Optimizing study on the NH-SCR activity of Ce-W-Ti@g-CN catalyst: influence of graphite carbon nitride types.

Herein, three g-CN(MCN/TCN/UCN), obtained by the direct pyrolysis of melamine/urea/thiourea respectively, were introduced as supports to optimize the NH-SCR activity of Ce-W-Ti catalyst. Compared to CWT-400-Air, CWT@g-CN(2)-300-N exhibits lower crystalline anatase TiO and larger specific surface area, which improves the dispersion of Ce/W/Ti species on catalysts surface. Furthermore, the introduction of g-CN as supports also contributes to doping C/N elements into Ce-W-Ti catalyst and increases the Ce/(Ce+Ce) and O/(O+O) molar ratios on catalyst surface. These all are advantageous to the NH-SCR activity. However, UCN shows better promotional effect than MCN and TCN. This might be mainly attributed to the loose and porous stacked layered fold structure of UCN, the larger BET surface area, higher dispersion of Ce/W/Ti species and moderate weak/medium-strong acid sites of CWT@UCN(2)-300-N. At the same time, the influence of carbon nitride amount, calcination atmosphere and calcination temperature on the NH-SCR activity of CWT@g-CN catalyst were also investigated.