Zobrazeno 1 - 10
of 64
pro vyhledávání: '"Max P. McDaniel"'
Publikováno v:
Journal of Catalysis. 394:451-464
The Phillips Cr(VI)/silica catalyst, used worldwide to manufacture polyethylene, must first be reduced and alkylated to display polymerization activity. This is accomplished commercially by exposure to ethylene, in a reaction that is still uncertain
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::075fe6245385abd46370b7c2773b1fa2
https://doi.org/10.1016/j.jcat.2020.10.019
https://doi.org/10.1016/j.jcat.2020.10.019
Autor:
Friederike C. Jentoft, Jincy Joseph, Matthew J. Wulfers, Schwerdtfeger Eric D, Kelsey C. Potter, Max P. McDaniel
Publikováno v:
Journal of Catalysis. 377:550-564
The organic products of the reaction between Cr(VI)/silica and ethylene, propene, 2-pentene, 1-hexene, or cyclohexene at temperatures between 25 and 150 °C were investigated to understand the formation of chromium sites active for polymerization. A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::51b27c385e61ea1015c526bcb607fa14
https://doi.org/10.1016/j.jcat.2019.07.057
https://doi.org/10.1016/j.jcat.2019.07.057
Publikováno v:
Macromolecules. 52:5750-5760
Upon contact with ethylene, the Phillips Cr/silica catalyst must self-alkylate before polymerization can begin. How this happens has been a mystery for over 60 years, being not only of scientific i...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::655351d83359d6bbab98b069a92b0e7e
https://doi.org/10.1021/acs.macromol.9b00588
https://doi.org/10.1021/acs.macromol.9b00588
Autor:
Max P. McDaniel, Steve L. Kelly
Publikováno v:
Applied Catalysis A: General. 554:88-94
Ethyl silicate oligomers were impregnated into a generic Phillips Cr/silica catalyst used commercially for ethylene polymerization. After calcination, this treatment results in a secondary deposition of silica into the original silica matrix, which c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::854f58321115f999e3d44bc1f48b2e3f
https://doi.org/10.1016/j.apcata.2018.01.032
https://doi.org/10.1016/j.apcata.2018.01.032
Publikováno v:
ACS Catalysis. 8:725-737
Long-chain branch (LCB) formation was measured in polyethylene homopolymers and 1-hexene–ethylene copolymers made using a variety of metallocene and chromium catalysts while the reaction ethylene concentration was varied. Kinetic analysis of this d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29a1ba5daa49472531a0ed2ecb08a813
https://doi.org/10.1021/acscatal.7b03267
https://doi.org/10.1021/acscatal.7b03267
Autor:
Max P. McDaniel
Publikováno v:
Applied Catalysis A: General. 542:392-410
More than any other parameter, the calcination process is capable of modifying the performance of the Cr/silica catalyst system (also known as Phillips-type catalysts) to generate activity and to influence the diverse active population in order to pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::227d9c41dd23637047b26d3cb79a03ce
https://doi.org/10.1016/j.apcata.2016.12.001
https://doi.org/10.1016/j.apcata.2016.12.001
Autor:
Schwerdtfeger Eric D, Max P. McDaniel, Kelsey C. Potter, Friederike C. Jentoft, Connor W. Beckerle
Publikováno v:
Journal of Catalysis. 344:657-668
The adsorption, reaction and desorption of ethylene or hexenes on Cr(VI)/SiO2 containing 1 or 3 wt.% chromium were monitored by thermogravimetry, differential scanning calorimetry and mass spectrometry. Reaction of Cr(VI)/SiO2 with ethylene at a temp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c12c4c7d9d3a1b29a3004cb13060344
https://doi.org/10.1016/j.jcat.2016.10.031
https://doi.org/10.1016/j.jcat.2016.10.031
Publikováno v:
Journal of Catalysis. 314:109-116
The “comonomer effect” is a curious phenomenon in which the rate of ethylene polymerization is significantly enhanced by the addition of a small amount of α-olefin comonomer. The response is surprising because α-olefins incorporate into polyeth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4913fc9ea3852412e378fc97a058de62
https://doi.org/10.1016/j.jcat.2014.04.002
https://doi.org/10.1016/j.jcat.2014.04.002
Autor:
Max P. McDaniel
Publikováno v:
MRS Bulletin. 38:234-238
The state of Phillips Cr/silica catalyst technology is discussed in this article, including recent advances in the science and also economic and environmental challenges to its continued viability. Although these catalysts have often been described a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6832d36f517073e74cb683374488354d
https://doi.org/10.1557/mrs.2013.48
https://doi.org/10.1557/mrs.2013.48