Fig. 7From: Nano-SiO2/DBN: an efficacious and reusable catalyst for one-pot synthesis of tetrahydrobenzo[b]pyran derivativesa BJH plot, b BET (Brunauer–Emmett–Teller) plot, c t-plot, d Langmuir plot and e adsorption/desorption isotherm of nano-SiO2/DBNBack to article page