Effect of K and Ca on catalytic activity of Mn-CeO_x/Ti-PILC

Boxiong SHEN; Lidan DENG; Jianhong CHEN

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Effect of K and Ca on catalytic activity of Mn-CeO_x/Ti-PILC

机译：钾和钙对Mn-CeO_x / Ti-PILC催化活性的影响

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Mn-CeO_x/Ti-pillared clay (PILC) is an attractive catalyst for selective catalytic reduction of NO_x at low temperature because of its low cost. The poisoning of K and Ca on the catalyst of Mn-CeCeO_x/Ti-PILC is an important problem because K and Ca are always in presence in flue gas. To investigate the effect of K and Ca on the physicochemical characters of the catalysts, the techniques of NH_3-temperature programmed desorption (TPD), H_2-temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) were used to analyze the fresh and deactivated catalysts of Mn-CeO_x/Ti-PILC. (Ca)Mn-CeO_x/Ti-PILC and (K)Mn-CeO_x/Ti-PILC are denoted for the dopes of the catalyst of Mn-CeO_x/Ti-PILC with Ca and K, respectively. The activities of Mn-CeO_x/Ti-PILC, (Ca)Mn-CeO_x/Ti-PILC and (K)Mn-CeO_x/ Ti-PILC for NH_3-selective catalytic reduction (SCR) reaction at low temperature were investigated. The results showed that with the dopes of K and Ca on the catalysts, the SCR activities of the catalysts decreased greatly, and K exhibited more poisoning effect than Ca. With the dopes of K and Ca, the acidity, the redox property and chemisorbed oxygen on the surfaces of the catalysts were decreased, which resulted in a decreasing in SCR activity.

机译：Mn-CeO_x / Ti桩状粘土（PILC）由于其低成本而成为一种在低温下选择性催化还原NO_x的有吸引力的催化剂。 Mn-CeCeO_x / Ti-PILC催化剂上的K和Ca中毒是一个重要的问题，因为K和Ca始终存在于烟道气中。为了研究钾和钙对催化剂理化特性的影响，采用NH_3程序升温脱附（TPD），H_2程序升温还原（TPR）和X射线光电子能谱（XPS）技术进行了分析。 Mn-CeO_x / Ti-PILC的新鲜和失活催化剂。（Ca）Mn-CeO_x / Ti-PILC和（K）Mn-CeO_x / Ti-PILC分别表示具有Ca和K的Mn-CeO_x / Ti-PILC催化剂的掺杂。研究了Mn-CeO_x / Ti-PILC，（Ca）Mn-CeO_x / Ti-PILC和（K）Mn-CeO_x / Ti-PILC在低温下对NH_3选择性催化还原（SCR）反应的活性。结果表明，在催化剂上添加K和Ca掺杂后，催化剂的SCR活性大大降低，且K的毒害作用大于Ca。随着钾和钙的掺杂，催化剂表面的酸度，氧化还原性质和化学吸附的氧降低，这导致SCR活性降低。

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来源
《Frontiers of environmental science & eng》 |2013年第4期|512-517|共6页
作者
Boxiong SHEN; Lidan DENG; Jianhong CHEN;
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作者单位

College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China;

College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China;

College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China;

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正文语种 eng
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Mn-CeO_x/Ti-pillared clay (PILC); low-temperature selective catalytic reduction (SCR); K and Ca poisoning effect;

机译：Mn-CeO_x / Ti桩状粘土（PILC）;低温选择性催化还原（SCR）;钾和钙中毒作用;

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1. Effect of K and Ca on catalytic activity of Mn-CeOx/Ti-PILC [J] . Boxiong SHEN, Lidan DENG, Jianhong CHEN 中国环境科学与工程前沿：英文版 . 2013,第004期

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Effect of K and Ca on catalytic activity of Mn-CeO_x/Ti-PILC

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