采用水热合成法制备了I M-5和TNU-9分子筛,并采用水蒸气处理法对其进行了改性。采用XRD、BET、TEM、吡啶-IR、29Si、27Al MAS NMR等手段对分子筛的物化性能进行了表征,并考察了分子筛在甲苯甲醇烷基化反应中的催化性能。结果表明,与ZSM-...采用水热合成法制备了I M-5和TNU-9分子筛,并采用水蒸气处理法对其进行了改性。采用XRD、BET、TEM、吡啶-IR、29Si、27Al MAS NMR等手段对分子筛的物化性能进行了表征,并考察了分子筛在甲苯甲醇烷基化反应中的催化性能。结果表明,与ZSM-5分子筛相比,I M-5和TNU-9分子筛在甲苯甲醇烷基化反应中具有较高的催化活性,二甲苯选择性高。经水蒸气处理后,ST-H-I M-5和ST-H-TNU-9分子筛的活性有所下降,ST-H-I M-5分子筛的二甲苯选择性高,ST-H-TNU-9分子筛的对二甲苯选择性达到40%左右。展开更多
The effects of La on the catalytic performance,SO_(2)and H2O resistance of Cu-Ce/TNU-9 catalyst were studied in the selective catalytic reduction of NO_(x)via ammonia(NH_(3)-SCR).The results show that the La doped Ce-...The effects of La on the catalytic performance,SO_(2)and H2O resistance of Cu-Ce/TNU-9 catalyst were studied in the selective catalytic reduction of NO_(x)via ammonia(NH_(3)-SCR).The results show that the La doped Ce-Cu/TNU-9(CCL/T9)catalyst exhibits better SCR performance than Ce-Cu/TNU-9(CC/T9)and Cu/TNU-9(C/T9)in the wide temperature window(200-450℃)due to La benefiting from enhancing Cu^(+)+Ce^(4+)?Cu^(2+)-+Ce^(3+)to facilitate the electron transfer,which further accelerates the oxidation of NO into NO_(2)that leads to the"Fast SCR".The La can also enhance the surface acidic,redox property and is beneficial to the formation of oxygen vacancy.Meanwhile,the larger co ntent of Ce^(3+) can produce oxygen vacancy,resulting in rising SCR activity.The CCL/T9 has outstanding water and SO_(2) resistance,which may be due to the adso rbed S on the surface of these catalysts mainly existing in the form of a small amount of sulfate and sulfite,the decomposition of ammonium bisulphite under high temperature and the hydrophobicity of TNU-9 zeolite.展开更多
基金supported by the National Natural Science Foundation of China(51708309)the Fundamental Research Funds in Heilongjiang Provincial Universities(145109115)。
文摘The effects of La on the catalytic performance,SO_(2)and H2O resistance of Cu-Ce/TNU-9 catalyst were studied in the selective catalytic reduction of NO_(x)via ammonia(NH_(3)-SCR).The results show that the La doped Ce-Cu/TNU-9(CCL/T9)catalyst exhibits better SCR performance than Ce-Cu/TNU-9(CC/T9)and Cu/TNU-9(C/T9)in the wide temperature window(200-450℃)due to La benefiting from enhancing Cu^(+)+Ce^(4+)?Cu^(2+)-+Ce^(3+)to facilitate the electron transfer,which further accelerates the oxidation of NO into NO_(2)that leads to the"Fast SCR".The La can also enhance the surface acidic,redox property and is beneficial to the formation of oxygen vacancy.Meanwhile,the larger co ntent of Ce^(3+) can produce oxygen vacancy,resulting in rising SCR activity.The CCL/T9 has outstanding water and SO_(2) resistance,which may be due to the adso rbed S on the surface of these catalysts mainly existing in the form of a small amount of sulfate and sulfite,the decomposition of ammonium bisulphite under high temperature and the hydrophobicity of TNU-9 zeolite.
