Recently, the research team led by Prof. Tian peng and Prof. LIU zhongmin has developed a new method for one-step synthesis of Na⁺-free Cu-SSZ-13 zeolite.

Cu-containing SSZ-13 is one of the important catalytic materials,which shows promising performance for the direct conversion of methane into methanol and has been used commercially for the NH₃–SCR reaction.Cu-SSZ-13 is generally prepared by the post-synthesis ion exchange method, which involves multiple steps including the synthesis of SSZ-13, calcination to remove organics, NH⁴⁺ion exchange to remove Na⁺, Cu²⁺ion exchange and finally high-temperature calcination and activation treatment. Such a complex procedure is obviously time and cost-consuming and unfavourable for industrial production.At present, there are problems in the one-step direct synthesis of Cu-SSZ-13 in the literature, such as long time-consuming synthesis process and large amount of OSDA.Therefore, it is of great significance to develop a one-step direct and efficient synthesis method of cu-ssz-13 zeolite.Ideally, the synthesis system should not contain alkali cations (Na⁺) and yield Na⁺-free Cu-SSZ-13 product, which allows the direct conversion of the material to active catalyst with abundant acid sites by simple calcination.

To solve these problems,an efficient one-pot synthesis strategy for Na⁺-free SSZ-13 and Cu-SSZ-13 has been rationally developed.The team constructed a gel system containing TMAdaOH, Cu-TEPA complex, small size amine and SSZ-13 seed andthe syntheses can be accomplished with a rapid crystallization rate and high yield.The calcined Na⁺-free Cu-SSZ-13 possesses a high proportion of isolated Cu²⁺ions and shows ~100% NOx conversion in a wide temperature range of 200–450℃in NH₃–SCR reaction under the investigated conditions. After hydrothermal treatment, the sample exhibits enhanced low-temperature activity (<200℃), and the high-temperature activities can still be kept at >80% at 550℃.

The related research results are published in《Chem.com.》The research was supported by National Natural Science Foundation of China and Key Research Program of Frontier Sciences.( Text by wangjuan)

One-pot synthesis of Na+-free Cu-SSZ-13 and its application in the NH3-SCR reaction. Juan Wang, Linying Wang, Dali Zhu, Wenhao Cui, Peng Tian*, Zhongmin Liu*. Chemical communications, 57, 4898 – 4901, 2021.