Publications by authors named "Shin-ichiro Miyahara"
An important part of realizing a carbon-neutral society using ammonia will be the development of an inexpensive yet efficient catalyst for ammonia synthesis under mild reaction conditions (<400 °C, <10 MPa). Here, we report Fe/K(3)/MgO, fabricated via an impregnation method, as a highly active catalyst for ammonia synthesis under mild reaction conditions (350 °C, 1.0 MPa).
View Article and Find Full Text PDFRuthenium catalysts may allow for realization of renewable energy-based ammonia synthesis processes using mild reaction conditions (<400 °C, <10 MPa). However, ruthenium is relatively rare and therefore expensive. Here, we report a Co nanoparticle catalyst loaded on a basic Ba/LaO support and prereduced at 700 °C (Co/Ba/LaO_700red) that showed higher ammonia synthesis activity at 350 °C and 1.
View Article and Find Full Text PDFArticle Synopsis
- Ammonia is crucial for fertilizer production and energy storage, but the conventional Haber-Bosch process is energy-intensive, highlighting the need for efficient catalysts.
- A new catalyst, Ru/LaCeO pre-reduced at 650 °C, showed impressive ammonia synthesis rates at mild conditions, achieving up to 44.4 mmol g h at 3.0 MPa and 350 °C without hydrogen poisoning.
- The effectiveness of this catalyst is attributed to fine Ru particles interacting with LaCeO, which helps weaken the nitrogen bond, thereby facilitating its cleavage, a key step in ammonia production.
Ammonia is a crucial chemical feedstock for fertilizer production and is a potential energy carrier. However, the current method of synthesizing ammonia, the Haber-Bosch process, consumes a great deal of energy. To reduce energy consumption, a process and a substance that can catalyze ammonia synthesis under mild conditions (low temperature and low pressure) are strongly needed.
View Article and Find Full Text PDFBackground/aims: The mechanisms underlying neurological deterioration in patients with acute lacunar infarction in the lenticulostriate artery (LSA) territory are currently unclear. We aimed to identify predictors for progressive neurological deficits using diffusion-weighted imaging (DWI).
Methods: We studied 40 consecutive patients who were classified into two groups based on their NIHSS scores: progressive infarction (PI) and non-progressive infarction (NPI).