| 查看: 1116 | 回复: 3 | |||
| 当前主题已经存档。 | |||
| 【有奖交流】积极回复本帖子，参与交流，就有机会分得作者 samuhu 的 3 个金币 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
[交流]
[求助]关于合成NAY型分子筛的导向剂问题
|
|||
|
最近在做NAY型分子筛的时候，出现了一个问题：导向剂的制备过程中出现导常现象。 现简单介绍下导向剂的制备过程： 1、制作25#标准水玻璃（SiO2：250g/l Na2O:88g/l） 2、制作偏铝酸钠（Al2O3:42.5g/l Na2O:283g/l） 3、量取300ML 标准水玻璃置于斜圆底烧瓶，并搅拌 4、量取200ML偏铝酸钠溶液缓慢加入到同一圆底烧瓶中 5、搅拌30分钟 6、把混合液置于32度恒温水浴中，老化16小时。 配方的合成分比例为：SiO2：Al2O3：Na2O：H2O=15：1：16：319（mol比） 正常情况下：在第五步过程中，溶液呈透明状态，在老化第2-3个小时，开始出现乳白色胶体，16小时后，胶体变稠。 现在的情况：在第五步的过程中，第三分钟后，溶液迅速变胶（非常稠，甚至成块状） 为了解决此问题，我是这样做的： 1、换水玻璃（没成效） 2、重新制作偏铝酸钠（无成效） 3、冷却水玻璃，偏铝酸钠（怀疑环境温度升高，无成效） 现在想向兄弟们请教： 1、兄弟们在做Y型分子筛导向剂的时候，在制作是个什么的现象？ 2、能否提供你们做导向剂的方法？ |
回复此楼» 猜你喜欢
国家级人才团体课题组招收2026届化学类学硕，专硕。
已经有1人回复
-
河南理工大学绿色催化课题组招收材料，化工，化学等方向研究生
已经有0人回复
-
化学工程及工业化学论文润色/翻译怎么收费?
已经有278人回复
-
国家级人才课题组招研究生 （催化方向）调剂
已经有13人回复
-
招收硕士研究生
已经有25人回复
-
[天津]中国民航大学 招收材料类研究生
已经有0人回复
-
材料与化工专业有大量调剂指标
已经有8人回复
-
国家大人才课题组招收化学、材料化工类2026年调剂生
已经有0人回复
-
085600调剂
已经有4人回复
-
浙师大化与材学院2026年有大量硕士研究生调剂名额 （线上 调剂）
已经有6人回复
-
吉林工程技术师范学院 材料与化工 （0856） 招收调剂
已经有3人回复
» 本主题相关商家推荐: (我也要在这里推广)
dj_king
铁杆木虫 (著名写手)
- 应助: 9 (幼儿园)
- 金币: 13018.2
- 散金: 780
- 红花: 3
- 帖子: 2260
- 在线: 190.6小时
- 虫号: 497723
- 注册: 2008-02-02
- 性别: GG
- 专业: 污染控制化学
3楼2008-06-01 07:31:48
dj_king
铁杆木虫 (著名写手)
- 应助: 9 (幼儿园)
- 金币: 13018.2
- 散金: 780
- 红花: 3
- 帖子: 2260
- 在线: 190.6小时
- 虫号: 497723
- 注册: 2008-02-02
- 性别: GG
- 专业: 污染控制化学
★ ★
samuhu(金币+2,VIP+0):谢谢，最想知道的是，你在做导向剂的时候，在搅拌过程中会不会产生乳白色胶体。
samuhu(金币+2,VIP+0):谢谢，最想知道的是，你在做导向剂的时候，在搅拌过程中会不会产生乳白色胶体。
|
FAU Linde Type Y Si(71), Al(29) Contributed by David Ginter Verified by G. Price andby C. Kuntz Type Material Na56[Al56Si136O384] : 250 H2O Method D. M. Ginter, A. T. Bell and C. J. Radke [1] Batch Compositiona Seed Gel (5% of Al): 10.67 Na2O : Al2O3 :10 SiO2 : 180 H2O Feed Stock Gel (95% of Al): 4.30 Na2O : Al2O3 : 10 SiO2:180 H2O Overall Gel: 4.62 Na2O : Al2O3 : 10 SiO2 : 180 H2O Source Materials deionized water sodium aluminate solid (Strem Chemicalb 1.27 Na/Al, 6.1% H2O) sodium hydroxide pellets (J. T.Baker, 99% NaOH) sodium silicate solution (PQ Corp, N Brand, 28.7 wt% SiO2, 8.9 wt% Na2O)c Batch Preparation (for 32 g anhydrous product) Seed Gel (1) [19.95 g water + 4.07 g sodium hydroxide + 2.09 g sodium aluminate], stir in 50 mL plastic bottle until dissolved (2) ((1) + 22.72 g sodium silicate solution], stir moderately for at least 10 minutes; after stirring, cap the bottle and let the solution age at room temperature for 1 dayd Feedstock Gele (3) [130.97 g water + 0.14 g sodium hydroxide + 13.09 g sodium aluminate], stir in a 500 mL plastic beaker until dissolved (4) [(3) 142.43 g sodium silicate solution], stir vigorously with a high-shear turbine mixerf until the gel appears somewhat smooth; cover the beaker until the addition of the seed gel Overall Gel (5) [(4) + 16.50 g of (2)], slowly add seed gel (2) to feedstock gel (4) under high shear;f move the beaker during mixing to ensure the entire gel volume encounters the high shear from the turbine (up to 20 minutes)g Crystallization Vessel: 300 mL polypropylene bottle (sealed) Incubation: One day at room temperature g Temperature: 1000C g Time: After about 5 h, the gel will separate into a solid (containing the NaY Zeolite) that will settle to the bottom, and a hazy supernatant liquid. Continue heating until the supernatant is clear indicating complete crystallization (no more than 2 additional hours)g Product Recovery (1) Centrifuge; decant supernatant (2) Filter the wet solid product; wash with distilled water until pH of filtrate is below 9 (3) Dry at ll0¡C (4) Yield: approximately 32 g of anhydrous NaY (about 98% on Al2O3) Product Characterization XRD FAU; characteristic strong reflections at d = 14.28, 8.75 and 7.46 Å, a0 = 24.72 Å. Competing phases (if present): GIS, GME, CHA Elemental Analysis; NaAlO2. 2.43 SiO2 Crystal Size and Habit: octahedral crystals, <1 um Click here to view XRD pattern References [1] D. M. Ginter, A. T. Bell, C. J. Radke, in Synthesis of Microporous Materials, Vol. 1, Molecular Sieves, M. L Occelli, H. E Robson (eds.), Van Nostrand Reinhold, New York, 1992, p 6 [2] T. Linder, C. Kurtz, personal communications Notes a. This procedure is reliable only for the production of submicron NaY crystals and is limited in the range of sizes and compositions that can be produced using slight procedural modifications. b. Also available as solutions with this Na/Al ratio from Alcoa and U. S. Aluminate. c. It should be clear of precipitated material. d. Solution is clear when prepared; during aging, a loose gel forms which contains the NaY seeds. e. May be prepared concurrently with the seed gel or just prior to mixing the overall gel. f. 1600 rpm with 2.5 inch diameter, 4 paddle radial mixer (minimum) recommended. g. If a GIS (NaP) impurity is produced, it can be eliminated by reducing the Na aluminate in (1) to 1.40 g and aging the seed gel for 1 to 5 days prior to blending it into the feedstock. Further aging of the composite is optional with this seed, and pure product has been obtained after crystallization at 900C for 22 hours [2] |
2楼2008-05-31 21:12:50
zyhou
专家顾问 (文坛精英)
-
专家经验: +3748 - C-EPI: 74
- 应助: 4970 (副教授)
- 贵宾: 2.947
- 金币: 39411.7
- 散金: 14624
- 红花: 415
- 帖子: 10637
- 在线: 2546.4小时
- 虫号: 373328
- 注册: 2007-05-16
- 性别: GG
- 专业: 催化化学
- 管辖: 催化
4楼2008-06-01 07:52:07
120