D. Delgado Vigil

Centro de Investigación en Materiales Avanzados

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Alejandro López‐Ortiz

Centro de Investigación en Materiales Avanzados

V. Collins-Martı́nez

Centro de Investigación en Materiales Avanzados

Jesús Salinas Gutiérrez

Centro de Investigación en Materiales Avanzados

Daniel Jimenez

Johns Hopkins University

Daniel Lardizábal‐Gutiérrez

Centro de Investigación en Materiales Avanzados

N. P. Bigelow

University of Rochester

Brahim Dkhil

Centre National de la Recherche Scientifique

Jan Kleinert

MKS Instruments (United States)

V. Guzmán Velderrain

Centro de Investigación en Materiales Avanzados

D. Viehland

Virginia Tech

Cooperative Institutions

Centro de Investigación en Materiales Avanzados

University of Rochester

Energetics (United States)

University of Illinois Urbana-Champaign

Max Planck Institute for Nuclear Physics

Max Planck Society

Urbana University

Iowa State University

Johns Hopkins University

University of Baltimore

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Trapping cold polar molecules on chips

Nuclear Physics A (2007)

N. P. Bigelow D. Delgado Vigil M. Tscherneck Jan Kleinert C. Haimberger

Chemical polarity

Trap (plumbing)

Realization (probability)

10.1016/j.nuclphysa.2007.03.119

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Direct Pore-Level Observation of Permeability Increase by Seismic Waves

AGUFM (2011)

Igor A. Beresnev William Gaul D. Delgado Vigil

Source

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Li Promoted Sodium Zirconates as High Temperature Absorbent

Journal of New Materials for Electrochemical Systems (2010)

V. Guzmán Velderrain Daniel Jimenez Daniel Lardizábal‐Gutiérrez D. Delgado Vigil Jesús Salinas Gutiérrez

Previous studies reported that Na2ZrO3 exhibited better high temperature CO2 capture features than other Li-base materials towards its use in hydrogen production. This work is aimed to increase Na2ZrO3 absorption capacity by the addition of Li. Na2ZrO3 was synthesized by solid-state reaction and impregnated with LiNO3 at different Li/Na molar ratios: 0, 0.03, 0.05, 0.1 and 0.25. Characterization consisted in XRD and SEM. Absorbents were evaluated by TGA at 600 °C, 80 % CO2/Ar (absorption) and 800 °C, air (regeneration). XRD results found the Na2ZrO3 structure in all samples. However, Li promoted samples presented substitution of Na by Li in the Na2ZrO3 structure. According to TGA, absorption/regeneration kinetics was not modified by the effect of Li. Instead, CO2 capture capacity increased with Li content up to a limit between 10 to 25 % mol. This was attributed to formation of Na4ZrO4 type structures, which can be responsible of the increase in capture capacity.

Molar ratio

Base (topology)

10.14447/jnmes.v13i3.173

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Stability of glassy and ferroelectric states in the relaxorsPbMg1∕3Nb2∕3O

Physical Review B (2007)

Eugene V. Colla D. Delgado Vigil John Timmerwilke M. B. Weissman D. Viehland

The stability of the disordered glassy phase in the relaxors PbMg1/3Nb2/3O3 and (PbMg1/3Nb2/3O3)0.88(PbTiO3)0.12, called PMN and PMN-PT, was investigated by preparing partially polarized samples and allowing them to age at zero field in the temperature range for which the phase is history-dependent. The PMN-PT polarization would spontaneously increase until long-range order formed, first appearing as giant polarization noise. Thus the thermodynamically stable phase in PMN-PT appears to be ferroelectric. In contrast, a PMN sample lacking the sharp first-order field-driven transition found in some other samples spontaneously depolarized, consistent with its glassy state being thermodynamically stable. Detailed thermal depolarization results in PMN show two distinct broad peaks as well as a small fraction of material with a distribution of abrupt melting transitions.

10.1103/physrevb.75.214201

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Citations (17)

Synthesis Gas Production by Methane Partial Oxidation on Ni/Fe3O4-Ce0.75Zr0.25O2 Catalysts: Kinetic Study

Journal of New Materials for Electrochemical Systems (2011)

Maria Isela Sosa Vazquez Jesús Salinas Gutiérrez D. Delgado Vigil V. Collins-Martı́nez Alejandro López‐Ortiz

Fe3O4-Ce0.75Zr0.25O2 (FeCZ) is an oxygen carrier material aimed to produce syngas through methane partial oxidation in absence of oxygen gas feed. The objective of the present research is to study the catalytic effect of Ni on FeCZ using an evaluation of the global kinetics (activation energy, reaction rate, order and constant) of its reaction with methane for syngas production. FeCZ and 0.05NiFeCZ (Ni/Fe = 0.05 molar ratio) were synthesized through co-precipitation of their precursor nitrate salts, while 2NiFeCZ was prepared by impregnation of FeCZ with a nickel nitrate solution to obtain a 2 %W Ni material. Samples were calcined at 950°C during 4 hours in air. Kinetic study of oxygen carriers (FeCZ, 0.05NiFeCZ and 2NiFeCZ) reduction with methane was followed through thermogravimetric analysis (TGA) at 5, 7.5 and 10% CH4/Ar and 600, 650 and 700°C. Initial reaction rate was obtained from the slope of the linear region of the weight change signal as a function of time. Results indicate a first order global reaction rate for all materials. Activation energies for samples FeCZ, 0.05NiFeCZ and 2NiFeCZ were 52.2, 39.5 and 28.3 Kcal/mol, respectively. Thus, reflecting the catalytic effect of Ni over the FeCZ global reaction rate.

Thermogravimetric analysis

Partial oxidation

Partial pressure

10.14447/jnmes.v14i2.122

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Citations (1)