共查询到19条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
5.
微波技术在分子筛领域的应用进展 总被引:2,自引:0,他引:2
本文综述了微波技术在分子筛研究领域中的应用,由于采用微波技术能够有效地促进反应分子间的相互作用,显著缩短化学反应的时间,降低能耗,因此微波技术在分子筛合成,分子筛膜制备以及分子筛改性等方面具有乐观的应用前景。 相似文献
6.
7.
8.
9.
10.
11.
12.
13.
14.
以酸性沸石作为催化剂进行了葡萄糖与醇的苷化反应 ,反应过程中同时生成烷基呋喃型葡萄糖苷和吡喃糖苷。氢型β -沸石等具有三维孔道结构的沸石催化剂用于苷化反应可以得到 95 %左右的苷化收率 ,对烷基呋喃型葡萄糖苷和吡喃糖苷总选择性可达 98%左右 相似文献
15.
16.
17.
The effects of temperature and microwave frequency on the dielectric properties of MoS2 and Pt catalysts together with an aluminum oxide support were investigated. Dielectric constants and dielectric loss factors were measured in a temperature range of 200-800 °C by a cavity resonator technique with a cylindrical copper cavity resonating in TM0n0 modes (n = 1, 2, ... ,5), which corresponded to frequencies of 0.615, 1.413, 2.216, 3.020, and 3.825 GHz. 相似文献
18.
A. Nilgün Akin Z. lsen
nsan 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1997,69(3):337-344
Studies have been conducted on the effect of preparation variables on the activity of coprecipitated cobalt–alumina catalysts to be used for the production of C1–C4 hydrocarbons by CO hydrogenation. The preparation parameters considered were the precipitation pH, the precipitation agent, the metal loading, the reduction temperature and the reduction period. It was found that changing pH precipitation with a constant final pH between 11·0 and 12·5 and the use of NaOH together with nitrates as precursors yielded better catalysts with maximal metal surface area. The optimum cobalt loading for the selective production of C1–C4 hydrocarbons is around 35 wt%. Optimum activity and selectivity are obtained by applying an 8-h reduction scheme at 648 K under 100 cm3 min−1 hydrogen. Calcination prior to reduction has a detrimental effect on metal surface area and hence on catalytic activity. © 1997 SCI. 相似文献
19.
活性氧化铝制备及改性 总被引:1,自引:0,他引:1
氧化铝催化剂载体领域中,γ-Al2O3应用最为广泛。文章综述了γ-Al2O3载体的应用、制备工艺,并总结了制备方法的改善,添加助剂和选择合适的前驱体的方法,对活性氧化铝进行改性,开发出大比表面积、适宜孔径分布及热稳定性良好的γ-Al2O3载体的研究成果。 相似文献