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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 1,081 records · Page 60
All sourcesNASA NTRSDOE OSTI
DOE OSTI2016

Putting chromium on the map for N 2 reduction: production of hydrazine and ammonia. A study of cis -M(N 2 ) 2 (M = Cr, Mo, W) bis(diphosphine) complexes

The first complete structurally and spectroscopically characterized series of isostructural Group 6 N 2 complexes is reported in this paper. Protonolysis experiments on cis-[M(N 2 ) 2 (P Et N R P Et ) 2 ] (M = Cr, Mo, W; R = 2,6-difluorobenzyl) reveal that only Cr affords N 2 H 5 + and NH 4 + from the reduction of the N 2 ligands.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗
DOE OSTI2019

Enhancing Electrocatalysis for Hydrogen Production over CoP Catalyst by Strain: A Density Functional Theory Study

The facet-dependent strain effects on the hydrogen evolution reaction catalyzed by CoP were studied using density functional theory methods. We show that both atomic and electronic effects need to be taken into consideration to understand the strain effects. For the (111) surface, tensile strain promotes hydrogen evolution at all the levels of hydrogen coverage. For the (101) surface, a moderate tensile strain of ~3% endows this facet with optimum performance.

Liu, Fanghan↗
DOE OSTI2024

Production of drop-in biodiesel blendstocks via competitive acid-catalyzed dehydration reactions using ethanol oligomerization products

Ethanol can be converted into diesel fuel ethers using a three-step catalytic approach that involves ethanol oligomerization to larger alcohols, hydrogenolysis of the esters followed by dehydration of the C4 to C8 alcohols into ethers. In this paper we report results for the dehydration of a mixture of C4 – C8 alcohols using a zeolite Y catalyst in a continuous flow reactor. Mono-molecular dehydration of the alcohols produces olefins while bi-molecular dehydration of the alcohol produces ethers. Increasing the pressure increases the ether selectivity while decreasing the pressure produces more olefins. Linear alcohol feeds produce more C8+ ethers, while branched and secondary alcohols lead to more olefins. Olefin and coke selectivities increase with increasing carbon chain length of alcohols. Secondary alcohols lead to higher coke selectivities. Furthermore, ethanol/Butanol oligomerization experiments showed that the incoming dehydration feedstock can be grown to larger C6+ alcohol fractions, leading to higher yields of C10+ diesel-range ethers.

09 BIOMASS FUELS↗