隨著經濟的蓬勃發展，工業技術與產業持續的製造，如工業鍋爐、燃燒爐與汽機車燃燒燃料的排放，常伴隨著大量氮氧化物的產生造成空氣污染的憂慮。氮氧化物在空氣中會氧化成二氧化氮，對人體造成呼吸道的傷害亦是形成酸雨與臭氧的主因之一。在現有的氮氧化物控制技術中，以選擇性觸媒還原法(Selective catalytic reduction, SCR)經觸媒催化下使 NOx 轉化為無害的 N2 及O2，此系統最為純熟與有效控制 NOx 的排放。然而 SCR 觸媒在長期使用下使觸媒毒化、老化，導致 SCR 觸媒效率降低而需替換，造成固體廢棄物的產生。因此，本研究將廢 SCR 觸媒以「鹼培燒-熱水浸漬-離子交換」程序資源化，特別探討浸漬液之 pH 值、金屬濃度及樹脂與溶液接觸時間的長短等條件，對回收脫硝廢觸媒(Spent SCR catalyst)中含有之鎢、鉬、釩等有價金屬的分離及純化效果之影響。
以「碳酸鈉鹼培燒+熱水浸漬」程序所得廢SCR觸媒浸漬液，其鎢與釩浸出率為90%以上，利用此浸漬條件採用強鹼型 IRA900Cl 樹脂進行離子交換管柱實驗，發現(1)原始浸漬液 pH12.16時，IRA900Cl能同時吸附鎢、釩離子且富集兩種金屬，其吸附量各為69.58g W/L resin、4.16g V/L resin 。(2)當浸漬液添加鹽酸調整pH為8.25時， WO42-、Si(OH)4離子在IRA900Cl親合力比HV2O73-弱，很快於交換尾液中突破，此條件可達成V的分離與富集，其吸附量65.25g V/ L resin。(3)將浸漬液添加氫氧化鈉至pH 為13.34，樹脂上的 NH4+ 官能基密度降低，交換陰離子空缺變少，使WO42-離子相較於VO43-離子更容易吸附在樹脂上，此條件可達成W的分離與富集，其吸附量為42.72g W/L resin。 (4)使用脫附劑2M NaCl+1M NaOH 與5N NH4Cl+2N NH4OH沖提對IRA900Cl樹脂，脫附鎢金屬能力達90%以上。

With rapid economic development throughout the industry, the increase of mobile combustion engines, power plants and other incineration processes are the main sources of air pollution. Selective catalytic reduction (SCR) is one of the NOx treatment methods; it can offer higher NOx control efficiency and produces harmless N2 and H2O as end products. After a period of time, the SCR catalysts will be poisoned due to contamination and result in catalytic deactivation. Therefore, this study demonstrates the combination of the two unit processes to recover tungsten and vanadium from spent SCR catalysts. Those two unit processes are Na2CO3 roasting-hot water leaching and ion exchange.
When the pH value of solution was about 12.16, the IRA900 could adsorb anions such as HVO42-, V2O74-and WO42- . The exchange capacity was determined to be 4.16g V/L resin , 69.58g W/L resin. At pH value range of 8.5~9.5,the IRA900 could selectively load HV2O73- from the solution, the exchange capacity was determined as 65.25g V/ L resin. Under strongly basic condition ( pH 13.34), the IRA900 selectively loads WO42- from the solution, the exchange capacity was determined as 42.72g W/L resin. The results of elution tests showed that the loaded metals could be easily eluted with 2M NaCl+1M NaOH or 5N NH4Cl+2N NH4OH and a 90% metal recovery was reached.

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