Structural properties, acidity and catalytic performance of cobalt, nickel, copper impregnated Al-pillared bentonite catalysts for ethylenediamine bisborane hydrolysis
Materials Chemistry and Physics, cilt.366, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 366
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.matchemphys.2026.132974
- Dergi Adı: Materials Chemistry and Physics
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, Compendex, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Al-pillared bentonite, Catalytic hydrolysis, Copper/cobalt/nickel impregnation, Ethylenediamine bisborane, Hydrogen generation
- Gazi Üniversitesi Adresli: Evet
Özet
Al-pillared bentonite (Al-PB) was synthesized from Hancili-region bentonite using an OH/Al ratio of 2.0 and calcined at 400 °C. Cobalt, nickel and copper were introduced into the Al-PB framework as single-, bi- and trimetallic formulations by wet impregnation, and the resulting catalysts were evaluated for hydrogen generation from ethylenediamine bisborane (EDAB) hydrolysis. XRD confirmed the expansion of the basal spacing after Al-pillaring and showed that the pillared clay structure was largely retained after metal impregnation. XPS and XRD indicated that the incorporated metals in the fresh catalysts were present predominantly as CuO, Co3O4 and NiO species, while pyridine-FTIR showed the coexistence of Lewis and Brønsted acid sites. Metal incorporation reduced BET surface area and micropore volume, especially in Ni-containing samples, suggesting partial occupation or blockage of interlamellar micropores. The catalytic results showed a clear composition dependence: Cu incorporation increased hydrogen production, and the Cu–Ni combination displayed the most favorable balance between Lewis acidity, accessible active sites and catalytic performance. Cu2Ni1-Al-PB achieved 4.667 ± 0.156 mol H2 mol−1 EDAB and a TOF of 67.0 ± 1.9 mol H2 mol−1(Cu + Ni) h−1 (0.08 g catalyst amount, 28.5 mM EDAB concentration) at 80 °C. Activation energy was obtained as 31.87 kJ mol−1for Cu2Ni1-Al-PB.