The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Gabor A Somorjai - One of the best experts on this subject based on the ideXlab platform.
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heinz heinemann s legacy at exxonmobil an illustrious career in industrial catalysis
Catalysis Letters, 2009Co-Authors: Thomas F Degnan, Nai Y Chen, Gabor A SomorjaiAbstract:Heinz Heinemann contributed significantly to the field of heterogeneous catalysis over his 60 year career. As a scientist and later Catalysis Research Manager at ExxonMobil’s (then Mobil’s) Princeton Laboratory, he oversaw the development of many of the ZSM-5 processes for fuels and chemicals, most notably, a post-reforming process known as M-Forming. The M-Forming process development program justified Mobil’s commercial development of ZSM-5, which in turn led to the rapid development of many other ZSM-5 processes including Methanol-to-Gasoline, Middle Distillate Dewaxing, xylene isomerizaion, and lubes Dewaxing.
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Heinz Heinemann’s Legacy at ExxonMobil: An Illustrious Career in Industrial Catalysis
Catalysis Letters, 2009Co-Authors: Thomas F Degnan, Nai Y Chen, Gabor A SomorjaiAbstract:Heinz Heinemann contributed significantly to the field of heterogeneous catalysis over his 60 year career. As a scientist and later Catalysis Research Manager at ExxonMobil’s (then Mobil’s) Princeton Laboratory, he oversaw the development of many of the ZSM-5 processes for fuels and chemicals, most notably, a post-reforming process known as M-Forming. The M-Forming process development program justified Mobil’s commercial development of ZSM-5, which in turn led to the rapid development of many other ZSM-5 processes including Methanol-to-Gasoline, Middle Distillate Dewaxing, xylene isomerizaion, and lubes Dewaxing.
Paul Ratnasamy - One of the best experts on this subject based on the ideXlab platform.
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The influence of physicochemical properties of ZSM-5 on catalytic Dewaxing
Journal of Chemical Technology & Biotechnology, 2007Co-Authors: Subramanian Sivasanker, K. J. Waghmare, K. M. Reddy, A. N. Kothasthane, Paul RatnasamyAbstract:A decrease in the crystallite size increases the activity as well as the selectivity and reduces the deactivation of ZSM-5 zeolites in the Dewaxing of petroleum fractions. Isomorphous replacement of Al 3+ by Fe 3+ reduces the Dewaxing activity but enhances the yield of dewaxed oil and gasoline at the expense of C 1 -C 4 gases. Within limits, the Si/Al ratio does not affect the performance of ZSM-5 zeolite in the hydroDewaxing process.
BRUCE P PELRINE - One of the best experts on this subject based on the ideXlab platform.
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The Deactivation of ZSM-5 in Catalytic Dewaxing
Studies in Surface Science and Catalysis, 1991Co-Authors: N Y Chen, J.d. Lutner, Thomas F. Jr. Degnan, BRUCE P PELRINEAbstract:Abstract The deactivation profiles (reaction temperature vs time-on-stream) of ZSM-5 based lube Dewaxing catalysts are highly dependent on the properties of the feedstock. A model which adequately describes the deactivation profiles of a wide range of waxy lube basestocks is presented. Application of this model to various feedstock deactivation data indicates that for each feedstock the shape of the deactivation profile is related to the ratio of the apparent activation energy for the Dewaxing reaction to that of catalyst deactivation. Empirical model parameters also suggest that the Dewaxing and catalyst deactivation reactions may both be highly diffusion limited.
Govind V Kaigala - One of the best experts on this subject based on the ideXlab platform.
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tissue lithography microscale Dewaxing to enable retrospective studies on formalin fixed paraffin embedded ffpe tissue sections
PLOS ONE, 2017Co-Authors: Julien F Cors, Aditya Kashyap, Anna Fomitcheva Khartchenko, Peter Schraml, Govind V KaigalaAbstract:We present a new concept, termed tissue lithography (TL), and its implementation which enables retrospective studies on formalin-fixed paraffin-embedded tissue sections. Tissue lithography uses a microfluidic probe to remove microscale areas of the paraffin layer on formalin-fixed paraffin-embedded biopsy samples. Current practices in sample utilization for research and diagnostics require complete deparaffinization of the sample prior to molecular testing. This imposes strong limitations in terms of the number of tests as well as the time when they can be performed on a single sample. Microscale Dewaxing lifts these constraints by permitting deprotection of a fraction of a tissue for testing while keeping the remaining of the sample intact for future analysis. After testing, the sample can be sent back to storage instead of being discarded, as is done in standard workflows. We achieve this microscale Dewaxing by hydrodynamically confining nanoliter volumes of xylene on top of the sample with a probe head. We demonstrate micrometer-scale, chromogenic and fluorescence-based immunohistochemistry against multiple biomarkers (p53, CD45, HER2 and β-actin) on tonsil and breast tissue sections and microarrays. We achieve stain patterns as small as 100 μm × 50 μm as well as multiplexed immunostaining within a single tissue microarray core with a 20-fold time reduction for local Dewaxing as compared to standard protocols. We also demonstrate a 10-fold reduction in the rehydration time, leading to lower processing times between different stains. We further show the potential of TL for retrospective studies by sequentially Dewaxing and staining four individual cores within the same tissue microarray over four consecutive days. By combining tissue lithography with the concept of micro-immunohistochemistry, we implement each step of the IHC protocol-Dewaxing, rehydration and staining-with the same microfluidic probe head. Tissue lithography brings a new level of versatility and flexibility in sample processing and budgeting in biobanks, which may alleviate current sample limitations for retrospective studies in biomarker discovery and drug screening.
Sarojrani Pattnaik - One of the best experts on this subject based on the ideXlab platform.
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developments in investment casting process a review
Journal of Materials Processing Technology, 2012Co-Authors: Sarojrani Pattnaik, Benny D KarunakarAbstract:Abstract Investment casting has been used to manufacture weapons, jewellery and art castings during the ancient civilization. Today, its applications include jewellery/art castings, turbine blades and many more industrial/scientific components. The present paper reviews various investigations made by researchers in different stages of investment casting and highlights their importance. The paper initially highlights the investigations made on pattern wax properties, effects of blending, additives and fillers. Different ways through which pattern properties (like surface finish, dimensional accuracy, etc.) could be enhanced by properly controlling the injection processing parameters are thoroughly discussed. The paper also looks into the investigations made to enhance the strength, surface finish, etc. of ceramic shell for ferrous alloys/non-ferrous alloys as well as superalloys in investment casting. Investigations made on incorporation of nylon fibers and polymer additions confirm that a ceramic shell reinforced with nylon fibers attains additional permeability compared to the one with polymer additions. Different investigations carried out on autoclave Dewaxing and microwave Dewaxing conclude that the wax properties are less altered with microwave Dewaxing when compared to an autoclave Dewaxing. Some recent investigations carried out on pouring and post-treatment operations are also discussed in the paper. The advent and emergence of rapid prototyping in investment casting are broadly exposed in the subsequent sections of the paper. Various aspects of rapid prototyping like rapid investment casting, rapid freeze prototyping, etc., along with their advantages are projected. The emerging areas of applications of rapid prototyping like dentistry, etc., are duly discussed.
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Developments in investment casting process—A review
Journal of Materials Processing Technology, 2012Co-Authors: Sarojrani Pattnaik, D. Benny KarunakarAbstract:Abstract Investment casting has been used to manufacture weapons, jewellery and art castings during the ancient civilization. Today, its applications include jewellery/art castings, turbine blades and many more industrial/scientific components. The present paper reviews various investigations made by researchers in different stages of investment casting and highlights their importance. The paper initially highlights the investigations made on pattern wax properties, effects of blending, additives and fillers. Different ways through which pattern properties (like surface finish, dimensional accuracy, etc.) could be enhanced by properly controlling the injection processing parameters are thoroughly discussed. The paper also looks into the investigations made to enhance the strength, surface finish, etc. of ceramic shell for ferrous alloys/non-ferrous alloys as well as superalloys in investment casting. Investigations made on incorporation of nylon fibers and polymer additions confirm that a ceramic shell reinforced with nylon fibers attains additional permeability compared to the one with polymer additions. Different investigations carried out on autoclave Dewaxing and microwave Dewaxing conclude that the wax properties are less altered with microwave Dewaxing when compared to an autoclave Dewaxing. Some recent investigations carried out on pouring and post-treatment operations are also discussed in the paper. The advent and emergence of rapid prototyping in investment casting are broadly exposed in the subsequent sections of the paper. Various aspects of rapid prototyping like rapid investment casting, rapid freeze prototyping, etc., along with their advantages are projected. The emerging areas of applications of rapid prototyping like dentistry, etc., are duly discussed.