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Dive into the research topics where Padmesh Venkitasubramanian is active.

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Featured researches published by Padmesh Venkitasubramanian.


Journal of the American Oil Chemists' Society | 2011

Direct Determination of MCPD Fatty Acid Esters and Glycidyl Fatty Acid Esters in Vegetable Oils by LC–TOFMS

Troy D. Haines; Kevin J. Adlaf; Robert M. Pierceall; Inmok Lee; Padmesh Venkitasubramanian; Mark W. Collison

Analysis of MCPD esters and glycidyl esters in vegetable oils using the indirect method proposed by the DGF gave inconsistent results when salting out conditions were varied. Subsequent investigation showed that the method was destroying and reforming MCPD during the analysis. An LC time of flight MS method was developed for direct analysis of both MCPD esters and glycidyl esters in vegetable oils. The results of the LC–TOFMS method were compared with the DGF method. The DGF method consistently gave results that were greater than the LC–TOFMS method. The levels of MCPD esters and glycidyl esters found in a variety of vegetable oils are reported. MCPD monoesters were not found in any oil samples. MCPD diesters were found only in samples containing palm oil, and were not present in all palm oil samples. Glycidyl esters were found in a wide variety of oils. Some processing conditions that influence the concentration of MCPD esters and glycidyl esters are discussed.


Journal of the American Chemical Society | 2016

Key Roles of Lewis Acid-Base Pairs on ZnxZryOz in Direct Ethanol/Acetone to Isobutene Conversion

Junming Sun; Rebecca A. L. Baylon; Chang-jun Liu; Donghai Mei; Kevin Martin; Padmesh Venkitasubramanian; Yong Wang

The effects of surface acidity on the cascade ethanol-to-isobutene conversion were studied using ZnxZryOz catalysts. The ethanol-to-isobutene reaction was found to be limited by the secondary reaction of the key intermediate, acetone, namely the acetone-to-isobutene reaction. Although the catalysts with coexisting Brønsted acidity could catalyze the rate-limiting acetone-to-isobutene reaction, the presence of Brønsted acidity is also detrimental. First, secondary isobutene isomerization is favored, producing a mixture of butene isomers. Second, undesired polymerization and coke formation prevail, leading to rapid catalyst deactivation. Most importantly, both steady-state and kinetic reaction studies as well as FTIR analysis of adsorbed acetone-d6 and D2O unambiguously showed that a highly active and selective nature of balanced Lewis acid-base pairs was masked by the coexisting Brønsted acidity in the aldolization and self-deoxygenation of acetone to isobutene. As a result, ZnxZryOz catalysts with only Lewis acid-base pairs were discovered, on which nearly a theoretical selectivity to isobutene (∼ 88.9%) was successfully achieved, which has never been reported before. Moreover, the absence of Brønsted acidity in such ZnxZryOz catalysts also eliminates the side isobutene isomerization and undesired polymerization/coke reactions, resulting in the production of high purity isobutene with significantly improved catalyst stability (<2% activity loss after 200 h time-on-stream). This work not only demonstrates a balanced Lewis acid-base pair for the highly active and selective cascade ethanol-to-isobutene reaction but also sheds light on the rational design of selective and robust acid-base catalyst for C-C coupling via aldolization reaction.


Journal of the American Oil Chemists' Society | 2011

Direct Determination of Glycidyl Esters of Fatty Acids in Vegetable Oils by LC–MS

Michael R. Blumhorst; Padmesh Venkitasubramanian; Mark W. Collison

An LC–MS method using a single quadrupole mass spectrometer was developed for direct analysis of glycidyl esters of fatty acids in vegetable oils. Without any sample clean-up, this method provided acceptable recovery of seven glycidyl esters, comparable results to a previously-published method utilizing two solid-phase extraction steps, and consistent detection parameters after greater than 200 injections without any cleaning operations performed. This method could readily be implemented as a screening assay for glycidyl esters in most oil laboratories.


Archive | 2008

Monomers and polymers from bioderived carbon

Paul D. Bloom; Padmesh Venkitasubramanian


ACS Sustainable Chemistry & Engineering | 2016

Optimization of Co/Mn/Br-Catalyzed Oxidation of 5-Hydroxymethylfurfural to Enhance 2,5-Furandicarboxylic Acid Yield and Minimize Substrate Burning

Xiaobin Zuo; Padmesh Venkitasubramanian; Daryle H. Busch; Bala Subramaniam


Chemical Communications | 2016

Beyond ketonization: selective conversion of carboxylic acids to olefins over balanced Lewis acid–base pairs

Rebecca A. L. Baylon; Junming Sun; Kevin Martin; Padmesh Venkitasubramanian; Yong Wang


Archive | 2012

PROCESSES FOR MAKING ACRYLIC-TYPE MONOMERS AND PRODUCTS MADE THEREFROM

Padmesh Venkitasubramanian


Archive | 2012

SPRAY OXIDATION PROCESS FOR PRODUCING 2,5-FURANDICARBOXYLIC ACID FROM HYDROXYMETHYLFURFURAL

Bala Subramaniam; Xiaobin Zuo; Daryle Busch; Padmesh Venkitasubramanian


Archive | 2013

Esterification of 2,5-furan-dicarboxylic acid

Kenneth Stensrud; Padmesh Venkitasubramanian


Archive | 2015

HYDROGENATION PRODUCTS FROM BIOLOGICALLY-DERIVED CARBOXYLIC-ACID ESTERS

Kenneth Stensrud; Padmesh Venkitasubramanian

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Junming Sun

Washington State University

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Yong Wang

Archer Daniels Midland

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Changjun Liu

Washington State University

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Colin Smith

Washington State University

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