(435k) Proton-Based Solid Acid for Ammonia Removal
AIChE Annual Meeting
2019
2019 AIChE Annual Meeting
Topical Conference: Ammonia Energy
Poster Session: Ammonia Energy
Tuesday, November 12, 2019 - 6:00pm to 8:00pm
In this study, we used zirconium phosphate, zeolite and impregnated activated carbon as proton-based solid acids. We also used activated carbon allophane and sepiolite as references. Ammonia storage properties of these samples were evaluated in the water solution. The ammonia storage capacity of zirconium phosphate was 10.2 wt%, which is the highest value among the studied samples.
The proton concentration in the samples was determined by titration experiments using NH4HCO3. The proton concentration corresponds to the ammonia storage capacity. This indicates that NH3 reacts with H+ to form NH4+ in the solid acid.
X-ray diffraction was used to estimate the structure of the zirconium phosphate before and after ammonia absorption. We confirmed that the interlayer spacing spreads from 0.77 nm to 0.96 nm by ammonia absorption. Temperature desorption scans of NH3 absorbedzirconium phosphate indicates that NH3 is desorbed below 673 K.
Then, zirconium phosphate was heat-treated at 673 K under vacuum and hydrothermally treated at 443 K. XRD measurement showed that the interlayer spacing was shrunk from 0.96 nm to 0.77 nm by the heat and hydrothermal treatments. Therefore, NH3 absorbed zirconium phosphate can be converted back to zirconium phosphate.
This work was partially supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), âenergy carrierâ (funding agency : JST).
Topics
Checkout
This paper has an Extended Abstract file available; you must purchase the conference proceedings to access it.
Do you already own this?
Log In for instructions on accessing this content.
Pricing
Individuals
AIChE Pro Members | $150.00 |
AIChE Graduate Student Members | Free |
AIChE Undergraduate Student Members | Free |
AIChE Explorer Members | $225.00 |
Non-Members | $225.00 |