Cheng-Yu Wang successfully defends his PhD thesis!

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Cheng-Yu Wang successfully defended his PhD thesis, "Hydrogen Storage in Zinc and Copper Types of Metal-Organic Frameworks via Hydrogen Spillover" on July 25, 2014. 

He had an amazing number of only three minor edit requests, and one suggested addition to future work.  Great job Cheng-Yu!

Cheng-Yu Wang's paper accepted to J. Catal.

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Cheng-Yu Wang's paper, "Stability and Hydrogen Adsorption of Metal-Organic Frameworks Prepared via Different Catalyst Doping Methods" was accepted to the Journal of Catalysis.  Congratulations Cheng-Yu!

Co-Authors are:  Cheng-Yu Wang; Qihan Gong; Yonggang Zhao; Jing Li; Angela Lueking

 

It's a pleasure to inform you that you have been selected for a 2014 Annual Recognition from the Penn State Commission for Adult Learners.  Your recommendation was based on your personalized support of adult undergraduate learners and was submitted by Elizabeth N. Timblin.

 

The Commission for Adult Learners Annual Recognitions showcase commendable services Penn State staff and faculty provide to adult learners university-wide.  To acknowledge successful approaches to working with adult learners and to encourage others to replicate effective strategies, leaders of projects, practices or singular successes are highlighted each year at the Hendricks Best Practices Conference and on the Commission's website repository. 

Sarmishtha Sircar successfully defends her PhD thesis!

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Sarmistha Sircar successfully defended her PhD thesis on December 19, 2013.  Congratulations Sarmishtha, and happy editing.  :)
Angela will join the University of Nebraska-Lincoln Chemical and Biomolecular Engineering Advisory Board starting next year!  I hope the meeting is arranged about the Nebraska-Penn State or Nebraska-Michigan football game.

Investigations into Compressive Gas Storage in Carbon Cages

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A Poster Presentation at the DOE-BES Synthesis/Processing PI Meeting in Gaithersburg, MD, 11/19/2013

Co-Authors:  Enshi Xu, Kathleen Maleski, Angela Lueking, Vin Crespi, George Froudakis

Abstract:

Cheng-Yu Wang presents at AIChE annual meetingPrebridge Technique to Incorporate Transition 

Co-Authors:  Qihan Gong, Jing Li, Angela Lueking

 

Abstract:  Metal-organic frameworks, high surface area materials with the characteristics of adjustable structure and surface chemistry, are becoming promising candidates for hydrogen storage, gas separation, and catalyst supports.  In this paper, we explore MOF stability after various catalytic doping methods for IRMOF-8, Cu-BTC, and Cu-TDPAT.  After identifying a catalytic doping technique that maximizes stability and retains the surface area of the MOF precursor, we measure hydrogen isotherms at 300K up to 80 bar, and demonstrate catalyst addition significantly increases hydrogen storage via the hydrogen spillover effect.  Adsorption enhancement is most pronounced at low pressure, and kinetic limitations and MOF instability effects inhibit high-pressure adsorption via the spillover effect.  Novel hydrogen chemisorption sites are identified using spectroscopic techniques, for both undoped and doped MOFs.  An improved mechanistic understanding of the hydrogen spillover effect is developed by tracking of hydrogenation of N groups via spectroscopy, density functional theory, and comparison of defected versus pristine MOF structures.  Implications for hydrogen storage and use of MOFs as a catalyst support are discussed.

 

Co-authors are Cheng Yu Wang and Angela Lueking.

Abstract:  ABSTRACT

 

High pressure adsorption measurements for light gases on volumetric equipment are prone to error. Differential units reduce the sensitivity to leakage, gas compressibility, and temperature gradients, but remain highly sensitive to volume uncertainties, the calibration of which is difficult in the presence of low-density, microporous samples. Calibration error can be reduced using a high initial pressure differential and large calibration volume; however, systematic error is prevalent in the literature. Using both analytical and multivariate error analysis, we demonstrate that calibration of the differential unit with the differential pressure transducer significantly decreases volume sensitivity. We show that hydrogen adsorption to GX-31 superactivated carbon at 298K and 80 bar can be measured with a 7% error in measurement (i.e. within 0.05 wt% for a 100mg sample), even when experimental volume calibration is determined only within ~1%. This represents approximately a 2-7 fold increase in sensitivity relative to previous reports using differential measurements for large versus smaller system volumes. We also provide a framework for optimizing the design of a volumetric adsorption unit. For virtually any system design, the improved differential methods offer a significant increase in precision relative to the conventional volumetric measurement (from 10- to over 250-fold, depending on the precision of the pressure transducer). This improvement further enhances advantages of the differential unit, in addition to advantages that arise for treating gas compressibility and temperature fluctuations.

View the full paper here:  http://link.springer.com/article/10.1007%2Fs10450-013-9558-8

Full citation:  Sircar, Sarmishtha; Wang, Cheng-Yu; Lueking, Angela D. ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY  Volume: 19   Issue: 6   Pages: 1211-1234   DOI: 10.1007/s10450-013-9558-8   Published: DEC 2013

Cheng-Yu Wang presents at AMR

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Cheng-Yu Wang successfully presented a poster at the Annual Merit Review in Washington DC on May 15.  Congratulations on a successful presentation Cheng Yu!

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