Dynamic Estimation Method of Effective Active Site on Palladium Methane Oxidation Catalyst in Exhaust Gas of Marine Lean Burn Gas Engine
Dynamic Estimation Method of Effective Active Site on Palladium Methane Oxidation Catalyst in Exhaust Gas of Marine Lean Burn Gas Engine
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船用稀薄燃烧燃气发动机废气中钯甲烷氧化催化剂有效活性位动态估算方法
DOI：
10.1115/1.4048161
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yamasaki Yudai
中科院分区：
文献类型：
--
作者：
Nitta Yoshifuru;Yamasaki Yudai
由于能减少氮氧化物、硫氧化物和二氧化碳的排放，稀燃型燃气发动机最近引起了海事行业的关注。然而，由于甲烷（CH4）是天然气的主要成分，漏失的甲烷，即未燃烧的甲烷，可能会导致全球变暖。因此，在稀燃燃气发动机排气后处理技术方面取得进展具有重要意义。钯（Pd）催化剂与铂相比，可以在较低的排气温度下活化，有望为甲烷漏失提供对策。然而，在较高的水（H2O）浓度下应该克服失活，因为H2O抑制ch4氧化。本研究旨在探讨排气温度或气体成分对活性钯催化剂位点的影响，以阐明稀燃燃气发动机废气中ch4氧化性能。作者开发了估算不同排气温度下钯催化剂有效活性位点的方法。该估算方法是基于这样的假设：用于ch4氧化过程的活性位点可以与用于一氧化碳氧化的活性位点共享。在Pd催化剂的活性位点上化学吸附的CO分子可以为ch4氧化过程提供有效的活性位点。本文介绍了新方法的实验结果和验证，结果表明，在250 ~ 450℃的贫燃燃气发动机排气温度范围内，Pd/ al2o3催化剂上化学吸附CO体积随着Pd负荷的增加而增加。
Lean-burn gas engines have recently attracted attention in the maritime industry, because they can reduce NOx, SOx, and CO2emissions. However, since methane (CH4) is the main component of natural gas, the slipped methane, which is the unburned methane, likely contributes to global warming. It is thus important to make progress on exhaust after-treatment technologies for lean-burn gas engines. A Palladium (Pd) catalyst for CH4oxidation is expected to provide a countermeasure for the slipped methane, because it can activate at lower exhaust temperature comparing with platinum. However, a de-activation in higher water (H2O) concentration should be overcome because H2O inhibits CH4oxidation. This study was performed to investigate the effects of exhaust temperature or gas composition on active Pd catalyst sites to clarify CH4oxidation performance in the exhaust gas of lean-burn gas engines. The authors developed the method of estimating effective active sites for the Pd catalyst at various exhaust temperatures. The estimation method is based on the assumption that active sites used for CH4oxidation process can be shared with the active sites used for carbon mono-oxide (CO) oxidation. The molecular of chemisorbed CO on the active sites of the Pd catalyst can provide effective active sites for CH4oxidation process. This paper introduces experimental results and verifications of the new method, showing that chemisorbed CO volume on a Pd/Al2O3catalyst is increased with increasing Pd loading in 250–450 °C, simulated as a typical exhaust temperature range of lean-burn gas engines.
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DOI：
10.1016/s0167-2991(01)80023-9
发表时间：
2001
期刊：
Studies in Surface Science and Catalysis
影响因子：
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作者：
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DOI：
10.1115/1.4037868
发表时间：
2018-02-01
影响因子：
1.5
作者：
Nitta, Yoshifuru;Yoo, Dong-Hoon;Yamasaki, Yudai
通讯作者：
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