| 摘要: | 汽機車與工廠的廢氣排放汙染物大致上包括了: CO、HC、NOX、SOX等 , 而在三相觸媒(three-way catalysts ,TWCs )、流體催化裂解(Fluid catalyst cracking, FCC)及NOX選擇性催化還原(selective catalytic reduction ,SCR)等技術，沒辦法滿足現在日益嚴格的尾氣排放標準，使得NOX儲存-還原催化劑(NOx storage-reduction catalyst , NSR)的誕生。
而近這十年來NSR催化劑，主要分成PBA型、水滑石型、鈣鈦礦型，而最早的NSR催化劑是Pt/Ba/Al2O3體系，它由活性部分Pt，儲存部分Ba和載体部分Al2O3三個部分組成，簡稱為PBA型的NSR催化劑。後來活性貴金屬部分擴展到Pd、Rh等，而儲存的部分擴展到多種鹼金屬和鹼土金屬，而載體也有很多種的變化，如CeO2、ZrO2、SiO2以及改性後的Al2O3等。
而本篇論文主要是討論鋇氧化物的反應機制和化學結構，以利用拉曼光譜、熱重分析和紅外線光譜儀來研究BaO、BaO2對於S8、SOX、NOX的吸附能力。
The auto locomotive and factory emissions of pollutants generally such as carbon monoxide， hydrocarbons ，nitrogen oxides and sulfur oxides，in the three-way catalysts (TWCs )、Fluid catalyst cracking (FCC) and NOX selective catalytic reduction (SCR)， unable to meet increasingly stringent emissions standards，Makes the birth ofNOx storage-reduction catalyst ( NSR)。
The last decade the NSR catalyst is divided into the PBA type hydrotalcite-type perovskite-type the earliest NSR catalyst Pt/Ba/Al2O3 system，It consists of active part of Pt, store parts of Ba and the carrier part of Al2O3 composed of three parts, referred to as the PBA-based NSR catalysts，later, the activity of precious metals part extended to the Pd, Rh, and storage of partially extended to a variety of alkali metal and alkaline earth metal。The carrier also has a variety of changes, CeO2, ZrO2, SiO2, and Al2O3。
In this thesis, mainly to discuss the reaction mechanism and chemical structure of barium oxide to the use of Raman spectroscopy, thermal gravimetric analysis and infrared spectrometer to study of BaO, BaO2 adsorption capacity for S8, SOX, NOX。 |
