Propene
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Geração de mesoporos em zeólitas ZSM-5 e seus efeitos na conversão do etanol em olefinas
Developing mesoporosity in HZSM-5 zeolites is an alternative for improving their catalytic performance on chemical reactions. In this work, alkaline and thermal treatments were used to produce mesoporosity. These treatments increased mesoporous area and volume. They also influenced the acid properties of the samples. Concerning catalytic performance, treatme
Quím. Nova. Publicado em: 2012
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2. Uso de modelagem molecular no estudo dos conceitos de nucleofilicidade e basicidade
Molecular modeling enables the students to visualize the abstract relationships underlying theoretical concepts that explain experimental data on the molecular and atomic levels. With this aim we used the free software "Arguslab 4.0.1" (semi-empirical method) to study the reaction of 1-chloropropane with ethoxide in solution, known to lead to methyl propyl e
Química Nova. Publicado em: 2011-09
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3. Transformação de metanol em olefinas leves catalisada por zeólitas HZSM-5 / Methanol transformation in to light olefins over HZSM-5 Zeolites
A reação de transformação de MeOH em olefinas leves foi investigada sobre zeólitas HZSM-5 com razões SiO2/Al2O3 (SAR) iguais a 30, 80 e 280. As propriedades ácidas e texturais da amostra com SAR 30 foram modificadas por impregnação com ácido fosfórico. A caracterização físico-química das amostras foi realizada empregando-se as técnicas de FRX
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2007
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4. SÃntese e caracterizaÃÃo de silicoaluminofosfatos para a produÃÃo de olefinas leves a partir do dimetilÃter
Methanol/dimethylether to olefin (MTO) process provides an additional route for production of ethylene and propylene for the chemical industry. This process has some advantages over the current ethylene and propylene production process, the steam cracking of liquefied natural gas, naphtha or other light fractions of petroleum, because MTO can provide a wider
Publicado em: 2007
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5. Modelos hibridos de colunas de destilação
Techniques like online process optimization and model predictive control require fast simulations of the process models used. However, in some cases the process models are very complex or have a high dimension. In these cases acceleration techniques that include order reduction and model simplification can be used to obtain fast enough simulations. Distillat
Publicado em: 2002
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6. Continuous degradation of trichloroethylene by Xanthobacter sp. strain Py2 during growth on propene.
Propene-grown Xanthobacter sp. strain Py2 cells can degrade trichloroethylene (TCE), but the transformation capacity of such cells was limited and depended on both the TCE concentration and the biomass concentration. Toxic metabolites presumably accumulated extracellularly, because the fermentation of glucose by yeast cells was inhibited by TCE degradation p
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7. Low stereoselectivity in methylacetylene and cyclopropene reductions by nitrogenase.
The stereochemistry of reductions catalyzed by nitrogenase in 2H2O has been investigated by using allene, methylacetylene, and cyclopropene as substrates. Deuterium labeling patterns in the reduction products were determined by mass spectroscopy, infrared spectroscopy, 2H-decoupled 220-MHz 1H NMR, and 1H-decoupled 30.7-MHz 2H NMR. Reduction of allene gave pu
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8. Oxidation of aliphatic olefins by toluene dioxygenase: enzyme rates and product identification.
Toluene dioxygenase from Pseudomonas putida F1 has been studied extensively with aromatic substrates. The present work examined the toluene dioxygenase-catalyzed oxidation of various halogenated ethenes, propenes, butenes and nonhalogenated cis-2-pentene, an isomeric mix of 2-hexenes, cis-2-heptene, and cis-2-octene as substrates for toluene dioxygenase. Enz
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9. A Lack of Specificity for Ethylene-induced Mitochondrial Changes 1
A critical evaluation was made of the hypothesis that the primary mode of action of ethylene in inducing physiological responses is by changing the permeability of cell organelles. The parameter investigated was the evaluation of the influence of ethylene and other gases on mitochondrial oxidation and swelling. Spectrometric evidence demonstrated that mitoch
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10. Ruminal Bacterial Degradation of Benzo(b)-thien-4-yl Methylcarbamate (Mobam) and Effect of Mobam on Ruminal Bacteria
Mixtures of ruminal bacteria degraded benzo(b)thien-4-yl methylcarbamate (Mobam) to 4-hydroxybenzothiophene, CO2, and polar product(s). The metabolite, 4-hydroxybenzothiophene, was identified (after acetylation) by comparative infrared and mass spectrometry with an authentic sample. Carbon dioxide and polar product(s) were produced by degradation of the meth
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11. Populations Implicated in Anaerobic Reductive Dechlorination of 1,2-Dichloropropane in Highly Enriched Bacterial Communities†
1,2-Dichloropropane (1,2-D), a widespread groundwater contaminant, can be reductively dechlorinated to propene by anaerobic bacteria. To shed light on the populations involved in the detoxification process, a comprehensive 16S rRNA gene-based bacterial community analysis of two enrichment cultures derived from geographically distinct locations was performed.
American Society for Microbiology.
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12. Monooxygenase-Mediated 1,2-Dichloroethane Degradation by Pseudomonas sp. Strain DCA1
A bacterial strain, designated Pseudomonas sp. strain DCA1, was isolated from a 1,2-dichloroethane (DCA)-degrading biofilm. Strain DCA1 utilizes DCA as the sole carbon and energy source and does not require additional organic nutrients, such as vitamins, for optimal growth. The affinity of strain DCA1 for DCA is very high, with a Km value below the detection
American Society for Microbiology.