Inorganic Chemicals Industry >
Effect of oxalic acid solution treatment on physiochemical properties and catalytic performance of SAPO-34 molecular sieve
Received date: 2019-08-29
Online published: 2020-02-26
The modification effect of oxalic acid solution treatment on SAPO-34 molecular sieve was studied by means of XRD,SEM,N2 physisorption,XRF,ICP-AES,NH3-TPD,FT-IR,solid NMR and fixed-bed methanol to olefins（MTO） reaction performance evaluation.Results showed that,treating SAPO-34 molecular sieve with oxalic acid solution can produce macropores in the crystalsvia skeleton etching,and consequently adjust the pore structure and micropore diffusivity.Meanwhile,the acid treatment can also selectively reduce the framework Si content,and consequently decrease the acid strength and surface acid site concentrationof SAPO-34 molecular sieve.These modification effects of the oxalic acid solution treatment can notably improve the anti-coking deactivation ability of SAPO-34 catalyst in MTO reaction.Therefore,the oxalic acid solution treatment is a method worth studying for the modification of SAPO-34 molecular sieve and the preparation of MTO catalyst.
Wujun Shao , Chunyan Liu , Ning He , Hongchen Guo . Effect of oxalic acid solution treatment on physiochemical properties and catalytic performance of SAPO-34 molecular sieve[J]. Inorganic Chemicals Industry, 2020 , 52(2) : 84 -90 . DOI: 10.11962/1006-4990.2019-0169
| [1] | Jin Wenlong, Wang Baojie, Guo Pengfei . Selective desilication,me-soporesformation,and MTO reaction enhancement via citric acid treatment of zeolite SAPO-34[J]. Ind.Eng.Chem.Res., 2018,57:4231-4236. |
| [2] | Valtchev V, Tosheva L . Porous nanosized particles:Preparation,pro-perties,and applications[J]. Chem.Rev., 2013,113:6734-6760. |
| [3] | De La Torre U, Pereda-Ayo B, González-Velasco J R . Cu-zeolite NH3-SCR catalysts for NOx removal in the combined NSR-SCR te-chnology[J]. Chem.Eng.J., 2012,207/208:10-17. |
| [4] | 刘中民, 刘昱, 田鹏 , 等. 甲醇制烯烃[M]. 北京: 科学出版社, 2015. |
| [5] | Di Chunyu, Li Xiaofeng, Wang Ping , et al. Green and efficient dry gel conversion synjournal of SAPO-34 catalyst with plate-like mor-phology[J]. Petroleum Science, 2017,14(1):203-213. |
| [6] | Hajfarajollah H, Askari S, Halladj R . Effects of micro and nano-sized SAPO-34 and SAPO-5 catalysts on the conversion of methanol to light olefins[J]. Reaction Kinetics Mechanisms & Catalysis, 2014,111(2):723-736. |
| [7] | Liu Guangyu, Tian Peng, Xia Qinhua , et al. An effective route to improve the catalytic performance of SAPO-34 in the methanol-to-olefin reaction[J]. Journal of Natural Gas Chemistry, 2012,21(4):431-434. |
| [8] | 任淑, 刘国娟, 吴晛 , 等. 酸处理可控制备多级孔SAPO-34及其甲醇制烯烃性能[J]. 催化学报, 2017(1):134-141. |
| [9] | Chen X X, Vicente A, Qin Z X , et al. Preparation of hierarchical SAPO-34 crystals by post-synjournal fluoride etching[J]. Chem.Co-mmun. 2016,52(17).DOI: 10.1039.C5CC09498D. |
| [10] | Qiao Y Y, Yang M, Gao B B , et al. Creation of hollow SAPO-34 single crystals via alkaline or acid etching[J]. Chemical Communi-cations, 2016,52(33):5718-5721. |
| [11] | álvaro-Mu?oz T, Márquez-álvarez C, Sastre E . Use of different te-templates on SAPO-34 synjournal:Effect on the acidity and cataly-tic activity in the MTO reaction[J]. Catalysis Today, 2012,179(1):27-34. |
| [12] | Zhong Jiawei, Han Jingfeng, Wei Yingxu , et al. Enhancing ethylene selectivity in MTO reaction by incorporating metal species in the cavity of SAPO-34 catalysts[J]. Chinese Journal of Catalysis, 2018,39(11):1821-1831. |
/
| 〈 |
|
〉 |