Tailoring water adsorption capacity of APO-Tric

Mal, Suzana (author), Ristić, Alenka (author), Golobič, Amalija (author), Zabukovec Logar, Nataša (author)

Microporous triclinic AlPO$_4$-34, known as APO-Tric, serves as an excellent water adsorbent in thermal energy storage, especially for low temperature thermochemical energy storage. Increased water adsorption capacity of thermochemical material usually leads to higher thermal energy storage capacity, thus offering improved performance of the adsorbent. The main disadvantage of aluminophosphate-based TCM materials is their high cost due to the use of expensive organic templates acting as structure directing agents. Using ionic liquids as low cost solvents with associated structure directing role can increase the availability of these water adsorbents for TES applications. Here, a green synthesis of APO-Tric crystals at elevated and ambient pressure by using 1-ethyl-3-methyl imidazolium bromide ionic liquid is presented. Large 200 µm romboid shaped monocrystals were obtained at 200 °C after 6 days. The structure of APO-Tric and the presence of 1,3-dimetylimidazolium cation in the micropores were determined by single crystal XRD at room temperature and 150 K. Water sorption capacity of APO-Tric prepared by ionothermal synthesis at elevated pressure increased in comparison to the material obtained at hydrothermal synthesis most probably due to additional structural defects obtained after calcination. The reuse of exhausted ionic liquid was also confirmed, which adds to the reduction of toxicity and cost production of the aluminophosphate synthesis.

• Language: English
• Keywords: APO-Tric, water adsorption capacity, thermal energy storage, green ionothermal synthesis, single-crystal structure determination
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 12 str.
• Numbering: Vol. 11, iss. 7, art. 773
• PID: 20.500.12556/RUL-135867
• UDC: 544.5/.6
• ISSN on article: 2073-4352
• DOI: 10.3390/cryst11070773
• COBISS.SI-ID: 70093315
• Publication date in RUL: 30.03.2022

Record is a part of a journal

• Title: Crystals
• Shortened title: Crystals
• Publisher: MDPI
• ISSN: 2073-4352
• COBISS.SI-ID: 36677893

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 02.07.2021

Secondary language

• Language: Slovenian
• Keywords: elektrokemija, hranilniki toplote, absorpcija, sinteza

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P1-0021
• Name: Nanoporozni materiali