The effect of H<sub>2sub> and CO on the selective catalytic reduction of NO<sub>xsub> under real diesel engine exhaust conditions over Pt/Al<sub>2sub>O<sub>3sub>

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• 作者：A. Abu-Jrai ; A. Tsolakis
• 关键词：Pt catalyst ; SCR of NOstyle=""text-decoration ; none ; color ; black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml84&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=7bf7da414204655ca6
• 刊名：International Journal of Hydrogen Energy
• 出版年：2007
• 出版时间：August 2007
• 年：2007
• 卷：32
• 期：12
• 页码：2073-2080
• 全文大小：524 K

文摘

In the presented work the selective catalytic reduction (SCR) of NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml62&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=4113dddcc0950cab0df4252b0492dd74"" title=""Click to view the MathML source""><sub>xsub> in a real diesel engine exhaust gas (Ostyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml63&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=01358443ba7e948d0f47192da3fada64"" title=""Click to view the MathML source""><sub>2sub> present) from the engine operating at different conditions with and without Hstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml64&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=7eaef544a6fed15e0eb60a4ce27ec02e"" title=""Click to view the MathML source""><sub>2sub> and CO additions were studied. The tests were carried out using real diesel engine exhaust gas over 1 % Pt supported on alumina (Alstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml65&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=13d9ffdfb23959b34d1fd1bf3f55b830"" title=""Click to view the MathML source""><sub>2sub>Ostyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml66&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=4814fed86de58922eb60b0029f88ab4b"" title=""Click to view the MathML source""><sub>3sub>). The catalyst exhibits good NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml67&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=749de9aa32ce33b78a61c16a97ec9edf"" title=""Click to view the MathML source""><sub>xsub> reduction activity at a narrow temperature range of 200 to 300 style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml68&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=6bf1d3ad5e87743e1556ee1528e92418"" title=""Click to view the MathML source""><sup>src=""http://www.sciencedirect.com/scidirimg/entities/2218.gif"" alt=""ring operator"" border=0>sup>C when there is only a HC present. The maximum NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml69&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=08e8e1b58b936683e24d53853fe49f31"" title=""Click to view the MathML source""><sub>xsub> reduction of around 60 % was achieved at temperature of 260 l70"">style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml70&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=afb4290172d15cf7117a27ffd57718f6"" title=""Click to view the MathML source""><sup>src=""http://www.sciencedirect.com/scidirimg/entities/2218.gif"" alt=""ring operator"" border=0>sup>C. Although, the engine operating with EGR improves the percentage of NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml71&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=96836721e9f21594fc5e937bb5b0de1a"" title=""Click to view the MathML source""><sub>xsub> converted in the SCR system due to increased HC:NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml72&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=f40c51d80f80fb0b92b2be9b45f3c71a"" title=""Click to view the MathML source""><sub>xsub> ratio and reduced NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml73&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=092d4054abf0584fe69492ea1b64c34f"" title=""Click to view the MathML source""><sub>xsub> concentration in the engine exhaust gas, the number of NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml74&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=c841e1011169bcb45e981f347164cc65"" title=""Click to view the MathML source""><sub>xsub>-ppm reduced over the catalyst was reduced. The cause of this effect is not yet clear, but there are evidences that this attributes to (a) lower NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml75&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=0027ae31304cb968e7703b1a7ea583e5"" title=""Click to view the MathML source""><sub>xsub> coverage on the catalyst surface, which in turn makes its reduction by HC less probable and (b) the increased soot emissions which are blocking part of the catalyst active sites that are active in reducing NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml76&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=193ecb9b0256d3f4e60a46af13bb8930"" title=""Click to view the MathML source""><sub>xsub>. Hydrogen addition expands the SCR activity window towards lower temperatures (100–300 style=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml77&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=4c87169ce8c3706f7a6bad62a0bbe8d7"" title=""Click to view the MathML source""><sup>src=""http://www.sciencedirect.com/scidirimg/entities/2218.gif"" alt=""ring operator"" border=0>sup>C) without affecting the maximum NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml78&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=047d12bc82c71fd2512c8172f6227da5"" title=""Click to view the MathML source""><sub>xsub> conversion. In contradiction to Hstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml79&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=0b5a78a25dc47716878cd7cd8c5e3078"" title=""Click to view the MathML source""><sub>2sub> the CO addition is favourable to the Hstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml80&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=52ea4d32d78de64a0411fc138813e457"" title=""Click to view the MathML source""><sub>2sub> oxidation reaction and the poisoning of the catalysts active sites and the good low temperature NOstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml81&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=7acbdc350a45148196bfd7336125716b"" title=""Click to view the MathML source""><sub>xsub> reduction activity cannot be seen. The incorporation of a mini-exhaust gas-reformer on-board a vehicle to provide the Hstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml82&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=bf1661f07507008911452198ea2cadfc"" title=""Click to view the MathML source""><sub>2sub> in the SCR reactor will require catalyst design and reactor engineering to maximise Hstyle=""text-decoration:none; color:black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4MBT1P5-5&_mathId=mml83&_user=10&_cdi=5729&_rdoc=61&_acct=C000050221&_version=1&_userid=10&md5=d7a250cad685874bbb49d05a4b34a85c"" title=""Click to view the MathML source""><sub>2sub> production and eliminate CO with the minimum penalty in the fuel economy.