REACTIVITY AND MORPHOLOGY OFNi,Mo, ANDNi–MoOXIDE CLUSTERS SUPPORTED ON MCM-48 TOWARD THIOPHENE HYDRODESULPHURIZATION

Bartholomew, Catherine; Chakradhar, A.; Burghaus, U.; Wu, Chia‐Ming; Peng, Rui; Mishra, Srujan; Koodali, Ranjit T.

doi:10.1142/s0218625x14500607

Cited by 2 publications

(3 citation statements)

References 36 publications

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“…Molybdenumbased catalysts are standard model systems for HDS; zeolites are used as supports. 24 Because the silica films need to be synthesized on Mo supports, it appears natural to explore HDSrelated surface chemistry on silicatene. Also, the pore structure of silicatene exposes Mo sites of the support.…”

Section: Introductionmentioning

confidence: 99%

“…In hydrodesulfurization (HDS), sulfur-containing species are treated with hydrogen by catalysts to obtain sulfur-free hydrocarbons. − In model studies, thiophene, C 4 H 4 S, is the probe molecule of choice because it is a part of natural petroleum and is a simple enough molecule from which to obtain mechanistic, molecular-level information. Molybdenum-based catalysts are standard model systems for HDS; zeolites are used as supports . Because the silica films need to be synthesized on Mo supports, it appears natural to explore HDS-related surface chemistry on silicatene.…”

Section: Introductionmentioning

confidence: 99%

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Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

2018

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The kinetics of thiophene and alkane adsorption on silicatene (i.e., on two-dimensional atomically thin and crystalline silica films) was studied by employing (multimass) thermal desorption spectroscopy (TDS) at ultrahigh vacuum. The monoatomic SiO2 film is grown on a Mo(112) support. Thiophene is a standard probe molecule for hydrodesulfurization (HDS); alkanes typically form as reaction products; Mo is a catalyst for HDS. The samples were characterized by Auger electron spectroscopy and low-energy electron diffraction as well as the silica film additionally by water TDS. The silicatene film is hydrophobic. All probe molecules adsorbed nondissociatively on silicatene. Two TDS peaks in the monolayer range are evident as well as a condensation structure. Thiophene binds with 42.6 ± 0.5 kJ/mol in the limit of zero coverage. Using a Redhead analysis and assumed pre-exponential of 1 × 1013/s, the (low coverage) binding energy of the alkanes (isobutane, n-pentane, and n-heptane) increases from 34.1 to 46.8 (±0.5) kJ/mol with the chain length. A more sophisticated data analysis (direct inversion of the Polanyi–Wigner equation) reveals a chain-length-dependent pre-exponential and binding energy. In addition, the adsorption dynamics of butane was characterized by molecular beam scattering. The adsorption probabilities and binding energies are systematically smaller for silicatene than for polycrystalline bulk silica wafer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

2018

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“…Deionization Resin is a common medium used to filter water systems of all kinds. Most importantly, a new type mesoporous material (MCM-48) based hybrid material with embedded metallic oxide nanoparticles was synthesized and used as the filter media between the down spout filter and the storage unit [13][14][15][16][17][18].…”

Section: Engineering Approachesmentioning

confidence: 99%

A Portable Stormwater Runoff Collection and Treatment System for Urban Agriculture and Food Security

2017 ASEE Mid Atlantic Section Spring Conference Proceedings

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With the fast increase of urban population, vast quantities of energy and water are being consumed whilst harmful quantities of wastewater and stormwater runoff are generated through the creation of massive impervious areas. Food security is becoming an increasingly important issue, especially urban residents here in US. There is an urgent need of developing effective and economical feasible solution for the best management practices to minimize storm water runoff, reduce soil erosion, maintain groundwater recharge, and minimize surface water and groundwater contamination from combined sewer overflows. In this study, a novel stormwater collection and treatment system is developed, which can harvest and store stormwater from densely populated urban areas and use it to produce food at relatively low costs. This system consists of an expandable storage tank that has a minimum volume and occupied space of 5 cubic feet and can expand to a theoretical maximum volume of 9 cubic feet almost doubling the size of the tank. The filtration system is a mechanical filtration with a filter size of 250 microns and a chemical filtration system with a mesoporous nanostructured material to filter heavy metals and other pollutants. This proposed system will help reduce food miles (carbon emissions) and virtual water consumption and serves to highlight the need for more sustainable land-use planning.

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REACTIVITY AND MORPHOLOGY OFNi,Mo, ANDNi–MoOXIDE CLUSTERS SUPPORTED ON MCM-48 TOWARD THIOPHENE HYDRODESULPHURIZATION

Cited by 2 publications

References 36 publications

Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

A Portable Stormwater Runoff Collection and Treatment System for Urban Agriculture and Food Security

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