Synthesis of SSZ-13 Zeolite in the Presence of N,N,NDimethylethylcyclohexyl Ammonium for Selective Catalytic Reduction of NOx
Abstract: Since NOx emission requirements from stationary and mobile sources are more strictly
regulated in the United States, Europe, and other countries; researchers have conducted many studies
to improve the performance of selective catalytic reduction (SCR) catalysts to meet more and more
stringent emission standards. Herein, we reported the synthesis of small pore zeolite (Cu)-SSZ-13
using N,N,N-dimethylethylcyclohexylammonium as the structure directing agent. The catalytic
activity of the fresh and hydrothermal aged copper exchanged supported on SSZ-13 catalyst was
investigated in the SCR of NOx using NH3 as a reductant. Cu-SSZ-13 possessing a high SCR
performance (NOx conversion reached approximately 100% at 250oC), and high hydrothermal
stability in combination with an easy synthesis route is considered to be a potential catalyst for SCR
application.
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lượng N2O tăng ở nhiệt độ cao so với mẫu Cu-SSZ-13 ban đầu. Kết quả khảo sát cũng cho thấy vật liệu tổng hợp có độ chuyển hóa gần tương đương với xúc tác thương mại hóa chabazite (Cu-CHA hoặc Cu-SSZ-13 thương mại) [4,8,30]. 4. Kết luận Zeolit SSZ-13 (Si/Al=10) được tổng hợp thành công với cấu trúc CHA (CHA framework) khi sử dụng cation định hướng cấu trúc N,N,N- dimethylethylcyclohexylammonium với chi phí thấp hơn TMAda+. Vật liệu tổng hợp được có độ tinh thể cao, diện tích và thể tích mao quản lớn. Quan trọng hơn, zeolit Cu-SSZ-13 thể hiện các tính chất hóa học gần tương đương như vật liệu thương mại Cu-CHA/Cu-SSZ-13, với độ chuyển hóa NOx đạt gần 100% ở 250oC, lượng N2O hình thành thấp (~10 ppm), và độ bền thủy nhiệt tương đối cao. Sự kết hợp của hoạt tính xúc tác cao, chi phí tổng hợp thấp mang đến cơ hội cho các ứng dụng rộng rãi của zeolit SSZ-13 này trong các lĩnh vực hấp phụ, tách và xúc tác trong tương lai, đặc biệt cho xử lý khí thải NOx từ động cơ diesel. 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