Global ETD Search
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Showing 1 to 7 of 7 for “"bronsted acid sites"”.
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Desilicated ZSM-5 zeolite as catalyst for the dehydration of ethanol
… desilication results in a higher density of acid sites as shown in the following. $\sp1$H MAS NMR studies were done on anhydrous samples of desilicated ZSM-5 and have detected a signal which was not observed for the parent sample and is believed to arise from the interaction of Bronsted acid …
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Functional Metal Phosphonates
… variations which exposed potentially active sites within the materials, including both Lewis acidic and basic sites, as well as Bronsted acid sites. The first strategy was employed in the design of tetravalent metal phosphonates which have covalently incorporated bipyridine moieties. The …
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Catalytic, low temperature oxidation of methane into methanol over copper-exchanged zeolites
… not catalytic; 3) there are few active sites and methanol yield is low. This work addresses all three shortcomings. First, a new reaction pathway is identified for methane oxidation in copper-exchanged mordenite zeolites using tandem methane oxidation and Koch carbonylation reactions. …
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Molybdenum trioxide and molybdenum carbide as promising hydrodeoxygenation catalysts for biomass conversion
… C-0 bond, likely due to the presence of Bronsted acid sites. To gain insights into the surface active sites, operando near-ambient XPS is employed during HDO and this technique revealed that HDO seems to operate via distinct active sites over both these materials. Finally, Mo2C is shown …
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Understanding the Structure-Property Relationships of Highly Well-Defined Metal Nodes over MIL-100(Cr) and its Derivatives
… such as the distribution of heteroatom sites, the low percentage of metal loading, or the interference of metal aggregation, which make it difficult to understand the reaction properties and to control over the active site coordination environment within the pore systems. Metal-organic …
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Development of zeolite based acid catalysts for the synthesis of methyl tertiary butyl ether
… industrially from methanol and isobutene over an acidic ion-exchange resin Amberlyst-15. This commercial catalyst, although very active, still suffers from several drawbacks such as thermal instability, acid leaching, and need of a high methanol over isobutene ratio. Zeolites for their higher …
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Spectroscopic and Kinetic Study of Copper-Exchanged Zeolites for the Selective Catalytic Reduction of NOx with Ammonia
… to form. Additionally, the number of Brønsted acid sites was determined to not track with the standard SCR rate per gram, indicating the kinetically relevant steps in these samples took place on the Cu.</p> <p>The active state of the isolated Cu was also explored. Under reaction conditions, our …