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Poisoning-Resistant NOx Reduction in the Presence of Alkaline and Heavy Metals over H-SAPO-34-Supported Ce-Promoted Cu-Based Catalysts.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-05-01 , DOI: 10.1021/acs.est.0c00100 Penglu Wang 1 , Lijun Yan 1 , Yundong Gu 1 , Sanchai Kuboon 2 , Hongrui Li 1 , Tingting Yan 1 , Liyi Shi 1 , Dengsong Zhang 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-05-01 , DOI: 10.1021/acs.est.0c00100 Penglu Wang 1 , Lijun Yan 1 , Yundong Gu 1 , Sanchai Kuboon 2 , Hongrui Li 1 , Tingting Yan 1 , Liyi Shi 1 , Dengsong Zhang 1
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Selective catalytic reduction (SCR) of NOx using NH3 in the presence of alkaline and heavy metals is still an issue in the application of a stationary source. Reported here is the rational design of a novel H-SAPO-34-supported ceria-promoted copper-based catalyst (CuCe/H-SAPO-34) that demonstrates exceptional resistance against alkali (K), alkaline earth (Ca), and heavy metal (Pb) poisoning during SCR of NOx. The H-SAPO-34 support contained numerous acid sites that allowed Cu-based catalysts to maintain their catalytic activity while also resisting poisoning by K and Ca. Decorating the catalyst with CeO2 promoted the low-temperature deNOx activity by accelerating the redox cycle with Cu species and assisted the H-SAPO-34 in capturing Ca and Pb. H-SAPO-34-supported ceria-promoted copper oxide catalysts prevented the irreversible combination of K, Ca, or Pb with the active centers, providing the catalyst with excellent poisoning resistance. This work provides a strategy for the development of high-performance, poisoning-resistant catalysts for NH3-SCR of NOx in the presence of alkaline and heavy metals.
中文翻译：
在H-SAPO-34负载的Ce促进的Cu基催化剂上，在碱金属和重金属存在下具有抗中毒性的NOx还原。
在碱性和重金属存在下使用NH3选择性催化还原NOx仍然是固定源应用中的一个问题。此处报道的是新型H-SAPO-34负载的二氧化铈促进的铜基催化剂（CuCe / H-SAPO-34）的合理设计，该催化剂表现出优异的耐碱（K），碱土（Ca）和重金属抗性NOx SCR过程中金属（Pb）中毒。H-SAPO-34载体包含许多酸性位，这些酸性位可使Cu基催化剂保持其催化活性，同时还可以抵抗K和Ca所引起的中毒。用CeO2修饰催化剂可通过加速Cu物种的氧化还原循环来促进低温脱硝活性，并帮助H-SAPO-34捕获Ca和Pb。H-SAPO-34负载的二氧化铈促进的氧化铜催化剂可防止K的不可逆组合，具有活性中心的Ca或Pb，使催化剂具有出色的抗中毒性。这项工作为开发在碱金属和重金属存在下用于NOx的NH3-SCR的高性能，抗中毒催化剂提供了一种策略。
更新日期：2020-04-23
中文翻译：
在H-SAPO-34负载的Ce促进的Cu基催化剂上，在碱金属和重金属存在下具有抗中毒性的NOx还原。
在碱性和重金属存在下使用NH3选择性催化还原NOx仍然是固定源应用中的一个问题。此处报道的是新型H-SAPO-34负载的二氧化铈促进的铜基催化剂（CuCe / H-SAPO-34）的合理设计，该催化剂表现出优异的耐碱（K），碱土（Ca）和重金属抗性NOx SCR过程中金属（Pb）中毒。H-SAPO-34载体包含许多酸性位，这些酸性位可使Cu基催化剂保持其催化活性，同时还可以抵抗K和Ca所引起的中毒。用CeO2修饰催化剂可通过加速Cu物种的氧化还原循环来促进低温脱硝活性，并帮助H-SAPO-34捕获Ca和Pb。H-SAPO-34负载的二氧化铈促进的氧化铜催化剂可防止K的不可逆组合，具有活性中心的Ca或Pb，使催化剂具有出色的抗中毒性。这项工作为开发在碱金属和重金属存在下用于NOx的NH3-SCR的高性能，抗中毒催化剂提供了一种策略。
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