物理化学学报Issue(2)：329-336,8.DOI:10.3866/PKU.WHXB201412082
Cu-SSZ-13/堇青石整体式催化剂的原位合成及其NH3选择性催化还原NO性能
In situ Synthesis of Cu-SSZ-13/Cordierite Monolithic Catalyst for the Selective Catalytic Reduction of NO with NH3
摘要
Abstract
SSZ-13 molecular sieves were synthesized in situ on the surface of a honeycomb-shaped cordierite support using a hydrothermal method, and the resulting material was characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). The process for preparing SSZ-13/cordierite was optimized in detail. Furthermore, the ion exchange levels of the 50%Cu-SSZ-13/cordierite and Cu-SSZ-13 catalysts were tested in the ammonia-selective catalytic reduction (NH3-SCR) of NO both before and after the hydrothermal treatment process using a fixed-bed reactor. The results of these experiments showed that the Cu-SSZ-13/cordierite prepared in situ by hydrothermal synthesis had good catalytic activity, and gave an NO conversion of more than 80%at temperatures in the range of 200-500 °C, with the highest NO conversion of 96.4%being reached at 300 °C. After being aged hydrothermal y at 850 °C for 12 h, the SCR activity of the Cu-SSZ-13 catalyst was significantly reduced, whereas that of Cu-SSZ-13/cordierite remained largely unchanged with an NO conversion of 91% at 300 ° C. Analysis of the catalysts framework both before and after the hydrothermal treatment by X-ray diffraction and solid state 27Al NMR revealed a significant reduction in the intensities of the X-ray diffraction and tetrahedral aluminum peaks for Cu-SSZ-13, whereas those of the Cu-SSZ-13/cordierite material remained unchanged. These results indicated that the Cu-SSZ-13/cordierite prepared by in situ hydrothermal synthesis was less prone to deactivation by hydrothermal aging.关键词
Cu-SSZ-13分子筛/水热老化/原位合成/堇青石/氨气选择性催化还原Key words
Cu-SSZ-13 molecular sieve/Hydrothermal aging/In situ synthesis/Cordierite/NH3-selective catalytic reduction分类
化学化工引用本文复制引用
张宇,王红宁,陈若愚..Cu-SSZ-13/堇青石整体式催化剂的原位合成及其NH3选择性催化还原NO性能[J].物理化学学报,2015,(2):329-336,8.基金项目
The project was supported by the National Natural Science Foundation of China (21101017).国家自然科学基金(21101017)资助项目 （21101017）
