整体式堇青石负载的Cu-SSZ-13分子筛催化剂的制备及其氨选择性催化还原脱硝性能

以聚乙烯醇（PVA）或拟薄水铝石（SB粉）为涂覆助剂，采用超声波辅助分散法将Cu-SSZ-13分子筛涂覆于蜂窝状堇青石（Cordierite）上，制备了整体式堇青石负载的Cu-SSZ-13分子筛催化剂（Cu-SSZ-13/Cordierite），用于氨选择性催化还原（NH₃-SCR）脱硝，并结合XRD、氮气吸附、SEM及H₂-TPR等表征手段，研究了涂覆助剂对该催化剂的Cu-SSZ-13涂层稳定性、NH₃-SCR脱硝活性、水热稳定性和抗SO₂毒化能力的影响。结果表明，以PVA为涂覆助剂制备的整体式Cu-SSZ-13（PVA）/Cordierite催化剂，其Cu-SSZ-13涂层稳定、脱落率低，选择性催化还原脱硝活性与Cu-SSZ-13原粉基本相当；同时，该Cu-SSZ-13（PVA）/Cordierite催化剂也具有较好的耐高温水热稳定性和抗硫中毒能力，在移动源和固定源脱硝方面有较好应用前景。

Preparation of monolithic cordierite supported Cu-SSZ-13 catalyst and its performance in the selective catalytic reduction of NOx with NH3

A series of monolithic cordierite supported Cu-SSZ-13 catalysts (Cu-SSZ-13/Cordierite) was prepared by coating the Cu-SSZ-13 molecular sieves on the cellular cordierite through ultrasonic dispersion with polyvinyl alcohol (PVA) or pseudo boehmite powder (SB) as assisting agent and used in the selective catalytic reduction of NO_x with NH₃ (NH₃-SCR). With the help of XRD, nitrogen sorption, SEM and H₂-TPR characterization techniques, the influence of coating assistant agent on the firmness of the Cu-SSZ-13 layer, catalytic activity in the NH₃-SCR of NO, hydrothermal stability and resistance against SO₂ poisoning was then investigated. The results indicate that by using PVA as the coating assistant agent, a firm layer of Cu-SSZ-13 can be formed on the surface of monolithic Cu-SSZ-13/Cordierite catalyst. Moreover, the Cu-SSZ-13(PVA)/Cordierite exhibits high catalytic activity in the NH₃-SCR of NO_x (close to that of the pristine Cu-SSZ-13 molecular sieve), high hydrothermal stability and good tolerance to SO₂, displaying great potential as a practicable catalyst for the removal of NO_x from exhausts of both the mobile and the stationary sources.