Efficient nickel-based catalysts for amine regeneration of CO2 capture:
From experimental to calculations verifications
Abstract
High heat duty is an urgent challenge for industrial applications of
amine-based CO2 capture. In this work, we report a novel, stable,
efficient, and inexpensive Ni-HZSM-5 catalyst to reduce the heat duty.
The density functional theory (DFT) calculations successfully explain
the catalytic performance. The catalytic activity associates with the
combined properties of MSA × B/L × Ni2+. The 7.85-Ni-HZ catalyst
presents an excellent catalytic activity for the CO2 desorption: it
increases the amount of desorbed CO2 up to 36%, reduces the heat duty
by 27.07% compared with the blank run, and possesses high stability
during five cyclic tests. A possible catalytic mechanism for the
Ni-HZSM-5 catalysts through assisting carbamate breakdown and promoting
CO2 desorption is proposed based on experimental results and theoretical
calculations. Therefore, the results present that the 7.85-Ni-HZ
catalyst significantly accelerates the protons transfer in CO2
desorption and can potentially apply in industrial CO2 capture.