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Gas-Phase Reactions of HONO with HNO and NH_3: an Ab Initio MO/TST Study

机译:HONO与HNO和NH_3的气相反应:从头算MO / TST研究

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摘要

The reduction of HONO by HNO and NH_3 has been investigated by means of ab initio molecular orbital and transition-state theory (TST) calculations. The main reaction channels for the HNO + trans-HONO (cis-HONO) reactions are those proceeding via five-member ring transition states, leading to the production of NO and H_2O. In the temperature range 300-1000 K, TST calculations predict an A factor of 2.25 * 10~(10) cm~3 mol~(-1) s~(-1) (or 3.63 * 10~(10) cm~3 mol~(-1) s~(-1)) and an apparent activation energy of 20.9 kcal/mol (or 21.9 kcal/mol) for the HNO + trans-HONO (or cis-HONO) reaction. In the NH_3 + HONO system, the reaction NH_3 + cis/trans-HONO → H_2NNO + H_2O with barrier heights centering around 34 kcal/mol can occur at high temperatures. The reversible H-atom exchange reaction NH_3 + cis-HONO <-> H_2NH-O(H)NO <-> NH_2H + cis-HONO occurs readily. The calculated rate constant for the reaction at 300 K is 1.06 * 10~6 cm~3 mol~(-1) s~(-1), in reasonable agreement with the experimental value of 2.2 * 10~6 cm~3 mol~(-1) s~(-1).
机译:已经通过从头算分子轨道和过渡态理论(TST)计算研究了HNO和NH_3对HONO的还原作用。 HNO +反式-HONO(顺式-HONO)反应的主要反应通道是通过五元环跃迁状态进行的反应通道,从而导致NO和H_2O的产生。在300-1000 K的温度范围内,TST计算预测的A因子为2.25 * 10〜(10)cm〜3 mol〜(-1)s〜(-1)(或3.63 * 10〜(10)cm〜3摩尔-(-1)s-(-1)),HNO +反式-HONO(或顺式-HONO)反应的表观活化能为20.9 kcal / mol(或21.9 kcal / mol)。在NH_3 + HONO系统中,NH_3 +顺/反-HONO→H_2NNO + H_2O的势垒高度约为34 kcal / mol的反应会在高温下发生。容易发生可逆的H原子交换反应NH_3 +顺式-HONO--H_2NH-O(H)NO-NH_2H +式-HONO。在300 K下反应的计算速率常数为1.06 * 10〜6 cm〜3 mol〜(-1)s〜(-1),与实验值2.2 * 10〜6 cm〜3 mol〜合理吻合(-1)秒〜(-1)。

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