eng. Chem. Res.

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“…Alkanols, such as methanol, ethanol, propan-1-ol, and isopropanol, are also considered to be hydrogen-donating compounds. − However, since the dissociation energies of -O-H bonds are much higher than those of ARCH 2 -H bonds, directly donating H • by cleaving -O-H bonds is difficult. In fact, the alkoxy group in an alkanol is a nucleophilic group, which can attack a carbon atom connected with an oxygen atom and subsequently cleave the >CH 2 -O- or >C ar -O- bonds followed by hydrogen transfer from the -OH group in the alkanol to the oxygen atom; i.e., the hydrogen donation of alkanols is induced by alkanolyses. − …”

Section: The Roles Of Benzylic Hydrogen In the Nchc Of Heavy Carbon R...mentioning

confidence: 99%

Advances in Catalytic Hydroconversion of Typical Heavy Carbon Resources under Mild Conditions

Wei

Bai

et al. 2023

Energy Fuels

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Low-rank coals, biomass, and heavy petroleum are typical heavy carbon resources, which are currently not efficiently used, and many processes for the current use of the heavy carbon resources cause severe environmental pollution with very limited economic benefits even with a great deficit. Efficiently using the heavy carbon resources can greatly improve the environment and create huge economic benefits. The main difficulty in efficiently using the heavy carbon resources is the high content of aromatic rings (ARs) and heteroatoms in addition to the insoluble and complex macromolecular structures of the heavy carbon resources. Catalytic hydroconversion (CHC) includes catalytic hydrocracking and subsequent catalytic hydrofining. Many low-rank coals consist of macromolecular species, which are rich in bridged linkages connecting structural units, especially ARs, on which side chains are usually contained. Many ARs, bridged linkages, and side chains contain heteroatoms. Over a proper active catalyst, many bridged linkages and even some side chains can be cleaved, and many heteroatoms outside the ARs can be removed by the CHC under mild conditions to get soluble portions with relatively simple composition, facilitating subsequent separation to obtain pure chemicals, especially value-added products, such as condensed aromatics. The remaining economically inseparable species can be converted to liquid chemicals, especially nonsubstituted and alkyl-substituted cyclanes, by subsequent catalytic hydrofining. Catalysts and catalytically formed active hydrogen play crucial roles in the processes. Mainly based on our investigations, the related advances are reviewed in this work.

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Polymethyl Methacrylate assisted mesoporous TiO2 supported Ni–Co alloy catalysts for the in situ hydrodeoxygenation of methyl palmitate

Feng,

Zhou,

Jiang

et al. 2024

Reac Kinet Mech Cat

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In-situ deoxygenation of methyl palmitate to hydrocarbons on highly dispersed Ni–Re/TiO2 catalyst in aqueous phase using methanol as a hydrogen donor

Cited by 8 publications

References 53 publications

Upgrading of Aqueous Ethanol to Long-Chain Alcohols over Immobilized Highly Dispersed Ni–Re Catalyst

Upgrading of Aqueous Ethanol to Long-Chain Alcohols over Immobilized Highly Dispersed Ni–Re Catalyst

Advances in Catalytic Hydroconversion of Typical Heavy Carbon Resources under Mild Conditions

Polymethyl Methacrylate assisted mesoporous TiO2 supported Ni–Co alloy catalysts for the in situ hydrodeoxygenation of methyl palmitate

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