ENGINEERING NI/AL2O3 CATALYSTS BY ATOMIC LAYER DEPOSITION FOR METHANE REFORMING

<p>"Dry reforming of methane (DRM) could be a promising choice to utilize natural gas (mainly methane or CH₄), recycle captured CO₂, and produce valuable syngas. Promoters (e.g., CeO₂ and MgO) on Ni/Al₂O₃ prepared by atomic layer deposition (ALD) and ALD-prepared ultrathin overcoating (e.g., ZrO₂ and CeO_x) on Ni/Al₂O₃ prepared by incipient wetness method were investigated for methane reforming.</p> <p>MgO and CeO₂ prepared by traditional incipient wetness method were used to promote the performance of ALD-prepared Ni nanoparticles (NPs) supported on four-channel α-Al₂O₃ hollow fibers and Al₂O₃ NPs support for DRM. CeO2 could help release NiO from inactive NiAl₂O₄. MgO could introduce surface oxygen and enhanced the adsorption of CO₂.</p> <p>ALD technique could effectively deposit highly dispersed Ni NPs (average size of 4.3 nm) on multiple 20-cm long four-channel α-Al₂O₃ hollow fibers for DRM. The design of a fixed bed reactor and better distribution of gas flow in the reactor could significantly improve the performance of Ni/Al₂O₃-HF catalysts by reducing the void space.</p> <p>ALD-prepared ultrathin ZrO₂ or CeO_x overcoating was used to promote Ni/Al₂O₃ catalyst for methane reforming. During the reduction process, ZrO₂ ALD overcoating cracked and exposed the active Ni NPs and generated oxygen vacancy. CeO_x ALD overcoating exhibited a sub-stoichiometric form with oxygen vacancy-rich property"--Abstract, p. iv</p>

Name thesis:degree_name

Ph. D. in Chemical Engineering

Grantor

Missouri University of Science and Technology

Author dc:creator

• Jin, Baitang

• Chemical Engineering
• Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/3212

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-4217