• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Rate Constant for the OH plus CO Reaction at Low Temperatures
【24h】

Rate Constant for the OH plus CO Reaction at Low Temperatures

机译：低温下OH + CO反应的速率常数

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Rate constants for the reaction of OH + CO -> products (1) have been measured using laser photolysis/laser-induced fluorescence (LP/LIF) over the temperature range 193-296 K and at pressures of 50-700 Torr of Ar and N-2. The reaction was studied under pseudo-first-order conditions, monitoring the decay of OH in the presence of a large excess of CO. The rate constants can be expressed as a combination of bimolecular and termolecular components. The bimolecular component was found to be temperature-independent with an expression given by k(bi)(T) = (1.54 +/- 0.14) x 10(-13)[e(-(13)+/-(17)/T)] cm(3) molecule(-1) s(-1), with an error of one standard deviation. The termolecular component was fitted to the expression, k(ter) = k(0)(T)[M]/[1 + (k(0)(T)[M]/k(infinity)(T)] x 0.6(10)({1+[log)((k0(T)[M]/k infinity(T))]2}-1) where k(0)(T) = k(0)(300)(T/300)(-n) and k(infinity)(T) = k(infinity)(300)(T/300)(-m). The parameters for k(0)(T) were determined to be k(0)(300) = (6.0 +/- 0.5) X 10(-33) cm(6) molecule(-2) s(-1) in N-2 and k(0)(300) = (3.4 +/- 0.3) x 10(-33) cm(6) molecule(-2) s(-1) in Ar, with n = 1.9 +/- 0.5 and 2.0 +/- 0.4 in N-2 and Ar, respectively. These parameters were determined using k(0)(T) and m from the NASA kinetics data evaluation (JPL Publication No. 10-6) since the experimental pressure range was far from the high-pressure limit. Addition of low concentrations of O-2 had no discernible effect on the mechanism of the OH + CO reaction but resulted in secondary reactions which regenerated OH.
机译：使用激光光解/激光诱导的荧光（LP / LIF）在193-296 K的温度范围和50-700 Torr的Ar和N-2。在拟一级反应条件下研究了该反应，在大量过量的CO的存在下监测OH的衰减。速率常数可以表示为双分子和分子成分的组合。发现该双分子成分与温度无关，其表达式为k（bi）（T）=（1.54 +/- 0.14）x 10（-13）[e（-（13）+/-（17）/ T）] cm（3）分子（-1）s（-1），误差为一个标准偏差。将分子成分拟合为表达式，k（ter）= k（0）（T）[M] / [1 +（k（0）（T）[M] / k（infinity）（T）] x 0.6 （10）（{1+ [log）（（k0（T）[M] / k infinity（T））] 2} -1）其中k（0）（T）= k（0）（300）（T / 300）（-n）和k（无穷大）（T）= k（无穷大）（300）（T / 300）（-m）.k（0）（T）的参数确定为k（0 ）（300）=（6.0 +/- 0.5）X 10（-33）cm（6）分子（-2）s（-1）在N-2中，k（0）（300）=（3.4 +/-在Ar中为0.3）x 10（-33）cm（6）分子（-2）s（-1），在N-2和Ar中n分别为1.9 +/- 0.5和2.0 +/- 0.4。由于实验压力范围远离高压极限，因此使用NASA动力学数据评估（JPL出版物10-6）中的k（0）（T）和m进行了测定，添加了低浓度的O-2对OH + CO反应的机理没有明显影响，但会导致二次反应再生OH。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号