Influence of Ca doping and calcination temperature on selective catalytic oxidation of NO over Mn-Ca-O-x-(CO3)(y) catalysts
Influence of Ca doping and calcination temperature on selective catalytic oxidation of NO over Mn-Ca-O-x-(CO3)(y) catalysts
复制标题
Ca掺杂和焙烧温度对Mn-Ca-O-x-(CO3)(y)催化剂选择性催化氧化NO的影响
DOI：
10.1039/c7nj02230a
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发表时间：
2017
影响因子：
3.3
通讯作者：
Liu Ye
中科院分区：
文献类型：
--
作者：
Zhang Ruiyuan;Wang Chi;Li Kai;Sun Xin;Ning Ping;Tang Lihong;Liu Ye
选择性催化氧化（SCO）是一种非传统的脱硫技术. SCO方法的关键是开发一种能够在低温下实现高催化氧化活性的新型催化剂。通过共沉淀法制备了一系列Mn-Ca-Ox-（CO 3）y催化剂，并用于在低温范围内（即，60-360 °C）。结果表明，在270 °C和空速为30 000 h-1的条件下，Mn-Ca-Ox-（CO 3）y催化剂上的最佳NO转化率为79.4%。 通过比较MnOx和Mn-Ca-Ox-（CO 3）y的活性，MnOx的活性低于Mn-Ca-Ox-（CO 3）y，特别是在低温区（<240 °C）。因此，钙的掺杂可以提高催化剂的氧化活性。钙的添加在MnO 2生成和催化剂的结构性质中起着积极的作用。原位漫反射红外光谱（DRIFTS）结果表明，Mn-Ca-Ox-（CO 3）y催化剂中存在碱性氧化物，更容易生成硝酸盐，这是Mn-Ca-Ox-（CO 3）y催化剂与MnOx相比表现出更高活性的主要原因，特别是在低温下。
Selective catalytic oxidation (SCO) is an unconventional technology for denitration. The key to the SCO approach is to develop a novel catalyst that can achieve high catalytic oxidation activity at low temperature. A series of Mn–Ca–Ox–(CO3)y catalysts were prepared by co-precipitation methods and used for the catalytic oxidation of nitric oxide (NO) over a low temperature range (i.e., 60–360 °C). The results indicated that the best NO conversion over the Mn–Ca–Ox–(CO3)y catalysts was 79.4% at 270 °C with a space velocity of 30 000 h−1. By comparing the activities of MnOx and Mn–Ca–Ox–(CO3)y, the activities of MnOx are lower than those of Mn–Ca–Ox–(CO3)y, especially in the low temperature region (<240 °C). Therefore, doping with calcium could enhance the catalytic oxidation activity. The addition of calcium plays an active role in MnO2 generation and the structural properties of the catalysts. The characterization results indicated that the MnO2 that was generated at a low calcination temperature was favourable for oxidation of NO. The in situ diffuse reflectance infrared transform spectroscopy (DRIFTS) results indicated that nitrate could be more easily generated on Mn–Ca–Ox–(CO3)y due to alkaline oxide existing in the catalysts, which is the primary reason why the Mn–Ca–Ox–(CO3)y catalysts exhibit higher activity compared to MnOx, especially at low temperature.