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One‐pot synthesis of Cu/SAPO‐34 with hierarchical pore using cupric citrate as a copper source for excellent NH3‐SCR of NO performance
ChemCatChem ( IF 3.8 ) Pub Date : 2020-07-10 , DOI: 10.1002/cctc.202000818 Peiqiang Wang 1 , Zhibin Li 1 , Xiaotong Wang 1 , Yongming Tong 1 , Fulong Yuan 1 , Yujun Zhu 1
ChemCatChem ( IF 3.8 ) Pub Date : 2020-07-10 , DOI: 10.1002/cctc.202000818 Peiqiang Wang 1 , Zhibin Li 1 , Xiaotong Wang 1 , Yongming Tong 1 , Fulong Yuan 1 , Yujun Zhu 1
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It is still a serious challenge to develop a simple synthesized method of SAPO‐34 sieve modified by Cu with high NH3‐SCR performance. The Cu/SAPO‐34 samples with hierarchical structure were synthesized for the first time using cupric citrate as copper source by one‐pot hydrothermal method which showed excellent NH3‐SCR performance for NO removal. Among them, the 0.15Cu/SAPO‐34 catalyst with a Cu/Al ratio of 0.15 exhibited the widest temperature operating window (160–500 °C) and better hydrothermal stability. The physicochemical properties of 0.15Cu/SAPO‐34 was measured to understand the impacts of the Cu species on the NH3‐SCR of NO activity by various characterization methods including XRD, NH3‐TPD, N2 adsorption‐desorption, XPS, EPR, UV‐vis, NH3‐oxidation, NMR and in situ DRIFTS. The results reveal that the good activity is assigned to the isolated Cu species located at the site (I) in SAPO‐34, and the co‐existence of surface Cu2+ and Cu+ species with almost equal amounts. In addition, 0.15Cu/SAPO‐34 also possesses suitable acidic sites which are conducive to catalytic activity. The results of in situ DRIFTS suggest that the NH3‐SCR reaction follows Eley‐Rideal mechanism over 0.15Cu/SAPO‐34.
中文翻译：
使用柠檬酸铜作为铜源一锅合成具有分层孔的Cu / SAPO-34，可获得出色的NH3-SCR NO性能
开发一种具有高NH 3 SCR性能的Cu改性的SAPO-34筛的简单合成方法仍然是一个严峻的挑战。通过单锅水热法首次使用柠檬酸铜作为铜源合成具有分层结构的Cu / SAPO-34样品，该样品显示出优异的NH 3 -SCR脱氮性能。其中，Cu / Al比为0.15的0.15Cu / SAPO-34催化剂具有最宽的温度工作范围（160-500°C）和更好的水热稳定性。通过各种表征方法，包括XRD，NH 3 -TPD，N 2，对0.15Cu / SAPO-34的理化性质进行了测量，以了解Cu物种对NH 3 -SCR NO活性的影响吸附解吸，XPS，EPR，UV可见，NH 3氧化，NMR和原位DRIFTS。结果表明，良好的活性被分配给位于SAPO-34中位置（I）的分离出的Cu物种，并且表面Cu 2+和Cu +物种的数量几乎相等。此外，0.15Cu / SAPO-34还具有合适的酸性位点，有助于催化活性。原位DRIFTS的结果表明，在0.15Cu / SAPO-34上，NH 3 -SCR反应遵循Eley-Rideal机理。
更新日期：2020-07-10
中文翻译：
使用柠檬酸铜作为铜源一锅合成具有分层孔的Cu / SAPO-34，可获得出色的NH3-SCR NO性能
开发一种具有高NH 3 SCR性能的Cu改性的SAPO-34筛的简单合成方法仍然是一个严峻的挑战。通过单锅水热法首次使用柠檬酸铜作为铜源合成具有分层结构的Cu / SAPO-34样品，该样品显示出优异的NH 3 -SCR脱氮性能。其中，Cu / Al比为0.15的0.15Cu / SAPO-34催化剂具有最宽的温度工作范围（160-500°C）和更好的水热稳定性。通过各种表征方法，包括XRD，NH 3 -TPD，N 2，对0.15Cu / SAPO-34的理化性质进行了测量，以了解Cu物种对NH 3 -SCR NO活性的影响吸附解吸，XPS，EPR，UV可见，NH 3氧化，NMR和原位DRIFTS。结果表明，良好的活性被分配给位于SAPO-34中位置（I）的分离出的Cu物种，并且表面Cu 2+和Cu +物种的数量几乎相等。此外，0.15Cu / SAPO-34还具有合适的酸性位点，有助于催化活性。原位DRIFTS的结果表明，在0.15Cu / SAPO-34上，NH 3 -SCR反应遵循Eley-Rideal机理。
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