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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on CeY by Materials Project

CeY is Magnesium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Ce is bonded to six equivalent Ce and six equivalent Y atoms to form CeCe6Y6 cuboctahedra that share corners with eighteen equivalent CeCe6Y6 cuboctahedra, edges with six equivalent CeCe6Y6 cuboctahedra, edges with twelve equivalent YCe6Y6 cuboctahedra, faces with eight equivalent CeCe6Y6 cuboctahedra, and faces with twelve equivalent YCe6Y6 cuboctahedra. All Ce–Ce bond lengths are 3.52 Å. All Ce–Y bond lengths are 3.53 Å. Y is bonded to six equivalent Ce and six equivalent Y atoms to form YCe6Y6 cuboctahedra that share corners with eighteen equivalent YCe6Y6 cuboctahedra, edges with six equivalent YCe6Y6 cuboctahedra, edges with twelve equivalent CeCe6Y6 cuboctahedra, faces with eight equivalent YCe6Y6 cuboctahedra, and faces with twelve equivalent CeCe6Y6 cuboctahedra. All Y–Y bond lengths are 3.52 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeY(GaPd2)2 by Materials Project

CeY(Pd2Ga)2 is delta Molybdenum Boride-derived structured and crystallizes in the orthorhombic Pmc2_1 space group. The structure is three-dimensional. Ce is bonded in a 11-coordinate geometry to eight Pd and three equivalent Ga atoms. There are a spread of Ce–Pd bond distances ranging from 3.04–3.28 Å. There are a spread of Ce–Ga bond distances ranging from 3.05–3.12 Å. Y is bonded in a 11-coordinate geometry to eight Pd and three equivalent Ga atoms. There are a spread of Y–Pd bond distances ranging from 3.05–3.27 Å. There are a spread of Y–Ga bond distances ranging from 3.05–3.11 Å. There are two inequivalent Pd sites. In the first Pd site, Pd is bonded in a 12-coordinate geometry to two equivalent Ce, two equivalent Y, and three Ga atoms. There are a spread of Pd–Ga bond distances ranging from 2.55–2.65 Å. In the second Pd site, Pd is bonded in a 12-coordinate geometry to two equivalent Ce, two equivalent Y, and three Ga atoms. There are a spread of Pd–Ga bond distances ranging from 2.55–2.67 Å. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to three equivalent Ce and six Pd atoms. In the second Ga site, Ga is bonded in a 9-coordinate geometry to three equivalent Y and six Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeY(MgNi4)2 by Materials Project

CeY(MgNi4)2 is Hexagonal Laves-derived structured and crystallizes in the trigonal R3m space group. The structure is three-dimensional. there are two inequivalent Mg sites. In the first Mg site, Mg is bonded in a 12-coordinate geometry to one Ce, three equivalent Y, and twelve Ni atoms. The Mg–Ce bond length is 3.04 Å. All Mg–Y bond lengths are 3.02 Å. There are three shorter (2.89 Å) and nine longer (2.90 Å) Mg–Ni bond lengths. In the second Mg site, Mg is bonded in a 12-coordinate geometry to three equivalent Ce, one Y, and twelve Ni atoms. All Mg–Ce bond lengths are 3.03 Å. The Mg–Y bond length is 3.02 Å. There are six shorter (2.89 Å) and six longer (2.90 Å) Mg–Ni bond lengths. Ce is bonded in a 12-coordinate geometry to four Mg and twelve Ni atoms. There are three shorter (2.89 Å) and nine longer (2.90 Å) Ce–Ni bond lengths. Y is bonded in a 12-coordinate geometry to four Mg and twelve Ni atoms. All Y–Ni bond lengths are 2.90 Å. There are four inequivalent Ni sites. In the first Ni site, Ni is bonded to three Mg, two equivalent Ce, one Y, and six Ni atoms to form a mixture of edge, corner, and face-sharing NiCe2YMg3Ni6 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.45–2.49 Å. In the second Ni site, Ni is bonded to three Mg, one Ce, two equivalent Y, and six Ni atoms to form a mixture of edge, corner, and face-sharing NiCeY2Mg3Ni6 cuboctahedra. There are a spread of Ni–Ni bond distances ranging from 2.45–2.49 Å. In the third Ni site, Ni is bonded to three equivalent Mg, three equivalent Y, and six Ni atoms to form NiY3Mg3Ni6 cuboctahedra that share corners with eighteen NiCe2YMg3Ni6 cuboctahedra, edges with six equivalent NiY3Mg3Ni6 cuboctahedra, and faces with eighteen NiCe2YMg3Ni6 cuboctahedra. In the fourth Ni site, Ni is bonded to three equivalent Mg, three equivalent Ce, and six Ni atoms to form NiCe3Mg3Ni6 cuboctahedra that share corners with eighteen NiCe2YMg3Ni6 cuboctahedra, edges with six equivalent NiCe3Mg3Ni6 cuboctahedra, and faces with eighteen NiCe2YMg3Ni6 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeY(AlPd)2 by Materials Project

CeY(PdAl)2 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. there are three inequivalent Ce sites. In the first Ce site, Ce is bonded in a 5-coordinate geometry to five Pd atoms. There are a spread of Ce–Pd bond distances ranging from 2.95–3.02 Å. In the second Ce site, Ce is bonded in a 5-coordinate geometry to five Pd atoms. There are a spread of Ce–Pd bond distances ranging from 2.95–3.03 Å. In the third Ce site, Ce is bonded in a 5-coordinate geometry to five Pd atoms. There are a spread of Ce–Pd bond distances ranging from 2.97–3.03 Å. There are three inequivalent Y sites. In the first Y site, Y is bonded in a 5-coordinate geometry to five Pd atoms. There are a spread of Y–Pd bond distances ranging from 2.99–3.01 Å. In the second Y site, Y is bonded in a 5-coordinate geometry to five Pd and six Al atoms. There are a spread of Y–Pd bond distances ranging from 2.98–3.03 Å. There are two shorter (3.23 Å) and four longer (3.31 Å) Y–Al bond lengths. In the third Y site, Y is bonded in a 5-coordinate geometry to five Pd atoms. There are three shorter (3.00 Å) and two longer (3.02 Å) Y–Pd bond lengths. There are six inequivalent Pd sites. In the first Pd site, Pd is bonded in a 9-coordinate geometry to four Ce, two equivalent Y, and three Al atoms. There are a spread of Pd–Al bond distances ranging from 2.81–2.84 Å. In the second Pd site, Pd is bonded in a 9-coordinate geometry to two equivalent Ce, four Y, and three Al atoms. There are two shorter (2.80 Å) and one longer (2.82 Å) Pd–Al bond lengths. In the third Pd site, Pd is bonded in a 9-coordinate geometry to four Ce, two equivalent Y, and three Al atoms. There are a spread of Pd–Al bond distances ranging from 2.81–2.83 Å. In the fourth Pd site, Pd is bonded in a 9-coordinate geometry to two equivalent Ce, four Y, and three Al atoms. There are a spread of Pd–Al bond distances ranging from 2.80–2.82 Å. In the fifth Pd site, Pd is bonded in a 9-coordinate geometry to two Ce, one Y, and six Al atoms. There are a spread of Pd–Al bond distances ranging from 2.66–2.69 Å. In the sixth Pd site, Pd is bonded in a 9-coordinate geometry to one Ce, two Y, and six Al atoms. There are two shorter (2.65 Å) and four longer (2.67 Å) Pd–Al bond lengths. There are six inequivalent Al sites. In the first Al site, Al is bonded in a 4-coordinate geometry to four Pd atoms. In the second Al site, Al is bonded in a 12-coordinate geometry to two equivalent Y and four Pd atoms. In the third Al site, Al is bonded in a 4-coordinate geometry to two equivalent Y and four Pd atoms. In the fourth Al site, Al is bonded in a 4-coordinate geometry to four Pd atoms. In the fifth Al site, Al is bonded in a 4-coordinate geometry to two equivalent Y and four Pd atoms. In the sixth Al site, Al is bonded in a 4-coordinate geometry to four Pd atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CeY(GePt)4 by Materials Project

CeY(PtGe)4 crystallizes in the triclinic P1 space group. The structure is three-dimensional. Ce is bonded in a 2-coordinate geometry to eight Pt and eight Ge atoms. There are a spread of Ce–Pt bond distances ranging from 3.24–3.40 Å. There are a spread of Ce–Ge bond distances ranging from 3.23–3.36 Å. Y is bonded in a 8-coordinate geometry to eight Pt and eight Ge atoms. There are a spread of Y–Pt bond distances ranging from 3.23–3.41 Å. There are a spread of Y–Ge bond distances ranging from 3.22–3.42 Å. There are four inequivalent Pt sites. In the first Pt site, Pt is bonded in a 5-coordinate geometry to four equivalent Y and five Ge atoms. There are a spread of Pt–Ge bond distances ranging from 2.43–2.52 Å. In the second Pt site, Pt is bonded in a 9-coordinate geometry to four equivalent Ce and five Ge atoms. There are a spread of Pt–Ge bond distances ranging from 2.46–2.53 Å. In the third Pt site, Pt is bonded in a 4-coordinate geometry to two equivalent Ce, two equivalent Y, and four Ge atoms. There are one shorter (2.55 Å) and three longer (2.56 Å) Pt–Ge bond lengths. In the fourth Pt site, Pt is bonded in a 4-coordinate geometry to two equivalent Ce, two equivalent Y, and four Ge atoms. There are one shorter (2.55 Å) and three longer (2.56 Å) Pt–Ge bond lengths. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to two equivalent Ce, two equivalent Y, and four Pt atoms. In the second Ge site, Ge is bonded in a 4-coordinate geometry to two equivalent Ce, two equivalent Y, and four Pt atoms. In the third Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Y and five Pt atoms. In the fourth Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Ce and five Pt atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2022

In Situ XAFS, XRD, and DFT Characterization of the Sulfur Adsorption Sites on Cu and Ce Exchanged Y Zeolites

Adsorptive desulfurization with Cu and Ce ion-exchanged Y zeolite (CuCeY) has proven to be an effective method for the removal of sulfur compounds from hydrocarbon fuels. In this study, Cu and Ce exchanged Y materials including CuY, CeY, and CuCeY were prepared and examined to investigate the mechanism behind the superior sulfur adsorption and selectivity of CuCeY. In situ conditions were used to study the materials as prepared for optimal desulfurization. X-ray diffraction (XRD) confirmed the absence of large well-ordered crystalline phases from metallic or oxide Cu and Ce after the reduction of the samples. The oxidation states and local environments of Cu and Ce were determined using X-ray adsorption fine structure (XAFS) analysis and correlated to theoretical findings obtained from density functional theory (DFT) calculations. XAFS data indicate the successful reduction of Cu species to Cu + and Cu o , and Ce to Ce 3+ . Analysis of XAFS spectra located Cu and Ce within the Y zeolite framework with Cu cations in the six-member ring sites and as small metallic Cu clusters. Ce cations were found to occupy both six-member ring and hexagonal prism sites. Furthermore, these results reveal the structure of CuCeY as prepared for desulfurization and provide insight into its superior sulfur adsorption performance.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗