分子筛作为碳氢吸附剂(HCA)广泛应用到天然气催化剂的材料中,但由于不同分子筛性能不同,使得含HCA催化材料在不同发动机上对THC的处理表现能力表现出较大的不同.如何筛选出满足催化剂设计要求的分子筛材料是进行催化剂设计的重要考虑因素.本文采用比表面积、孔径分布和XRD分析,对所选的三种分子筛Hβ、HZSM-5和NaY的抗热及水热老化性能进行考察.研究结果表明:Hβ在水热老化后骨架坍塌比较严重,抗水热老化性能较差;而NaY的抗热老化性能较差;HZSM-5在热及水热老化后能保持大部分的孔结构,最终HZSM-5分子筛材料相对更适合尾气净化催化剂材料.
参考文献
| [1] | Fullerton D J;Westwood A V K;Brydson R et al.Deactivation and regeneration of Pt/γ-alumina and Pt/ceria-alumina catalysts for methane combustion in the presence of H2S[J].Catalysis Today,2003,81:659-671. |
| [2] | Ryuji Kikuchi;Koichi Eguchi;Shingo Maeda;Kazunari Sasaki;Stefan Wennerstrom .Low-temperature methane oxidation over oxide-supported Pd catalysts: inhibitory effect of water vapor[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2002(1/2):23-28. |
| [3] | Lin W;Lin L;Zhu Y X et al.Pd/TiO2-ZrO2 catalyst for methane total oxidation at low temperature and their 18O-isotope exchange behavior[J].Journal of Molecular Catalysis A:Chemical,2005,226:263-268. |
| [4] | Li X H;Sun K P;Xu X L et al.Low-temperature catalytic combustion of methane over Pd/CeO2 prepared by deposition-precipitation method[J].Catalysis Communications,2005,6:800. |
| [5] | Li Z H;Hoflund G B .Catalytic oxidation of methane over Pd/Co3O4[J].Catalysis Today,1999,66:2-367. |
| [6] | 中国科学院大连化学物理研究所分子筛组.沸石分子筛[M].北京:科学出版社,1978:1-375. |
| [7] | 张进,肖国民.ZSM-5型分子筛的表面酸性与催化活性[J].分子催化,2002(04):307-311. |
| [8] | Nabil Al-Yassir;Raymond Le Van Mao;Francine Heng .Cerium promoted and silica-alumina supported molybdenum oxide in the zeolite-containing hybrid catalyst for the selective deep catalytic cracking of petroleum naphthas[J].Catalysis Letters,2005(1/2):1-6. |
| [9] | Chu P;Pasquale G .Octane enhancement and total liquid product yield improvements in catalytic cracking using insitu crystallized ZSM-5 clay aggregates[P].US 4522705,1985. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%