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Preparation of Sn-doped 2–3 nm Ni nanoparticles supported on SiO2 via surface organometallic chemistry for low temperature dry reforming catalyst: The effect of tin doping on activity, selectivity and stability

Paper ID Volume ID Publish Year Pages File Format Full-Text
54696 47020 2014 8 PDF Available
Title
Preparation of Sn-doped 2–3 nm Ni nanoparticles supported on SiO2 via surface organometallic chemistry for low temperature dry reforming catalyst: The effect of tin doping on activity, selectivity and stability
Abstract

•Preparation of 2.2 ± 0.4 nm nickel nanoparticles supported on SiO2.•Nickel was doped via SOMC with tin leading to 2–3 nm NiSnx particles (0 < x ≤ 0.32).•Catalyst tested in CO2 reforming of CH4 at 773 K in kinetic conditions.•Sn did not influence the catalysts selectivity, deactivation rate, coke formation.•Tin doping results in a 3–4-fold decrease of surface Ni intrinsic activity.

Silica supported nickel nanoparticles of 2.2 ± 0.4 nm diameter were selectively doped with tin by surface organometallic chemistry while keeping the particle size nearly constant. The catalysts with various tin contents were doped and characterized by TEM, XRD and H2 chemisorption. In contrast to what is found at high temperature (≥973 K), dry reforming tests performed at 773 K and successive TPO and TEM analysis showed that tin neither influences the catalyst deactivation rate nor prevents coke formation, present in the form of encapsulating carbon. The nickel dopant does not influence either the selectivity, ruled by reverse water gas shift Thermodynamics, but was shown to have a 3–4-fold decrease of intrinsic activity of the available surface nickel, thus indicating that Sn has a negative effect on adjacent Ni atoms.

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Keywords
Nickel nanoparticles; tin alloy; Silica-supported; Carbon dioxide reforming of methane; Selective poisoning
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Preparation of Sn-doped 2–3 nm Ni nanoparticles supported on SiO2 via surface organometallic chemistry for low temperature dry reforming catalyst: The effect of tin doping on activity, selectivity and stability
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 235, 15 October 2014, Pages 237–244
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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